A summary of audio production is the knowledge and understanding of audio production

The general method of obtaining audio data is to use a fixed time interval to sample (quantize) the audio voltage, and convert the results to a certain resolution (for example: each CDDA sample is 16 bits or 2 words section) storage. The sampling time interval can have different standards, such as CDDA using 44100 times per second; DVD using 48000 or 96000 times per second. Therefore, sample rate, resolution and number of channels (e.g. 2 channels for stereo) are key parameters of audio file formats.

What needs to be distinguished is that audio files and codecs are different. Although one audio file format can support multiple encodings, such as the AVI file format, most audio files only support one audio encoding.

There are two main types of audio file formats:

Lossless formats, such as WAV, PCM, TTA, FLAC, AU, APE, TAK, WavPack (WV)

< p>Lossy formats such as MP3, Windows Media Audio (WMA), Ogg Vorbis (OGG), AAC

Lossy file formats are models based on acoustic psychology that are difficult or impossible for humans to hear except For example, a high-volume sound is followed by a low-volume sound. MP3 belongs to this category of files.

The compression ratio of lossless audio formats (such as TTA) is about 2:1. There will be no data/quality loss during decompression. The data generated by decompression is exactly the same as the uncompressed data. If you need to maintain the original quality of your music, you should choose a lossless audio codec. For example, using the free TTA lossless audio codec you can store the equivalent of 20 CDs of music on a DVD-R disc.

So it is not difficult to understand the algorithm of flac audio format. In fact, there is no specific ratio. The sampling rate and resolution of each song are different!

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