Abstract:
A wireless air tube headset that includes a wireless transceiver operating in a radio frequency band, which wireless receives audio signals. The headset includes an acoustic chamber with an acoustic port through to the exterior thereof, and an acoustic transducer that is electrically coupled to the transceiver, and that operates to generate acoustic signals. The acoustic transducer is aligned with the acoustic chamber to emit the acoustic signals through the acoustic port. There is an acoustic isolator disposed to attenuate extraneous acoustic signals emitted from the acoustic transducer and also to attenuate ambient noise entry into the acoustic chamber. An acoustic conduit is formed from an electrically non-conductive material, and has a first opening engaged with the acoustic port and a second opening engaged with an acoustic coupler, which has a first earpiece engagement means. An earpiece is engaged to the first earpiece engagement means, and thereby forms an electrically non-conductive acoustic path from the acoustic transducer to the earpiece. The acoustic path has a length to enable displacement of the transceiver and the acoustic transducer from the earpiece at a distance sufficient to yield at least a six decibel radio signal propagation power loss at the radio frequency band.

Description:
BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     The present invention relates to head worn audio headsets. More particularly, the present invention relates to radio wireless headsets that employ an air tube acoustically coupled earpiece. 
     2. Description of the Related Art 
     Wireless earphones and headset are known. These include monaural and stereo listen-only headsets and headsets used in telephony and radiotelephony that include a microphone for enabling duplex communications. A common application for wireless headsets is use in conjunction with a cellular telephone. A cellular telephone is carried by a user, and is used for interconnection with a cellular telephone network. The cellular telephone additionally includes a separate wireless transceiver, commonly a Bluetooth compliant transceiver. The Bluetooth transceiver in the cellular telephone wirelessly communicates with a compact, head worn wireless headset. These are commonly referred to as Bluetooth headsets. The Bluetooth headset itself comprises a compact Bluetooth transceiver, a battery, an earphone, and limited user interface components. In operation, the cellular telephone functions to engage in telephone calls through the cellular network, and the Bluetooth headset enables the user to listen and speak in a hands free mode of operation without the need for a wire or cable between the cellular telephone and the headset. The Bluetooth transceivers in the cellular telephone and in the wireless headset provide the needed communications link therebetween. 
     Many users of wireless device and certain medical professionals have indicated a concern in regards to the extended use of wireless devices in the vicinity of the human brain. The concern relates to the possibility of radiational damage cause by the absorption of radio energy in the brain tissues. In fact, a reason that cellular telephone users employ headsets is the understanding that the cellular radio, being positioned a distance away from the user&#39;s brain, will result in lower radiated power levels, and thus lower radiation risk. However, in the case of a wired headset, the radio energy originating in the radio transceiver excites the audio conductors coupled to the headset, and results in radio energy being present in the acoustic driver, or speaker, as well as the microphone in the headset. Thus, the user is effectively coupling the radio energy to a position directly adjacent to their ear and brain. Other users employ the aforementioned Bluetooth wireless headsets, understanding that the wireless headset breaks the conductive link for radio energy from the cellular telephone, thereby preventing the cellular transceiver&#39;s energy from significantly coupling into the brain tissue. 
     Bluetooth transceivers operating in the 2.4 GHz ISM band, which is a frequency band known to be absorbed into brain tissue. Even though the transmitter power levels of Bluetooth transceivers are relatively low as compared to cellular transceiver power levels, the fact that the Bluetooth headset transceivers are worn directly adjacent to the user&#39;s ear and brain, creates the worst case scenario for radiational damage exposure, particularly given the absorptive nature of the 2.4 GHz operating band in brain tissue. Thus, users who chose to use a Bluetooth headset to avoid cellular radiation exposure risk, are actually substituting that exposure risk for another risk. Thus, it can be appreciated that there is a need in the art to reduce the risk of radiation exposure to users of wireless headset devices. 
     SUMMARY OF THE INVENTION 
     The need in the art is addressed by the apparatus of the present invention. The present invention teachers a wireless air tube headset that includes a wireless transceiver operating in a radio frequency band, which wireless receives audio signals. The headset includes an acoustic chamber with an acoustic port through to the exterior thereof, and an acoustic transducer that is electrically coupled to the transceiver, and that operates to generate acoustic signals. The acoustic transducer is aligned with the acoustic chamber to emit the acoustic signals through the acoustic port. There is an acoustic isolator disposed to attenuate extraneous acoustic signals emitted from the acoustic transducer and also to attenuate ambient noise entry into the acoustic chamber. An acoustic conduit is formed from an electrically non-conductive material, and has a first opening engaged with the acoustic port and a second opening engaged with an acoustic coupler, which has a first earpiece engagement means. An earpiece is engaged to the first earpiece engagement means, and thereby forms an electrically non-conductive acoustic path from the acoustic transducer to the earpiece. The acoustic path has a length to enable displacement of the transceiver and the acoustic transducer from the earpiece at a distance sufficient to yield at least a six decibel radio signal propagation power loss at the radio frequency band. 
     In a specific embodiment of the foregoing apparatus, the acoustic transducer includes a frame that supports a vibrating element, and the frame is sealably engaged with the acoustic chamber, thereby forming a closed acoustic chamber about the acoustic port. In another embodiment, the acoustic isolator includes a sealed cover about the portion of the acoustic transducer that is exterior to the closed acoustic chamber. 
     In a specific embodiment, the foregoing apparatus further includes a housing disposed about the sound chamber where the acoustic port is accessible from the exterior of the housing, and the transceiver is disposed within the housing. In a refinement to this embodiment, the apparatus also includes an antenna electrically coupled to the transceiver and disposed within the housing, and a battery disposed within the housing for powering the apparatus, and plural user interface controls electrically coupled to the transceiver disposed about the housing. In another refinement, this embodiment further includes a microphone electrically coupled to the transceiver and disposed within the housing, and the acoustic isolator includes an elastomeric shock mount disposed to isolate the microphone from the acoustic signals. 
