Patent
Automatic VSB/QAM modulation recognition method and apparatus
Carl G. Scarpa
- 13 Dec 1994
28
TL;DR: In this paper, a narrow digital passband filter is used to sweep across the frequency region of a received HDTV signal where a VSB pilot tone would be located if the received signal is VSB signal.
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Abstract: Methods and apparatus for automaticly distinguishing between QAM and VSB modulated signals and, for implementing an automatic VSB/QAM modulation recognition circuit are described. In accordance with various described embodiments, a narrow digital passband filter is used to sweep across the frequency region of a received HDTV signal where a VSB pilot tone would be located if the received signal is a VSB signal. The power of the filtered HDTV signal is estimated and compared to various preselected thresholds. If a power threshold value indicative of the presence of a VSB pilot tone is exceeded VSB is declared present. If no VSB pilot tone is detected, as indicated by the measured signal power levels, receipt of a QAM signal is declared. Various methods of insuring that transient changes in a received signal do not result in an erroneous decision with regard to the type of demodulation to perform are also described.
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Citations
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Patent
HDTV signal receiver with imaginary-sample-presence detector for QAM/VSB mode selection
Chandrakant B. Patel,Allen LeRoy Limberg +1 more
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TL;DR: In this article, a radio receiver for receiving a selected digital HDTV signal, irrespective of whether it is a complex-amplitude-modulation (QAM) or a vestigial sideband (VSB) signal, using the same tuner, is digitized for application to in-phase and quadrature QAM synchronous detectors and to in phase-independent VSB detectors.
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Patent
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Patent
Automatic television signal detector to differentiate NTSC signals from HDJV/AJV signals
Carl G. Scarpa
- 18 Feb 1994
TL;DR: In this article, an incoming television signal to a television receiver is switched to either NTSC (National Television Systems Committee) 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.
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