Coding algorithm: The role of coding is to use a certain format to record digital data, and second, to use a certain algorithm to compress digital data.
Compression ratio: One of the basic indicators of compression coding is the compression ratio: the compression ratio is usually less than one. Compression algorithms include lossy compression and lossless compression; lossy compression means that the data cannot be completely restored after decompression, and some information is lost. The smaller the compression ratio, the more information that is lost and the greater the distortion after the signal is restored. According to different applications, different compression coding algorithms can be used, such as PCM, ADPC, MP3, RA and so on.
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