Television – Image signal processing circuitry specific to television – Noise or undesired signal reduction
Patent
1995-12-22
1998-03-24
Kostak, Victor R.
Television
Image signal processing circuitry specific to television
Noise or undesired signal reduction
348725, 375346, H04N 521
Patent
active
057318484
ABSTRACT:
In a radio receiver for receiving vestigial sideband (VSB) signals including symbol codes descriptive of digital signals, HDTV signals being exemplary of such VSB signals, a tuner provides for selecting one of channels at different locations in a frequency band used for transmitting such VSB signals. The tuner also includes mixers for performing plural conversion of the selected channel to a final intermediate-frequency signal, which is digitized by an analog-to-digital converter. A phase tracker, operative on narrow-bandpass filtered portions of the digitized final intermediate-frequency signal centering on its carrier frequency, suppresses an imaginary portion of the final intermediate-frequency signal, arising from multipath distortion or from phase incoherency in local oscillations used during frequency conversion. A digital controlled oscillator in the phase tracker supplies digital descriptions of the carrier wave for the final intermediate-frequency signal to a synchronous detector, which synchronous detector detects the real portion of the digitized final intermediate-frequency signal in accordance with those digital descriptions of the carrier wave. The phase tracker generates the real and imaginary portions of the digitized final intermediate-frequency signal using a pair of all-pass digital filters, which exhibit a constant .pi./2 difference in phase response for the digitized bandpass signals and have finite impulse responses.
REFERENCES:
patent: 5331416 (1994-07-01), Patel et al.
patent: 5483292 (1996-01-01), Ko
patent: 5532755 (1996-07-01), Patel et al.
patent: 5548617 (1996-08-01), Patel et al.
Limberg Allen LeRoy
Patel C. B.
Kostak Victor R.
Samsung Electronics Co,. Ltd.
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