Television – Image signal processing circuitry specific to television – Noise or undesired signal reduction
Patent
1997-12-09
1999-06-01
Peng, John K.
Television
Image signal processing circuitry specific to television
Noise or undesired signal reduction
348607, 348473, 348424, 348723, H04N 5208, H04N 5213, H04N 521
Patent
active
059092530
ABSTRACT:
A method and apparatus for reducing video crosstalk in a data carrier located within a lower vestigial sideband (VSB) of a standard television signal. Specifically, an apparatus according to the invention comprises a single bandpass filter for conditioning a VSB television signal, and a frequency interleaver for spectrally adding the data carrier to the lower VSB of the standard VSB video signal. The filter removes removing video components from the lower VSB of a standard VSB video signal, including frequencies greater than the highest frequency nominally associated with the lower VSB of the standard television signal, illustratively 250 Khz above the nominal VSB bandedge. The filter also boosts frequencies in a spectral boost region within a passband for boosting region. The boosted frequencies comprise image frequencies associated with the non-VSB spectrum attenuated by the filter. The compensation is required to ensure that the above image frequencies are not over-attenuated by a standard television receiver Nyquist filter.
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National Association of Broadcasters (NAB) submission of Dec. 17, 1996 entitled "D-Channel Signal Specification".
National Association of Broadcasters (NAB) submission of Apr. 30, 1994 entitled Response to RFP "NTSC-Compatible Data Broadcasting Systems".
National Association of Broadcastiers (NAB) submission of Jul. 3, 1996 entitled "Description of D-Channel Implementations".
Abbott Liston
Jonnalagadda Krishnamurthy
Burke William J.
Peng John K.
Sajous Wesner
Sarnoff Corporation
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