Noise reduction system

Details Noise reduction system Noise reduction system

1977-05-23

1979-07-24

Gensler, Paul L.

Wave transmission lines and networks

Amplitude compression and expansion systems

179 1P, 325 62, 330126, H04B 164

Patent

active

041624629

ABSTRACT:
A noise reduction system is provided with an encoder for compressing the dynamic range of an audio input signal in accordance with the amplitude of the input signal and recording the compressed one into a tape recorder, and a decoder for expanding the dynamic range of a reproduced audio signal from the tape recorder to the original one in accordance with the amplitude of the reproduced audio signal. The encoder includes a first controlled amplifier circuit in which, when the input audio signal is in low- and middle-levels, sufficient emphasis is made to the signal at high frequencies, and when it is in high-level, the emphasis quantity at high frequencies is restrictive. The decoder includes a second controlled amplifier circuit having a transfer function related to the character of the first controlled amplifier circuit substantially in inverse-function manner.

REFERENCES:
patent: 3304369 (1967-02-01), Dreyfus
patent: 3735290 (1973-05-01), Yamazaki
patent: 3815039 (1974-06-01), Fujisawa et al.
patent: 3873945 (1975-03-01), Muraoka
patent: 3903485 (1975-09-01), Dolby
patent: 3969680 (1976-07-01), Wermuth
patent: 4072914 (1978-02-01), Haramoto et al.

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