| 摘要 |
PURPOSE:To incorporate a delay time constant circuit in an IC by dividing the frequency of a reference signal REF30 by a sound circuit. CONSTITUTION:For example, a signal (h) of 30Hz inputted from an REF30 input terminal 56 is frequency-divided by a frequency dividing counter 57. A reproducing signal (g) from a playback signal input terminal 15 is inputted to the trigger T input of a flip-flop F/F58, D inputs of FFs 64 and 65, and an inverter 61, whose output is inputted to the T input of an F/F59. Further, a recording signal (e) from a recording signal input terminal 16 is inputted to the D input of an F/F66 and an inverter 67, whose output is supplied to the reset terminal R of the F/F66. Consequently, a time constant delay circuit for mode switching, etc., is composed of a digital JC such as flip-flops, so large capacity for time constant setting is reduced and the circuit is incorporated in the IC. |
