Video playback device capable of removing time base errors from

Details Video playback device capable of removing time base errors from Video playback device capable of removing time base errors from

1993-08-30

1995-10-24

Chin, Tommy P.

Facsimile and static presentation processing

Facsimile

Recording apparatus

360 362, 360 371, 360 103, 348497, H04N 595, H04N 578

Patent

active

054614872

ABSTRACT:
A time base correcting apparatus for removing time base errors from video signals in a video tape playback device which is operable in either a first normal or high speed operation mode or a second still motion or slow speed operation mode. In the first operation mode, first and second fields are reproduced in succession from successive tracks and in the second operation mode, the same field is reproduced at least twice in succession from the same track. The video signals are received and stored in a memory. First and second synchronizing signals corresponding to the first and second fields are alternately generated and include equalizing, vertical and horizontal sync pulses. Corrected first and second synchronizing signals are selectively generated during the second operation mode as a function of whether the second field or the first field is reproduced twice in succession. The first and second synchronizing signals are added to the first and second fields of video signals read out from the memory during the first operation mode; and during the second operation mode, when the first field is reproduced twice in succession, the first synchronizing signal and the corrected second synchronizing signal are added thereto, respectively, and when the second field is reproduced twice in succession, the second synchronizing signal and the corrected first synchronizing signal are added thereto.

REFERENCES:
patent: 4063284 (1917-12-01), Tatami
patent: 4437125 (1984-03-01), Yamamoto
patent: 4733312 (1988-03-01), Morimoto
patent: 4796123 (1989-01-01), Takeuchi et al.
patent: 5191434 (1993-03-01), Kim
patent: 5253118 (1993-10-01), Konno
patent: 5280396 (1994-01-01), Hamaguchi et al.

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