| 摘要 |
A signal detector for detecting a narrow-band signal of a desired frequency, using an adaptive type FIR filter having two filter coefficients, is disclosed. Using this filter, the input signal of a shift register which delays the signal, is estimated by referring to the output therefrom. A narrow-band signal of a desired frequency is detected by comparing each filter coefficient of this filter with a known filter coefficient corresponding to the frequency which is the object of detection.
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