Patent Publication Number: US-6987949-B2

Title: Wireless microphone system, voice receiving apparatus, and wireless microphone

Description:
BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     The present invention relates to a wireless microphone system, a voice receiving apparatus, and a wireless microphone, and more particularly to, a multi-channel wireless microphone system comprising a voice receiving apparatus and a plurality of wireless microphones in a local communication area wherein the voice receiving apparatus is capable of communicating with each of the wireless microphones located in the local communication area without interfering with any one of them to ensure reliable communications. 
     2. Description of the Related Art 
     Up until now, there have been proposed a wide variety of wireless microphone systems, each comprising a wireless microphone for collecting a voice and converting the voice thus collected into an audio signal to be transmitted by means of radio wave, and a voice receiving apparatus for receiving the audio signal from the microphone, thereby making it possible for the voice receiving apparatus to receive the audio signal from the wireless microphone and eliminating the need of installing a cable for connecting the wireless microphone and the voice receiving apparatus. The voice receiving apparatus may be connected with, for example, a speaker for amplifying and outputting therethrough the voice thus collected and transmitted by the wireless microphone. 
     One typical example of the conventional wireless microphone system, hereinlater referred to as “first conventional wireless microphone system”, is exemplified and shown in  FIG. 14  as comprising two wireless microphones  901  and  903  each for collecting a voice, converting the voice thus collected into an audio signal, and transmitting the audio signal by means of radio wave on a microphone frequency channel, and two receiving apparatuses  902  and  904  each for receiving the audio signal. The voice receiving apparatus  902  is capable of receiving an audio signal by means of radio wave on a receiving frequency channel from a wireless microphone located within a local communication area L 1  while, on the other hand, the voice receiving apparatus  904  is capable of receiving the audio signal by means of radio wave on a receiving frequency channel from a wireless microphone located within a local communication area L 2 . The wireless microphone  901  is located in the local communication area L 1 , and the wireless microphone  903  is located in both the local communications areas L 1  and L 2 . 
     In the first conventional wireless microphone system thus constructed, the microphone frequency channel of the wireless microphone  901  located in the local communication area L 1  and the receiving frequency channel of the receiving apparatus  902  may be manually set to a common frequency channel, for example, frequency channel α, so that the wireless microphone  901  could communicate with the receiving apparatus  902 . Similarly, the microphone frequency channel of the wireless microphone  903  located in the local communication area L 2  and the receiving frequency channel of the receiving apparatus  904  may be manually set to a common frequency channel, for example, frequency channel β, so that the wireless microphone  903  could communicate with the receiving apparatus  904 . 
     The first conventional wireless microphone system, however, encounters a problem that the wireless microphone  903  located in both the local communication areas L 1  and L 2  cannot communicate with the receiving apparatus  902  while, on the other hand, the wireless microphone  903  can communicate with the receiving apparatus  904  on the frequency channel β unless the microphone frequency channel of the wireless microphone  903  and the receiving frequency channel of the receiving apparatus  902  are manually set to a common frequency channel. The radio wave transmitted by the wireless microphone  903  located in both the local communication areas L 1  and L 2  and communicating with the receiving apparatus  904  may be recognized by the receiving apparatus  902  as extraneous radio wave and cause a harmful interference with the receiving apparatus  902 . 
     Another conventional wireless microphone system, hereinlater referred to as “second conventional wireless microphone system”, is exemplified and shown in  FIG. 15  as comprising a plurality of wireless microphones, for example, wireless microphones  911  to  918  each for collecting a voice, converting the voice thus collected into an audio signal, and transmitting the audio signal by means of radio wave on a microphone frequency channel and a receiving apparatus  900  for receiving the audio signal. The wireless microphones  911  to  918  are located in a local communication area L 3 , and the voice receiving apparatus  900  is capable of receiving an audio signal by means of radio wave on a receiving frequency channel from a wireless microphone located within the local communication area L 3 . 
     In the second conventional wireless microphone system thus constructed, the microphone frequency channel of the wireless microphone  911  and the receiving frequency channel of the receiving apparatus  900  may be manually set to a common frequency channel, for example, frequency channel α 1 , so that the wireless microphone  911  can communicate with the receiving apparatus  900 . Similarly, the microphone frequency channel of the wireless microphone  912  and the receiving frequency channel of the receiving apparatus  900  may be manually set to a common frequency channel, for example, frequency channel α 2 , so that the wireless microphone  912  can communicate with the receiving apparatus  900 . In this manner, the microphone frequency channels of the wireless microphones  911  to  918  and the receiving frequency channels of the receiving apparatus  900  may be manually set to respective common frequency channels, for example, frequency channels α 1  to α 8  so that the plurality of wireless microphone  911  to  918  can communicate with the receiving apparatus  900 . 
     The second conventional wireless microphone system comprising a receiving apparatus and a plurality of wireless microphone encounters another problem that the microphone frequency channels of the wireless microphones  911  to  918  and the receiving frequency channels of the receiving apparatus  900  are required to be manually set to common frequency channels, i.e., respective frequency channels α 1  to α 8  so that the plurality of wireless microphone  911  to  918  can communicate with the receiving apparatus  900 , thereby making it difficult to manage a plurality of wireless microphones in terms of frequency channels and easily causing harmful interferences with one another. The present invention contemplates resolution of such problems. 
     SUMMARY OF THE INVENTION 
     It is therefore an object of the present invention to provide a wireless microphone system comprising a voice receiving apparatus and a plurality of wireless microphones located in a local communication area wherein the voice receiving apparatus is capable of communicating with each of the wireless microphones located in the local communication area, which makes it easy to set the receiving frequency channel of the voice receiving apparatus to frequency channels common to the microphone frequency channels of the wireless microphones so that a plurality of wireless microphones could communicate with the voice receiving apparatus to ensure reliable communications, thereby enabling to manage a plurality of wireless microphones in terms of frequency channels and preventing harmful interferences from occurring. 
