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Abstract

In order to measure the leakage power of a communications signal using a burst signal, with respect to adjacent channels, an input signal containing a modulated signal is subjected to A/D conversion in an A/D converter 23 and then written into a waveform memory 25. The input signal read from the waveform memory is demodulated to digital data by means of a demodulating section 29. An extraction region calculating section 33 detects the position of a synchronizing word in the digital data demodulated, and determines the extraction region AR of the input signal stored in the waveform memory 25. One filter 35a or a plurality of filters 35 allow passage of the signal components in the frequency bands of the channels adjacent to the main channel. Switching sections 34 and 28 supply the signals in the extraction region determined, which are included in the input signal stored in the waveform memory 25. One power measuring section 35a or a plurality of power measuring sections 35 measure the power of each signal component which has passed through one filter.

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First Claim