Television security system

摘要: A system for subscription TV security which is comprised of a scramble signal generator adds modulated RF carrier to the channel transmission. Preferably frequency selected fall within band frequencies between video and audio carrier. The transmitted receivers encoded with providing false misleading information, preventing receiver from reconstituting coherent picture or sound while this present. decoded, (i.e. removed), restoring regular reception by filtering sharply tuned high-Q notch filter attached drop line going receiver. By careful selection width attenuation pre-emphasis band, degradation information prevented.