| 摘要 |
PROBLEM TO BE SOLVED: To judge a modulation system on a reception side, to demodulate data corresponding to the judgement and to simplify constitution by limiting a demodulation part to use to one piece. SOLUTION: This demodulator is provided with a synchronization detector 24 for detecting common-mode components and the synchronization detector 25 for detecting orthogonal components by using the reference carrier waves of a clock synchronization/reference carrier wave reproduction part 26 from reception signals, an amplitude level detection part 27 for detecting an amplitude level at the point of time of indicating a modulation symbol by the clock of the reproduction part and detecting the amplitude level between the modulation symbols, ternary-binary conversion parts 28 and 29 for converting the synchronization detected level signals of three stages to 2-bit data and a reception buffer 31 for gathering the data from the respective conversion parts, turning them to 4 bits, comparing the amplitude level information between the modulation symbols of the reception signals with the amplitude level information at the time of indicating the modulation symbol stored in a memory 30, judging the modulation system and demodulating the data.
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