Just as many people used to use a dozen keyboards to make do with it, and now it’s not a mechanical keyboard, people’s demand for song sound quality has gone from "sounding sound" in the past to deliberately pursuing the so-called " Lossless sound quality".
But despite saying that, many people don't know much about lossless audio. So let's find out more.
If you only talk about the purest definition, then the so-called "lossless" means uncompressed music. A professional explained: "Lossless audio is the unmodified output of the sound recording process, and is the most accurate output reproduction of the existing recording process."
This means that, theoretically, it must perfectly record the sound details and sense of space to bring the feelings and emotions that music performances need to express.
However, the problem is that this theoretically complete losslessness brings about excessive occupation of storage space, and in many cases this occupation is meaningless, because people often need to put as many audio files as possible in wired space.
Our common studio quality lossless audio formats are AIFF and WAV. As we all know, their volume is not small, so the so-called "lossless compression" was born.
So is lossless compression lossless? Yes. Because the compression process of lossless compression is reversible, lossless compression formats can also be counted as lossless. At this point, our common lossless audio formats include the open source lossless format FLAC, Apple's lossless format ALAC, and Monkey's Audio's APE.
Although there is a metaphysical argument that the lossless compression format can no longer be considered lossless because it loses some subtle information details, but at least it is technically impossible to prove this.
In fact, what we usually say "lossless" refers to lossless compressed audio, which is reduced in size to cope with narrower bandwidth transmission, and then recombined, while retaining all the information.
To a certain extent, it is very similar to the familiar ZIP archive-a file or multiple files can be compressed to be smaller than the original, but it can be restored.
The compression mechanism of this type of file format is as follows:
They use compression algorithms to "squeeze out" the silent part of the music, but they will not compress the actual music content or delete any data. This is different from files such as MP3. This type of lossy music format will remove the audio files. The amount of information.
In this era when we have no worries about storage space and internet speed, these complicated processes seem meaningless, but in the past, making music files as small as possible was a very real problem.
High-resolution audio?
In addition to lossless audio, now we can often come into contact with another term: High ResAudio.
Do these two nouns mean the same thing? Not really.
High-resolution audio is much higher than MP3 in terms of information, and even better than CD sound quality. Its design purpose is to make the sound quality of the audio as close as possible to the quality of the master disc, but its volume will not be incredible.
In fact, many companies in the industry have confused the concepts of lossless and high resolution. Many manufacturers like to call the CD audio format "lossless", and the higher sampling rate than the CD format is called "high resolution".
However, technically speaking, only the original, unmodified and adjusted recorded audio can be truly "lossless".
But since the industry has generally given a new definition of "lossless" and "high resolution", we don't need to be too entangled with these things.
Generally speaking, the analog frequency response of so-called high-resolution audio must reach at least 40kHz, and the bit depth and sampling of the file must reach at least 24-bit96kHz.
Therefore, many people often refer to high-resolution audio as 24/96. However, you can actually find audio files at the level of 24/192 or even 24/384.
Bit depth and sample rate
We just mentioned the terms bit depth and sampling rate. What do they mean? Let's start with bit depth first.
Bit depth is used to define the so-called dynamic range, or more simply, the difference between the loudest sound and the lightest sound. Each "bit" represents 6dB (decibel) in the dynamic range, so 16-bit depth means that its dynamic range is a difference of 96dB. Similarly, 24-bit depth is 144dB.
There is no doubt that the larger the dynamic range, the better, because the greater the difference between the two extremes of sound loudness, it means that people can experience more emotional ups and downs when listening to some music, especially classical music-of course Yes, this requires the support of the playback device.
Then let's talk about the sampling rate. Analog audio is embodied in waveforms, so when it is converted into a digital signal, a microphone samples it at fixed time intervals. The frequency of sampling is the sampling rate, for example, 1Hz means sampling once per second.
Because at least two samples can form a waveform, this means that to restore a 40kHz high-resolution signal, the required sampling rate is at least 80kHz.
It is worth mentioning that CD audio is generally 16-bit/44.1kHz. We only need to know that the sampling rate represents the amount of information in the audio.
How to listen to them
High-resolution music was originally stored in the form of DSD files on DVD-A or SACD discs, and only some devices that support this type of media can play it. Interestingly, Sony's UBP-X800 Blu-ray player can also play SACD.
It is worth mentioning that, considering the huge volume of high-resolution audio and the increasingly faster internet speeds, this type of music has now begun to gradually turn to the Internet for download, rather than just a simple CD carrier.
In terms of streaming media services, some foreign platforms are now beginning to provide high-resolution music listening. Unfortunately, the streaming services of major manufacturers such as Apple and Amazon do not yet provide high-resolution streaming.
As for lossless music, its threshold is much lower. However, because this type of format requires the playback device to have the ability to decode files, not all electronic devices that can play audio support lossless formats.
So in many cases, you can only see lossless audio support on specialized players or a few smart phones that sell music. Of course, the PC is not a problem at all.
However, it is said that both LG and Samsung have begun to make their smartphones capable of high-resolution playback. The potential of these high-quality solutions in the future is great.
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