Stereophonic receiver having a noise reduction control circuit

Details Stereophonic receiver having a noise reduction control circuit Stereophonic receiver having a noise reduction control circuit

1983-07-15

1986-03-04

Rubinson, Gene Z.

Electrical audio signal processing systems and devices

Binaural and stereophonic

Broadcast or multiplex stereo

381 13, H04H 500

Patent

active

045743894

ABSTRACT:
A stereophonic receiver includes internal separation control in which the sound separation is directly in accordance with noise reduction need and the amplitude and frequency of the sound signals monitored. Each sound channel is similar and includes an input buffer and an output buffer to directly transmit the corresponding channel signal. A variable highpass filter unit interconnects the output buffer of each channel to the opposite channel, and includes a voltage sensitive input to control the transmitted signal level. A control channel includes a high frequency filter to pass the high frequency signal of the stereophonic sound, which signal is rectified and filtered by suitable attack and decay filters. A log-conversion unit senses and converts the filtered signal to a C. logarithmic D.C. signal, which is directly proportional to the amplitude and frequency of the corresponding channel stereophonic signal. The D.C. signal is connected to the input of the filter unit and inversely adjusts the bandwidth thereof and thereby inversely controls blending of the stereo signals. A low limit control is connected to the input of the log-conversion unit. A high limit and mono-signal limit control is connected directly to the variable filter unit.

REFERENCES:
patent: 3823268 (1974-07-01), Modafferi
patent: 4221928 (1980-09-01), Franssen et al.
patent: 4379207 (1983-04-01), Kubota
patent: 4390749 (1983-06-01), Pearson
patent: 4426727 (1984-01-01), Hamada

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