Headset Xiaobai must read for one minute to understand what PCM code is.
Release time:
2024-01-18
Whether it is an ordinary music lover or a headset enthusiast, everyone will know a little about the common audio coding formats, such as MP3, AAC, WAV, FLAC, DSD, etc. However, if someone suddenly talks to you about the PCM encoding format, some people may be a little confused. So today we will use about a minute of time, simple and quick understanding of what is the PCM encoding format.
Whether it is an ordinary music lover or a headset enthusiast, everyone will know a little about the common audio coding formats, such as MP3, AAC, WAV, FLAC, DSD, etc. However, if someone suddenly talks to you about the PCM encoding format, some people may be a little confused. So today we will use about a minute of time, simple and quick understanding of what is the PCM encoding format.
PCM coding (Pulse Code Modulation), that is, pulse code modulation, developed in the late 1970 s and became the main audio modulation mode for CDs and DVDs. Its sampling frequency ranges from 44.1kHz to 192kHz, and at its input end, a filter needs to be set to limit the frequency of only 20Hz ~ 22.05kHz to pass, so that it can cover the entire frequency range (20hz ~ 20KHz) audible to the human ear.
The bit rate (sampling size) of PCM has developed from 14bit to 16bit, 18bit, 20bit to 24bit; The sampling frequency has developed from 44.1kHz to 192kHz. Thus, PCM has become a lossless coding convention because PCM represents the best level of fidelity in digital audio. However, because the input and output need to set the filter adjustment frequency, so the fidelity of PCM encoded audio will be limited. Common file formats for PCM include WAV, APE, and FLAC, all of which are lossless music file formats.
As for the "lossless audio" we often say, it generally refers to the 16bit/44.1kHz sampling rate file in the traditional CD format, which is called "lossless compression" because it contains 20Hz ~ 22.05kHz, a frequency that completely covers the audible range of human ears.
Almost all lossy compression formats are converted from WAV format compression (its internal encoding is still PCM). In the past, many MP3 devices did not support FLAC, APE, AAC and other formats because they did not support decompression of these files. However, so far, no player does not support WAV format, because WAV format itself is PCM stream.
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