Wave transmission lines and networks – Amplitude compression and expansion systems
Patent
1978-08-30
1981-07-28
Gensler, Paul L.
Wave transmission lines and networks
Amplitude compression and expansion systems
330 85, 330126, 330132, H04B 164
Patent
active
042812950
ABSTRACT:
A frequency region split type noise reducing apparatus, comprising a compressor and an expander; the compressor (or the expander) including a plurality of frequency region splitting filters for splitting the frequency range of the signal into a plurality of frequency regions, a plurality of level sensors for detecting the levels of the signals in the respective frequency regions split by the plurality of filters, a plurality of voltage controlled amlifiers responsive to the level detected outputs of the corresponding level sensors for linearly compressing (or expanding) in terms of a logarithmic scale the dynamic range of the signal, and an adder for adding the outputs as compressed by the voltage controlled amplifiers for providing a composite signal, and the expander (or the compressor) including an amplifier and a switch circuit for connecting the compressor (or expander) to the amplifier to form a negative feedback circuit, whereby the expander (or the compressor) is implemented by a negative feedback amplifier including the amplifier and the negative feedback circuit.
REFERENCES:
patent: 3729693 (1973-04-01), Dolby
patent: 3815039 (1974-06-01), Fujisawa et al.
patent: 3902131 (1975-08-01), Dorren
patent: 3969680 (1976-07-01), Wermuth
patent: 4114115 (1978-09-01), Minnis
patent: 4162462 (1979-07-01), Endoh et al.
Asano Takehiko
Nishimura Satoshi
Sato Ken'ichi
Shimizu Tetsuo
Gensler Paul L.
Sanyo Electric Co,. Ltd.
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