     In another refinement to the housing embodiment of the headset, the apparatus further includes a vibrator disposed within the housing and electrically coupled to the transceiver, and adapted to produce a vibrating alert indicative of the availability of acoustic signals. In another refinement, where the apparatus is adapted for support from a person, a person&#39;s clothing, or a personal accessory, the apparatus further includes a support member disposed on the exterior of the housing for supporting the weight of the apparatus. In a refinement to this embodiment, the support member is selected from a clip, a spring loaded clip, a lanyard ring, a pin, a friction attachment, and a hook. In a particular refinement, the support member is adapted to engage the frame of a pair of eyeglasses. 
     In another refinement to the housing embodiment of the headset, the apparatus further includes an acoustic conduit storage member disposed on the exterior of the housing that is adapted to engage the acoustic conduit as it is wrapped there about. In a refinement to this embodiment, it further includes an earpiece engagement member adapted to engage the earpiece while the acoustic conduit is wrapped about the acoustic conduit storage member. 
     In a specific embodiment of the foregoing apparatus, the acoustic conduit is a flexible tube. In another specific embodiment, the acoustic conduit is a rigid pipe. In another embodiment, the acoustic conduit is adapted to support the weight of the apparatus from the earpiece. In another embodiment, the acoustic conduit is formed into the shape of an ear hook for supporting the weight of the apparatus. 
     In a specific embodiment of the foregoing apparatus, the acoustic port is sealably coupled to the acoustic conduit, and the acoustic conduit is sealably coupled to the acoustic coupler. In another specific embodiment, the first opening of the acoustic conduit is coupled to the acoustic port with a removable coupling. In a refinement to this embodiment, the removable coupling employs a connection selected from a threaded engagement, a bayonet engagement, a compression engagement, and a friction engagement. 
     In a specific embodiment of the foregoing apparatus the acoustic coupler is engaged with the second opening of the acoustic conduit with a removable coupling. In a refinement to this embodiment, the removable coupling employs a connection selected from a threaded engagement, a bayonet engagement, a compression engagement, and a friction engagement. 
     In a specific embodiment of the foregoing apparatus, the first engagement means of the acoustic coupler is configured as an acoustic opening adapted to engage an ear bud earpiece, and the headset further includes a second earpiece engagement means disposed about the earpiece engagement means that is adapted to engage an ear cup earpiece. In a refinement to this embodiment, the second earpiece engagement means employs a connection selected from a threaded engagement, a bayonet engagement, a compression engagement, and a friction engagement. In another specific embodiment, the first earpiece engagement means is adapted to engage alternate earpiece types selected from an ear bud, an ear phone, an ear insert, and an ear cup. In another embodiment, the headset further includes an ear hook coupled to support the earpiece and the acoustic coupler. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a functional block diagram of a wireless air tube headset according to an illustrative embodiment of the present invention. 
         FIG. 2  is a drawing of a head worn wireless air tube headset according to an illustrative embodiment of the present invention. 
         FIG. 3  is a drawing of a head worn wireless air tube headset according to an illustrative embodiment of the present invention. 
         FIG. 4  is a drawing of a head worn wireless air tube headset according to an illustrative embodiment of the present invention. 
         FIG. 5  is a drawing of a head worn wireless air tube headset according to an illustrative embodiment of the present invention. 
         FIG. 6  is a drawing of a head worn wireless air tube headset according to an illustrative embodiment of the present invention. 
         FIG. 7  is a drawing of a wireless air tube headset according to an illustrative embodiment of the present invention. 
         FIG. 8  is a drawing of a wireless air tube headset according to an illustrative embodiment of the present invention. 
         FIG. 9  is a section drawing of a wireless air tube headset according to an illustrative embodiment of the present invention. 
         FIG. 10  is a partial section drawing of a wireless air tube headset according to an illustrative embodiment of the present invention. 
         FIG. 11  is a partial section drawing of a wireless air tube headset according to an illustrative embodiment of the present invention. 
         FIG. 12  is a partial section drawing of a wireless air tube headset according to an illustrative embodiment of the present invention. 
         FIG. 13  is a partial section drawing of an earpiece for a wireless air tube headset according to an illustrative embodiment of the present invention. 
         FIG. 14  is a partial section drawing of an earpiece for a wireless air tube headset according to an illustrative embodiment of the present invention. 
         FIG. 15  is a partial section drawing of an earpiece for a wireless air tube headset according to an illustrative embodiment of the present invention. 
         FIG. 16  is a side view drawing of an earpiece for a wireless air tube headset according to an illustrative embodiment of the present invention. 
         FIG. 17  is a front view drawing of an earpiece for a wireless air tube headset according to an illustrative embodiment of the present invention. 
         FIG. 18  is a diagram of the auricle portion of the human ear. 
         FIG. 19  is a drawing of an ear bud earpiece for a wireless air tube headset according to an illustrative embodiment of the present invention. 
         FIG. 20  is a drawing of an ear bud earpiece for a wireless air tube headset according to an illustrative embodiment of the present invention. 
         FIG. 21  is a drawing of an ear phone earpiece for a wireless air tube headset according to an illustrative embodiment of the present invention. 
         FIG. 22  is a drawing of an ear insert earpiece for a wireless air tube headset according to an illustrative embodiment of the present invention. 
         FIG. 23  is a drawing of an ear cup earpiece for a wireless air tube headset according to an illustrative embodiment of the present invention. 
         FIG. 24  is a drawing of an ear hook earpiece for a wireless air tube headset according to an illustrative embodiment of the present invention. 
     
