Noise reduction by integrating frequency-split signals with diff

Details Noise reduction by integrating frequency-split signals with diff Noise reduction by integrating frequency-split signals with diff

1982-10-18

1984-04-10

Griffin, Robert L.

Telecommunications

Transmitter and receiver at separate stations

With control signal

333 14, 381 94, 381106, H04B 164

Patent

active

044425465

ABSTRACT:
A noise reduction circuit comprising first and second variable frequency amplifiers (3, 4; 12, 13) for respectively amplifying first and second audio signals at variable gains in response to a control signal, a frequency splitter (23-26; 42-45) for splitting each output signal of the first and second variable gain amplifiers into high and low frequency components, an envelope detector (27-30; 46-49) for detecting the envelopes of the high and low frequency components of each audio signal and generating therefrom first and second high frequency component envelopes and first and second low frequency component envelopes, a combining circuit (31, 32; 50, 51) for combining the first and second high frequency component envelopes to generate a combined high frequency output and combining the first and second low frequency component envelopes to generate a combined low frequency output, and means (33-35; 52-54) for integrating the combined high frequency output with a smaller time constant and integrating the combined low frequency output with a greater time constant and combining the integrated outputs to generate a signal as said control signal.

REFERENCES:
patent: 3798562 (1974-03-01), Takahashi et al.
patent: 4177356 (1979-12-01), Jaeger et al.

Affiliated with

Also associated with

Rating

Noise reduction by integrating frequency-split signals with diff does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Noise reduction by integrating frequency-split signals with diff, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Noise reduction by integrating frequency-split signals with diff will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-897163