A MULTI-SYNCHRONIZATION CORRESPONDENCE FREQUENCE DISTINCTION CIRCUIT

摘要

A circuit for identifying multi synchronous matching frequency which can easily perform a signal processing is disclosed. The circuit comprises: a synchronous divider(20) for dividing a horizontal synchronous from input multi-synchronous video signals; a frequency divider(30) for dividing the horizontal synchronous from a desired ratio; a pulse generator(40) for generating a pulse of desired frequency; a counter(50,60) for counting a number of the horizontal synchronous in the reference of the generated pulse; and an encoder(70) for coding the number of the counted horizontal synchronous.