Television – Basic receiver with additional function – Multimode
Patent
1995-01-19
1996-04-23
Groody, James J.
Television
Basic receiver with additional function
Multimode
348549, H04N 700
Patent
active
055108474
ABSTRACT:
The object of the present invention is to use signal decoding circuits for a first generation EDTV signal and a second generation EDTV signal in common and to suppress an increase of circuit scale.
An EDTV signal decoding apparatus of the present invention is constructed with a cascade connection of a first A/D converter, a first signal processing circuit, a first D/A converter, a second A/D converter, a second signal processing circuit and a second D/A converter. The first group composed of the first A/D converter, the first signal processing circuit and the first D/A converter are driven by a clock signal synchronizing with a color burst signal. The second group composed of the second A/D converter, the second signal processing circuit and the second D/A converter are driven by a clock signal synchronizing with a horizontal sync signal.
At the first signal processing circuit, a composite video signal is inputted and when a signal discrimination and control circuit judges that a vertical high frequency band helper signal is not multiplexed in upper/lower non-picture periods with the input signal or a vertical high frequency band helper signal is multiplexed in upper/lower non-picture periods but the input signal is in a picture period, a demodulator input signal selector, a luminance signal output selector and I and Q signal output selectors are controlled to be the upper positions and a chrominance signal separated at a three dimensional adaptive type Y/C separator is demodulated at a color demodulator. A luminance signal separated at the three dimensional adaptive type Y/C separator is outputted from a luminance signal output terminal and color signals I and Q demodulated at the color demodulator are outputted from I and Q signal output terminals, respectively.
REFERENCES:
patent: 5353065 (1994-10-01), Katsumata et al.
patent: 5387939 (1995-02-01), Naimpally
Matsuura Ryuji
Nio Yutaka
Groody James J.
Matsushita Electric - Industrial Co., Ltd.
West Nina N.
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