    
    
     DESCRIPTION OF THE INVENTION 
     Illustrative embodiments and exemplary applications will now be described with reference to the accompanying drawings to disclose the advantageous teachings of the present invention. 
     While the present invention is described herein with reference to illustrative embodiments for particular applications, it should be understood that the invention is not limited thereto. Those having ordinary skill in the art and access to the teachings provided herein will recognize additional modifications, applications, and embodiments within the scope hereof and additional fields in which the present invention would be of significant utility. 
     In considering the detailed embodiments of the present invention, it will be observed that the present invention resides primarily in combinations of components to form various apparatus and systems or combinations of steps to accomplish various methods. Accordingly, the apparatus components and method steps have been represented where appropriate by conventional symbols in the drawings, showing only those specific details that are pertinent to understanding the present invention so as not to obscure the disclosure with details that will be readily apparent to those of ordinary skill in the art having the benefit of the disclosures contained herein. 
     In this disclosure, relational terms such as first and second, top and bottom, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. The terms “comprises,” “comprising,” or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. An element proceeded by “comprises a” does not, without more constraints, preclude the existence of additional identical elements in the process, method, article, or apparatus that comprises the element. 
     The illustrative embodiments of the present invention are directed to Bluetooth compliant wireless headsets. It is understood that this is an exemplary radio environment and that other frequency bands, radio protocols, information modulations schemes, and radio signal power levels are applicable to this invention, and can similarly benefit from the teachings herein. The Bluetooth protocol is well documented and the specifics of the protocol will not be presented in this disclosure, except to the extend it is useful in understanding the teachings of these inventions. 
     The Bluetooth protocol in the United States operates in the 2.4 GHz ISM band. The protocol specification brackets transmitter radio emissions into three categories, which are; Class 1 at 100 mW (20 dBm), Class 2 at 2.5 mW (4 dBm), and Class 3 at 1 mW (0 dBm) maximum power. Device power level selection determines effective radio range, and other operating parameters of the Bluetooth compliant device. At the 2.4 GHz band, radiated power level attenuates rapidly as an inverse function of distance. The calculations are known to those skilled in the art. Radio signal level power level losses based on an isotropic radiator in free space as a function of distance are approximated in the following table: 
     
       
         
               
               
               
             
