| 摘要 |
A direct conversion radio apparatus comprises a local oscillator (7) which generates a high-frequency signal of almost the same frequency as that of a signal to be received, a modulator (91) which modulates the high-frequency signal generated from the local oscillator (7) in carrier sensing, mixers (5, 6) which frequency-convert a received signal into a baseband frequency by using the high-frequency signal modulated by the modulator (91) in carrier sensing, low-pass filters (11, 13) which limit bands of baseband signals extracted by frequency-converting by the mixers (5, 6), and a baseband circuit (10) which controls the frequency of the high-frequency signal generated from the local oscillator (7) and also performs carrier sensing by amplitude of the baseband signals output from the low-pass filters (11, 13).
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