Digital television receiver converting vestigial-sideband signals to double-sideband AM signals before demodulation
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United States of America Patent
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Aug 3, 2004
Grant Date -
N/A
app pub date -
May 11, 2000
filing date -
May 11, 2000
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A vestigial-sideband (VSB) signal is down-converted to generate a VSB signal including a carrier frequency offset from zero frequency by an amount greater than the bandwidth of the VSB signal. The carrier of this final I-F signal has a carrier offset from zero-frequency, which carrier offset exceeds the highest modulating frequency of the VSB signal and is adjusted to a prescribed carrier offset value. The down-converted VSB signal is digitized to generate a digital multiplicand signal for a digital multiplier circuit. The digital multiplier circuit is supplied a digital multiplier signal descriptive of a system function composed of a constant term and a second harmonic of the carrier frequency offset from zero frequency. Digital product signal from the digital multiplier circuit is descriptive of a double-sideband amplitude-modulation final I-F signal in the digital regime, which DSB AM final I-F signal is subsequently detected to generate a baseband demodulation result.
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