Digital stereo recovery circuitry and method for radio...

Details Digital stereo recovery circuitry and method for radio... Digital stereo recovery circuitry and method for radio...

2007-02-20

2007-02-20

Grier, Laura A. (Department: 2615)

Electrical audio signal processing systems and devices

Binaural and stereophonic

Broadcast or multiplex stereo

C381S003000, C455S260000, C331S182000, C375S362000

Reexamination Certificate

active

10742171

ABSTRACT:
Stereo recovery circuitry for a digital receiver is disclosed that provides increased accuracy and efficiency in recovering stereo signal information from transmitted stereo signals. The stereo decoder includes a digitally controlled oscillator that recovers a pilot tone signal from transmitted stereo signal information. By processing demodulated stereo signals on the digital side and digitally controlling the oscillator, the stereo decoder has increased efficiency and accuracy. In one embodiment, the oscillator may be a phase-locked-loop having a loop filter and an amplitude stabilized tunable resonator. Additional circuitry is disclosed for utilizing the pilot tone signal to recover left and right channel signal information from the demodulated stereo signals.

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patent: 6694026 (2004-02-01), Green

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