Processor for video signals obtained from an information carrier

Details Processor for video signals obtained from an information carrier Processor for video signals obtained from an information carrier

1988-04-07

1989-09-05

McElheny, Jr., Donald

Facsimile and static presentation processing

Facsimile

Recording apparatus

358316, 358320, H04N 988, H04N 989

Patent

active

048644226

ABSTRACT:
A color television signal processor for signals reproduced from magnetic tape converts the signals to digital form at a sampling rate substantially equal to three times the color carrier frequency, incorporates a timing system that locks the sampling rate into step with the picked up synchronizing signals in which a digital pulse generator of high stability is utilized having other possible applications, an additional demodulator separately switched is used to recover synchronizing signals for the first line of each segment, a ramp signal is provided during the blanking interval to assist in accurate timing of the sampling pulses, velocity errors are corrected for each line by a measurement of the period of a previous line and discontinuities (jumps in alternating directions) related to the switching between heads are also measured and compensated for. A more economical scheme for dealing with signal dropouts makes use of a digital low-pass filter for separating luminance and chrominance signals for dropout compensastion that can be left in circuit without deterioration of picture quality during periods in which no dropouts are detected.

REFERENCES:
patent: 4054903 (1977-10-01), Ninomiya
patent: 4199780 (1980-04-01), Taylor
patent: 4287529 (1981-09-01), Tatami et al.
patent: 4591925 (1986-05-01), Trytko
patent: 4680658 (1987-07-01), Tatami
patent: 4716454 (1987-12-01), Oldershaw et al.
patent: 4733312 (1988-03-01), Morimoto

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