               
               
               
               
             
           
               
                   
                 TABLE 
               
               
                   
                   
               
               
                   
                 Distance 
                 Attenuation 
               
               
                   
                   
               
             
             
               
                   
               
             
          
           
               
                   
                 2  
                 meter 
                 −46 dB 
               
               
                   
                 1  
                 meter 
                 −40 db 
               
               
                   
                 50  
                 cm 
                 −34 dB 
               
               
                   
                 20  
                 cm 
                 −26 dB 
               
               
                   
                 10  
                 cm 
                 −20 dB 
               
               
                   
                 5  
                 cm 
                 −14 dB 
               
               
                   
                 2  
                 cm 
                  −6 dB 
               
               
                   
                   
               
             
          
         
       
     
     With respect to the emissions from a wireless headset, the emissions characteristics are more difficult to quantify. In addition to the antenna element of the wireless headset, the ungrounded nature of the circuit causes the entire conductive circuit to resonate in the operating band. Thus, the entire circuit behaves as a radiating element. This includes the antenna, the radio transceiver and digital circuitry, the power circuitry, as well as the audio circuits to the earpiece transducer and the microphone. However, the free spaces losses to radiated energy are proportional to the forgoing table, and the radiated power levels drop as the circuitry is displaced from a given reference point. In the present invention, displacement of the circuitry from the user&#39;s brain is the objective, while still preserving high quality audio performance and a desirable bundle of product features. This goal is achieved in the present invention through use of an air tube acoustic coupling between the acoustic transducer and the earpiece, together with displaced position of the microphone, thereby providing sufficient displacement to achieve at least 6 dB attenuation of the radiated power levels. 
     Reference is directed to  FIG. 1 , which is a functional block diagram of a wireless air tube headset according to an illustrative embodiment of the present invention. The central circuit is a commercial Bluetooth controller  4 , which includes a radio transceiver in the 2.4 GHz band, a microcontroller, power management, and input/output circuits utilized to enable a set of user interface controls. Bluetooth controllers are commercially available and are known to those skilled in the art. The circuit is powered by a rechargeable battery  6  that is charged through charge contacts  10  while the headset rests in a charging cradle (not shown) as are known to those skilled in the art. An antenna element  8  is included in the circuit, which provides the access point to the Bluetooth air interface. The circuit includes a function button  12  that enables control of the various circuit features using certain preprogrammed actuation sequences. Earpiece speaker volume is controlled with a pair of buttons, the volume up 14 and volume down  16  actuators. A light emitting diode  18  is used to indicate power, call progress events, as well as confirmation of user interface button actuations. One embodiment of the present invention includes a tactile vibrator  20 , which is activated upon receipt of an incoming telephone call, or other audio content, to alert the user in the event that the earpiece is not engaged in the user&#39;s ear, such that the user cannot hear a conventional ring tone, or other alert tone. 
     The Bluetooth headset circuits of the illustrative embodiment in  FIG. 1  include a housing  26  that contains a microphone  22  and an acoustic transducer  14 . In the illustrative embodiment the microphone  22  is a tiny electret condenser microphone exposed though a microphone port opening in the housing. The acoustic transducer  24  is a tiny loudspeaker. The acoustic transducer is coupled to an acoustic chamber  30  that gathers the acoustic signals and directs them through an acoustic port in the acoustic chamber  30  to an electrically non-conductive acoustic conduit  32  that effectively displaces all of the radio energy radiating circuits away from the earpiece  34 . The acoustic chamber  30  also serves to concentrate the acoustic energy produced by the acoustic transducer  24  to yield an efficient transfer into the acoustic conduit  32 . Audio quality and acoustic performance are enhanced through use of certain acoustic isolation means  28 . Isolation occurs between the microphone acoustic signals, the acoustic transducer audio signals, and other ambient audio signals and noise that might otherwise be coupled into the acoustic environment. The isolation means  28  will be more fully discussed hereinafter. Note that other circuit components of  FIG. 1  are typically positioned into the interior of the housing  26 . 
