HDTV signal receiver with imaginary-sample-presence detector for

Details HDTV signal receiver with imaginary-sample-presence detector for HDTV signal receiver with imaginary-sample-presence detector for

1994-06-28

1996-04-09

Kostak, Victor R.

Television

Receiver circuitry

348726, 375261, H04N 5455

Patent

active

055066364

ABSTRACT:
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. The final IF signal from the tuner is digitized for application to in-phase and quadrature QAM synchronous detectors and to in-phase and quadrature VSB synchronous detectors. The carrier frequencies of the QAM and VSB final IF signals are regulated to be submultiples of symbol frequency by applying automatic frequency and phase control signals developed in the digital circuitry to a local oscillator of the tuner. The mean average energy in the output samples of the quadrature VSB synchronous detector is sensed for automatically switching the radio receiver reception mode, for operation in a VSB HDTV signal reception mode when the mean average energy is below a threshold level, and for operation in a QAM signal reception mode when the mean average energy is not below the threshold level.

REFERENCES:
patent: 4730345 (1988-03-01), Reeve, III
patent: 4878228 (1989-10-01), Takahashi
patent: 5087975 (1992-02-01), Citta et al.
patent: 5115454 (1992-05-01), Kucar
patent: 5264937 (1993-11-01), Christopher
patent: 5283653 (1994-02-01), Citta
patent: 5315617 (1994-05-01), Guida et al.

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