     It is another object of the present invention to provide a voice receiving apparatus capable of communicating with a plurality of wireless microphones located in a local communication area, which makes it easy to set the receiving frequency channel of the voice receiving apparatus to frequency channels common to the microphone frequency channels of the wireless microphones so that a plurality of wireless microphones could communicate with the voice receiving apparatus to ensure reliable communications, thereby enabling to manage a plurality of wireless microphones in terms of frequency channels and preventing harmful interferences from occurring. 
     It is a further object of the present invention to provide a wireless microphone capable of communicating with a voice receiving apparatus, which makes it easy to set the receiving frequency channel of the voice receiving apparatus to frequency channels common to the microphone frequency channels of the wireless microphones to ensure reliable communications, thereby preventing harmful interferences from occurring. 
     In accordance with a first aspect of the present invention, there is provided a wireless microphone system comprising: a plurality of wireless microphones each having a global identification element, each of the wireless microphones operative to collect a voice, convert the voice thus collected into an audio signal, and transmit the audio signal and the global identification element; and a voice receiving apparatus for receiving the audio signal and the global identification element from a wireless microphone. The voice receiving apparatus may include a global identification element registering section for registering the global identification element received from a wireless microphone, and a local identification element assigning section for assigning a local identification element to the wireless microphone in accordance with the global identification element. The wireless microphone may receive the local identification element from the voice receiving apparatus and communicate with the voice receiving apparatus with the local identification thus received. 
     In the aforesaid wireless microphone system, the local identification element assigning section may receive the global identification element from a wireless microphone and transmit the local identification element to the wireless microphone by means of infrared communication. Alternatively, the local identification element assigning section may receive the global identification element from a wireless microphone and transmit the local identification element to the wireless microphone by means of radio wave communication on a particular frequency. 
     In accordance with a second aspect of the present invention, there is provided a wireless microphone system comprising: a plurality of wireless microphones each having a microphone storage area having a unique global identification element stored therein, each of the wireless microphones operative to collect a voice, convert the voice thus collected into an audio signal, and transmit the audio signal and the global identification element; and a voice receiving apparatus for receiving the audio signal and the global identification element from a wireless microphone. The voice receiving apparatus may include a storage section for storing an identification table including a plurality of local identification elements in association with a plurality of global identification elements. The voice receiving apparatus may assign a local identification element to the wireless microphone in accordance with the global identification element with reference to the identification table stored in the storage section, and transmit the local identification element to the wireless microphone. The wireless microphone may receive the local identification element, store the local identification element in the microphone storage area, and communicate with the voice receiving apparatus with the local identification element thus stored. 
     In the aforesaid wireless microphone system, the wireless microphone may be removably attached to the voice receiving apparatus, and operative to transmit the global identification element directly to the voice receiving apparatus. The voice receiving apparatus may receive the global identification element from the wireless microphone, assign a local identification element to the wireless microphone in accordance with the global identification element with reference to the identification table stored in the storage section, and transmit the local identification element to the wireless microphone while the wireless microphone is removably attached to the voice receiving apparatus. The wireless microphone may receive the local identification element, store the local identification element in the microphone storage area, and communicate with the voice receiving apparatus with the local identification element thus stored. Alternatively, the wireless microphone may be removably connected with the voice receiving apparatus through a cable and operative to transmit the global identification element through the cable to the voice receiving apparatus. The voice receiving apparatus may receive the global identification element from the wireless microphone, assign a local identification element to the wireless microphone in accordance with the global identification element with reference to the identification table stored in the storage section, and transmit the local identification element to the wireless microphone through the cable. The wireless microphone may receive the local identification element, store the local identification element in the microphone storage area, and communicate with the voice receiving apparatus with the local identification element thus stored. 
     In the aforesaid wireless microphone system, the wireless microphone may be capable of communicating with the voice receiving apparatus by means of infrared communication, and operative to transmit the global identification element by means of infrared communication to the voice receiving apparatus. The voice receiving apparatus may receive the global identification element from the wireless microphone, assign a local identification element to the wireless microphone in accordance with the global identification element with reference to the identification table stored in the storage section, and transmit the local identification element to the wireless microphone by means of infrared communication. The wireless microphone may receive the local identification element, store the local identification element in the microphone storage area, and communicate with the voice receiving apparatus with the local identification element thus stored. Alternatively, the wireless microphone may transmit the global identification element on a predetermined frequency channel. The voice receiving apparatus may assign a local identification element to the wireless microphone in accordance with the global identification element with reference to the identification table stored in the storage section, and transmit the local identification element to the wireless microphone on the predetermined frequency channel. The wireless microphone may receive the local identification element, store the local identification element in the microphone storage area, and communicate with the voice receiving apparatus with the local identification element thus stored. 
     In the aforesaid wireless microphone system, each of the local identification elements included in the identification table stored in the storage section may correspond to a communicating frequency channel which a wireless microphone assigned to the local identification element uses to communicates with the voice receiving apparatus. The wireless microphone may receive the local identification element, store the local identification element in the microphone storage area, and communicate with the voice receiving apparatus with the local identification element thus stored on the communicating frequency channel corresponding to the local identification element. The voice receiving apparatus may judge whether or not the global identification element is included in the identification table stored in the storage section before assigning a local identification element to the wireless microphone in accordance with the global identification element, and refuse the line connection with the wireless microphone if it is judged that the global identification element is not stored in the storage section. The voice receiving apparatus may be capable of communicating with the wireless microphone in a local communication area, the local identification element included in the identification table stored in the storage section includes area information indicative of the local communication area. The voice receiving apparatus may judge whether the local identification element is valid or not with reference to the area information included in the local identification element and refuse the line connection with the wireless microphone if it is judged that the local identification element is not valid. 
     In accordance with a third aspect of the present invention there is provided a voice receiving apparatus for receiving an audio signal and a global identification element from a wireless microphone comprising a storage section for storing an identification table including a plurality of local identification elements in association with a plurality of global identification elements. The voice receiving apparatus may assign a local identification element to the wireless microphone in accordance with the global identification element with reference to the identification table stored in the storage section, and transmit the local identification element to the wireless microphone. 
