| 摘要 |
An over-sampling device is provided for double over-sampling the input signal and for outputting as a sampling signal. The sampling signal is filtered at one of conversion rates of 147/160, 160/147, and 1/1 by using a prototype filter, based on the first sampling frequency and the second sampling frequency, and a filtering signal is produced. The filtering signal is filtered by a low pass filter having a predetermined cutoff frequency band, and a low frequency signal is produced. A down-sampling device is provided for down-sampling the low frequency signal by one half.
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