| 摘要 |
PURPOSE:To enable the setting of a threshold automatically by setting a threshold voltage of a comparatively operational amplifier (n) times as large as a square mean of an input electrical signal. CONSTITUTION:A sensor section 1 converts a physical stimulation into an electrical signal S1 and a signal processing circuit 2, processes a signal for the removal, amplification, modulation and the like of a noise component to output a signal S2, which S2 contains a noise component left, not removed. The signal S2 is inputted into a positive input terminal of a comparatively operational amplifier 3 while being inputted into an RMS value generation circuit 4 and an RMS value voltage S4 is outputted and multiplied (n) times with a multiplication circuit 5 to generate a threshold voltage S5, which is inputted into a negative terminal of the amplifier 3. Only when the signal S2 exceeds the signal S5, an output S3 of the amplifier 3 goes to H while others thereof go to L. Thus, a desired signal component alone is binary coded to be outputted. |
