Because digitization of the audio signal requires a large amount of storage capacity to store, it has been a long time ago that people began to study the problem of audio signal compression. The compression of audio signals is different from the compression of binary signals in computers. In computers, the compression of binary signals must be lossless. That is, after compression and decompression, the signal must be exactly the same as the original signal, and cannot have one bit. error. This compression is called lossless compression. But the compression of the audio signal is not the same, and its compression can be destructive, as long as the compressed sound and the original sound sound the same as the original sound. Because the human ear is not sensitive to certain distortions, the potential for compression is relatively large, that is, the proportion of compression can be large. When the audio signal uses a variety of standard lossless compression, its compression ratio can be up to 1.4 times. However, the compression ratio can be high when using lossy compression. Here are the performances of several standard compression methods. Sort by quality from high to low.
It should be noted that Mbyte is not exactly 1 Mbit, but 1024x1024=1048576Byte. It must be pointed out that these compressions are at the expense of sound quality, especially the last two methods, which are achieved by reducing the sampling rate and reducing the resolution. This is a great loss of sound quality, so these methods are not desirable.
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