Filter arrangement for an audio companding system

Details Filter arrangement for an audio companding system Filter arrangement for an audio companding system

1984-03-30

1987-11-03

Isen, Forester W.

Electrical audio signal processing systems and devices

Binaural and stereophonic

Broadcast or multiplex stereo

381106, 358144, 333 14, H04H 500, H03G 700

Patent

active

047047267

ABSTRACT:
A companding system for a television audio apparatus includes a compressor and an expander for stereo difference signals. The compressor provides variable preemphasis of high frequency signal components and the expander provides complementary variable deemphasis. At the receiver, unwanted signals are generated by a mixer that demodulates the stereo difference signal. The unwanted signals can cause mistracking of the expander relative to that of the compressor. A filter to eliminate the effect of these unwanted signals is placed in the expander control circuit, rather than the difference signal path. This eliminates the need and expense of an equalizing filter in the sum signal path.

REFERENCES:
patent: 4048654 (1977-09-01), Wegner
patent: 4272788 (1981-06-01), Ogita
patent: 4356510 (1982-10-01), Nakayawa
patent: 4498055 (1985-02-01), Dolby
patent: 4577226 (1986-03-01), Avins
Electronic Industries Association, "Compandor Complexity Analysis", Dec. 1983.
Compandor Complexity Analyses published by Broadcast Television Systems Committee of the Electronic Industries Association, Dec. 12, 1983.
Supplement to Multichannel Television Sound Report, vol. IA, IIA, dated Dec. 5, 1983, pp. 19-23.

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