2010-07-01 04:02:06 +02:00
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shorten reduces the size of waveform files (such as audio) using Huffman
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coding of prediction residuals and optional additional quantisation. In
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lossless mode the amount of compression obtained depends on the nature
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of the waveform. Those composing of low frequencies and low amplitudes
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give the best compression, which may be 2:1 or better. Lossy compression
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operates by specifying a minimum acceptable segmental signal to noise
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ratio or a maximum bit rate. Lossy compression operates by zeroing the
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lower order bits of the waveform, so retaining waveform shape.
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