     Reference is directed to  FIG. 2 , which is a drawing of a head worn wireless air tube headset according to an illustrative embodiment of the present invention. A profile line drawing view of a human head  36  illustrates the general positional relationship of the auricle portion of the ear  38  (commonly referred to as the outer ear) and the sensitive brain tissue  40 . As noted hereinbefore, the object of the air tube wireless headset is to displace the radiating circuit components away from the brain  40 , which is, to a large extent, synonymous with displacing it away from the ear  38 , provided that the displacement from the ear isn&#39;t upward or rearward. The conductive and radiating wireless headset circuitry is enclosed in a housing  48  that is clipped to the collar  42  of the user&#39;s shirt in this embodiment. An electrically non-conductive acoustic conduit  46  in the form of a flexible plastic tube couples the acoustic signals to an earpiece  44  that is held adjacent to the user&#39;s ear  38  in this embodiment. Thusly, a displacement of the radiating circuitry from the user&#39;s brain on the order of approximately 10-to-20 cm is achieved, which results in a radiated power level reduction in the 20-to-26 decibel range. 
     Reference is directed to  FIG. 3 , which is a drawing of a head worn wireless air tube headset according to an illustrative embodiment of the present invention. In this illustrative embodiment, the earpiece  50  is an ear bud that engages the ear canal to support the Bluetooth circuitry using a non-conductive rigid pipe acoustic conduit  52 . The length of the rigid pipe  52  can be selected to yield a displaced length in the range of 5-to-10 cm, which results in a radiated power level reduction in the 14-to-20 decibel range. 
     Reference is directed to  FIG. 4 , which is a drawing of a head worn wireless air tube headset according to an illustrative embodiment of the present invention. In this illustrative embodiment, the earpiece  62  is held adjacent to the ear  38  using an ear hook  60  for support of the apparatus. The ear hook  60  engages the outer portion of the ear  38  and is coupled to the rigid pipe acoustic conduit  58  that is further coupled to the circuitry housing  56  of the apparatus. The ear hook  60  is also non-metallic and can be coupled to the acoustic conduit  58  as illustrated, or to the earpiece  62 , or to the circuitry housing  56 . The length of the non-metallic rigid pipe acoustic conduit  58  can be selected to yield a displaced length in the range of 5-to-10 cm, which results in a radiated power level reduction in the 14-to-20 decibel range. 
     Reference is directed to  FIG. 5 , which is a drawing of a head worn wireless air tube headset according to an illustrative embodiment of the present invention. In this embodiment, the earpiece  68  is held adjacent to the user&#39;s ear  38  with an ear hook  66  that also serves as the acoustic conduit coupled to the circuitry housing  64 . Various types of earpiece designs can be employed in this embodiment since the primary support is achieved using the ear hook  66 . The non-metallic acoustic tube serves to provide the isolation and radio energy displacement. The length of the acoustic conduit  66  can be selected to yield a displaced length in the range of 5-to-20 cm, which results in a radiated power level reduction in the 14-to-26 decibel range. 
     Reference is directed to  FIG. 6 , which is a drawing of a head worn wireless air tube headset according to an illustrative embodiment of the present invention. In this embodiment, a pair of eyeglasses  70  is advantageously employed to support the circuitry housing  74  of the apparatus. The housing  74  is supported from the bow  72  of the eyeglasses  70  using a suitable clip. A non-metallic tube  76  is used from the acoustic conduit, which is coupled to an earpiece  78 . Note that the displacement from the brain  40  appears to be slightly less than when compared to the previous embodiments. However, the lateral displacement is enhanced since the bow  72  of the eyeglasses  70  is also displaced away from the head  36 . The total displacement from the brain will be greater than 2 cm to a distance greater than 5 cm, depending of the arrangement, which results in a radiated power level reduction in the range of more than 6 decibels to somewhat more than 14 decibels. 
     Reference is directed to  FIG. 7 , which is a drawing of a wireless air tube headset according to an illustrative embodiment of the present invention. This embodiment illustrates certain novel feature of the invention. The circuitry housing  80  presents the aforementioned function button  96  and the volume up and volume down button  94 ,  92 . In addition, the LED indicator lamp  90  is presented. Other user interface configurations are also possible, as will be appreciated by those skilled in the art. A lanyard ring  88  is provided to further enable support, retention and transportation of the apparatus. Since the acoustic conduit  82  may have considerable length in some embodiments, conduit retention means  98 ,  100  are provided. The conduit retention means  98 ,  100  enable the coiled wrapping of the acoustic conduit  82  there about. The acoustic conduit  82  is terminated with an acoustic coupling  84  that engages the earpiece  86  to the acoustic conduit  82 , and orients the earpiece  86  for comfortable use while wearing in the ear. An acoustic coupling engagement means  102  is provided so that the acoustic conduit is retained from unwrapping from the conduit retention means  100 ,  102 . In certain embodiments, the acoustic coupling retention means  102  orients the earpiece  86  such that the apparatus can be worn and function while the acoustic conduit  82  is wrapped. 
