MULTI-INTERMEDIATE FREQUENCY SIGNAL PROCESSING SYSTEM

摘要

The system relates to multi-intermediate frequency processing which is applicable to all TV broadcasting methods such as NTSC, PAL and SECAM. The circuit comprises a trap and filter circuit for filtering the video signal of a specific frequency, a mode selection circuit for selecting a suitable broadcasting method according to the control signal from a microcomputer, and a trap and a voice switches for filtering appropriate frequencies for each broadcasting method in accordance with the mode selection signal.