Audio technology was invented to record, store and play back acoustic phenomena, so understanding acoustic phenomena first is very helpful for learning digital audio.
Audio Coding
For example, the quantization format is 2 bytes, the sampling rate is 44100, and the number of channels is 2. These information describe the sound quality of the CD. Then the data sampling rate of the CD = 44100*16*2 = 1378.125kbps. In 1 minute, the storage space required = 1378.125 * 60/8/1024 = 10.09MB. It is not small.
Compression algorithms include lossy compression and lossless compression.
Commonly used audio encoding methods are as follows:
MP3, MPEG-1 or MPEG-2 Audio Layer III, is a once very popular digital audio encoding and lossy compression format, which is designed to significantly reduce the amount of audio data.
AAC, Advanced Audio Coding, is an audio coding technology based on MPEG-2, developed by Fraunhofer IIS, Dolby Laboratories, AT&T, Sony and other companies and launched in 1997. AAC has a higher compression ratio than MP3, and the sound quality of audio files of the same size is higher.
WMA, Windows Media Audio, is a digital audio compression format developed by Microsoft, which includes lossy and lossless compression formats.
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