Compander system having limiter in compressor and expander

Details Compander system having limiter in compressor and expander Compander system having limiter in compressor and expander

1977-10-21

1980-09-23

Gensler, Paul L.

Wave transmission lines and networks

Amplitude compression and expansion systems

307264, 328169, 330 51, 330 86, 330126, 330282, H04B 164, H03G 700

Patent

active

042245818

ABSTRACT:
A noise reduction system having an encoder which compresses the dynamic range of an analog audio signal, a transmission medium coupled to the encoder, and a decoder coupled to the transmission medium for expanding and thereby restoring the dynamic range of the compressed analog audio signal. The encoder includes a voltage controlled amplifier (VCA) receiving the audio signal, a high-pass filter also coupled to the analog audio signal, a circuit for obtaining a difference between the outputs of the VCA and the high-pass filter, weighting and level sensing circuits coupled to the encoder output for sensing the level of the compressed analog audio signal, and a limiter circuit coupled to the output of the weighting and level sensing circuits and producing a control voltage applied to the VCA control input in such a manner that the ratio of the gain of the VCA and the gain of the high-pass filter at the pass band thereof does not become less than one. The decoder includes circuits similar to those of the encoder and exhibits a transfer function substantially inverse to the encoder transfer function, with the controlling voltage applied to the decoder VCA such that the loop gain in the pass band of the high-pass filter does not become more than one.

REFERENCES:
patent: 3757254 (1973-09-01), Takahashi et al.
patent: 3969680 (1976-07-01), Wermuth
patent: 4072914 (1978-02-01), Haramoto et al.

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