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What is the difference between standard sound quality, high definition sound quality and lossless sound quality?

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What is the difference between standard sound quality, high definition sound quality and lossless sound quality?

Standard sound quality: 128 kbps (bit rate)

HD sound quality: 320kbps

Lossless sound quality: 1411 kbps (below CD sample rate)

The first two are what we always call mp3, and the lossless music formats are mostly wave, flac, aiff, etc.

1. Size difference: 1 3 minute pop song, about 3mb for 128k, about 7.5mb for 320k, and about 30mb for lossless. (The standard sample rate is 44100 Hz, which is the same as a CD; many songs are recorded with a sample rate of 192 kHz, 96 kHz, which will be reduced to a standard 44100 Hz, 16-bit in the final mastering process )

2. Difference in sound quality: the high-frequency part of lossy music will be weakened, and listening to good monitoring headphones will feel the sense of space is reduced, in fact, the so-called music compression is to compress its bass -frequency and high frequency, so the compressed The frequency response range of music is not as wide as lossless.

Some also have popping noises. Use a professional sound card to listen to a song, well-made lossless music, the sound card will not jump red, but listen to mp3, the sound card will jump red, although it is not explosive.

Audio files can be divided into two types:

With losses and without losses.

If a song is recorded and played without compression, the hard drive space occupied by multiple songs is equivalent to a movie.

Why bother?

So the vast majority of the audio we hear is compressed.

Compression is further divided into lossless compression and lossy compression.

The so-called lossless compression is equivalent to,

A very long book

So we replaced the long and repeated names of people and places in the book with symbols,

The book is then marked with the names of people or places represented by all these symbols.

Wouldn’t this be shorter?

But even though it was hard to read, the content was not missing at all.

This is “lossless”.

The so-called lossy compression is equivalent to,

A very long book

So we use the lossless method above to compress first,

Then remove those modifiers that are not very important directly,

Even some wordy plots have been removed.

Of course, this compression is more effective.

But it would also leave the book incomplete.

This is “lossy”.

I just make a very intuitive example for your understanding.

Of course, this statement is not very professional.

And what you said about SD and HD,

It is the level of lossy compression.

The difference between SD and HD is like:

A book has just removed the description of the appearance of the passerby.

Another book directly removed the bystander’s irrelevant plot.

What would you say is the difference between the two books?

You can try to buy a good pair of headphones,

Then download HD and SD of the same song,

Compare and listen.

The difference is still quite obvious.

The difference between HD and lossless is more difficult to distinguish.

Maybe my ears aren’t sharp enough

I can’t tell the difference between 320kbps and lossless mp3 audio.

Therefore, it is recommended that the theme owner download the HD version.

The general audio website high definition refers to the 320 kbps mp3 format.

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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, lossless sound quality requires members to download, otherwise only normal sound quality can be downloaded. Since it is a fee, the lossless sound quality must be higher than the normal sound quality, so what are the differences between them?

Commonly seen MP3, WMA, 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 normal sound quality. we often see.

Common MP3, WMA and other formats occupy about 1 to 5 million space for single-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 than 100M.

Bit rate (Kbps) refers to the transmission rate of digital signals, that is, how many thousands of bits of information are transmitted per second (K means thousands of bits, Kb means how many thousands of bits). For music, theoretically this The higher the value, the better the sound quality. Ordinary music, such as WMA, is generally 128kbps music, MP3 is mostly 128, 192, or 320kbps/, while the bit rate of lossless music generally reaches 800-900kbps, and traditional CD even reaches 1411 Kbps. Using lossless compression, the sound quality is the most perfect.

The feature of lossless music is that no matter there is sound between the beats, its data always flows smoothly, so the fast magnetic vibration in your earphones is stable and the sound is natural and real; while lossy formats like MP3 are due to loss of people. The ear cannot hear part of the data, so the magnetic block in the earphone vibrates unnaturally, causing it to vibrate when there is sound and not vibrate when there is no sound. In this way, the magnetic block vibrates excessively and unevenly, which will produce a burr noise. If professional equipment is used, it can be easy to hear right and wrong.

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

What is the difference between lossless sound quality and normal sound quality? Part 2

different bit rates

Bit rate (kbps) refers to the transmission rate of digital signals, that is, how many thousands of bits of information are transmitted per second (k means thousands of bits, kb means how many thousands of bits). , the better the sound quality. Ordinary music, such as wma, is generally 128kbps music, and mp3 is mostly 128, 192, or 320kbps/, while lossless music’s bit rate generally reaches 800-900kbps, and traditional CD even reaches 1411 kbps. The quality is the most perfect.

different sound

The feature of lossless music is that no matter there is sound between beats, its data always flows smoothly, so the fast magnetic vibration in your earphones is stable, and the sound is natural and real; while lossy formats like mp3 are due to loss of people ear can’t hear some of the data, so the magnetic block in the earphone vibrates unnaturally, causing it to vibrate when there is sound, and do not vibrate when there is no sound, so the magnetic block vibrates excessively and unstable, which will produce burr noise. If using professional equipment, it can be easy to hear right and wrong.

Of course, whether you can hear the difference depends on the person, and there are differences in everyone’s speech recognition ability. Some professionals and those with sensitive hearing will find that there are differences, but for most common listeners, in fact, there is no difference between the lossless sound quality of normal and flac mp3, and the effect is similar.

We commented at the beginning that massive tests have been carried out on many people and 99.99% have not been able to recognize between an mp3 with good sound and a kbs of 192 or higher and a lossless.

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.