System for recording and reproducing picture signals into which

Details System for recording and reproducing picture signals into which System for recording and reproducing picture signals into which

1993-01-21

1994-06-07

Chin, Tommy P.

Facsimile and static presentation processing

Facsimile

Recording apparatus

358320, 358335, 358312, 360 331, H04N 576, H04N 979

Patent

active

053194667

ABSTRACT:
In a video recorder (1) for the recording and reproduction of picture signals in standard-play modes and long-play modes a reconverted picture color signal supplied by a frequency-conversion stage (70) is passed through a delay device (84) having a delay of one line period in order to compensate for reproduction-dependent time errors during multi-speed reproduction of a long-play recording. In such a video recorder (1) a rectangular detection signal of half the line frequency is supplied to an output (76) of a phase detection stage (73) which detects the phase of the burst signal in the reconverted picture color signal, which detection signal is applied, via a connection (91), to a modulator (36) for the modulation of non-modulated character signals as a control signal (S2) for the modulator (36), which generates modulated character signals suitable for insertion into the reproduced picture signals. The connection (91) includes a switching device (93) which enables a further delay device (94) having a delay of one line period to be included in the connection (91) in the case of multi-speed reproduction of a long-play recording by the video recorder (1), as a result of which the control signal (S2) is delayed by the same time as the picture color signal during such a reproduction mode, which ensures that the picture color signal and the character color signal always remain locked to each other in the same way in all the modes of operation.

REFERENCES:
patent: 5051846 (1991-09-01), Tsushima et al.
patent: 5132807 (1992-07-01), Takimoto et al.

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