Speakerphone with dynamic level discriminator

Details Speakerphone with dynamic level discriminator Speakerphone with dynamic level discriminator

1978-01-30

1979-04-03

Claffy, Kathleen H.

179 1P, 179 1VL, H04M 160

Patent

active

041478924

ABSTRACT:
In this speakerphone the peak value of the microphone output must be above the (variable threshold) average value to cause switching to transmit mode, thus providing dynamic compensation for ambient noise. In addition, a feedback path rapidly reduces the average value threshold if ambient noise such as a fan suddenly stops to cause the average value to be momentarily larger than the peak.

REFERENCES:
patent: 3751602 (1973-08-01), Bruden
patent: 3963868 (1976-06-01), Randmere et al.

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