     Reference is directed to  FIG. 8 , which is a drawing of a wireless air tube headset according to an illustrative embodiment of the present invention. This embodiment illustrates certain novel features of the invention. The circuitry housing  104  presents the aforementioned function button  124  and the volume up and volume down button  122 ,  120 . In addition, the LED indicator lamp  118  is presented. Other user interface configurations are also possible, as will be appreciated by those skilled in the art. The acoustic conduit  106  extends from the circuitry housing  104  and is coupled to the earpiece  110  with a right-angled acoustic coupler  108 . The earpiece  110  is removably engaged with the acoustic coupler  108 , which enables the user to select from among plural earpiece sizes and types which will be more fully described hereinafter. The illustrative embodiment of  FIG. 8  also includes a clip  112  that is coupled to the housing  104  with a spring hinge  116 . The user can urge the clip  112  to a open position  114 , thereby enabling attachment to clothing or other articles. 
     Reference is directed to  FIG. 9 , which is a section drawing of a wireless air tube headset according to an illustrative embodiment of the present invention. The structure represents one structural embodiment. Those skilled in the art will appreciate that the shape and proportions can be adapted to suite various industrial design and marketing criteria. The circuit housing  126  is a molded thermoplastic structure that encloses the Bluetooth controller  154 , the rechargeable battery  158  and a 2.4 GHz antenna  156 . Battery charging terminals  144  are presented on the exterior of the housing  126  to facilitate charging of the battery  158 . The function button  152 , the volume-up button  150 , the volume-down button  148 , and the LED lamp  146  are also presented on the exterior of the housing  126 . An electret condenser microphone  128  is retained in the housing adjacent to an opening to allow audio signals to reach the microphone  128  diaphragm. An isolation means  130 , in the form of a resilient elastomeric shock mount isolates other audio signals, including handling noise and speaker acoustic signals from reaching the sensitive microphone element  128 . The received audio signals are reproduced by an acoustic transducer  132 . 
     The acoustic transducer  132  is a tiny loudspeaker having a vibrating element disposed within a frame. The acoustic transducer  132  frame is sealably engaged with an acoustic chamber  134  having an acoustic port  135  coupled to the exterior of the housing  126 . A second isolation means  136  encloses the opposite side of the acoustic transducer  132  from the acoustic chamber side. The second isolation means  136  is a molded cap in the illustrative embodiment, but other acoustic signal blocking materials and shapes could also be utilized. A sound insulating material can also be added within the housing  126 . A non-conducive acoustic conduit  138  is engaged to the acoustic port  135  at a first end. In the illustrative embodiment, the acoustic conduit  138  may be a flexible plastic or rubber tube, a rigid thermoplastic pipe, or other suitable non-conductive acoustic conduit, as will be appreciated by those skilled in the art. At the second end of the acoustic conduit  138  is an acoustic coupler  140  that serves to receive the second end of the acoustic conduit  138  and an earpiece  142 . In the illustrative embodiment, the acoustic coupler  140  is formed at a right angle to facility routing of the acoustic conduit  138  from the user&#39;s ear during use. The acoustic coupler  140  can also serve as the support point for an ear hook or other body worn support structure. The earpiece  142  is removably coupled to the acoustic coupler  140 , thereby enabling selection and attachment of a variety of sizes and types of earpieces. Thusly, the acoustic signals produced by the acoustic transducer  132  are contained by the acoustic chamber  134  and directed through the acoustic port  135  into the acoustic conduit  138 , then directed to the acoustic coupler  140 , and finally to the earpiece  142 , which is engaged with the users ear. 
     Reference is directed to  FIG. 10 , which is a partial section drawing of a wireless air tube headset according to an illustrative embodiment of the present invention. This embodiment illustrates a selectively connectable acoustic conduit  170 . This embodiment enables the user to make changes and adjustments to the apparatus, such as changing the length of the conduit, changing the type of acoustic coupler and earpiece, and changing between flexible and rigid acoustic conduits, and so forth. The partial section drawing of  FIG. 10  illustrates the housing  166  having the acoustic chamber  166  with the acoustic transducer  164  disposed therein. The acoustic port  165  couples the acoustic chamber  166  to the exterior of the housing  160 . An isolation means  162  encloses the back side of the acoustic transducer  164 . A removable coupling  168  is attached to a first end of the acoustic conduit  170 , and removably engages the acoustic port  165 . The attachment between the removable coupler  168  and the acoustic port  165  can be by threaded engagement, bayonet coupling, friction fit, compression fit, or other sealable engagement means as are known to those skilled in the art. At the second end of the acoustic conduit  170 , there is a second removable coupler  172  that removably engages the acoustic coupler  174 . The second removable coupler can also be by threaded engagement, bayonet coupling, friction fit, compression fit, or other sealable engagement means as are known to those skilled in the art. The earpiece  176  removably engages the acoustic coupler  174 . 
