Telephonic communications – Substation or terminal circuitry – For loudspeaking terminal
Patent
1992-04-08
1993-04-13
Dwyer, James L.
Telephonic communications
Substation or terminal circuitry
For loudspeaking terminal
381 83, 381 93, H04M 160
Patent
active
052029182
ABSTRACT:
A preferred duplex communications device includes a speaker for transmitting a signal received from a remote source, first and second microphones for transducing received acoustical signals wherein the first microphone is positioned significantly closer to the speaker than the second microphone so that the first microphone receives significantly more acoustical signal strength from the speaker than the second microphone. A first amplifier is connected to the first microphone and a second amplifier is connected to the second microphone wherein the second amplifier has a gain relative to a gain of the first amplifier such that the output signals of the first and second amplifiers are generally equal with respect to signals received by way of the speaker. A filter is then connected to the outputs of the first and second amplifiers to filter the signals transduced from the speaker thereby preventing transmission to the remote source of essentially all of the signals from the speaker.
REFERENCES:
patent: 4908855 (1990-03-01), Ohga et al.
patent: 4932063 (1990-05-01), Nakamura
patent: 5027393 (1991-06-01), Yamamura et al.
Dwyer James L.
Maxcom Electronics, Inc.
Shehata Magdy
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