| 摘要 |
PURPOSE:To prevent the noise produced when the digital signal of the time when punch-in and punch-out are carried out is returned to an analog signal, by fading in and fading out the digital signal with a multiplication circuit. CONSTITUTION:If the synchronizing signal pattern of a synchronizing signal separating circuit 11 and the synchronizing signal pattern of a memory circuit 12 in which the synchronizing signal of one frame before is memorized are compared 13 in the case of reproducing the signal recorded by inserting different patterns in the synchronizing signal parts before and after the punched-in and punched-out parts, the punched-in and punched-out parts are detected. The value such as the one shown in the figure is generated in a multiplier generating circuit 16 by the signal of comparator circuit 13, and is multiplied 15. If the time when the multiplier generating circuit 16 turns to 0 from 1 is defined at (t), the delay time of a shift register circuit 14 is made the same as (t), by which the joint of data is brought just to the point (f) of the multiplier 0 of the circuit 16. As a result, if the output digital signal of the multiplier 15 is converted to an analog signal, there are no more discontinuous points in the analog signal. |
