| 摘要 |
<p>The invention has an object of providing a digital orthogonal signal detector (1) of which a circuit configuration is simple, of which an occupied volume is small and of which power consumption can be reduced by using one system of a digital filer and one system of a digital signal delay circuit. The digital orthogonal signal detector according to the invention is composed of a digital signal delay circuit (8) that delays a digital signal output from an analog-to-digital converter (4) for converting a received signal of which the center frequency is not zero from analog to digital at a predetermined sampling frequency and generates an in-phase signal and a digital all-pass filter that shifts a phase of a digital signal by 90 DEG and generates an orthogonal signal, wherein the digital all-pass filter is an infinite impulse response digital filter having a fixed group delay characteristic and the digital signal delay circuit has a signal delay amount equal to a group delay amount of the digital all-pass filter. <IMAGE></p> |
