Stereo audio processing device for deriving auxiliary audio...

Electrical audio signal processing systems and devices – Binaural and stereophonic – Center channel

Reexamination Certificate

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Reexamination Certificate

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06870933

ABSTRACT:
An audio signal processing device is described for deriving auxiliary audio signals, such as audio direction sensing signals or a center audio signal from first and second audio signals through first and second filter paths, each of which comprises a first adaptive filter, and a first summing means is provided for coupled to the first adaptive filters for providing a summed audio signal at its summing output. Each filter path further comprises a second adaptive filter coupled to said summing output, whose respective adaptive filter coefficients are transferred to the first adaptive filters and are adapted in response to respective comparisons of the first and second audio signals with filtered sums of the first and second audio signals. Therewith correlated and uncorrelated parts of the input audio signals are processed effectively.

REFERENCES:
patent: 5528694 (1996-06-01), Van De Kerkhof et al.
patent: 6519344 (2003-02-01), Yajima et al.
patent: 06090500 (1994-03-01), None
Patent Abstracts of Japan, Yanagisawa Takaaki, “Sound Image Normal Position Controller,” Publication No. 06090500, Mar. 29, 1994, Application No. 04265538, Sep. 9, 1992.

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