Facsimile and static presentation processing – Facsimile – Recording apparatus
Patent
1989-02-06
1991-10-29
Envall, Jr., Roy N.
Facsimile and static presentation processing
Facsimile
Recording apparatus
358310, 358320, 358328, H04N 979
Patent
active
050620045
ABSTRACT:
An improved digital video signal processing circuit, for common use in the recording and playback modes of a video tape recorder, has a chrominance processing circuit for processing the chrominance signal of the input digital composite video signal through a first baseband mixer, a chrominance processor, and a second baseband mixer, and a luminance processing circuit for frequency modulating/demodulating the luminance signal, so that the processed chrominance and luminance signals can be added together to form an output digital composite video signal. The improved digital circuit automatically regulates the frequencies of the mixing signals for both mixers using line stepping signals obtained from a horizontal line sweep generator in the luminance processing circuit. The possibility of phase errors is eliminated, and quadrature errors in the chrominance signal are prevented.
REFERENCES:
patent: 4757390 (1988-07-01), Mehrgardt et al.
patent: 4807048 (1989-02-01), Yasuda
IRE Transactions on Electronic Computers, 9/59, "The Cordic Trigometric Computing Technique", Jack E. Volder, pp. 330-334.
IEEE Transactions on Consumer Electronics CE-32 (1986), Aug., No. 3, "Digital Video Signal Processing in Home VTRs", Shiro Kato et al.
"Digitaler Signalprozessor fur Videorecorder", by Sonke Mehrgardt at Intermetall, Freiburg, Germany, pp. 718-731, 12.Jahrestagung der FKTG.
Desor Hans-Jurgen
Winterer Martin
Deutsche ITT Industries GmbH
Envall Jr. Roy N.
Peterson Thomas L.
Tran Thai
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