| 摘要 |
A digital communication apparatus in which a QPSK signal is received and frequency-converted to an intermediate frequency signal, the intermediate frequency signal is subjected to A/D conversion and separation into an I-component and a Q-component to obtain I-component and Q-component digital data, and the original digital data is obtained from the I-component and Q-component digital data. The digital commumication apparatus has an A/D converter circuit for performing the above-mentioned A/D conversion, a level control circuit for controlling the level of a signal supplied to the A/D converter circuit to a predetermined value, and a disturbance signal level detection circuit for detecting the disturbance signal level contained in the received signal.
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