     In accordance with a fourth aspect of the present invention, there is provided a wireless microphone comprising a microphone storage area having a unique global identification element stored therein for collecting a voice, converting the voice thus collected into an audio signal, and transmitting the audio signal and the global identification element. The wireless microphone may receive the local identification element, store the local identification element in the microphone storage area, and communicate with the voice receiving apparatus with the local identification element thus stored. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The present invention and many of the advantages thereof will be better understood from the following detailed description when considered in connection with the accompanying drawings, wherein: 
         FIG. 1  is a schematic block diagram of a preferred first embodiment of the wireless microphone system according to the present invention; 
         FIG. 2  is a block diagram of an identification table forming part of the wireless microphone system shown in  FIG. 1 ; 
         FIG. 3  is a flow chart showing a process performed in the wireless microphone system shown in  FIG. 1 ; 
         FIG. 4  is a block diagram of a wireless microphone and a voice receiving apparatus forming part of a second preferred embodiment of the wireless microphone system according to the present invention; 
         FIG. 5  is a flow chart showing a process performed in the wireless microphone system shown in  FIG. 4 ; 
         FIG. 6  is a block diagram of a wireless microphone and a voice receiving apparatus forming part of a third preferred embodiment of the wireless microphone system according to the present invention; 
         FIG. 7  is a flow chart showing a process performed in the wireless microphone system shown in  FIG. 6 ; 
         FIG. 8  is a block diagram of a wireless microphone and a voice receiving apparatus forming part of a fourth preferred embodiment of the wireless microphone system according to the present invention; 
         FIG. 9  is a flow chart showing a process performed in the wireless microphone system shown in  FIG. 8 ; 
         FIG. 10  is a block diagram of a wireless microphone and a voice receiving apparatus forming part of a fifth preferred embodiment of the wireless microphone system according to the present invention; 
         FIG. 11  is a flow chart showing a process performed in the wireless microphone system shown in  FIG. 10 ; 
         FIG. 12  is a schematic block diagram of sixth preferred embodiment of the wireless microphone systems according to the present invention; 
         FIG. 13  is a block diagram explaining the structure of a local identification element forming part of the wireless microphone system shown in  FIG. 12 ; 
         FIG. 14  is a schematic block diagram of a first conventional wireless microphone system; and 
         FIG. 15  is a schematic block diagram of a second conventional wireless microphone system. 
     
    
    
     DESCRIPTION OF THE PREFERRED EMBODIMENTS 
     The preferred embodiments of the wireless microphone system according to the present invention will be described hereinafter with reference to the drawings shown in  FIGS. 1 to 13 . Throughout the following detailed description, similar reference characters refer to similar elements in all figures of the drawings. 
     Referring now to  FIGS. 1 to 3  of the drawings, there is shown a first preferred embodiment of the wireless microphone system  1000  according to the present invention. 
     The first preferred embodiment of the wireless microphone system  1000  is shown in  FIG. 1  as comprising a plurality of wireless microphones, for example, wireless microphones  11  to  18  and a voice receiving apparatus  100 . Each of the wireless microphones  11  to  18  has a global identification element and adapted to collect a voice, convert the voice thus collected into an audio signal, and transmit the audio signal and the global identification element. The voice receiving apparatus  100  is adapted to receive the audio signal and the global identification element from any one of the wireless microphones  11  to  18 . 
     The voice receiving apparatus  100  includes a global identification element registering section for registering a global identification element received from a wireless microphone  1 - i , and a local identification element assigning section for assigning a local identification element to the wireless microphone  1 - i  in accordance with the global identification element, and the wireless microphone  1 - i  is operative to receive the local identification element from the voice receiving apparatus  100  and communicate with the voice receiving apparatus  100  with the local identification element thus received. The term “wireless microphone  1 - i ” herein used is intended to mean any one of the wireless microphones  11  to  18 . 
     More specifically, each of the wireless microphones  11  to  18  has a microphone storage area having a unique global identification element stored therein, and adapted to collect a voice and convert the voice thus collected into an audio signal, and transmit the audio signal and the global identification element. The voice receiving apparatus  100  includes a storage section  101  for storing an identification table including a plurality of local identification elements in association with a plurality of global identification elements. Preferably, the identification table may include a plurality of local identification elements, for example, local ID: a to local ID: n, in association with a plurality of global identification elements, for example, global ID: A to global ID: N as shown in  FIG. 2 . Each of the local identification elements corresponds to a communicating frequency channel which a wireless microphone  1 - i  assigned to the local identification element uses to communicates with the voice receiving apparatus  100 . The global identification element may be a unique identifier such as, for example, a production number. The voice receiving apparatus  100  is capable of communicating with wireless microphones located in a local communication area L 1  with an antenna  102 . The local identification element may be an identifier uniquely valid in the local communication area L 1  of the voice receiving apparatus  100 . 
     This means that the voice receiving apparatus  100  is operative to store a plurality of global identification elements in association with a plurality of local identification elements in the storage section  101 . The process of storing a plurality of global identification elements in association with a plurality of local identification elements in the storage section  101  may be simply referred to as “registration of global identification elements”. The global identification element registering section is operative to store a plurality of global identification elements in association with a plurality of local identification elements in the storage section  101 . The storage section  101  partly constitutes the global identification element registering section according to the present invention. 
