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Why are 128kbit/s MP3s usually 44,100 Hz?
eamon123
post Oct 14 2012, 01:44
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Since 128kbit/s MP3s usually has a low-pass filter at 16,000 Hz, and the Nyquist-Shannon theorem states that all frequencies under f/2 Hz can be totally described at an f Hz sampling rate, why not encode at 32,000 Hz? Wouldn't it save more space?
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robert
post Oct 16 2012, 18:46
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MPEG-1 Layer 3 frames consist of 2 granules a 576 samples. So a long block at 32 kHz has 18 ms duration, a short block 6 ms.
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