Counter control circuit for controlling counter having a pulse p

Details Counter control circuit for controlling counter having a pulse p Counter control circuit for controlling counter having a pulse p

1997-07-07

2000-04-11

Peng, John K.

Television

Synchronization

Automatic phase or frequency control

348542, 348510, 327 31, 377 44, 377 15, H03L 700, G01R 2902

Patent

active

060493585

ABSTRACT:
A counter control circuit of a counter for measuring a pulse period of a video synchronization signal includes a main control unit having a synchronization signal input Sync, and a control signal producing unit including a stop signal generator, a latch signal generator, and a start signal generator. The outputs of the stop, latch and start signal generators are supplied to the counter for controlling the counter to count clock pulses fed from a clock generator in response to receipt of a start signal and output a count value in response to receipt of a latch signal. The main control unit produces sequential control signals during the input of the video synchronization signal differentiated by the clock pulses. The counter control circuit allows the counter to measure a pulse period of an input synchronization signal in a stable state that results in an accurate count value, since the count operation is first stopped and the count value is latched by the clock signal.

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