Abstract: A satellite controlled TV audience response system provides means for current processing of answers to audience polls so that answers may be presented in TV pictures alongside the questions substantially instantaneously. This system has the capacity to process both local audience responses such as those in the vicinity of a particular TV station, and audiences over a large geographic area, so that responses can be analyzed to take into account regional differences in response or differences in the listeners to different TV station audiences. The system is fully capable of interaction with local cable networks. Responses can be analyzed at local ground stations for billing purposes, etc., and can be analyzed at the satellite station for retransmission of various audience responses to the polled audience. This invention makes feasible a fully automated instantaneous nationwide TV polling and response feedback system.

Abstract: In a TV answer back system where many receiver stations communicate with a TV transmitter station by means of rf pulses generated by rf oscillators at the receiver station, the requirement for keeping all oscillators on frequency is achieved without crystal temperature control by automatically controlling the rf oscillator frequency using synchronization signals carried in the video signal received from the TV studio. By this invention it has been possible to control the frequency of multiple megahertz oscillator as accurately as desired from relatively low frequency synchronizing signals such as the vertical and horizontal video sync pulses. Thus an oscillations counter is gated for a very accurate time period by the sync pulses, and the oscillation count is compared with a datum count representing the desired oscillation frequency.