What is lossless? Part 2
Lossy compressed sound source ⇒ Typical format: AAC, MP3
Lossy Compressed Sound Font Illustration
A format that cuts out sounds that are difficult for human audiovisual to hear and compresses the capacity to a small size. Sound quality is sacrificed and deteriorated by that amount. Since the data is actually cut, once compressed, the original sound quality will not be restored even if you return to the uncompressed format.
■ What is compression?:
Reduce the capacity of data that contains a large amount of information and preserve it as much as possible.
Also, compression can reduce the load on the terminal, but the quality is lower than the original information because the capacity is reduced.
audio codec
Abbreviation for ALAC
Apple Lossless Audio Codec. Lossless compression audio file format used in “Apple Music” music and video distribution service developed by Apple and iTunes in media player. The extension is “.m4a”. The number of quantization bits is 16, 20, 24, 32 bits. The sample rate supports from 1kHz to 384kHz. (In OTOTOY, the number of quantization bits/sampling frequency supports up to 32 integer bits/384 kHz)
If you compare ALAC with a letter,
write a message on new paper, fold it vertically and hand it to the other party. The person receiving the letter can open it when he knows that it is folded once vertically. However, after the paper is folded, a single wrinkle is formed, and although it cannot be read in the state of new paper, the characters can be read firmly.
Abbreviation for FLAC
Free Lossless Audio Codec. A lossless compressed audio file format provided free of charge. The extension is “.flac”. The number of quantization bits is from 4 bits to 32 bits. The sample rate supports from 1 Hz to 655.3 kHz. (In OTOTOY, the number of quantization bits/sampling frequency supports up to 24bit/192kHz)
If you compare FLAC with a letter, the
situation is similar to ALAC. To explain the difference, FLAC is a state where the card is folded sideways. Also, the recipient can tell that it is folded to one side and open it.
WAV
A type of RIFF (Resource Interchange File Format), which is an audio file format jointly developed by Microsoft and IBM, and defines a method of storing various data in a file. It is generally an uncompressed audio file format, but the data format is free and it is also possible to store compressed data such as MP3 and WMA. In RIFF, the identifier is “WAVE”, but the extension is “.wav”, and it has come to be called WAV to distinguish the pronunciation sound from the web.
If you compare WAV with a letter,
write a message on new paper and deliver it to the other party without wrinkles. The person receiving the letter can read the letters in new paper condition.
