Abstract:
In one embodiment a communications system includes at least one wireless microphone and a wireless transmitter which is adapted to send data to each microphone after setting a common operating frequency and ID. A PC having a wireless communications module is provided in another embodiment. The PC is adapted to activate the transmitter to send data to each microphone through its communications module.

Description:
BACKGROUND OF THE INVENTION 
       [0001]    1. Field of Invention 
         [0002]    The invention relates to wireless communications system and more particularly to such a system comprising at least one wireless microphone, and a wireless transmitter which is adapted to send data to each microphone after setting a common operating frequency and ID. 
         [0003]    2. Description of Related Art 
         [0004]    Typically, electrical devices including microphones and stereos are connected to wall outlets in a room of a KTV center. One drawback is that wires may get tangled. 
         [0005]    Still typically, as an improvement of the above arrangement, the microphones are replaced with wireless ones. Also, one or more controllers are provided in which each controller is adapted to control two wireless microphones. Thus, for example, three controllers are required to control six wireless microphones. This inevitably will increase operating cost greatly. Thus, the need for improvement still exists. 
       SUMMARY OF THE INVENTION 
       [0006]    It is therefore one object of the invention to provide a communications system comprising at least one wireless microphone, and a wireless transmitter which is adapted to send data to each microphone after setting a common operating frequency and ID. 
         [0007]    The above and other objects, features and advantages of the invention will become apparent from the following detailed description taken with the accompanying drawings. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0008]      FIG. 1  is a block diagram of a first preferred embodiment of communications system according to the invention; and 
           [0009]      FIG. 2  is a block diagram of a second preferred embodiment of communications system according to the invention. 
       
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
       [0010]    Referring to  FIG. 1 , a communications system in accordance with a first preferred embodiment of the invention is shown. The system comprises a wireless microphone  1  and a wireless transmitter  2 . Each component is discussed in detailed below. 
         [0011]    The microphone  1  comprises a control panel  10 , a controller  11  on the control panel  10  for setting a channel, transmission power, and a transmission range, a codec (coder-decoder)  12  in the control panel  10 , a communications module  30  in the control panel  10 ; and an antenna (not numbered) extending out of the housing of the microphone  1 . 
         [0012]    Likewise, the transmitter  2  comprises a control panel  20 , a controller  21  on the control panel  20  for setting a channel, transmission power, and a transmission range, a codec  22  in the control panel  20 , a communications module  30  in the control panel  20 , and an antenna (not numbered) extending out of the housing of the transmitter  2 . 
         [0013]    Each communications module  30  includes circuitry and is complied with the specifications of IEEE 802.15.4. Also, the communications module  30  in the transmitter  2  is adapted to send data at a rate of at least 200 kbit/s over WPAN (wireless personal area network). 
         [0014]    Moreover, the controller  21  can set an operating frequency and an identification (ID) of each of the transmitter  2  and the microphone  1  such that data can be sent from the transmitter  2  to the microphone  1  as detailed later. 
         [0015]    For example, in an exemplary operation, data is first encoded with an ID by the codec  22  in which the ID is set by the controller  21 . Next, the encoded data is sent to the communications module  30 . Next, the communications module  30  sends the data to the antenna of the transmitter  2  which in turn sends radio waves containing the data to the antenna of the microphone  1  for receiving. The received data is then sent to the communications module  30  of the microphone  1 . The communications module  30  of the microphone  1  in turn sends same to the codec  12  for decoding. Next, the decoded data is sent to the controller  11  for processing. In detail, the controller  11  determines whether ID of the received data to be valid or not by comparing the ID of the received data with an ID of the controller  11  in which the ID of the controller  11  is also set by the transmitter  2 . The controller  11  then processes the received data accordingly if the comparison result is true. 
         [0016]    It is noted that a single transmitter  2  can control a plurality of microphones  1  wirelessly. Thus, operating cost is great reduced. Moreover, heat generated by the wireless transmitter  1  can be effectively dissipated. 
         [0017]    Referring to  FIG. 2 , a communications system in accordance with a second preferred embodiment of the invention is shown. The characteristics of the second preferred embodiment are detailed below. A PC  3  having a communications module  30  is provided. The communications module  30  is also complied with the specifications of IEEE 802.15.4. A user can run software in the PC  3  to operate the communications module  30  which in turn activates the data sending mechanism of the transmitter  2  described above. Moreover, a WPAN can be established by wirelessly connecting the wireless transmitter  2 , one or more wireless microphones  1 , the PC  3  together. 
         [0018]    Alternatively, the PC  3  can be replaced by a PDA (Personal Digital Assistant) in the other embodiments. 
         [0019]    Each embodiment can prevent two microphones from operating in the same operating frequency. Otherwise, interference can occur. 
         [0020]    In addition, a user can operate either the controller  21  of the transmitter  2  or the PC  3  to remotely locate and eliminate the source of trouble occurred in any microphone  1 . Further, either the controller  21  of the transmitter  2  or the PC  3  can reset the operating frequencies of the microphones  1  for maintaining quality of the microphones. 
         [0021]    While the invention herein disclosed has been described by means of specific embodiments, numerous modifications and variations could be made thereto by those skilled in the art without departing from the scope and spirit of the invention set forth in the claims.