Circuit for crispening the edges of a video signal

摘要

In certain signal components, edges can be overemphasised too much which leads to a disturbing relief effect. According to the invention, a high-pass filter (30) is provided in the path of the video signal to the circuit (11-13; 16-18) generating the correction voltage (21). This filter has a cut-off frequency of about 800 kHz so that video signal components below this frequency are not evaluated. <IMAGE>