| 摘要 |
PROBLEM TO BE SOLVED: To provide a device/method which can separate the superimposed waveform information signal from the synthetic signal obtained by superimposing an optional waveform information signal on a sine wave signal without causing any distortion of waveform on a time base. SOLUTION: A sine wave signal is extracted from the sine wave signal on which a waveform signal is superimposed via an LPF 12, and the phase of the extracted sine wave signal is shifted by a differentiator 16. The sine wave signal extracted by the LPF 12 is added to the phase shifted sine wave signal by a phase converter 20 to generate a sine wave signal on which the waveform signal is not superimposed yet. The generated sine wave signal is subtracted from the sine wave signal on which the waveform signal is superimposed by 4 subtracter 30. Thus, the relevant waveform signal is extracted. As a sine wave signal having no phase shift to the original sine wave signal is generated and a waveform signal is extracted, the waveform signal can be extracted with no distortion caused on a time base. Therefore, this device/ method can be suitably used when the transmitted signal is reproduced in a spread spectrum communication system. |
