Digital television receiver converting vestigial-sideband...

Pulse or digital communications – Receivers – Amplitude modulation

Reexamination Certificate

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Details

C329S356000, C329S357000, C455S204000

Reexamination Certificate

active

06950481

ABSTRACT:
A vestigial-sideband (VSB) signal is converted to a double-sideband amplitude-modulation signal having information that is subsequently detected in the double-sideband amplitude-modulation signal. A method for performing the conversion includes mixing the VSB signal with a first beat frequency different from a carrier frequency of the VSB signal, the first beat frequency being of such value as to generate a first mixing result that is translated in frequency to have a carrier at an offset frequency; mixing the VSB signal with a second beat frequency different from the carrier frequency of the VSB signal and from the first beat frequency, the second beat frequency being of such value as to generate a second mixing result that is translated in frequency to have a earner at the offset frequency; and combining the first and second mixing results to form the double-sideband amplitude-modulation signal with a carrier frequency at the offset frequency.

REFERENCES:
patent: 2583573 (1952-01-01), Jaynes
patent: 2987617 (1961-06-01), Loughlin
patent: 5479449 (1995-12-01), Patel et al.
patent: 5805242 (1998-09-01), Strolle et al.
patent: 6421403 (2002-07-01), Limberg

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