Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1983-11-22
1985-01-29
Chin, Tommy P.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358144, 358198, 358904, 381 1, 381 17, 455207, 455209, 455214, H04N 562
Patent
active
044969791
ABSTRACT:
A processor providing high-quality audio signals from television sound channels by signal recovery using induced intermodulation between the picture carrier and the sound subcarrier signal. The resulting intermodulation products are filtered and the FM audio subcarrier is recovered and converted to the FM radio band. Subsequently the detected audio signal is enhanced by stereo synthesis and noise reduction systems, producing a high-quality reproduction of television audio signals with a minimum of distortion and noise, suitable for a full-range stereo system. The recovery of the audio subcarrier by inducing intermodulation between the signal carriers avoids the frequency shifts or phase noise induced by satellite and/or CATV translator circuits, in particular, the phase jitter of translating phase-lock loop (PLL) circuits. The converter is also applicable for use with VCR and other equipment to provide high-quality sound recovery.
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Kwok Sai W.
Yu Hong
Casat Technology, Inc.
Chin Tommy P.
Parker Michael D.
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