| 摘要 |
PURPOSE:To enable the measuring of frequencies of two waves close in the frequency inputted simultaneously, by arranging a circuit for detecting amplitude within a pulse, an amplitude detection circuit, an output level selection circuit and a frequency detection circuit. CONSTITUTION:An input signal 1 passes through a filter bank 2, an A/D converter 3, a channel selection circuit 4 and a frequency calculating circuit 5 and a calculated frequency 8 is given as output. At the same time, the output is branched to a circuit 9 for detecting amplitude within a pulse from the filter bank 2 to measure the max. and min. amplitude values within the pulse. Then, an amplitude detection circuit 10 detects the amplitude level of two waves simultaneously inputted. Subsequently, an output level selection circuit 11 selects amplitude levels of two waves of filters from adjacent filter outputs and a frequency detection circuit 12 detects frequency 13 of two waves close to each other.
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