     The voice receiving apparatus  100  is operative to assign a local identification element to the wireless microphone  1 - i  in accordance with the global identification element with reference to the identification table stored in the storage section  101 , and transmit the local identification element to the wireless microphone  1 - i . The process of assigning a local identification element to the wireless microphone  1 - i  in accordance with the global identification element with reference to the identification table stored in the storage section  101 , and transmitting the local identification element to the wireless microphone  1 - i  may be simply referred to as “registration of a local identification element” performed in the voice receiving apparatus  100 . More specifically, the voice receiving apparatus  100  is operative to judge whether or not the global identification element is included in the identification table stored in the storage section  101  before assigning a local identification element to the wireless microphone  1 - i  in accordance with the global identification element. The voice receiving apparatus  100  is operative to refuse the line connection with the wireless microphone  1 - i  if it is judged that the global identification element is not stored in the storage section  101 . The global identification element included in the identification table stored in the storage section  101  may be simply referred to as “a registered global identification element”. The local identification element assigning section of the voice receiving apparatus  100  is operative to receive the global identification element from the wireless microphone  1 - i , assign a local identification element to the wireless microphone  1 - i  in accordance with the global identification element with reference to the identification table stored in the storage section  101 , and transmit the local identification element to the wireless microphone  1 - i . The storage section  101  partly constitutes the local identification element assigning section according to the present invention. 
     The wireless microphone  1 - i  is operative to receive the local identification element, store the local identification element in the microphone storage area, and communicate with the voice receiving apparatus  100  with the local identification element thus stored on the communicating frequency channel corresponding to the local identification element. The process of transmitting a global identification element to the voice receiving apparatus  100 , receiving a local identification element, and storing the local identification element in the microphone storage area may be simply referred to as “registration of a local identification element” performed in the wireless microphone  1 - i.    
     The operation of the first embodiment of the wireless microphone system  1000  according to the present invention will be described with reference to the drawings shown in  FIG. 3 , hereinlater. 
     It is assumed that a wireless microphone, for example, wireless microphone  11 , located in the local communication area L 1 , is operated to transmit a signal and the voice receiving apparatus  100  is operated to receive the signal from the wireless microphone  11  when, for example, the wireless microphone  11  is turned on or enters into the local communication area L 1 , or the voice receiving apparatus  100  is turned on. 
     In the step S 11 , the voice receiving apparatus  100  is operated to send request for a global identification element, hereinlater simply referred to as “global ID”. The step S 11  goes forward to the step S 12 , in which the wireless microphone  11  is operated to receive the request for a global ID and refer to own global ID, for example, global ID: A stored in the microphone storage area. The step S 12  goes forward to the step S 13 , in which the wireless microphone  12  is operated to send the global ID: A. 
     The step S 13  goes forward to the step S 14 , in which the voice receiving apparatus  100  is operated to receive the global ID: A from the wireless microphone  11 , and refer to the identification table stored in the storage section  101 . The step S 14  goes forward to the step S 15 , in which the voice receiving apparatus  100  is operated to judge whether the global ID: A is included in the identification table stored in the storage section  101  or not, i.e., whether the global ID: A is a registered global ID or not. If it is judged that the global ID: A is not included in the identification table stored in the storage section  101 , i.e., not a registered global ID, the step S 15  goes forward to the step S 18 , in which the line connection with the wireless microphone  11  is refused. Otherwise, the step S 15  goes forward to the step S 16 , in which the line connection with the wireless microphone  11  is permitted, the voice receiving apparatus  100  is operated to assign a local identification element, hereinlater simply referred to as “local ID”, for example, local ID: a to the wireless microphone  11  in accordance with the global ID: A with reference to the identification table stored in the storage section  101 , and issue a local ID: a to the wireless microphone  11 . The step S 16  goes forward to the step S 17 , in which the wireless microphone  11  is operated to receive the local ID: a, and write the local ID: a into the wireless microphone storage area. The wireless microphone  11  is then operated to communicate with the voice receiving apparatus  100  with the local identification element, i.e., local ID: a thus stored in the wireless microphone storage area on the communicating frequency channel corresponding to the local identification element. 
     In the first embodiment of the wireless microphone system  1000  thus constructed, the receiving frequency channel of the voice receiving apparatus  100  can be automatically set to a frequency channel common to the microphone frequency channel of the wireless microphone  1 - i  located in the local communication area L 1 , thereby making it easy for the wireless microphones  1 - i  to communicate with the voice receiving apparatus  100 . 
     In the first embodiment of the wireless microphone system  1000  according to the present invention, a wireless microphone  20  located in, for example, both the local communication areas  1  and  3 , and communicating with voice receiving apparatus, not shown, capable of communicating with a wireless microphone located in the local communication area  3  (see  FIG. 1 ), cannot communicate with the voice receiving apparatus  100  unless the global identification element of wireless microphone  20  is registered with the voice receiving apparatus  100  and has received a local identification element, i.e., a local ID from the voice receiving apparatus  100  because of the fact that the voice receiving apparatus  100  is operated to judge that the global identification element, i.e., the global ID of the wireless microphone is not a registered global ID in the step S 15 , and the line connection with the wireless microphone  20  is refused in the step S 18 , thereby preventing the radio wave transmitted by the wireless microphone  20  from being recognized by the voice receiving apparatus  100  as extraneous radio wave and causing a harmful interference with the voice receiving apparatus  100 . 
     The first embodiment of the wireless microphone system  1000  according to the present invention, comprising a plurality of wireless microphones  11  to  18  and a voice receiving apparatus  100  including a global identification element registering section for registering the global identification element received from a wireless microphone  1 - i , and a local identification element assigning section for assigning a local identification element to the wireless microphone  1 - i  in accordance with the global identification element, and the wireless microphone  1 - i  is operative to receive the local identification element from the voice receiving apparatus  100  and communicate with the voice receiving apparatus  100  with the local identification element thus received, is simple in construction but makes it possible for a plurality of wireless microphones to automatically register with the voice receiving apparatus  100 , thereby preventing the radio wave transmitted by other entities such as for example, digital wireless microphones and analog wireless microphones communicating with other voice receiving apparatus, and radio communication systems from being recognized by the voice receiving apparatus  100  as extraneous radio wave and causing a harmful interference with the voice receiving apparatus  100 . 
     Referring then to  FIGS. 4 and 5  of the drawings, there is shown a second preferred embodiment of the wireless microphone system  2000  according to the present invention. 
