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An audio data transmission device for transmitting binary coded audio tones over a telephone system. The audio data transmission device is adapted to be utilized with a hand-held, data collection terminal provided with a speaker emitting binary coded audio tones. The transmission device consists of

An audio data transmission device for transmitting binary coded audio tones over a telephone system. The audio data transmission device is adapted to be utilized with a hand-held, data collection terminal provided with a speaker emitting binary coded audio tones. The transmission device consists of a muff for receiving the microphone portion of a conventional telephone handpiece and a solid transmission element. The transmission element is adapted to be mechanically connected to the housing for the terminal for channeling the data tones to the telephone handset without dampening. The transmission element is defined to be mechanically tuned to the characteristics of the telephone microphone to minimize the generation of second harmonics of the desired audio tones.

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An audio data transmission device for coupling audio tone signals to a conventional telephone handpiece microphone comprising a telephone handpiece muff comprising a cup-like configuration having two open ends, one end adapted to be slipped over the microphone end of the telephone handpiece and havi

An audio data transmission device for coupling audio tone signals to a conventional telephone handpiece microphone comprising a telephone handpiece muff comprising a cup-like configuration having two open ends, one end adapted to be slipped over the microphone end of the telephone handpiece and having an inside diameter to receive the handpiece microphone end in an acoustic sealing relationship, the opposite end of the muff having an internal flange spaced a distance from said one end to receive the telephone handpiece so as to completely enclose the microphone portion of the handpiece, said one end including a dependent, inwardly extending sealing element adapted to hug the telephone handpiece in an acoustic sealing relationship, said internal flange having a soft, acoustical sealing element secured thereto for acoustically sealing the microphone end of the handset when mounted in the muff, and an audio tone signal transmitting element having two open ends with one end secured to said internal flange of the muff and having an inner diameter substantially the same as the diameter of the sound receiving portion of the telephone microphone, said audio tone signal transmitting element having a preselected length for transmitting audio signals therein and selected to minimize the tendency of the telephone microphone to generate second harmonics in response to the audio signals transmitted thereto.