Television – Image signal processing circuitry specific to television – Chrominance signal demodulator
Reexamination Certificate
2005-09-13
2005-09-13
Lee, Michael H. (Department: 2614)
Television
Image signal processing circuitry specific to television
Chrominance signal demodulator
C348S727000, C329S341000
Reexamination Certificate
active
06943847
ABSTRACT:
A SECAM decoder and an FM modulator therefor are disclosed, in which a demodulated color signal is provided to indicate deviations in the frequency of modulated color information from a nominal subcarrier frequency. The demodulator comprises numerator and denominator filters operating on the modulated color information, and a divider providing a ratio result by dividing the numerator filter output by the denominator filter output. The demodulator may include two sets of numerator and denominator filters offset in phase from one another, where one of the two sets is selectively employed in order to mitigate divide-by-zero problems. Also disclosed are methods for demodulating digitized FM color signals in a SECAM decoder.
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Demmer Walter
Renner Karl
Brady III W. James
Lee Michael H.
Moore J. Dennis
Telecky , Jr. Frederick J.
Texas Instruments Incorporated
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