Separation correction method and apparatus for plural channel tr

Details Separation correction method and apparatus for plural channel tr Separation correction method and apparatus for plural channel tr

1982-03-24

1984-05-29

Hickey, R. J.

Electrical audio signal processing systems and devices

Binaural and stereophonic

Broadcast or multiplex stereo

381 16, H04H 500

Patent

active

044519273

ABSTRACT:
Apparatus is disclosed for use in improving the separation between the individual channels of a plural channel communication system such as a stereo AM radio broadcasting system. The separation corrections are made to the baseband signals. Two sources (14, 16) provide input signals to a matrix circuit (18) which generates sum and difference signals therefrom. A circuit (44) adjusts the phase of the difference signal relative to the sum signal. The circuit (44) includes phase shifting circuits (50, 52) which provide two difference signals phase shifted by ninety degrees relative to one another. The two signals are combined in a signal adder (54). The degree of phase shift provided by the circuit (44) is selectively adjusted by varying the gain of gain circuits (46, 48) included in the paths of the two difference signals. Means (42, 44) are included for varying the gains of the input signals to the difference signal. The gain factors are frequency dependent in some embodiments.

REFERENCES:
patent: 3087995 (1963-04-01), Hellstrom
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patent: 3528037 (1970-09-01), Yamazaki
patent: 4194088 (1980-03-01), Streeter
patent: 4194154 (1980-03-01), Kahn
patent: 4208547 (1980-06-01), Simeau
patent: 4211978 (1980-07-01), Takahashi
patent: 4225751 (1980-09-01), Hershberger
Comments of Motorola, Inc. filed with the FCC in response to Notice of Proposed Rulemaking-pp. II-3 to II-13.

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