Carrier tracking loop lock detector

Details Carrier tracking loop lock detector Carrier tracking loop lock detector

2003-11-12

2008-09-02

Ha, Dac V (Department: 2611)

Pulse or digital communications

Receivers

Angle modulation

C375S344000, C375S373000

Reexamination Certificate

active

07421042

ABSTRACT:
An ATSC (Advanced Television Systems Committee) VSB (Vestigial Sideband) receiver includes a carrier tracking loop (CTL) for processing a received ATSC VSB signal and a CTL lock detector. The CTL lock detector includes an averaging filter for averaging the down-converted received ATSC VSB signal to provide a DC offset, an estimator for providing an estimate of the DC offset, and a comparator for providing a lock signal as a function of a comparison between the estimate of the DC offset and the DC offset, wherein the lock signal is representative of either a locked condition or an unlocked condition of the CTL.

REFERENCES:
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patent: 5568521 (1996-10-01), Williams et al.
patent: 5692014 (1997-11-01), Basham et al.
patent: 6005640 (1999-12-01), Strolle et al.
patent: 6233295 (2001-05-01), Wang
patent: 6697609 (2004-02-01), Wakamatsu et al.
patent: 2001/0022813 (2001-09-01), Tan et al.
United States Advanced Television Systems Committee, “ATSC Digital Television Standard”, Document A/53, Sep. 16, 1995, pp. 1-74.
United States Advanced Television Systems Committee, “Guide to the Use of the ATSC Digital Television Standard”, Document A/54, Oct. 4, 1995; pp. 1-148.
Search Report dated Jun. 7, 2004.

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