Phase locked loop synchronizer for a resampling system having in

Details Phase locked loop synchronizer for a resampling system having in Phase locked loop synchronizer for a resampling system having in

1993-07-23

1994-08-02

Groody, James J.

Television

Synchronization

Automatic phase or frequency control

348540, 348441, H04N 504, H04N 506

Patent

active

053350740

ABSTRACT:
A video signal conversion system converts input video signals in a studio format, such as CCIR 601 (625/25), into output video signals in another format, such as the Phase Alternate Line (PAL) format. The horizontal line scanning frequency of the input and output signals is the same. The signal conversion system uses an output clock signal to determine the relative timing of the input and output video signals. This signal is generated by a phase-locked loop which employs a crystal-controlled VCO. The phase of the signal produced by the VCO is adjusted to maintain the sampling clock signals of the input and output video signals in a predetermined phase relationship. The phase error signal which is used to control the VCO is generated by comparing a first phase reference signal, generated from the output signal, to a second phase reference signal generated from the input signal. The output phase reference signal may be the synchronizing signal component of the converted video signal or an indication that a predetermined interpolation phase is being applied by the resampling system. The input phase reference signal may be the input clock signal or an indication of the start of a horizontal line interval.

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