     The second preferred embodiment of the wireless microphone system  2000  shown in  FIG. 4  is similar to the first embodiment of the wireless microphone system  1000  except for the fact that the voice receiving apparatus  100  constituting the second embodiment of the wireless microphone system  2000  includes an attaching device  103  for removably attaching a wireless microphone to the voice receiving apparatus  100 . 
     The constitution elements of the second embodiment of the wireless microphone system  2000  entirely the same as those of the first embodiment of the wireless microphone system  1000  will not be described but bear the same reference numerals and legends as those of the first embodiment of the wireless microphone system  1000  in  FIG. 1  to avoid tedious repetition. 
     The wireless microphone  1 - i  is removably attached to the voice receiving apparatus  100 , and operative to transmit the global identification element directly to the voice receiving apparatus  100 . The voice receiving apparatus  100  is operative to receive the global identification element from the wireless microphone  1 - i , assign a local identification element to the wireless microphone  1 - i  in accordance with the global identification element with reference to the identification table stored in the storage section  101 , and transmit the local identification element to the wireless microphone  1 - i  while the wireless microphone  1 - i  is removably attached to the voice receiving apparatus  100 . The wireless microphone  1 - i  is operative to receive the local identification element, store the local identification element in the microphone storage area, and communicate with the voice receiving apparatus  100  with the local identification element thus stored on the communicating frequency channel corresponding to the local identification element. It is needless to mention that the wireless microphone  1 - i  is capable of communicating with the voice receiving apparatus  100  with the local identification element on the communicating frequency channel corresponding to the local identification element after removed from the voice receiving apparatus  100 . The term “wireless microphone  1 - i ” herein used is intended to mean any one of the wireless microphones  11  to  18 . 
     The operation of the second embodiment of the wireless microphone system  2000  according to the present invention will be described with reference to the drawings shown in  FIG. 5 . 
     It is assumed that a wireless microphone, for example, wireless microphone  11 , removably attached to the voice receiving apparatus  100  by the attaching device  103 , is operated to transmit a global identification element and the voice receiving apparatus  100  is operated to receive the global identification element from the wireless microphone  11 . 
     In the step S 21 , the wireless microphone  11  is removably attached to the voice receiving apparatus  100  by the attaching device  103 , for example, a microphone attachment. The step S 21  goes forward to the step S 22 , in which the voice receiving apparatus  11  is operated to confirm that the wireless microphone  11  is attached thereto. The step S 22  goes forward to the step S 23 , in which the voice receiving apparatus  100  is operated to send request for a global identification element, hereinlater simply referred to as “global ID”. The step S 23  goes forward to the step S 24 , in which the wireless microphone  11  is operated to receive the request for a global ID and refer to own global ID, for example, global ID: A stored in the microphone storage area. The step S 24  goes forward to the step S 25 , in which the wireless microphone  12  is operated to send the global ID: A. 
     The step S 25  goes forward to the step S 26 , in which the voice receiving apparatus  100  is operated to receive the global ID: A from the wireless microphone  11 , refer to the identification table stored in the storage section  101 , and register the global ID. The step S 26  goes forward to the step S 27 , in which the voice receiving apparatus  100  is operated to assign a local identification element, for example, a local ID: a assigned to the wireless microphone  11  according to the global ID: A with reference to the identification table stored in the storage section  101 , and issue the local ID: a to the wireless microphone  11 . The registration of global identification element and the registration of local identification performed in the voice receiving apparatus  100  are completed. The step S 27  goes forward to the step S 28 , in which the wireless microphone  11  is operated to receive the local ID: a, and write the local ID: a into the wireless microphone storage area. Then, registration of global identification element and the registration of local identification performed in the wireless microphone  11  are completed. Then, the wireless microphone  1 - i  is capable of communicating with the voice receiving apparatus  100  with the local identification element on the communicating frequency channel corresponding to the local identification element after removed from the voice receiving apparatus  100 . 
     The second embodiment of the wireless microphone system  2000  thus constructed makes it easy for the wireless microphone  11  just removably attached to the voice receiving apparatus  100  by the attaching device  103  to automatically register the global identification element, i.e., global ID with the voice receiving apparatus  100  and receive the local identification element, i.e., local ID from the voice receiving apparatus  100  without making any manual efforts such as, for example, inputting numbers. 
     The second embodiment of the wireless microphone system  2000  according to the present invention, makes it possible for a plurality of wireless microphones to automatically register with the voice receiving apparatus  100 , thereby preventing the radio wave transmitted by other entities such as for example, digital wireless microphones and analog wireless microphones communicating with other voice receiving apparatus, and radio communication systems from being recognized by the voice receiving apparatus  100  as extraneous radio wave and causing a harmful interference with the voice receiving apparatus  100 . 
     Referring to  FIGS. 6 and 7  of the drawings, there is shown a third preferred embodiment of the wireless microphone system  3000  according to the present invention. 
     The third preferred embodiment of the wireless microphone system  3000  shown in  FIG. 6  is similar to the first embodiment of the wireless microphone system  1000  except for the fact that the voice receiving apparatus  100  includes a connecting port  104 , and wireless microphone  1 - i  is removably connected with the voice receiving apparatus  100  through a cable C connected to the connecting port  104 . 
     The constitution elements of the third embodiment of the wireless microphone system  3000  entirely the same as those of the first embodiment of the wireless microphone system  1000  will not be described but bear the same reference numerals and legends as those of the first embodiment of the wireless microphone system  1000  in  FIG. 1  to avoid tedious repetition. The wireless microphone  1 - i  is removably connected with the voice receiving apparatus  100  through a cable C and operative to transmit the global identification element through the cable C to the voice receiving apparatus  100 . The voice receiving apparatus  100  is operative to receive the global identification element from the wireless microphone  1 - i , assign a local identification element to the wireless microphone  1 - i  in accordance with the global identification element with reference to the identification table stored in the storage section  101 , and transmit the local identification element to the wireless microphone  1 - i  through the cable C while the wireless microphone  1 - i  is removably connected with the voice receiving apparatus  100  through the cable C. The wireless microphone  1 - i  is operative to receive the local identification element, store the local identification element in the microphone storage area, and communicate with the voice receiving apparatus  100  with the local identification element thus stored on the communicating frequency channel corresponding to the local identification element. It is needless to mention that the wireless microphone  1 - i  is capable of communicating with the voice receiving apparatus  100  with the local identification element on the communicating frequency channel corresponding to the local identification element after the cable C connecting the wireless microphone  1 - i  and the voice receiving apparatus  100  is removed. 
