| 摘要 |
PURPOSE:To improve time-voltage transducing sensitivity, by using a ramp generator for generating a ramp wave with a steep gradient only when intervals of inversion are greater than a specific value. CONSTITUTION:A pulse generator 17 is triggered by an output pulse C of a double-edge detecting circuit 13 to generate a pulse F with a specific pulse width. The ramp generating circuit 14 responds to the rise of the output pulse F to generate a ramp wave D and is reset in response to the fall of a next output pulse F. Consequently, the waveform of the ramp wave is very steep. Then the amplitude of each pulse is proportional to intervals of the inversion of a reproduced signal and its maximum amplitude (peak value) is the same with a conventional device. The peak value of this ramp wave is sent to a differential amplifier 6 to control the rotating speed of a motor 3. |
