Pulse or digital communications – Synchronizers – Phase displacement – slip or jitter correction
Patent
1992-06-12
1995-07-25
Chin, Stephen
Pulse or digital communications
Synchronizers
Phase displacement, slip or jitter correction
375373, 381 77, 331 2, H04L 700, H04L 2536, H04L 2540
Patent
active
054369436
ABSTRACT:
A digital audio signal processing circuit for eliminating the amplitude and phase components of logic induced modulation from a left right clock signal, a bit clock signal and digital data bits generated by a digital signal processor within a compact disk player. The digital audio signal processing circuit includes a trio of optical couplers for removing the amplitude component of logic induced modulation from the left right clock signal, the bit clock signal and the digital data bits; a clock circuit for generating a system clock signal and a trio of D Flip-Flops for removing the phase component of logic induced modulation from the left right clock signal, the bit clock signal and the digital data bits and a digital to analog converter for separating the data bits into left channel data bits and right channel data bits and for converting the left channel data bits into a first analog signal and the right channel data bits into a second analog signal for use by speakers or the like to provide stereo sound. An isolated power supply provides both analog and digital voltages to the electronic elements of digital audio signal processing circuit.
REFERENCES:
patent: 5266908 (1993-11-01), Koulopoulos et al.
Meitner et al., "Time Distortions Within Digital Audio Equipment Due to Igrated Circuit Logic Induced Modulation Products", Audio Engineering Society, 91st Convention, Oct. 1991.
Chin Stephen
Kalmbaugh David
Luther William
Sliwka Melvin J.
The United States of America as represented by the Secretary of
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