Chrominance signal demodulation apparatus

Details Chrominance signal demodulation apparatus Chrominance signal demodulation apparatus

2007-10-02

2007-10-02

Yenke, Brian P. (Department: 2622)

Television

Image signal processing circuitry specific to television

Chrominance signal demodulator

C348S639000, C348S640000, C348S641000, C348S662000, C348S727000

Reexamination Certificate

active

10983734

ABSTRACT:
An NTSC system chrominance signal demodulation apparatus is provided with a clock timing change circuit for burst-locking an input signal under the state where the phase is shifted by 90 degrees for every line, and phase axis rotation circuits for performing phase axis rotation, thereby to enable conversion of the phase axis of the burst signal. Therefore, demodulation of a PAL system chrominance signal can be carried out as well as demodulation of an NTSC system chrominance signal, and thereby demodulation of chrominance signals can be carried out using a common device regardless of the broadcast systems such as NTSC and PAL. Further, demodulation of chrominance signals can be carried out even under adverse conditions such as weak electric field or level compression of the burst signal.

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