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Why are 128kbit/s MP3s usually 44,100 Hz?
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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post Oct 18 2012, 15:24
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The problem is - how exactly do you resample a 44.1kHz signal to 32kHz so that you preserve everything up to 15999Hz perfectly?

IE4 Rockbox Clip+ AAC@192; HD 668B/HD 518 Xonar DX FB2k FLAC;
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