H - Electricity – 04 – R
Patent
H - Electricity
04
R
179/36, 179/4
H04R 27/00 (2006.01) H04R 3/00 (2006.01)
Patent
CA 1068218
Abstract of the Disclosure A control system for an audio amplifying system which has a plurality of microphones producing individual output signals. Each microphone has an analog switch connected thereto for turning the microphone on and off in response to a control signal which is produced by a control means which is responsive to the output signal of the microphone for enabling the analog switch when the microphone output signal is above a predetermined threshold level. A reference signal is supplied to the control means for establishing the threshold level at which the control means enables the analog switch. This reference signal is modulated according to the amplitude of the microphone output signal so that the threshold level of the control means is automatically varied to avoid enabling the analog switch in response to undesirable audio signals. More specifically, the reference signal is preferably modulated in direct proportion to the amplitudes of the envelopes of the output signals of the microphones that are turned on so that the thresholds of the control means are increased in direct proportion to the amplitudes of the envelopes of the microphone output signals, thereby varying the sensitivities of the microphones in inverse proportion to the amplitudes of the envelopes. The control system also includes a plurality of delay circuits each of which is responsive to a termination of the output signal from one of the control means for enabling the corresponding analog switch for a predetermined time interval after the microphone output signal drops below its threshold level, thereby keeping the microphone turned on during normal pauses in the audio input to the microphone. The system also includes a reset feature for automatically resetting the entire system whenever output signals are produced simultaneously by two or more of the control means; an audio signal that produces such a response is presumed to be undesirable and the resetting of the system prevents the transmission of such an audio signal. The system also includes a limiting feature which permits more than one microphone to be on at the same time, while limiting the maximum number of microphones that can be on at the same time. However, even when more than one microphone is allowed to turn on at the same time, the microphones must turn on and off at intervals greater than predetermined minimum intervals or "stages". The microphones may also be turned on and off by manually operated switches rather than by the audio input signals, if desired.
273286
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