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DISCRIMINATOR FOR DISCRIMINATING EMPLOYED MODULATION TECHNIQUE, SIGNAL DEMODULATOR, MUSICAL INSTRUMENT AND METHOD OF DISCRIMINATION
DISCRIMINATOR FOR DISCRIMINATING EMPLOYED MODULATION TECHNIQUE, SIGNAL DEMODULATOR, MUSICAL INSTRUMENT AND METHOD OF DISCRIMINATION
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机译:区分嵌入式调制技术的鉴别器,信号解调器,乐器和鉴别方法
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摘要
A signal modulator includes a discriminator for discriminating a modulation technique through which a carrier signal was modulated to a quasi audio signal and a signal demodulation module for reproducing a continuous data stream from the quasi audio signal through a demodulating technique corresponding to the discriminated modulation technique; the discriminator includes a sampling circuit for extracting groups of samples from the quasi audio signal during each period of the carrier signal, an integrator calculating an integrated value on each group of samples, a comparator comparing the integrated value with a threshold for a neighborhood of zero so as to determine the groups of samples with the integrated value less than the threshold and a determiner measuring the time period between the groups of two modulation period and discriminating 16DPSK when the time period is equal to the modulation period.
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