DeltaCompression

DeltaCompression - the value of the sample itself. Example...

Info iconThis preview shows pages 1–8. Sign up to view the full content.

View Full Document Right Arrow Icon
Delta Compression Simple compression of audio-type data on a DSP By: Eric Santos
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Employs a simple algorithm that stores each sample based on the difference between it and the sample before This allows the encoded data to be represented using fewer bits Using continuous data where each sample is similar to the one before can yield high ratios of compression This method is especially effective with audio data Approximately 8-9% CPU load in debug mode Useful in real time Can be employed at the back-end of other encoding schemes Lossless
Background image of page 2
What is stored? Using delta compression, what is stored is the difference between the samples, not
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Background image of page 4
Background image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Background image of page 6
Background image of page 7

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Background image of page 8
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: the value of the sample itself. Example input buffer (uncompressed) Note min and max 16 bits per sample 16,000*2 = 32,000 bits per channel 2*32,000 = 64,000 bits (approx.) 216 = 65,536 First sample requires full bit length, since there is no previous sample to compare. Each subsequent sample is much smaller. In this example, other than the first sample, the entire buffer can be represented using 15 bits. A sample of the ratio of output vs. input of 500 buffers. Lower value means higher compression. 2000 buffers The difference between the uncompressed input and the decompressed output is zero. Lossless! ....
View Full Document

This note was uploaded on 02/10/2012 for the course ECE 3551 taught by Professor Staff during the Spring '11 term at FIT.

Page1 / 8

DeltaCompression - the value of the sample itself. Example...

This preview shows document pages 1 - 8. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online