VISION AND AUDITION CONTROL SYSTEM OF CATV

摘要: PURPOSE:To reduce considerably the capacity of a ROM and to change dynamically whether parental control is allowed or not by superposing data signal upon TV at center side sending out resulting signal, separating from terminal performing control. CONSTITUTION:An encoder 10 superposes such as generated generator 11 an audio signal. A command message channel branched in front comparator 18 demodulated FSK receiver 14 supply information microcomputer 15. 20 extracts selected tuning converter inputs it 15 through interface 22, thereby deciding ROM23 which read on basis previnously supplied state switch 24.