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US 4,736,238 AGranted
Fully digitized video signal reproducing apparatus
AssigneePioneer Electronic Corporation
InventorsYoshiaki Moriyama, Sumitaka Matsumura, Kaname Abe, Akihiro Ono, Kenji Yamagata, Toshio Gotoh
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Abstract
A digital television circuit in which the analog FM video signal is first digitized and all processing is performed digitally, including FM demodulation. Clocks at the subcarrier frequency and four times this frequency are synchronized with the horizontal synchronizing circuit or color burst signal.
Claims3
A video signal reproducing apparatus comprising:
- an analog-to-digital converter for converting an FM video signal into a digital signal;
- a first digital filter for extracting a video signal component necessary for detecting a video signal from an output of said analog-to-digital converter;
- an FM demodulating circuit for demodulating an output of said first digital filter;
- a second digital filter for extracting a base-band video signal component from an output of said FM demodulating circuit;
- a color signal source providing a clock signal synchronized with a horizontal synchronizing signal or a color burst signal contained in an output of said second digital filter;
- buffer memory for storing an output of said second digital filter by using said clock signal and for successively releasing information of the base band digital video signal component stored in said buffer memory in synchronism with a predetermined reference clock signal;
- and
- a digital-to-analog converter for converting the baseband digital video signal component released from said buffer memory into an analog signal.
5 more elements
Dependencies are inferred from the claim text.