WAV, AIFF, and Apple Loeeless are all lossless formats that can be played by Apple nano, iPad, and iPhone.

Many voice compression methods use irreversible compression methods to obtain high compression ratios by reducing data during compression. Reversible compression (lossless compression) is the same as ordinary file compression, and can completely restore the compressed data to the previous data.

In principle, it is a compression method that does not deteriorate the sound quality at all. Since the compression rate is greatly affected by the voice content, it cannot be generalized, but if a music CD, etc. is used as the sound source, compared with other reversible compression methods, it can often be compressed to about half to 1/3.

Extended information:

The commonly seen MP3, WMA, and OGG are called lossy compression. As the name suggests, lossy compression is to reduce the audio sampling frequency and bit rate, and the output audio file will Smaller than the original file.

Another type of audio compression is called lossless compression, which can compress the volume of the audio file into a smaller size while retaining 100% of all the data of the original file, and restore the compressed audio file. Finally, the same size and code rate as the source file can be achieved. Lossless compression formats include APE, FLAC, WavPack, LPAC, WMALossless, AppleLossless, TTA, Tak, TAC, La, OptimFROG, Shorten, and common and mainstream lossless compression formats include APE, FLAC, TTA, and TAK.