Audio frequency automatic muting arrangements

Details Audio frequency automatic muting arrangements Audio frequency automatic muting arrangements

H - Electricity

04

B

179/5

H04B 15/00 (2006.01) H03G 3/32 (2006.01) H03G 3/34 (2006.01)

Patent

CA 1062168

IMPROVEMENTS IN OR RELATING TO AUDIO FREQUENCY AUTOMATIC MUTING ARRANGEMENTS ABSTRACT OF THE DISCLOSURE In an automatic audio frequency muting arrangement, intelligence and noise signals in a received audio frequency signal are detected and the levels of the detected intelligence and noise signals are compared. The result of this comparison controls a muting switch in the audio frequency path. The intelligence signals are detected by a capacitive time constant circuit which is of relatively short time constant, and the noise signals are detected by a capacitive time constant circuit of relatively long time constant. The time constant capacitor for noise signal detection can be isolated from the input during those times in which intelligence signals are present in the received audio frequency signal.

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