Signal processing system using a compressor and an expander

Details Signal processing system using a compressor and an expander Signal processing system using a compressor and an expander

1987-10-07

1989-08-29

LaRoche, Eugene R.

Wave transmission lines and networks

Amplitude compression and expansion systems

330279, 381106, H04B 164, H03G 700

Patent

active

048621188

ABSTRACT:
In a signal processing system used for recording and reproducing acoustic signals, a compressor comprises a first detector for detecting an output signal from an amplifier by a first time constant, a second detector for detecting the output signal from the amplifier by a second time constant which is shorter than the first time constant, a threshold means for detecting a signal from the second detector to output a signal component exceeding a threshold level, and a combining means for combining signals from both the first detector and the threshold to thereby generate an output to the amplifier. An expander in the signal processing system comprises a first detector for detecting an input signal to be inputted into an amplifier by a first time constant, a second detector for detecting the input signal to the amplifier by a second time constant which is shorter than the first time constant, a threshold means for detecting a signal from the second detector to output a signal component exceeding a threshold level, and a combining means for combining signals from both the first detector and the threshold means to thereby generate a signal to the amplifier.

REFERENCES:
patent: 3789143 (1974-01-01), Blackmer
patent: 4114115 (1978-09-01), Minnis
patent: 4281295 (1981-07-01), Nishimura et al.
patent: 4449106 (1984-05-01), Ishigaki et al.
patent: 4521138 (1985-06-01), Akagiri et al.
patent: 4683449 (1987-07-01), Kato
Video Recording and Playback Systems-Beta Hi-Fi VCR, published in Aug., 1983.

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