Noise reduction in companding arrangements

Details Noise reduction in companding arrangements Noise reduction in companding arrangements

1984-12-19

1987-02-10

LaRoche, Eugene R.

Wave transmission lines and networks

Amplitude compression and expansion systems

333 16, 455 72, H04B 164

Patent

active

046425837

ABSTRACT:
In a companding arrangement, the presence of a tone in only one of the two transmission directions is detected. Upon such detection, for example during set-up of a telephone call via a satellite transmission channel, the tone is compressed or expanded, depending on its transmission direction, separately from the remainder of the signal using a second compander. Companding is thus effected using two companders operating at different amplitude levels, with a consequent noise level reduction. A single bandpass filter is used to separate the detected tone, switches being controlled by the tone detection to couple the bandpass filter selectively for operation in either transmission direction.

REFERENCES:
patent: 2986712 (1961-05-01), Hochrath
patent: 3510793 (1970-05-01), Barber
patent: 3895322 (1975-07-01), Stewart et al.
patent: 4253072 (1981-02-01), Fisher et al.
patent: 4337440 (1982-06-01), de Korte
patent: 4498060 (1985-02-01), Dolby

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