     The operation of the third embodiment of the wireless microphone system  3000  according to the present invention will be described with reference to the drawings shown in  FIG. 7 . 
     It is assumed that a wireless microphone, for example, wireless microphone  11 , removably connected with the voice receiving apparatus  100  through a cable C connected to the connecting port  104  of the voice receiving apparatus  100 , is operated to transmit a global identification element and the voice receiving apparatus  100  is operated to receive the global identification element from the wireless microphone  11 . 
     In the step S 31 , the wireless microphone  11  is removably connected with the voice receiving apparatus  100  using the cable C connected to the connecting port  104  of the voice receiving apparatus  100 , and operated to send request for registration. The step S 31  goes forward to the step S 32 , in which the voice receiving apparatus  11  is operated to receive and confirm the request for registration. The step S 32  goes forward to the step S 33 , in which the voice receiving apparatus  100  is operated to send request for a global identification element, hereinlater simply referred to as “global ID”. The step S 33  goes forward to the step S 34 , in which the wireless microphone  11  is operated to receive the request for a global ID and refer to own global ID, for example, global ID: A stored in the microphone storage area. The step S 34  goes forward to the step S 35 , in which the wireless microphone  12  is operated to send the global ID: A. 
     The step S 35  goes forward to the step S 36 , in which the voice receiving apparatus  100  is operated to receive the global ID: A from the wireless microphone  11 , refer to the identification table stored in the storage section  101 , and register the global ID. The step S 36  goes forward to the step S 37 , in which the voice receiving apparatus  100  is operated to assign a local identification element, for example, a local ID: a assigned to the wireless microphone  11  according to the global ID: A with reference to the identification table stored in the storage section  101 , and issue the local ID: a to the wireless microphone  11 . The step S 37  goes forward to the step S 38 , in which the wireless microphone  11  is operated to receive the local ID: a, and write the local ID: a into the wireless microphone storage area. Then the registration process is completed. 
     The third embodiment of the wireless microphone system  3000  thus constructed makes it possible for the wireless microphone  11  just removably connected to the voice receiving apparatus  100  through the cable C connected to the connecting port  104  of the voice receiving apparatus  100  to automatically register the global identification element, i.e., global ID with the voice receiving apparatus  100  and receive the local identification element, i.e., local ID from the voice receiving apparatus  100  without making any manual efforts such as, for example, inputting numbers. 
     Referring to  FIGS. 8 and 9  of the drawings, there is shown a fourth preferred embodiment of the wireless microphone system  4000  according to the present invention. 
     The fourth preferred embodiment of the wireless microphone system  4000  shown in  FIG. 8  is similar to the first embodiment of the wireless microphone system  1000  except for the fact that the voice receiving apparatus  100  includes an infrared communication port  105  for transmitting and receiving signals by means of infrared communication, and the wireless microphone  1 - i  is capable of communicating with the voice receiving apparatus  100  by means of infrared communication through the infrared communication port  105 . This means that the local identification element assigning section of the voice receiving apparatus  100  is operative to receive the global identification element from a wireless microphone  1 - i  and transmit the local identification element to the wireless microphone  1 - i  by means of infrared communication. The infrared communication port  105  partly constitutes the local identification element assigning section according to the present invention. 
     The constitution elements of the fourth embodiment of the wireless microphone system  4000  entirely the same as those of the first embodiment of the wireless microphone system  1000  will not be described but bear the same reference numerals and legends as those of the first embodiment of the wireless microphone system  1000  in  FIG. 1  to avoid tedious repetition. 
     The wireless microphone  1 - i  is capable of communicating with the voice receiving apparatus  100  by means of infrared communication through the infrared communication port  105 , and operative to transmit the global identification element by means of infrared communication to the voice receiving apparatus  100 . The voice receiving apparatus  100  is operative to receive the global identification element from the wireless microphone  1 - i , assign a local identification element to the wireless microphone  1 - i  in accordance with the global identification element with reference to the identification table stored in the storage section  101 , and transmit the local identification element to the wireless microphone  1 - i  by means of infrared communication through the infrared communication port  105 . The wireless microphone  1 - i  is operative to receive the local identification element, store the local identification element in the microphone storage area, and communicate with the voice receiving apparatus  100  with the local identification element thus stored on the communicating frequency channel corresponding to the local identification element. 
     The operation of the fourth embodiment of the wireless microphone system  4000  according to the present invention will be described with reference to the drawings shown in  FIG. 9 . 
     It is assumed that a wireless microphone, for example, wireless microphone  11 , attempts to communicate with the voice receiving apparatus  100 , and is operated to transmit a global identification element by means of infrared communication, and the voice receiving apparatus  100  is operated to receive the global identification element by means of infrared communication through the infrared communication port  105 . 
     In the step S 41 , the wireless microphone  11  is operated to communicate with the voice receiving apparatus  100  using the infrared port  105  of the voice receiving apparatus  100 , and send request for registration. The step S 41  goes forward to the step S 42 , in which the voice receiving apparatus  11  is operated to receive and confirm the request for registration. The step S 42  goes forward to the step S 43 , in which the voice receiving apparatus  100  is operated to send request for a global identification element, hereinlater simply referred to as “global ID”. The step S 43  goes forward to the step S 44 , in which the wireless microphone  11  is operated to receive the request for a global ID and refer to own global ID, for example, global ID: A stored in the microphone storage area. The step S 44  goes forward to the step S 45 , in which the wireless microphone  12  is operated to send the global ID: A. 
