Stereo decoder and method for processing pilot signal

Electrical audio signal processing systems and devices – Binaural and stereophonic – Broadcast or multiplex stereo

Reexamination Certificate

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Details

C381S003000, C381S006000, C381S014000, C381S015000, C381S016000, C455S205000, C455S208000

Reexamination Certificate

active

08045717

ABSTRACT:
A stereo decoder and a method therefor are provided. The stereo decoder receives a MPX signal from an FM demodulator, and comprises a first auto-calibration circuit, a band-pass filter, a second auto-calibration circuit, a slicer and a PLL circuit. The first auto-calibration circuit generates a first control signal. The band-pass filter generates the pilot signal by filtering the MPX signal with a center frequency set by the first control signal. The second auto-calibration circuit generates a second control signal. The slicer converts the pilot signal into a square wave signal. The PLL circuit comprises a voltage controlled oscillator for generating an oscillation frequency in response to the second control signal. The PLL circuit receives the square wave signal to generate the reference signal around the predetermined frequency in response to the oscillation frequency.

REFERENCES:
patent: 4493099 (1985-01-01), Schmidt
patent: 4821322 (1989-04-01), Bose
patent: 5202924 (1993-04-01), Richards, Jr.
patent: 5966400 (1999-10-01), Den Braber
patent: 2003/0225583 (2003-12-01), Fisher et al.
patent: 2006/0104398 (2006-05-01), Su et al.
patent: 1148297 (1997-04-01), None
patent: 0 977 388 (2000-02-01), None

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