The relationship between MP3 frequencies, bit rates, bit rates, and sound quality

If you want to know the relationship between the MP3 frequency, bit rate, bit rate, and sound quality, the higher the frequency, the higher the bit rate, the better the sound quality. It seems that most of the MP3 frequencies are 44100hz. The bit rate is 128,192.

The frequency mentioned here is the sampling rate, which is usually 44100khz, because it is the standard of music CD.
Every song is captured from Cd, converted into wav files, and then converted into MP3 using lame and other software. So it must be a KHz sampling rate. Unless you are not a song, but recording your own files as WAV Files, and selecting other sampling rates during the recording.
The main impact on MP3 sound quality is bit rate. The best today is the k cbr (fixed bit rate) and VBR (Variable Bit Rate). The VBR file is a little smaller than CBR. K vbrs are the most popular on the Internet and can meet the requirements of sound quality and file size at the same time, but I usually use CD to capture tracks or download ape (lossless compression, can be restored to a WAV file) and then converted to a k vbr.
Finally, I would like to remind you that MP3 transcoding is not authentic, and such distortion cannot be reversed. That is to say, you convert mp3 to WAV sound quality and add the file size? Dozens of times, the sound quality is still MP3.
It's better to listen to CD or download ape if you want to listen to low distortion!
First, sound quality is a very subjective thing!
It is often said that the sound quality is good. One is that the restoration is good, that is, the smaller the difference with the recording, the better. The other is that the sound quality is pleasant. For MP3, MP3 is a compression format. The higher the bit rate, the smaller the compression size, and the less detailed the loss. That is to say, the higher the bit rate, the closer it sounds to the original sound. However, sound quality is also related to your output device. For example, a good MP3 player and a good pair of headphones are helpful for your audio quality!
Therefore, if you want to improve the sound quality, you 'd better not overemphasize any of the above aspects. When you have higher requirements on sound quality, you can discard MP3 and stop CD directly. CD carries waveform files in a completely lossless format, this will produce better results.
If you want to reduce the distortion, increasing the bit rate is the only way. It is best to use a variable bit rate (VBR) to compress the MP3 file to achieve a balance between the maximum fidelity and the minimum file size.
Finally, if you want to completely lossless sound quality, you still have to prepare audio files in lossless compression format or in non-compressed file format.

