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Continuously Variable Slope Delta (CVSD) audio encoder ...
https://liquidsdr.org/doc/cvsd/#:~:text=Continuously%20variable%20slope%20delta%20%28CVSD%29%20source%20encoding%20is,It%20is%20a%20form%20of%20delta%20modulation%20where
One-bit Delta Sigma Audio Encoding (DSD) - loc.gov
https://www.loc.gov/preservation/digital/formats/fdd/fdd000230.shtml
One-bit Delta Sigma (or Sigma Delta) Audio Modulation; Direct Stream Digital (DSD; trade name) Description. Encoding for audio using pulse-density modulation; the signal is stored as delta-sigma (some say "sigma delta") modulated digital audio, a sequence of single bit values at a high frequencies. Although delta-sigma encoding is applicable to a variety of digital …
Delta Sigma audio encoding (DSD) - Glossary - Federal ...
http://digitizationguidelines.gov/term.php?term=deltasigmaaudioencodingdsd
Definition: Process for sampling an input signal. In the realm of digital content, this approach is generally seen as applied to sound, where it is often described as "oversampling." The delta-sigma (some say "sigma delta") converter digitizes the audio signal with a very low bit depth (generally 1-bit) but a very high sampling rate. The oversampling and subsequent digital processing reduce …
Delta coding for audio compression - Paul Bourke
http://www.paulbourke.net/dataformats/compress/
The file size from this simple minded delta coding is 11739824 / 2 + 1098506 + 6 * 2 = 6968430 bytes This is a factor of 3.6 times smaller, the maximum saving if all the differences could be saved as nibbles would be 4. There are lots of improvements that can be made to this, for example Huffman coding.
Delta Encoding - dspguide.com
https://www.dspguide.com/ch27/4.htm
The key feature is that the delta encoded signal has a lower amplitude than the original signal. In other words, delta encoding has increased the probability that each sample's value will be near zero, and decreased the probability that it will be far from zero. This uneven probability is just the thing that Huffman encoding needs to operate.
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