Ntsc/pal video signal conversion apparatus employing itu-r bt.601 video

Abstract

An NTSC/PAL video signal conversion apparatus employing a ITU-R BT.601 video signal, comprising a timing reference signal decoder for detecting a timing reference signal from external input data in response to an external clock signal, a counting circuit for performing a plurality of counting operations in response to output signals from the timing reference signal decoder and the external clock signal, a write address generator for generating a write address, a write enable signal and a chip enable signal in response to output signals from the counting circuit, a read address generator for generating a read address, a read enable signal and a chip enable signal in response to the output signals from the counting circuit, a first multiplexer for selecting one of the write address from the write address generator and the read address from the read address generator in response to the external clock signal, a first D flip-flop for latching the external input data, a memory for storing output data from the first D flip-flop, a second D flip-flop for latching output data from the memory, a timing reference signal generator for decoding the output signals from the counting circuit, and a second multiplexer for multiplexing an output signal from the timing reference signal generator and output data from the second D flip-flop.