Audio encoder for use with more than one decoder each having dif

Details Audio encoder for use with more than one decoder each having dif Audio encoder for use with more than one decoder each having dif

1987-08-07

1989-03-21

Sikes, William L.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Including signal modification

369 54, 358336, 360 27, G11B 509, G11B 502, H04N 594

Patent

active

048150681

ABSTRACT:
A "hybrid" encoder has a characteristic action suitable for substantially full complementary playback in an audio signal transmission or recording system using decoders designed for one type complementary encode/decode system while permitting compatible decoding with decoders designed for use with another type complementary encode/decode system, or playback without any special decoders at all. The hybrid encoder is a series or parallel arrangement of two encoders that are modifications of standard encoders used in the two systems. In the preferred embodiments the two systems are A-type noise reduction and spectral recording. A variable degree of hybrid encoding is provided by varying the characteristic controlling circuit parameters in the two encoders, or in a preferred embodiment, by providing a variable combining arrangement that selects selects from the outputs of a hybrid encoder and an unmodified encoder (spectral recording).

REFERENCES:
patent: 4101849 (1978-07-01), Blackmer
patent: 4136314 (1979-01-01), Blackmer et al.
patent: 4433347 (1984-02-01), Sugiyama
patent: 4490691 (1984-12-01), Dolby
patent: 4641204 (1987-02-01), Sugiyama
"A Noise Reduction System for Consumer Applications" by Dolby, Audio Engr. Society, New York, Oct. 1970.
"Dolby B-Type Noise Reduction System" by Berkovitz et al., Audio, Sep.-Oct. 1973.
"A 20 db Audio Noise Reduction System for Consumer Applications" by Dolby, J. Audio Eng. Soc., vol. 31, No. 3, Mar. 1983, pp. 98-113.
"Optimum Use of Noise Reduction in FM Broadcasting" by Dolby, J. Audio Eng. Soc., vol. 21, No. 5, Jun. 1973, pp. 357-362.
"Dolby B-Type Noise Reduction for FM Broadcasts"; by D. P. Robinson, J. Audio Eng. Soc., vol. 21, No. 5, Jun. 1973, pp. 351-356.

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