Compander circuit which produces variable pre-emphasis and de-em

Details Compander circuit which produces variable pre-emphasis and de-em Compander circuit which produces variable pre-emphasis and de-em

1981-01-21

1982-06-29

Gensler, Paul L.

Wave transmission lines and networks

Amplitude compression and expansion systems

179 1P, H04B 164

Patent

active

043374450

ABSTRACT:
A noise reduction circuit used for signal expansion in a noise-reducing decoder for a signal reproducer, and/or for level-compression in a noise-reducing encoder for a signal recorder, includes a first signal path connected to receive a subtraction signal and including a variable gain amplifier for amplifying the subtraction signal with controllable gain, and a low pass filter for providing substantial de-emphasis of the high frequency components of the amplified subtraction signal relative to the low frequency components thereof to produce a noise-reduced output signal; a second feedback signal path connected to receive the output signal from the low pass filter and including a second low pass filter for providing minor de-emphasis of the high frequency components relative to the low frequency components of the output signal; a subtracting circuit for subtracting the output of the second low pass filter from an input information signal; and a gain control circuit for varying the gain of the variable gain amplifier in accordance with the level of the input information signal so that the gain increases for increasing signal levels of the input information signal.

REFERENCES:
patent: 3873945 (1975-03-01), Muraoka
patent: 4035739 (1977-07-01), Dickopp et al.
patent: 4145664 (1979-03-01), Takaoka et al.
patent: 4215431 (1980-07-01), Nady

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