Carrier recovery apparatus of VSB receiver and a method of...

Details Carrier recovery apparatus of VSB receiver and a method of... Carrier recovery apparatus of VSB receiver and a method of...

2006-12-12

2006-12-12

Vo, Don N. (Department: 2611)

Pulse or digital communications

Receivers

Amplitude modulation

C375S326000, C375S327000

Reexamination Certificate

active

07149260

ABSTRACT:
A carrier recovery apparatus includes a first LPF calculating a carrier changing in accordance with a frequency offset, by using a pilot tone included in an I-signal of a VSB broadcasting signal, a limiter limiting a size of the carrier calculated by the first LPF and outputting the limited size of the carrier, a multiplier multiplying the limited size of the carrier from the limiter by a Q-signal of the VSB broadcasting signal, a second LPF extracting a DC-property corresponding to a frequency error of the carrier from a product output from the multiplier, a numerically controlled oscillator (NCO) generating a complex carrier corresponding to the DC-property from the second LPF, and a frequency error providing unit arranged between the second LPF and the NCO, storing the DC-property from the second LPF, and when the pilot tone is distorted by a damaged pilot in the I-signal, providing the NCO with the DC-property that is previously input and stored therein.

REFERENCES:
patent: 6396550 (2002-05-01), Oh
patent: 2003/0145328 (2003-07-01), Rabinowitz et al.
patent: 09-121315 (1997-05-01), None
patent: 2000-041073 (2000-02-01), None
Office Action issued from the Japanese Patent Office on Dec. 21, 2004, with respect to Japanese Patent Application No. 2003-19210, filed Jan. 28, 2003.

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