Digital convergence device

Abstract

Abstract PURPOSE:To attain convergence adjustment excellent in accuracy by controlling the address of a memory element and the cut off frequency of an LPF according to an inputted horizontal scanning frequency, selecting the memory element according to an aspect and controlling the number of scanning lines between search points and a coefficient value according to the number of scanning lines. CONSTITUTION:According to a signal from a horizontal scanning frequency detecting part 26 for detecting the horizontal scanning frequency of a signal, the address of one frame memory 10 and the cut off frequency of the LPF30 are controlled. According to a signal from an aspect detecting part 32 for detecting the aspect ratio, the one frame memory having various types of memories is selected, according to a signal from a scanning line number detecting part 31 for detecting the number of the scanning lines of the signal, the data of a setting part 27 of the number between the search points and a coefficient setting part 28 is controlled to perform a processing between vertical adjustment points. Thereby, since a space adjustment point position and the quantity of correction constantly correspond to the signal different in the input scanning frequency and the aspect ratio, the convergence can be adjusted with excellent accuracy.

Inventors

• 👤 Susumu Tsujihara
• 👤 辻原　進

Bibliographic Details