| 摘要 |
PURPOSE: To obtain a frequency discriminator having a discrimination function corresponding to a sense system and capable of outputting information at real time by providing the discriminator with plural waveform shaping means and comparing means corresponding to the number of channels and finding out the data of a value corresponding to amplitude voltage and a period. CONSTITUTION: An acoustic signal is selected by a band pass filter group 20 and a signal inputted to an analog switch 26 is rectified to a half-wave signal and voltage corresponding to the amplitude of the half-wave signal is outputted from an integrator 28 to be an integration means and held in a sampling and holding circuit 34 to be a holding means. On the other hand, a signal inputted to a zero cross comparator 24 is compared, a zero cross wave is outputted from the comparator 24 and voltage corresponding to a half period is outputted from an integrator 30 to be an integration means and held by a sampling and holding circuit 36 to be a holding means. The held voltage data are sent to a CPU 40 including an arithmetic means and substituted by a parameter indicating the quantity of a sense such as the level and height of a sound and the quantity of the sense can be display on a CRT 42 by the distribution graphic of frequency bands, a color sorted graphic, or the like. |
