Automatic television signal detector to differentiate NTSC signa

Details Automatic television signal detector to differentiate NTSC signa Automatic television signal detector to differentiate NTSC signa

1994-02-18

1996-09-17

Metjahic, Safet

Television

Basic receiver with additional function

Multimode

348555, H04N 546, H04N 5455

Patent

active

055573371

ABSTRACT:
An incoming television signal to a television receiver is switched to either NTSC (National Television Systems Committee) processing circuitry (130) or ATV (Advanced Television) processing circuitry (140) as determined from power measurements in each of two separate sub-bands of the power spectrum of the incoming signal. The first power measurement is obtained from a sub-band (204) wherein the NTSC power spectrum has significant spectral energy, whereas the second power measurement is obtained from another sub-band (205) wherein the NTSC power spectrum has minimal spectral energy. If the first measurement exceeds the second measurement by a prescribed value, the television signal is processed by the NTSC circuitry; otherwise, the ATV circuitry effects processing of the incoming signal.

REFERENCES:
patent: 5132793 (1992-07-01), Hirahata et al.
patent: 5283653 (1994-02-01), Citta
patent: 5361099 (1994-11-01), Kim
"Advanced Digital Television", System Description Jan. 20, 1992, David Sarnoff Research Center and Philips Labs., pp. 30 and 63.

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