H - Electricity – 04 – M
Patent
H - Electricity
04
M
179/36, 379/4
H04M 3/56 (2006.01) H04N 7/15 (2006.01)
Patent
CA 1193552
- 24 - A VOICE-ACTUATED SWITCHING SYSTEM Abstract A voice-actuated switching system selectively connects multiple microphones to an audio line in accordance with the output signal levels from each of the microphones. Comparison circuitry including an analog multiplexer, a nonlinear amplifier, an analog demultiplexer, a peak detector, an analog multiplexer, an analog to digital connecter and a centrol processing unit determines the state of each microphone which can exist in one of three states: selected, mixed, or off. The microphone with the greatest output signal level at any given time is considered in the selected state and is selected for connecting to the audio line with no loss. Those microphones in the mixed state have their output signal levels attenuated before being connected to the audio line. And those microphones in the off state have their outputs essentially disconnected from the audio line. The user of a microphone which is in the mixed state can be heard along with the user of a microphone which is in the selected state, but at a lower level. Improved accuracy is obtained in the microphone selection process by comparing the microphone signals to each other and to a reference level that takes into account any offsets induced into the signals by the system. The system can accommodate any number of microphones.
421746
Lee Byung H.
Lynch John F. Jr.
Kirby Eades Gale Baker
Western Electric Company Incorporated
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