Television – Format conversion – Changing number of fields for standard conversion
Patent
1995-02-01
1998-03-31
Peng, John K.
Television
Format conversion
Changing number of fields for standard conversion
348443, 348447, 348448, 348911, H04N 701, H04N 1120
Patent
active
057344353
ABSTRACT:
A method for converting between relatively dose field rates of perhaps 60 Hz and 59.94 Hz, monitors the phase difference between input and output field rates. Initially, output fields are created by synchronising input fields. As the measured phase passes a threshold, the method switches to interpolation mode for a short, fixed interval and then returns to synchronization. The method offers much of the sharpness associated with simple synchronization but avoids the visible discontinuities of field drops or repeats.
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H. Sakata et al, NHK Technical Monograph, No. 17, Mar. 1971, "Television Standards Converter", pp. 3-37.
Dabner Steve
Weston Martin
Wilson Peter
Miller John W.
Peng John K.
Snell & Wilcox Ltd.
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