Infrared remote telephone system level control

Details Infrared remote telephone system level control Infrared remote telephone system level control

1983-03-18

1984-12-25

Rubinson, Gene Z.

179 2R, H04M 160

Patent

active

044905840

ABSTRACT:
A telephone system having a remote microphone and associated transmitter, and a network located receiver for signals outgoing over the telephone network and including a local loudspeaker to broadcast signals incoming over the telephone network wherein the loudspeaker audio level is controlled to vary with the level of the received microphone signal. The level of the loudspeaker signal is increased when the received microphone signal increases, and vice versa, allowing the user to control the loudspeaker level by adjusting mouth-to-microphone distance or speech loudness. In particular implementation the signal applied to the network from the remote microphone receiver is automatically attenuated above a certain level to match network requirements. The degree of attenuation is used to cause a corresponding increase in the loudspeaker volume level. Harmful feedback is avoided since loop gain remains constant. Proper microphone signal level and loudspeaker volume are assured by the reflex reaction of bringing the microphone closer to the mouth or speaking louder if loudspeaker volume is too soft.

REFERENCES:
patent: 3596011 (1971-07-01), Alexandrovich
patent: 4291411 (1981-09-01), Muller et al.

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