TECHNIQUE FOR ENCODING AND DECODING T. V. TRANSMISSIONS BY MEANS OF A CODED ELECTRONIC TICKET

摘要

A television program is transmitted at a carrier frequency outside the regular television reception channels. The subscriber-viewer is provided with a coded ticket which, when inserted into a receptacle, establishes a resonant frequency for a tuned circuit in that receptacle. The resonant frequency signal is processed to actuate a converter local oscillator which translates the carrier of the received program signal to a designated television channel of a conventional television receiver that is not normally employed for receiving broadcast television programs.