| 摘要 |
PURPOSE:To reduce the number of signal rectifying circuits by one by providing a switch circuit which opens and closes the input circuit of a filter which corresponds to a signal sent next, by the output of a rectifying circuit which is sent early. CONSTITUTION:The 1st signal from an input terminal 1 is passed through a filter 2 and rectified by a rectifying circuit 6, whose output is held for an enough time to receive the 2nd signal. Then, a switch 5 is connected by said output. If the 2nd signal arrives within a certain time, this signal is outputted through a filter for the 2nd signal to the rectifying circuit 6 and held until enough time to receive the 3rd signal. When the 3rd signal arrives, it is applied to the rectifying circuit through a filter for the 3rd signal. As a result, when a time zone when the outputs of the rectifying circuits 6 and 7 overlap each other in terms of time is obrained, this subordinate station is considered to be called selectively. |
