Principles Of Audio Compression Technology

- Jun 20, 2018-

The basis for audio signal compression is audio compression technology.

Audio compression technology refers to the use of appropriate digital signal processing techniques for the original digital audio signal stream (PCM encoding), which reduces (compresses) its code rate without loss of useful information or negligible loss. It is called compression coding. It must have a corresponding inverse transform, called decompression or decoding. Audio signals may introduce a lot of noise and some distortion after passing through a codec system.

In the field of audio compression, there are two compression methods, lossy compression and lossless compression. The common MP3, WMA, and OGG are called lossy compression. Lossy compression, as the name suggests, is to reduce the audio sampling frequency and bit rate, and the output audio file will be smaller than the original file. Another type of audio compression is called lossless compression, which is what the topic says. Lossless compression can compress the volume of an audio file to be smaller under the premise of saving all the data of the original file at 100%, and after restoring the compressed audio file, the same size and the same code rate as the source file can be achieved. Lossless compression formats include APE, FLAC, WavPack, LPAC, WMA Lossless, Apple Lossless, La, OpTImFROG, Shorten, and the common, mainstream lossless compression formats are APE and FLAC.



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