     The step S 45  goes forward to the step S 46 , in which the voice receiving apparatus  100  is operated to receive the global ID: A from the wireless microphone  11 , refer to the identification table stored in the storage section  101 , and register the global ID. The step S 46  goes forward to the step S 47 , in which the voice receiving apparatus  100  is operated to assign a local identification element, for example, a local ID: a assigned to the wireless microphone  11  according to the global ID: A with reference to the identification table stored in the storage section  101 , and issue the local ID: a to the wireless microphone  11 . The step S 47  goes forward to the step S 48 , in which the wireless microphone  11  is operated to receive the local ID: a, and write the local ID: a into the wireless microphone storage area. Then the registration process is completed. 
     The fourth embodiment of the wireless microphone system  4000  thus constructed makes it possible for the wireless microphone  1 - i  capable of communicating with the voice receiving apparatus  100  by means of infrared communication through the infrared communication port  105  to automatically register the global identification element, i.e., global ID with the voice receiving apparatus  100  and receive the local identification element, i.e., local ID from the voice receiving apparatus  100  without making any manual efforts such as, for example, inputting numbers. 
     Furthermore, the directivity of the infrared wave is higher than that of the radio wave. This means that the fourth embodiment of the wireless microphone system  4000 , in which the wireless microphone  1 - i  is capable of communicating with the voice receiving apparatus  100  by means of infrared communication, makes it possible for the wireless microphone  1 - i  to automatically register the global identification element and receive the local identification element by means of infrared waves, regardless of whether extraneous radio waves are transmitted or not. 
     Referring to  FIGS. 10 and 11  of the drawings, there is shown a fifth preferred embodiment of the wireless microphone system  5000  according to the present invention. 
     The fifth preferred embodiment of the wireless microphone system  5000  shown in  FIG. 10  is similar to the first embodiment of the wireless microphone system  1000  except for the fact that the wireless microphone  1 - i  is operative to transmit the global identification element on a predetermined frequency channel; and the voice receiving apparatus  100  is operative to assign a local identification element to the wireless microphone  1 - i  in accordance with the global identification element with reference to the identification table stored in the storage section  101 , and transmit the local identification element to the wireless microphone  1 - i  on the predetermined frequency channel. This means that the local identification element assigning section is operative to receive the global identification element from a wireless microphone  1 - i  and transmit the local identification element to the wireless microphone  1 - i  by means of radio wave communication on the particular frequency channel. 
     The constitution elements of the fifth embodiment of the wireless microphone system  5000  entirely the same as those of the first embodiment of the wireless microphone system  1000  will not be described but bear the same reference numerals and legends as those of the first embodiment of the wireless microphone system  1000  in  FIG. 1  to avoid tedious repetition. 
     The wireless microphone  1 - i  is operative to transmit the global identification element on a predetermined frequency channel, for example, a registration dedicated frequency channel. The voice receiving apparatus  100  is operative to assign a local identification element to the wireless microphone  1 - i  in accordance with the global identification element with reference to the identification table stored in the storage section  101 , and transmit the local identification element to the wireless microphone  1 - i  on the predetermined frequency channel, i.e., a registration dedicated frequency channel. The wireless microphone  1 - i  is operative to receive the local identification element, store the local identification element in the microphone storage area, and communicate with the voice receiving apparatus  100  with the local identification element thus stored on the communicating frequency channel corresponding to the local identification element. 
     The operation of the fifth embodiment of the wireless microphone system  5000  according to the present invention will be described with reference to the drawings shown in  FIG. 11 . 
     It is assumed that a wireless microphone, for example, wireless microphone  11 , attempts to communicate with the voice receiving apparatus  100 , and is operative to transmit the global identification element on a predetermined frequency channel, and the voice receiving apparatus  100  is operative to assign a local identification element to the wireless microphone  11  in accordance with the global identification element with reference to the identification table stored in the storage section  101 , and transmit the local identification element to the wireless microphone  11  on the predetermined frequency channel. 
     In the step S 51 , the wireless microphone  11  is operated to communicate with the voice receiving apparatus  100  on a predetermined frequency channel, hereinlater referred to as, “registration dedicated frequency channel”, and send request for registration. The step S 51  goes forward to the step S 52 , in which the voice receiving apparatus  11  is operated to receive and confirm the request for registration. The step S 52  goes forward to the step S 53 , in which the voice receiving apparatus  100  is operated to send request for a global identification element, hereinlater simply referred to as “global ID”. The step S 53  goes forward to the step S 54 , in which the wireless microphone  11  is operated to receive the request for a global ID and refer to own global ID, for example, global ID: A stored in the microphone storage area. The step S 54  goes forward to the step S 55 , in which the wireless microphone  12  is operated to send the global ID: A. 
     The step S 55  goes forward to the step S 56 , in which the voice receiving apparatus  100  is operated to receive the global ID: A from the wireless microphone  11 , refer to the identification table stored in the storage section  101 , and register the global ID. The step S 56  goes forward to the step S 57 , in which the voice receiving apparatus  100  is operated to assign a local identification element, for example, a local ID: a assigned to the wireless microphone  11  according to the global ID: A with reference to the identification table stored in the storage section  101 , and issue the local ID: a to the wireless microphone  11 . The step S 57  goes forward to the step S 58 , in which the wireless microphone  11  is operated to receive the local ID: a, and write the local ID: a into the wireless microphone storage area. Then the registration process is completed. 
     The fifth embodiment of the wireless microphone system  5000  thus constructed makes it possible for the wireless microphone  1 - i  capable of communicating with the voice receiving apparatus  100  on a predetermined frequency channel to automatically register the global identification element, i.e., global ID with the voice receiving apparatus  100  and receive the local identification element, i.e., local ID from the voice receiving apparatus  100  without making any manual efforts such as, for example, inputting numbers. 