     Reference is directed to  FIG. 11 , which is a partial section drawing of a wireless air tube headset according to an illustrative embodiment of the present invention. The partial section drawing of  FIG. 11  illustrates the housing  180  having the acoustic chamber  184  with the acoustic transducer  186  disposed therein. The acoustic port  190  couples the acoustic chamber  184  to the exterior of the housing  180 . An isolation means  182  encloses the back side of the acoustic transducer  186 . A removable coupling  188  is attached to a first end of the acoustic conduit  192 , and removably engages the acoustic port  190 . In  FIG. 11 , the coupler  188  is disengaged from the port  190 . The attachment between the removable coupler  188  and the acoustic port  190  can be by threaded engagement, bayonet coupling, friction fit, compression fit, or other sealable engagement means as are known to those skilled in the art. At the second end of the acoustic conduit  192 , there is a second removable coupler  194  that removably engages the acoustic coupler  198 . The second removable coupler  196  can also be by threaded engagement, bayonet coupling, friction fit, compression fit, or other sealable engagement means as are known to those skilled in the art. The earpiece  200  removably engages the acoustic coupler  200 . Together, the foregoing components form a complete and sealed acoustic path from the acoustic transducer  186  to the earpiece  200 . 
     Reference is directed to  FIG. 12 , which is a partial section drawing of a wireless air tube headset according to an illustrative embodiment of the present invention. The housing  202 , acoustic transducer  204 , acoustic chamber  208 , isolation means  204 , and acoustic port  210  are similar to those discussed with respect to  FIG. 9 . In  FIG. 12 , a non-conductive rigid pipe  212  is used as the acoustic conduit. A first end of the acoustic conduit us sealably coupled to the acoustic port  210 . A second end of the acoustic conduit transitions into an acoustic coupler  216 , which may be formed as a portion of a single complete unit. The essential aspect of the acoustic coupler  216  is that it engages the earpiece  218 . An ear hook  214  is fixed to the acoustic conduit  212 , which engages the user&#39;s ear to support the apparatus during use. 
     Reference is directed to  FIG. 13 , which is a partial section drawing of an earpiece for a wireless air tube headset according to an illustrative embodiment of the present invention. The present invention contemplates a variety of earpiece types that are adapted to meet the needs of particular users. The illustrative embodiment employs an acoustic coupler that is adapted to connect the acoustic conduit to the earpiece, which may be removably connected thereto. In  FIG. 13 , and ear bud  232  earpiece is illustrated. An ear bud engages the canal of the user&#39;s ear to retain the earpiece in place. The ear bud  232  is fabricated from a resilient elastomeric material so that if can compressively engage the user&#39;s ear. The ear bud  232  engages the acoustic coupler  230  that couples the acoustic signals a right angle to the acoustic conduit  226 . There is a removable coupling  228  between the acoustic conduit  226  and the acoustic coupler  230  in this embodiment. 
     Reference is directed to  FIG. 14 , which is a partial section drawing of an earpiece for a wireless air tube headset according to an illustrative embodiment of the present invention. In this illustrative embodiment, an ear phone  240  earpiece is adapted for use with the invention. The ear phone  240  is held in close proximity to the user&#39;s ear, and may support weight of the apparatus by resting against the outer ear, but does not compressively engage the ear. The ear phone  240  may be fabricated from a rigid material. The ear phone  240  engages the acoustic coupler  238  that couples the acoustic signals a right angle to the acoustic conduit  234 . There is a removable coupling  236  between the acoustic conduit  234  and the acoustic coupler  238  in this embodiment. 
     Reference is directed to  FIG. 15 , which is a partial section drawing of an earpiece for a wireless air tube headset according to an illustrative embodiment of the present invention. In this illustrative embodiment, an ear cup  248  earpiece is adapted for use with the invention. The ear cup  248  is adapted to be held over the outer ear in supra-aural fashion, and is engaged with the acoustic coupler  244  using an adaptor plate  246 . The ear cup  248  is particularly suitable for user who wear a hearing aid, or who feel discomfort by placing objects into their ear. The ear cup  248  does not hold itself in position and cannot support the weight of the apparatus, therefore, some other support member is required. The ear phone  248  may be fabricated from a rigid or pliable material. The ear cup  248 ,  246  engages the acoustic coupler  244  that couples the acoustic signals a right angle to the acoustic conduit  242 . There is a removable coupling  244  between the acoustic conduit  242  and the acoustic coupler  244  in this embodiment. 
