METHOD AND DEVICE FOR COMPENSATION PHASE OF DIGITAL SIGNAL AUTOMATICALLY

摘要

The present invention provides an automatic phase correction method for reconstructing a baseband signal without using a PLL circuit for processing a color signal of a video signal recording and reproducing apparatus, wherein the frequency and frequency of a modulation carrier of an input color signal correspond to a color signal section and a burst section. Generating demodulated carriers of the same frequency, multiplying the input color signal of the color signal interval by a demodulated carrier having the same frequency as its modulated frequency carrier, low-converting the multiplication result of the color signal interval, the burst duration Multiplying the demodulated carrier having the same frequency as the modulated frequency carrier by the input color signal, low-passing the multiplication result of the burst section, obtaining a burst gain value, and using the obtained burst gain value to obtain a phase error value Finding step and removing phase error component Wherein the low-pass conversion is performed by low-pass filtering, the input color signal is an NTSC or PAL signal, and the obtaining of the burst gain value comprises converting the low-transformed signal into a latch signal of the resultant signal. Adding, and latching the added result according to the burst period signal.