Television – Basic receiver with additional function – Multimode
Patent
1993-10-08
1994-11-01
Groody, James J.
Television
Basic receiver with additional function
Multimode
348556, H04N 546
Patent
active
053610997
ABSTRACT:
A NTSC/HDTV community receiving system having a microcomputer, HDTV and NTSC tuners and NTSC and HDTV intermediate frequency detectors. The system includes an A/D converter for converting HDTV and NTSC intermediate frequency signals into digital signals and a demodulator for demodulating a NTSC frame color signal into an original state and demodulating the resultant digital HDTV signal from the A/D converter into a base band level state. A first comb filter removes a NTSC interference signal from the demodulated HDTV signal and extracts a NTSC line color signal from the resultant digital NTSC signal from the A/D converter, and a second comb filter extracts a motion coefficient, the NTSC frame color signal and a NTSC frame luminance signal from the resultant digital NTSC signal from the A/D converter and the NTSC line color signal from the first cob filter. A decoder extracts original HDTV color and luminance signals from the HDTV signal from the first comb filter, and a scan rate transformer line and pixel-interpolates the resultant NTSCI and NTSCQ color signals from the demodulator and the NTSC frame luminance signal from the second comb filter to match a scan rate of the NTSC signal to that of the HDTV signal. A display state controller controls display states of the NTSC and HDTV signals.
REFERENCES:
patent: 5065243 (1991-11-01), Katagui
patent: 5132793 (1992-07-01), Hirahata et al.
patent: 5146331 (1992-09-01), Tsuchida
patent: 5170256 (1992-12-01), Tabata
patent: 5173774 (1992-12-01), Bretl et al.
patent: 5283653 (1994-02-01), Citta
Goldstar Co. Ltd.
Groody James J.
Lee Michael H.
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