Noise reduction system having series connected low and high freq

Details Noise reduction system having series connected low and high freq Noise reduction system having series connected low and high freq

1981-04-23

1982-12-07

Gensler, Paul L.

Wave transmission lines and networks

Amplitude compression and expansion systems

307271, H04B 164

Patent

active

043630073

ABSTRACT:
In a noise reduction system including a compressor and an expander having a complementary frequency response characteristic to the frequency response characteristic of the compressor, the compressor includes a high frequency emphasis variable frequency filter and a low frequency emphasis variable gain filter which are connected in a series circuit between input and output terminals and which respectively vary their parameters in response to the respective high and low frequency components of the compressor output. The expander includes a high frequency de-emphasis variable frequency filter and a low frequency de-emphasis variable gain filter which are connected in a series circuit between input and output terminals and which respectively vary their parameters in response to the respective high and low frequency components of the expander input.

REFERENCES:
patent: 3795876 (1974-03-01), Takahashi et al.
patent: 4200889 (1980-04-01), Strobele

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