Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1983-11-09
1986-11-18
Chin, Tommy P.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
3581931, H04N 544, H04N 550
Patent
active
046239260
ABSTRACT:
A television synchronous receiver includes: a voltage controlled oscillator; a 90.degree. phase shifter for shifting the phase of the voltage controlled oscillator output by 90.degree.; first and second synchronous detectors for synchronously detecting in-phase and quadrature components of a video carrier signal using the voltage controlled oscillator output and the 90.degree. phase shifter output as synchronous carriers; first and second low-pass filters for filtering low frequency components of the first and second synchronous detector outputs within frequency ranges covering the base band of video and sound intermediate frequency signals; a phase detector for detecting the phase difference between the video carrier signal and the voltage controlled oscillator output from the first and second low-pass filter outputs; a circuit for feeding the phase detector output back to the voltage controlled oscillator; a signal amplifier for amplifying the first low-pass filter output; a signal converter for converting the signal amplifier output into a discrete-time signal; a clock generator for generating clock signals under the control of either television synchronizing signals or color burst signals separated from the signal amplifier output; a discrete-time system for processing the discrete-time signals and a signal reverse converter for reverse converting the discrete-time system output into continuous time signals. The receiver minimizes interference from an adjacent lower channel through the operation of the discrete-time system and generates video signals from the reverse converter without needing a varactor and inductor tuning circuit at the high frequency input section for removing adjacent lower channel signals.
REFERENCES:
patent: 3688019 (1972-08-01), Weitzsch et al.
patent: 4461035 (1984-07-01), Sakamoto
patent: 4524389 (1985-06-01), Isobe
R. Deubert, "Feature IC's for Digivision TV Sets", 1983, Freiberg, West Germany, pp. 237-241.
S. Haykin, "Communication Systems," Second Edition, Jun. 1983, New York, pp. 132-133.
O. Limann, "Fernsehtechnik Ohne Ballast", 1983, pp. 55-57 (no Translation).
V. Jan Davidse, "Synchrondemodulation von Fernschsignalen", 1969, pp. 525-530 (no Translation).
P. Draheim, "Digitaltechnik im Fernsehgerat", 1982, pp. 96-98 (no Translation).
Teil 1, "Phasenregelkreis" (PLL), Grundschaltengen der Elektronik, Funkschau-Arbeitsblatter, pp. 61-62, 67-68, 1983.
Michael Jacobse, "Adaptive Techniken bei der Digitalen Videosignalverarbeitung in Farbfernsehempfangern", pp. 245-250.
Robert Suhrmann, "Neue Fernsehempfanger-Konzeptionen", 1983, pp. 329-334.
Chin Tommy P.
Matsushita Electric - Industrial Co., Ltd.
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