Tag: does bitrate affect audio quality

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What is the music bitrate for better sound quality? Audio bit rate

How should the bitrate be interpreted in an audio file?

That is, the higher the bitrate, the better the audio and video quality, but the larger the encoded file, the lower the bitrate, the situation is reversed. For example: encode audio and video at 500 Kbps. Where bps is bit 1K=1010=1024 b is bit (bit) s is second (second) p is per (per) So encoding with 500 kbps means that the encoded audio and video data need to use 500K bits per second to Indicates that the bit rate is used to represent the code rate of information transmitted in the baseband transmission system. The bit rate Rb refers to the number of binary bits transmitted per unit of time, and the unit is b/s. For example, the transmission code rate of a computer serial port is up to 115200b/s. The symbol rate or baud rate Rs refers to the number of modulation symbols transmitted per unit of time, that is, the information transmission rate of ternary and more than ternary digital code streams, and the unit is baud/s In M-ary modulation, bit The relationship between the rate Rb and the baud rate Rs is: Rb=Rslog2M In a word, the bit rate indicates the amount of data transmitted per second.

What is the proper bit rate for mp3 music files?
Bitrate is simply the number of bits per second transmitted by the media file and the unit is Kbp/s. The default bit rate of compressed MP3 files is 128 Kbp/s and the sound quality is similar to that of a CD. However, the bit rate of MP3 downloaded from the Internet is usually 192 Kbp/s, the sound quality of 192 Kbp/s is better than 128 Kbp/s, and the space occupied by the file is not too large, so which is widely used. . However, if you want to get better sound quality, the bit rate should be higher than 320Kbp/s, and the sound quality can be really comparable to CD quality. However, the price you pay for doing this is that one song will take up about 10M of hard drive space. Generally speaking, the higher the bitrate, the better the sound quality, but it will take up more disk space.

What does “bitrate” mean in audio?
For example, 128kbps MP3 means that the amount of information per second is 128kb converted into bytes is 16KB 320kbps MP3, so the quality does not improve, on the contrary, it may decrease. There are also lossy compression formats such as MP3, wma, ogg .. These are lossy compression formats, which means that there will be loss in the compression process, but each compression algorithm is different, and the quality of the compressed sound is different. For example, when comparing the same bit rate, the sound quality of different formats is different. Hope it can help you.

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Audio Bitrate: What is the music bitrate for best sound quality?

Bit rate refers to the amount of binary data per unit of time after converting an analog sound signal to a digital sound signal.

The higher the bitrate, the better the sound quality (under the same encoding format, different formats cannot be compared). audio bitrate. Bit rate is a benchmark of digital music compression efficiency. Bit rate indicates the rate of the number of bits bps (bit per second, bits per second) transmitted in a unit of time (1 second).

Kbps (in layman’s terms is 1000 bits per second) is usually used as the unit. The bit rate of digital music on CD is 1411.2 kbps (i.e. to burn 1 second of CD music, 1411.2 × 1000 data bits are required), the high bit rate of the music file means that the data must be processed in a unit of time (1 second) The amount (BIT) is large, that is, the sound quality of the music file is good.

However, when the BITRATE is high, the file size increases, which will occupy a large amount of memory capacity. ranges in this sense, most of them are 32-256 Kbps. Of course, the wider the index, the better, but 320 Kbps is the highest level for the moment.

What do sample rate and bit rate mean in a song?

Bit rate Bit rate refers to the sampling rate at which digital sound is converted from analog to digital format. The higher the sampling rate, the better the quality of the restored sound.

