Television – Image signal processing circuitry specific to television – Chrominance signal demodulator
Patent
1994-02-23
1995-12-05
Kostak, Victor R.
Television
Image signal processing circuitry specific to television
Chrominance signal demodulator
348727, H04N 966, H04N 5455
Patent
active
054733880
ABSTRACT:
A signal demodulator apparatus comprises: an input terminal (11) for inputting an external signal; a delay line (12) connected to the input terminal, for outputting a first delay signal obtained by delaying the external signal by a predetermined time; a phase corrector (13) responsive to the first delay signal outputted by the delay line, for correcting phase of the first delay signal on the basis of a phase difference detection signal and outputting the first phase-corrected delay signal as a second delay signal; and a phase difference detector (16, 15, 19, 20) for detecting a phase difference between the second delay signal outputted by said phase corrector and the external signal inputted through the input terminal and for outputting the phase difference detection signal to the phase corrector to correct the phase difference to a predetermined value. Whenever the delay time of the delay signal disperses due to a manufacturing error or a change with the lapse of time of the delay line (12), it is possible to automatically correct an offset of the phase difference from a normal value.
REFERENCES:
patent: 3715469 (1973-02-01), Tamaru et al.
patent: 3899740 (1975-08-01), Unkauf et al.
patent: 4799212 (1989-01-01), Mehrgardt
patent: 4918393 (1990-04-01), Yokosuka et al.
Special Edition of Telefunken-Zeitung, Jun. 1966, Selected Papers II, PAL a Variant of the NTSC Colour Television System, Dr. W. Bruch, pp. 1.7-1.9, "PAL With Averaging Through A Delay Line (Standard-PAL Decoder)".
Takaki Kazuki
Wada Yoshio
Kabushiki Kaisha Toshiba
Kostak Victor R.
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