Television – Format conversion – Changing number of lines for standard conversion
Patent
1998-06-10
2000-02-01
Kostak, Victor R.
Television
Format conversion
Changing number of lines for standard conversion
348536, H04N 701
Patent
active
060209275
ABSTRACT:
A video signal converter converts a first video signal into a second video signal by changing the number of scanning lines. A horizontal pulse synchronized with the first video signal is fed into a PLL circuit, which generates a first clock signal synchronized with the horizontal pulse. The first video signal undergoes A/D conversion by sampling with the first clock signal. The converter receives a first digital video signal which has undergone the A/D conversion, the first clock signal, the horizontal pulse, and a vertical pulse synchronized with the first video signal, and thus changes a number of scanning lines of the first video signal. The converter, next, writes a second digital video signal into a memory by synchronizing the first clock signal. Then, the second digital video signal is read out from the memory by synchronizing a second clock signal generated from another clock signal generator, and is outputted as a third digital video signal, which is converted by a D/A converter into a second video signal having a desirable number of scanning lines and being outputted without video distortion in the horizontal direction.
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Nio Yutaka
Tanaka Kazuhito
Kostak Victor R.
Matsushita Electric - Industrial Co., Ltd.
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