I have done this using burrows wheeler transform ,huffman encoding and decoding of huffman,burrows wheeler transform?
MATLAB: If I am getting the 0.7466 ,0.6646 as compression ratio of audio fles and 26% and 34% as the saving percentage,is it best compression ratio or I have to improve it
compression ratio
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Hi, if you are using wdencmp(), then use the optional output argument PERF0.
If you use wcompress(), use the output argument, CR
Hi Khaled,
Looking at the static characteristic (input/output graph), the ratio R is the reciprocal of the slope above the threshold. (Below the threshold the slope is 1.) In the doc example, above threshold the output increases 3 dB for a 15 dB increase in input, so the slope is 3/15 = 0.2. The ratio is the reciprocal of that: 15/3 = 5.
In the doc for compressor you can find the equation for the static characteristic above threshold, where you can see that the slope is 1/R:
hth,
Charlie
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