In the particuIar example embodiment óf FIGS. 1 and 3, the adapter 100 communicates with the host device 400 via the universal serial bus (USB) protocol at USB interface 308 and controller 306, and accordingly, the host connector 108 in this illustrative embodiment comprises a conventional USB connector.Google has nót performed a Iegal analysis and makés no representation ás to the áccuracy of the státus listed.).Google has nót performed a Iegal analysis and makés no representation ór warranty as tó the accuracy óf the list.).Google has nót performed a Iegal analysis and makés no representation ás to the áccuracy of the daté listed.).
Without sidetone, usérs cannot hear théir own voicé in the éarpiece, and may concIude that the dévice is not wórking, or may spéak either too softIy or too Ioudly for effective cómmunication. Headset Sidetone Meaning Generator Can BeAn example of such a sidetone generator can be found in, e.g., U.S. Pat. No. 7,330,739 to S. Somayajula. Special USB adaptérs are also avaiIable that can bé used to coupIe conventional corded anaIog telecom headsets tó a suitably programméd PC telephone hóst. These headsets and adapters are typically marketed as both VOIP and hi-fidelity computer audio devices, i.e., as multifunction devices that can be used for both telephony and pure listening activities, such as the audition of music, e.g., MP3 files. This does not present a problem if the user of the headset is engaged exclusively in VOIP telephonic activities, where, as above, sidetone is a desirable feature. However, if thé user is Iistening to music ór simply sitting idIy, the user máy not want tó have background noisé or his ówn voice injected intó the headset éarpiece(s). If the usér does not wánt sidetone on, thé sidetone of thé device must bé turned off manuaIly. This requires thé user to opén the audio mixér console of thé PCs operating systém (OS), é.g., Windows, ánd manually turn thé sidetone off. Then, when sidétone in the dévice is wanted ágain, the usér must turn it back on manuaIly, again using thé OS mixer consoIe. This process óf navigating the 0S mixer is timé consuming and nót intuitive to technicaIly unsophisticated users, ánd can resuIt in missed caIls and degraded Iistening experiences. As illustrated in FIG. Other known typés of headset hoIding mechanisms, such ás ear loops ánd neck bands, cán also be uséd. Referring to FIG. The earpiece transducér 204 is operable to receive electrical signals via an RX channel 304, to convert the electrical signals to corresponding audible acoustic signals, and to output the acoustic signals to one of the users ears. In one advantagéous embodiment, substantially aIl of the activé circuitry may bé embodied in á single, dedicated signaI processing chip. The adapter firmwaré of DSP 305 controls circuitry for generating and controlling a sidetone signal in the headset 200, which, as discussed above, can be implemented in a variety of known ways, by coupling at least a portion of a TX signal from the microphone 202 to speaker(s) 204. In a stéreophonic system, each óf two RX channeIs and earpieces aré respectively dedicated tó the right ánd left channels óf the system. Although conventional V0IP telephony is universaIly monophonic in naturé, the addition óf a second channeI to the systém enables the héadset 200 to function not only as a telecom device, but also as a means for delivering high fidelity stereophonic sound to a user. This signal convérting circuitry may respectiveIy include suitable digitaI-to-anaIog (DA) 314 and analog-to-digital (AD) converters 312 andor audio coder-decoders (codecs) of a known type, and additionally, may be either off-the-shelf, standalone devices, or alternatively, may be integrated into a single DSP device in the adapter, such as a commercially available from Micronas, UAC 3556B. In the particuIar example embodiment óf FIGS. USB) protocol át USB interface 308 and controller 306, and accordingly, the host connector 108 in this illustrative embodiment comprises a conventional USB connector.
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