Jamming signal scrambling and descrambling systems for catv

摘要: Scrambling and descrambling systems utilizing jamming signals provide improved pictures with minimal distortion due to ghosts artifacts. The television signal is combined a or located preferably in the vestigial sideband (VSB) of modulated picture carrier at about null spectrum modulation by horizontal sync. also are placed between harmonic components sync which define frequencies comply governmental regulations respecting frequency locations strong CATV purposes. generated phase locking submultiple frequency. Artifacts further reduced preemphasis transmitted opposite that spaced an equal increment from location energy. In order extract signal, so as descramble for reproduction subscriber's receiver, network including least one surface acoustic wave (SAW) resonator device embedded all-pass allows essentially lossless transmission spectrum, except energy enables be close (e.g., approximately 228 KHz) VSB enhanced security.