Discriminator for discriminating employed modulation technique, signal demodulator, musical instrument and method of discrimination
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United States of America Patent
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Apr 23, 2013
Grant Date -
Jun 24, 2010
app pub date -
Dec 14, 2009
filing date -
Dec 19, 2008
priority date (Note) -
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Abstract
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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