     Furthermore, the fifth embodiment of the wireless microphone system  500  according to the present invention, in which the wireless microphone  1 - i  is operative to transmit the global identification element on a predetermined frequency channel; and the voice receiving apparatus  100  is operative to assign a local identification element to the wireless microphone  1 - i  in accordance with the global identification element with reference to the identification table stored in the storage section  101 , and transmit the local identification element to the wireless microphone  1 - i  on the predetermined frequency channel, makes it possible for the wireless microphone  1 - i  to automatically register the global identification element with the voice receiving apparatus  100  and receive the local identification element from the voice receiving apparatus  100  on a predetermined frequency channel, eliminating the need of installing additional devices such as, for example, a attaching device, and infrared communication devices, thereby reducing the cost of the wireless microphone system  5000 . 
     It is herein assumed that the above embodiments of the wireless microphone system comprises 8 units of wireless microphones, for example, wireless microphones  11  to  18  for simplicity and better understanding but it is of course needless to mention that the wireless microphone system according to the present invention may comprise any number of wireless microphones. 
     Referring to  FIG. 12 and 13  of the drawings, there are shown a plurality of sixth preferred embodiments of the wireless microphone system according to the present invention. 
     The sixth preferred embodiment of the wireless microphone system shown in  FIG. 12  is similar to the first embodiment of the wireless microphone system  1000  except for the fact that the voice receiving apparatus  100  is capable of communicating with a wireless microphone in a local communication area, and the local identification element included in the identification table stored in the storage section  101  includes area information indicative of the local communication area. 
     The constitution elements of the sixth embodiment of the wireless microphone system entirely the same as those of the first embodiment of the wireless microphone system will not be described but bear the same reference numerals and legends as those of the first embodiment of the wireless microphone system  1000  in  FIG. 1  to avoid tedious repetition. As best shown in  FIG. 12 , each of the wireless microphone systems comprises a voice receiving apparatus and a plurality of wireless microphones. The voice receiving apparatus  100 - 1  is capable of communicating with a wireless microphone  1 - i  located in a local communication area  1 . The local identification element included in the identification table stored in the storage section  101  includes area information indicative of the local communication area as shown in  FIG. 13 . The local identification element stored in the storage section  101  of the voice receiving apparatus  100 - 1  includes area information indicative of the local communication area  1 , for example, “01”. The voice receiving apparatus  100 - 2  is capable of communicating with a wireless microphone  2 - i  located in a local communication area  2 . The local identification element stored in the storage section  101  of the voice receiving apparatus  100 - 2  includes area information indicative of the local communication area  2 , for example, “02”. Similarly, the voice receiving apparatus  100 -N is capable of communicating with a wireless microphone N-i located in a local communication area N. The local identification element stored in the storage section  101  of the voice receiving apparatus  100 -N includes area information indicative of the local communication area N, for example, “N”. Upon receiving an audio signal with a local identification element, the voice receiving apparatus  100 -N is operative to judge whether the local identification element is valid or not with reference to the area information included in the local identification element and refuse the line connection with the wireless microphone if it is judged that the local identification element is not valid. 
     The operation of the sixth embodiment of the wireless microphone system will be described hereinlater with reference to the drawings shown in  FIG. 12 . 
     The voice receiving apparatus, for example, voice receiving apparatus  100 - 1  is operated to receive a local identification element from a wireless microphone, for example, wireless microphone  2 - i  communicating with a voice receiving apparatus  100 - 2 . The local identification element transmitted by the wireless microphone  2 - i  start from the area information “02” indicative of a local communication area  2 . The voice receiving apparatus  100 - 1  is operated to judge whether the local identification element is valid or not with reference to the area information “02” included in the local identification element. The voice receiving apparatus  100 - 1  is capable of communicating with a wireless microphone  1 - i  transmitting a local identification element starting from the area information “01” but not with a wireless microphone transmitting a local identification element starting from the area information “02”, which is other than “01”. The voice receiving apparatus  100 - 1  is operated to judge that the local identification element received from the wireless microphone  2 - i  is not valid and the line connection with the wireless microphone  2 - i  is refused. 
     The sixth embodiment of the wireless microphone system according to the present invention, in which the voice receiving apparatus capable of communicating with a wireless microphone in a local communication area judges whether a local identification element transmitted from a wireless microphone is valid in the local communication area or not with reference to the area information included in the local identification element, and refuse the line connection if it is judged that the local identification element is not valid, can prevent the radio wave transmitted by an alien wireless microphone, which is supposed to communicate with other voice receiving apparatus, from being recognized by the voice receiving apparatus  100  as extraneous radio wave and causing a harmful interference with the voice receiving apparatus  100 . 
     As will be seen from the foregoing description, it is to be understood that the wireless microphone system according to the present invention, comprising a voice receiving apparatus and a plurality of wireless microphones located in a local communication area wherein the voice receiving apparatus is capable of communicating with each of the wireless microphones located in the local communication area, makes it easy to set the receiving frequency channel of the voice receiving apparatus to frequency channels common to the microphone frequency channels of the wireless microphones so that a plurality of wireless microphones could communicate with the voice receiving apparatus to ensure reliable communications, thereby enabling to manage a plurality of wireless microphones in terms of frequency channels and preventing harmful interferences from occurring. 
     Furthermore, the voice receiving apparatus according to the present invention, capable of communicating with a plurality of wireless microphones located in a local communication area, makes it easy to set the receiving frequency channel of the voice receiving apparatus to frequency channels common to the microphone frequency channels of the wireless microphones so that a plurality of wireless microphones could communicate with the voice receiving apparatus to ensure reliable communications, thereby enabling to manage a plurality of wireless microphones in terms of frequency channels and preventing harmful interferences from occurring. 
     According to the present invention, the wireless microphone capable of communicating with a voice receiving apparatus, makes it easy to set the receiving frequency channel of the voice receiving apparatus to frequency channels common to the microphone frequency channels of the wireless microphones to ensure reliable communications, thereby preventing harmful interferences from occurring. 
     It will be apparent to those skilled in the art and it is contemplated that variations and/or changes in the embodiments illustrated and described herein may be without departure from the present invention. Accordingly, it is intended that the foregoing description is illustrative only, not limiting, and that the true spirit and scope of the present invention will be determined by the appended claims.