| 摘要 |
PURPOSE:To obtain a small-size and low-cost stereo composite signal generating circuit which is free from adjustment by using such component parts as the switch circuit, the subcarrier generator, the divider and others. CONSTITUTION:Switching circuit 40 consists of the transformer and the bridge rectifier. Input signal A or B supplied from terminals 41 and 42 connected oppositely to each other is given the time-division conduction alternately according to the direction of the subcarrier supplied to the primary side of the transformer and then delivered from the intermediate tap of the secondary side of the transformer and in the form of the time-division composite signal. Subcarrier generator 44 and divider 50 producing the pilot signal are formed with JKFF. In such constitution, the time- division composite signal can be produced by just switching circuit 40 to obtain the composite compound signal without using such complicated circuit as the matrix circuit or the like and with no intermediate signals required as the sum signal, the difference signal and others. |
