PLL controller applying a multiplier coefficient appropriate...

Details PLL controller applying a multiplier coefficient appropriate... PLL controller applying a multiplier coefficient appropriate...

2011-02-22

2011-02-22

Tran, Thai (Department: 2484)

Motion video signal processing for recording or reproducing

With interface between recording/reproducing device and at...

Synchronization

C386S202000, C386S204000, C386S205000

Reexamination Certificate

active

07894705

ABSTRACT:
A PLL controller for controlling the tracking rate of a phase-locked loop (PLL), in particular, controlling coefficients to be input to a device such as a multiplier of the phase-locked loop. A PLL controller receives a phase error between a horizontal sync signal in a video signal and a reference signal. Then an error amount detector measures the phase error using the N thresholds to output a control signal indicating any of N+1 levels. A coefficient selector outputs one of the N+1 gains as a coefficient signal, the one gain corresponding to the level indicated by the control signal, so that the tracking rate of the phase-locked loop is controlled in response to the input video signal, and thus a high-quality video image with less jitter can be provided.

REFERENCES:
patent: 5142377 (1992-08-01), Moriyama et al.
patent: 10-224732 (1998-08-01), None
patent: 2003-23597 (2003-01-01), None

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