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About lossless sound quality

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About lossless sound quality

lossless sound quality

In life, many people have questions such as, what is lossless music?

What does 320kbps and 128kbps mean in an mp3 file? If you have a little more fever, what are HiFi, Hi-Res and DSD? How do these music formats work?

The prerequisite for the music to be played on the mobile phone and the computer is that the music (sound) can be stored on the mobile phone and the computer. This may sound like nonsense, but it begs the question: how is sound stored in a computer for something that we can only hear but cannot understand?

Some basic technical knowledge about “digital music”

Computers store information through “binary numbers”, that is, any information in the computer exists in the form of “a sequence of 0 and 1” (such as 100101000110101), and the difference in “sequences of 0 and 1” leads to the information content is different.

It’s easier to understand with a real-life example: For the English language, information can be represented in the form of twenty-six letters, which are then stored on paper. The content is different. A computer only knows two “letters”, 0 and 1, and uses 0 and 1 to store information. For example, the letter “a” is stored as “01100001” on the computer.

The question then is: How do we translate the sound into a “permutation of 0 and 1”? by

To solve this problem, we must first look at the nature of “sound”. We already learned in physics in high school that the essence of sound is not the “sound” that our ears hear, but the “vibration that propagates” in objects.

We perceive this vibration and translate it into the sound we hear through the brain. Most of the physics professors at that time showed us transverse waves that transmit vibrations like water waves

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What is the difference between lossless sound quality and normal sound quality?

When downloading music, we often see these options: lossless sound quality and normal sound quality.

The lossless sound quality must be superior to the normal sound quality, according to many people, although many times it has been doubted, even using tests so that people choose which one they think sounds better, then, what are the differences between them?

Different compression encoding methods

The commonly seen mp3, wma and ogg are called lossy compression. As the name suggests, lossy compression is to reduce the audio sample rate and bit rate, and the output audio file will be smaller than the original file, which is common sound. quality that we often see.

Another audio compression is called lossless compression, which can compress the volume of the audio file to a smaller size on the premise of saving 100% of all the data in the original file. Same size, same bitrate. Lossless compression formats include ape, flac, wav, wavpack, lpac, wmalossless, applelossless, tta, tak, tac, la, optimfrog, shorten, and currently common and conventional lossless compression formats include ape, flac, tta , tak, wav, generally , CDs are lossless music.

different file sizes

Common mp3, wma and other formats occupy about 1m to 5m of space for one-handed songs, while for music in lossless formats such as ape and flac, the space occupied by a single song can generally reach tens of megabytes, or even more. of 100m.

lossless music

Lossless music is a kind of music file playback format, which is divided into two types: lossy compression and lossless compression.

However, due to data loss in the audio digitizing process, it is actually impossible to achieve true lossless.
chinese nameintact musicexplainMusic file playback formatApplication fieldmusicClassificationLossy and lossless compressionaudio compression codeFLAC
content

type of sound
Commonly seen MP3, WMA, and OGG are called lossy compression. As the name implies, lossy compression reduces the audio sample rate and bitrate, and the output audio file will be smaller than the original file. . Another audio compression is called lossless compression, which can compress the volume of the audio file to a smaller size on the premise of saving 100% of all the data in the original file. Same size, same bitrate. Lossless compression formats include APE, FLAC, WavPack, LPAC, WMALossless, AppleLossless, TTA, Tak, TAC, La, OptimFROG, Shorten, and common and conventional lossless compression formats include APE, FLAC, TTA, TAK.
General WAV CD can capture this music format. However, due to the high volume and uncompressed original audio, it can usually be compressed and converted to FLAC or APE at a lower volume. Note: wav is still a lossless format, and the last two are lossless compression formats
encoding format
BOW
APE is one of the popular digital music file formats. APE is a lossless audio compression technology, that is, after compressing the audio data file read from the audio CD in APE format, you can restore the file in APE format, and the restored audio file is the same as the original. compressed audio file. Exactly the same as before, nothing to lose. [one]
FLAC
FLAC is short for Free Lossless Audio Codec [2] , which can be interpreted as Chinese lossless audio compression coding. FLAC is a well-known free audio compression codec, which is characterized by lossless compression. Unlike other lossy compression codes such as MP3 and AAC, it does not destroy any original audio information, so it can restore the sound quality of music discs. It has been supported by many software and hardware audio products since 2012.
FLAC is similar to MP3, but it has lossless compression, which means that the audio is compressed in FLAC without losing any information. This compression is similar to Zip, but FLAC will give you a higher compression ratio, because FLAC is a compression method specially designed for the characteristics of audio, and you can use the player to play FLAC compressed files like you normally play MP3 files (many Car players and home audio devices already support FLAC, and you can find links to the manufacturers of these devices on the FLAC website).
FLAC is free and is supported by most operating systems, including Windows, “unix” (Linux, BSD, Solaris, OSX, IRIX), BeOS, OS/2, and Amiga. And FLAC provides a build system in autotools, MSVC, Watcom C and ProjectBuilder development tools.
WAV

The WAV format is a sound file format developed by Microsoft, also known as a wave sound file. It is the first digital audio format and is widely supported by the Windows platform and its applications. The WAV format supports many compression algorithms, supports a variety of audio bits, sample rates, and channels. It adopts a sampling frequency of 44.1 kHz and a quantization number of 16 bits. Therefore, the sound quality of WAV is almost the same as that of CD, but WAV format requires too much storage space, it is very inconvenient to communicate and broadcast.
WAV’s full name is Wave Audio Files, and WAV is derived from sampling analog waveforms of sound. Sampling the analog waveform of sound with different sampling rates can obtain a series of discrete sample points, convert the values of these sample points into binary numbers with different quantization bits (8 bits or 16 bits), and then store them in the disc, this produces a WAV file of the sound, a wave file . Microsoft Sound System Sound Finder software can convert AIF , SND and VOD files to WAV format.
This format records the waveform of the sound, so as long as the sample rate sample rate