To what extent is the sound quality of MP3? 128/192/256/320, etc. What are the differences in MP3 sound quality in various compression ratios/compression modes? What are the basic principles? What is the sound quality of APE/WMA/and other formats?
Speaking of MP3, I'm afraid no one has heard of it now. Even if you are not an MP3 user, there are ubiquitous advertisements, promotional activities, and discussions between friends in the city, are you always impressed by the rich resources on the network? For fashion young people, especially those who love music and those who love digital devices, MP3 is a word that needs to be chanted every day, but what exactly is MP3, how can we determine the sound quality of MP3, and how can we hear high-quality MP3 ??? I think the following article will help you solve many questions.
Throughout today's MP3 users, the general production standard recognized by the hacker is the compression of the EAC rail Capture + lame. I also use this combination myself, in this production process, experienced friends will find out some tricks, for different music using different number of bytes settings and compression ratio, from the standard Kbps to the maximum 320kbps, but what are the differences between the effects of these bit rates ?? How is the most suitable compression ratio? CBR and VBR should choose the one that is better and so on. These problems are all discussed at home. In order to find out these details, I made a specific test, I 'd like to share some of my feelings with you.
I like classical music very much at ordinary times. Therefore, I chose the first track of Bach's "The galunburg Piano", where the Bach orchestra played and the rail capture software EAC, the compression software cd'ex and playback software fooba2000 v0.8 are available. the headset equipment of Vivo listener is the e3c of er6 and Scheer of temidea. Due to the fact that there are many details and great bands in classical music, the requirements for sound literacy are higher than those of others, so they can clearly reflect the differences in details between different processing methods.
I first captured the rails with RAC, and then used the lame MP3 encoder (vision 1.92 engine 3.92) engine in the CD 'ex software to process wav files, I have tried one by one to select a good result for the lame Sequence Number:
The first batch number thread priority selects the highest and lowest respectively. If the number of other batch numbers is the same, the compression control is performed. It is found that the degree of thread priority has no effect on the sound, the size of the generated files is the same, and the comparison sounds the same. Therefore, the number of records has no effect on the sound quality.
The second vertex number is version, which can be mpegi, mpegii, or mpegii. v, the same, and the number of other partitions are determined. The three options are respectively compressed three times. After comparison, although the file sizes of the three methods are the same, however, the actual listening experience of mpegi is better, and the compression ratio of the medium and low frequencies is slightly smaller, but the high-frequency distortion is a little more. It is better to listen to people and pop music than to listen to others, the mpegi model is also good for classical listening, and the sound base is better than the upper layer. However, if it is a violin or other high-frequency solo music, mpegii can be recommended. the V type has a better effect than the limit.
The third operator number is the most important. This parameter specifies the bit rate, which directly affects the size and listening of your MP3 file. The distortion with a high compression ratio is large, and the distortion with a low compression ratio is small, but how can we find a balance that we can accept on both sides? This requires careful exploration in the experiment. Considering that Low Bit Rate File sound literacy is not suitable for playing music, the minimum setting is 128 Kbps, the comparison and comparison tests are performed using four fixed bit rates, namely 128, 192, 256, and 320.
The compression ratio of kbps is still rough than that of mixer. The distortion after compression of the high-frequency part is very obvious. It sounds hollow, dry, harsh, and often sound flickering. the texture of the instrument is very poor, some instruments have changed their taste and may even be mistaken. The compressed size of a piece of music with a 3 minute 39 is 3414kb. Although the volume is small, the sound cannot be pleasant and there is a defect that is bigger than that of others.
The compression effect of the 192kbps bit rate is much better than that of 128. First, the sound is solid, at least there is no sense of holes, and the high-frequency distortion is much smaller. The sound is compact, the noise is small, and the data is clean, it achieved the ideal sound contrast effect, only because the compression is better than the limit, and the detailed performance is still not very good. The texture of the instrument, especially the wind instrument, is still very hard and not true, lack of music, the size after compression is 128 kb, I think the compression ratio is ~~ The m MP3 player is better than the 10X player, which can satisfy both the main listening experience and the proper size. The M player can store music for about 95 minutes, 190 m doubles to minutes of music.
The compression rate of 192 kbps is a step higher than that of in terms of sound quality. Taking the first 10 seconds of the music set, the low-frequency obvious particles in the cello are much smaller, the sound is more smooth and natural, and the texture and texture are clearer. There are more details, the atmosphere is rendered more prominent than the others, and the rotation of the voice in the subsequent song is also expressive, the clarity of large signals and small signals is also improved, and the sound is more audible. But at the same time, the file volume is also added at once? It is 256 kb, which is acceptable for 135 MB MP3 players. It is easy to know that the bit rate can store music for about minutes. Generally, it is enough, 192 M is a little small and only supports more than one hour. Therefore, M is recommended.
320kbps is the maximum bit rate provided by lame. The final generated file is 8592kb, which is about 8.4 mb. For 37 MB of wav files, the compression ratio is basically 4.5: 1, however, the generated MP3 file sounds very distorted. Compared with the natural advantage of other bit rates of 320, the sound and details are very delicate, basically, I copied the CD sound quality as it is, especially on a CD player with MP3 playback function. Basically, there is no difference, but I used better-end ear plugs, the compression force is higher than the compression force. In addition, my experience and capabilities in music and equipment are different from those in WAV Files. First of all, compressed MP3 sounds a little shrunk, in general, it is better to compare with other files. Without wav files, it sounds lively and dynamic. In terms of the end details, Pan sound, and space, the degree of separation is not as high as that of wav files, it's just that the tone is already quite close. It's just a little less expressive, and the digital taste is more intense than that of NLP. So if you are using a mini hard-disk Walkman player such as Ipod, I recommend you use a compression ratio of Kbps to get the best listening experience, of course, it is best to directly listen to WAV ~~ There is no compression and no loss. Unfortunately, there is no Walkman supporting the lossless compression of ape. Otherwise, there will be more options.
All of the above are fixed bit rate compression ratios. In lame, this is called CBR (immutable bit rate ), in fact, the biggest feature of lame is that it provides users with a variable bit rate VBR compression method. This method will automatically reduce the bit rate and reduce the file size at some pauses, it is a very good encoding method, but how can we select the lowest and highest bit rate range of the VBR to get the most appropriate file and sound quality? This is another problem that needs to be solved through experiments. Considering the Base Value of kbps, we chose 96 Kbps to kbps for compression. The compressed file size is 1 kb, the CBR of kbps is only kb more than that of kbps, but the sound is definitely improved to a large level. First, the high-frequency distortion is at least half smaller, although there are still a lot of noises in the details, however, the first listener is much stronger than 147 kbps, and the average bit rate after compression is kbps, which is also very space-saving. Then we tested 96 Kbps to 192 kbps, 96 Kbps to 224 kbps, 96 Kbps to 256 kbps, and 96 Kbps to 320 kbps, and found that they are very similar to the maximum CBR compression quality, that is to say, the VBR sound from 96 Kbps to 192 kbps is similar to the kbps of CBR, but the former is 4481kb while the latter is 5123kb in size. Therefore, as a compromise to pursue high sound quality and save space, VBR is very useful. Of course, because the bit rate changes, the stability is naturally a little lower than that of CBR.

Fourth, there are stereo, J-stereo, forced-stereo, and mono in the mode. The standard stereo is the best compared with the benchmark, although the size of the compressed file is the largest, however, considering the differences between small file sizes and sound literacy and listening, we still think that stereo is more ideal than others.

Fifth, there are two compression methods in the software: VBR-old, VBR-new, and the other two. However, there are only the first two methods to use, it is found that the old encoding is still more delicate than the old encoding in terms of sound quality, but the compression speed of the old encoding is very slow, almost the same as 5 or 6 times of the new encoding method, the production of a song is almost the same for 3 or 4 minutes. It is very difficult to use and the file size is about 10%. Therefore, we recommend using VBR-New for your convenience and ease of use.