专利汇可以提供Interrogated transponder system专利检索,专利查询,专利分析的服务。并且An interrogated transponder system of the type which may be used for billing purposes with subscription television systems, wherein a central station interrogates a large number of individual subscriber stations to determine the condition of the subscriber''s receiver and/or an associated terminal device. Each transponder includes a storage register of the type in which data may be stored in parallel and read out in serial form. The information stored in the register may represent the channel to which the receiver is tuned or the condition of a plurality of data switches which enable the subscriber to transmit data back to the central station. The subscribers may be divided into groups and subgroups with each subgroup being responsive to a different combination of frequencies transmitted by the central station. This combination of frequencies is used as an address code which identifies each individual subscriber or terminal station. One of the transmitted frequencies is used as a source of shift pulses to shift the information from the storage register as well as part of the address code which identifies the subscriber station. The output of the shift register, in serial form, is transmitted back to the central station by FSK techniques, with the frequencies employed identifying the specific subscriber within the subgroup.,下面是Interrogated transponder system专利的具体信息内容。
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