     Reference is directed to  FIG. 16 ,  FIG. 17 , and  FIG. 18 , which are a side view, front view, and alternate side view drawing of an earpiece for a wireless air tube headset according to an illustrative embodiment of the present invention. In this illustrative embodiment, the acoustic coupler  250  has a first opening  254  adapted to acoustically engage the acoustic conduit  256  in a manner similar to the previously discussed illustrative embodiments. The acoustic coupler  250  further includes a second opening  254  adapted to engage a first type of earpiece. In  FIG. 16 , and ear bud  262  earpiece is illustrated as being engaged with the second opening  254 , while an alternate ear cup  264  is not engaged. This illustrative embodiment further includes a second means  258  for attaching an earpiece. This is an annular ring  258  that retains a removably connected ear cup  264 . The annular ring  258  may engage the ear cup  264  by threadable engagement, by bayonet flanges, by friction, by compression, or by other means known to those skilled in the art.  FIG. 18  illustrates the ear cup  264  engaged with the annular ring  258  while the ear bud  262  is removed. This arrangement enable the use of the apparatus in two modes, an ear supported mode employing the ear bud  262  as the support means, and a supra-aural mode utilizing the ear cup  264 . The ear cup  264  is particularly well suited for use with a hearing aid since it does not approach the ear canal, and since there is no electrical circuitry nearby to interfere with the electrical operations and signals processed within the hearing aid. 
     Reference is directed to  FIG. 19 , which is a diagram of the auricle portion of the human ear. The present invention contemplates various earpiece designs that are coupled by non-conductive structures and acoustic conduits to the circuit housing discussed hereinbefore. The various earpiece designs are intended to address the requirements and preferences of various users. In general, there is a need to route the acoustic signals to the area adjacent to the ear canal, a need to hold the earpiece in position at the ear, and a need to support the weight of the apparatus. The earpiece must address the first two requirements, and may address the third requirement.  FIG. 19  illustrates the anatomical structure of the outer ear, referred to as the auricle. The upper portion of the auricle is the helix, which couples to the side of the head at the root of the ear. Sound passes to the eardrum through canal. The canal is coupled to the auricle by the funnel-shaped concha. The concha is bounded at the top and rear by the antihelix, and at the bottom by the targus toward the front ad the antitargus toward the rear. The lowest extent of the auricle is the lobule. 
     Reference is directed to  FIG. 20 , which is a drawing of an ear bud earpiece for a wireless air tube headset according to an illustrative embodiment of the present invention. An ear bud is characterized in that it is pressed into and supportively engages the ear canal. In this illustrative embodiment, the ear bud  270  is pressed into the ear canal and the acoustic conduit  272  is routed away. 
     Reference is directed to  FIG. 21 , which is a drawing of an ear phone earpiece for a wireless air tube headset according to an illustrative embodiment of the present invention. An ear phone is characterized in that it is place in to or directly adjacent to the concha. It does not enter the canal, but it may hand from the targus and antitargus. In this illustrative embodiment, the ear phone  274  is positioned into the concha and the acoustic conduit  276  is routed away. 
     Reference is directed to  FIG. 22 , which is a drawing of an ear insert earpiece for a wireless air tube headset according to an illustrative embodiment of the present invention. An ear insert is similar to an ear phone in that the earpiece is inserted into the concha, but not the canal. In  FIG. 22 , the ear insert  278  emits the acoustic signals to the ear. The ear insert  278  is supported by a pair of flexible members  280  that engage the rim of the concha, including the antihelix, the targus, and the antitargus. An acoustic conduit  282  couples the acoustic signals to the ear insert  278 . 
     Reference is directed to  FIG. 23 , which is a drawing of an ear cup earpiece for a wireless air tube headset according to an illustrative embodiment of the present invention. An ear cup  284  is a supra-aural earpiece that is placed against the outer ear. The acoustic conduit  286  couples acoustic signals to the ear cup  284 . 
     Reference is directed to  FIG. 24 , which is a drawing of an ear hook earpiece for a wireless air tube headset according to an illustrative embodiment of the present invention. Various earpieces  288  can be adapted for use with the ear hook  290 . Acoustic signals are coupled to the earpiece  288  through an acoustic conduit  288 . The ear hook  290  can connect to the earpiece  292 , the acoustic conduit  292 , or the acoustic coupler (not shown). 
     Thus, the present invention has been described herein with reference to a particular embodiment for a particular application. Those having ordinary skill in the art and access to the present teachings will recognize additional modifications, applications and embodiments within the scope thereof. 
     It is therefore intended by the appended claims to cover any and all such applications, modifications and embodiments within the scope of the present invention.