Pattern detection circuitry

Details Pattern detection circuitry Pattern detection circuitry

2008-03-12

2011-12-20

Nguyen, Dao H (Department: 2818)

Electrical audio signal processing systems and devices

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Reexamination Certificate

active

08081770

ABSTRACT:
A pattern detection circuit detects a pattern in a received bit stream, for example a repetitive 8-bit silence pattern in a stream of digital audio data. Summing circuitry forms during first alternate time periods a sum of a first sequence comprising a predetermined number of alternate bits in the bit stream; and forms during second alternate time periods an inverse of a sum of a second sequence comprising the predetermined number of alternate bits in the bit stream. It is then determined whether successive sums formed by the summing circuitry are equal.

REFERENCES:
patent: 5369791 (1994-11-01), Asghar et al.
patent: 5889483 (1999-03-01), Tagami et al.
patent: 6047036 (2000-04-01), Schnizlein

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