ディジタル色復調位相同期回路

概要

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This paper describes a dijital phase-locked oscilator for color demoduration in NTSC signals sampled by international standardized sampling frequency 13.5MHz. The phase lock is established by making phase difference a between local color subcarrier and color burst signals zero. Therefore, for generating of local color subcarrier sin(ωsc+θ). cos(ωsc+θ) and calcurating of θ= tan^<-1>(sinθ/cosθ). large capacity of ROM are required. In this paper, for reduction of the capacity of ROM, phase generating is carried out by using an accumulator, and detecting range of θ is limitted to ±π/4. Experimental results using a developed phase-locked circuit show that the standard and nonstandard NTSC signals are demodulated with good quality.
社団法人映像情報メディア学会の論文
1989-06-16