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Which format has the best sound quality for music?


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Which format has the best sound quality for music?

Music Format
Music Format

 

PCM, the highest level in audio files, is the ancestor of all digital audio (not including analog), with the highest fidelity and high volume.

Music Format
Music Format

Common formats include pcm and cda, which are primarily used to burn records as CD files. CD is not a format, it is a standard, please refer to the official red book published by SONY (Sony) for details. It could be on a common CD-ROM, which was later modified) and cannot be saved as format.
Therefore, it must be said that PCM format has the best sound quality, but its volume is extremely large, so it generally uses WAV as the original file to save audio files, the quality is also quite high, the loss is almost quite small, but the volume is relatively large. This is a format developed and illustrated by Microsoft, which is suitable for Windows operating systems and can also be used on the latest MAC systems. Extension: .wav
is the original audio format dedicated to the MAC system, it is AIFF, the extension is Aiff, which was independently developed by Apple and is very common on Mac. That said, this is the best format (except PCM) on a Mac.
On Unix and Java platforms (which mostly refer to SUN platforms), the corresponding format is AU and the extension is au. It is currently the standard audio format under Unix and Java.
The above formats are all original file formats, which are usually huge in size. In order to facilitate transmission on computers, people have developed compression formats. Compression is divided into lossy compression and lossless compression. Obviously, lossy compression has a higher compression rate, but it requires The problem to be solved is how to solve the sound quality problem. The usual practice is to sacrifice the part that the human ear cannot hear, but the human ear is very different, so it is difficult to care for all people. Among the song formats, the best ones are flac (lossless, flac extension), Monkey’s Audio (lossless, ape extension), DTS (multichannel, mainly used with DVD, dtc/wav extension), AC3 (released by Dolby, multichannel surround , realistic sense of presence, extension ac3), AAC (loaded, good sound quality, extension Aac or mp4), WMV (this is also a video format, an improved version of wma and asf, quality is comparable High, extension wmv), as well as MusePack (mpc extension, completely free) and MP3Pro (mp3 extension) are also quite good, these formats are quite high in sound quality, even for users who require not bad sound. Also, the most popular formats are mp3 and ogg, as well as SONY’s special ATRAC/ATRAC3 format, which is dedicated to MD. These effects are also good and are more common on the Internet, but the effect is obviously not as good as the formats mentioned above.
As for rm and wma, because the compression is too high, the sound quality is really unflattering, especially those that circulate on the Internet, which are lost and cannot be lost anymore, so it is highly discouraged.


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What music format has the best sound quality?

What music format has the best sound quality?

Music Format
Music Format

When I want to download songs, I always feel that the sound quality is not so pure, it seems a bit muddy, what format is good to listen to?

Music Format
Music Format

There are three lossless music quality formats: ape, wav and flac.

APE is one of the popular lossless compression formats for digital music. Due to its early appearance, it has a wide user base all over the world, especially in mainland China. Lossless compression formats such as APE use a more refined recording method to reduce volume, and the restored data is the same as the original file, ensuring file integrity.

WAV is a sound file format developed by Microsoft. It complies with the RIF file specification and is used to store audio information resources on the Windows platform. It is widely compatible with the Windows platform and its applications. This format supports a variety of compression types. algorithms and supports multiple WAV file with standard format is the same as CD format, with 44.1K sampling frequency and 16-bit quantization number, so the sound file quality is almost the Same as CD.

Chinese translation FLAC is a 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 data, so it can restore the sound quality of music discs. It has been compatible with many software and hardware audio products (such as CDs, etc.) since 2012.

Audio digitization: how it works

Audio digitization: how it works

Audio digitization

 

How to translate sound into 0s and 1s without soul? . Let’s take a look at familiar devices: how computer sound, video, MP3s, streaming and streaming work, various algorithms, and more.

Audio digitalization

 

a bit of physics
Sounds are vibrations in the air. Like waves in the water, in the air. Air pressure enters the ear, which has sensitive parts that can subtly sense vibrations in the air. These vibrations are perceived by people as sounds. There is no sound in outer space because there is no air.

frequency. The faster the vibration, the weaker the sound we perceive. A person perceives vibrations that range between 20 and 20,000 vibrations per second. In other words, this is called the oscillation frequency: Hertz. That is, the range we hear is from 20 Hz to 20 kHz.

By comparison, dogs hear frequencies from 40 Hz to 60 kHz, so humans don’t perceive a dog’s whistle, but dogs can hear it. The sound of a dog whistle is only in the 23-54 kHz range.

amplitude. The stronger the vibration, the stronger the sound and vice versa. You can think of this as the height of the waves on the surface of the pond: there may be small ripples (soft sounds) or there may be large powerful waves.
Divide the sound into segments.

 

 

Now let’s do this: We divide the second part into 4 parts and find the magnitude value for each part:

 

We measure the state of the quadratic wave in one second. This is called sampling.

We measured the magnitude of each of the four points and, in relative terms, we got four numbers: +30, -50, -50 and -60. In theory, if we were to pass current and apply these four voltages to the speaker, we would be able to reproduce the same sound. But there are several problems:

• Since we only measure in four places, all oscillation is lost.
• We ended up with a very distorted sound compared to the original.

Sampling at a rate of 4 is too little for the sound. To get at least intelligible speech, one second must be divided into 8,000 segments, and for music, 41,000 segments are usually sufficient.

Let’s increase the sample rate: cut the sound into smaller parts in the same unit of time:

 

Measurements are now more accurate and the resulting sound is more natural.

convert to number
After dividing the sound into small segments and measuring the amplitude value of each segment, we can record it in table form:

Time ⠀⠀⠀⠀⠀ Amplitude

0.01 seconds. ⠀⠀⠀⠀ 5

0.02 seconds. ⠀⠀⠀⠀ 7

0.03 seconds. ⠀⠀⠀⠀ 10

If we divide the whole sound into equal segments, then the time cannot be written, since we know how it changes, it is enough to write the amplitude value on a line:

5 7 10 … −21