Television – Format conversion – Conversion between standards with different aspect ratios
Patent
1994-03-17
1996-03-05
Kostak, Victor R.
Television
Format conversion
Conversion between standards with different aspect ratios
348441, 348913, H04N 701, H04N 546
Patent
active
054971985
ABSTRACT:
A high definition television signal conversion circuit using a side cut mode or a letter box mode. The conversion circuit using the side cut mode comprises an A/D converter for converting a high definition television signal into a digital signal at a first sampling frequency, a line filtering circuit for performing a vertical interpolation of the digital signal from the A/D converter, a line decimation circuit for performing a vertical decimation of output data from the line filtering circuit, a horizontal filtering circuit for performing a horizontal interpolation of output data from the line decimation circuit, a horizontal decimation circuit for performing a horizontal decimation of output data from the horizontal filtering circuit, a memory device for storing output data from the horizontal decimation circuit in response to a write clock and outputting the stored data in response to a read clock, the read clock being determined according to a scanning mode, a D/A converter for converting output data from the memory device into an analog signal at a second sampling frequency, the second sampling frequency being determined according to the scanning mode, and a switch being turned on/off according to the scanning mode to control the data output from the memory device.
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Schreiber, William F., "6-MHz Single-Channel HDTV Signals", HDTV Symposium, Ottawa, Oct. 1987.
Goldstar Co. Ltd.
Kostak Victor R.
Metjahic Safet
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