| 摘要 |
Disclosed is a system for sampling or interrogating selected ones of a plurality of remote units at which are located television receivers, to determine which of a plurality of television channels are being viewed at the interrogated remote units at the particular time of interrogation. The system includes a master station which transmits interrogation signals simultaneously to a plurality of remote units. Each remote unit includes a data transducer mechanism and a transmitter mechanism for transmitting reply signals back to the master station. The data transducer is coupled to the television receiver channel selector and is responsive thereto for generating data signals representing the particular channel being viewed at any given instant. Each remote unit also includes a data readout mechanism responsive to readout signals transmitted from the master station for producing a digital data signal representative of the data signal generated by the data transducer and supplying same to the transmitter mechanism. The disclosed system is especially adapted for use in a community antenna or cable television system in which each remote unit is coupled to the cable system.
|
