| 摘要 |
<p>PURPOSE:To make it possible to generate a stable cue signal for a fixed time all the time by performing digital processing by controlling a gate which passes a pulse generation output through by digitally latching the state of an operation switch and also by opening the latch via a counter. CONSTITUTION:With operation switch 16 closed, latch circuit 14 reset by a power- on clearing circuit is set and the high-level output of circuit 14 corresponding to the closing of switch 16 opens NAND gate 18 and also clears counter 20. Then, inversion pulses of fixed amplitude and a fixed low frequency from pulse generating circuit 22 via gate 18 are converted by inverter 24 and waveform converting circuit 26 into a sine wave and triangular wave with higher-harmonic components, i.e., noise components, removed, thereby obtaining a cue signal. On the other hand, when inversion pulses from gate 18 are counted by counter 20 up to a fixed value, the latching of circuit 14 is reset and through digital processing, the stable cue signal based upon generated pulses of the pulse generating circuit is generated for a fixed time all the time.</p> |
