System for converting aspect ratio of video signal having freque

Details System for converting aspect ratio of video signal having freque System for converting aspect ratio of video signal having freque

1997-09-19

1998-06-09

Powell, Mark R.

Television

Format conversion

Conversion between standards with different aspect ratios

348556, 348704, H04N 701, H04N 3223, H04N 546

Patent

active

057642974

ABSTRACT:
A signal processing circuit achieves a wide display mode without switching on and off an S correction in a horizontal deflecting system, and includes digital memories 16a, 16b and 16c for receiving a luminance signal Y, a color difference signal B-Y and a color difference signal R-Y. The writing operation of each digital memory is controlled by a sampling clock f.sub.CW of a write control circuit 18, and the reading operation of each digital memory is controlled by a sampling clock f.sub.CR of a read control circuit 19. A clock oscillator 24 of the read control circuit 19 produces the sampling clock f.sub.CR whose frequency is varied in accordance with a modulation voltage of a modulation voltage generator 31 in each line interval.

REFERENCES:
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patent: 4605952 (1986-08-01), Powers
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patent: 5223936 (1993-06-01), Van Der Voort et al.
patent: 5231490 (1993-07-01), Park
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patent: 5323235 (1994-06-01), Tonomura et al.
patent: 5345272 (1994-09-01), Ersoz et al.
patent: 5436669 (1995-07-01), Baba et al.

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