| 摘要 |
PROBLEM TO BE SOLVED: To prevent the interference of acoustic and detect a target reliably even when the frequency bands of transmission signals of a plurality of target detection devices are not sufficiently apart.SOLUTION: A replica signal generation unit 121 generates a replica signal. A first FFT processing unit 122 performs Fourier transformation on the replica signal. A first out-band cutoff processing unit 123 generates a specific replica signal from the replica signal. A receiving unit 124 receives a reflection sound. A Gaussian window function processing unit 125 generates a Gaussian multiplication value from the received signal. A second FFT processing unit 126 performs Fourier transformation on the Gaussian multiplication value. A second out-band cutoff processing unit 127 generates a specific Gaussian multiplication value from the Gaussian multiplication value. A cross spectrum processing unit 128 performs a cross spectrum arithmetic on the specific replica signal and the specific Gaussian multiplication value, and generates a cross spectrum output value.SELECTED DRAWING: Figure 1 |