The bit rate value is compared with the actual audio: 16 KBPS = phone sound quality 24 KBPS = increase phone sound quality, shortwave transmission, longwave transmission, European standard medium wave transmission 40 KBPS = American Standard Medium Wave Broadcast 56 KBPS = Voice 64 KBPS = Voice Boost (best bitrate for mobile phone ringtones)

setting value, the best setting value of mobile phone mono MP3 player) 112 KBPS = FM radio stereo FM 128 KBPS = tape (best setting value of mobile phone stereo MP3 player, best setting value of low-end MP3 player) 160KBPS=HIFI HIFI (best setting for mid to high end MP3 players) 192KBPS=CD (best setting for high end MP3 players) 256KBPS=Studio Music Studio (for music enthusiasts )

Sampling rate is when the analog signal is converted to a digital signal Sampling rate is related to sound quality. The higher the sample rate, the better the high-frequency restoration of the sound file. The following is the different quality corresponding to different sampling rates 1.11,025Hz

The sound of this sample rate is similar to the sound quality of AM radio 2.22,050Hz The sound of this sample rate is similar to the sound quality of FM radio, but lower than 3.32,000Hz This sample The sound of this frequency is superior to the sound quality of FM 4.44 100 Hz broadcast

The sound of this sampling rate reaches the sound quality of CD audio 5.48,000Hz The sound of this sampling rate reaches the sound quality of DAT audio 6.96,000Hz

Sound of this sample rate reaches DAT audio sound quality The higher the DVD audio sound quality sample rate, the larger the disk space occupied by the final sound file. Usually we can choose 44.1KHZ sampling rate.

Is there a relationship between the frequency, bit rate and sound quality of an MP3? Part 7

Fifth, the compression method, there are vbr-old, vbr-new and two others in the software, but only the first two are easy to use.

 

Comparing old and new vbr encoding methods, I found that the assumption is that in terms of sound quality, it’s still the old one. Delicate, but the compression speed of the old encoding is very slow, almost equal to 5 or 6 times that of the new encoding method. The production of a song is almost the same. in 3-4 minutes, which is very difficult to use, and the file size is also 10% larger, so it is recommended to use vbr-new for everyone, which is more convenient and easy to use.

In short, we can say that there is an intimate relationship between the sampling rate and the bit rate to directly impact the quality of the audio, especially in formats such as mp3.

We have already said, in other articles, that an mp3 -which is a compression method that discards information- at high sampling rates (48 thousand 0 44100 samples) and a bitrate of 256, is almost impossible to distinguish, for most of them. people, from the original audio without any compression.

The relationship between frequency, bit rate and sound quality of MP3 Part 5

The above is the fixed code rate compression ratio. In lame, this is called CBR (ie non-variable code rate). In fact, the most important feature of lame is that it provides users with a VBR variable code rate compression method.

 

This method is a very good encoding method in some pauses, and the simple signal will automatically reduce the bitrate and reduce the file size. However, how to choose the lowest and highest VBR bitrate range to get the most appropriate file and sound quality? This is another problem that needs to be solved through experimentation. Considering 128kbps as the base value, we choose 96kbps to 160kbps as the compression range. The compressed file size is 3801kb which is just over 128kbps CBR. 387 kb, but the sound is definitely improved by a great deal. First, the high-frequency distortion is at least half as small. Although there is still a lot of noise in the details, the first listening sensation is much stronger than 128 kbps. The average code after compression speed is 147 kbps, which is also very space efficient. Then experiment with 96kbps to 192kbps, 96kbps to 224kbps, 96kbps to 256kbps, 96kbps to 320kbps, and found that they are very similar to the maximum CBR compression sound quality, i.e. 96kbps to 192kbps vbr sound is similar to 192kbps of cbr, but the former is 192kbps, 4481kb in size and the latter is 5123kb, so as a compromise method looking for higher quality sound and saving space, vbr is really useful. Of course, on the other hand, because the code rate changes, the stability is naturally slightly worse than cbr.

Fourth, in terms of mode parameters, there are stereo, J stereo, forced stereo, and mono. The comparison test shows that standard stereo has the best effect. Although the compressed file size is the largest, the file size difference is smaller, and the difference in sound quality and sense of hearing, I still think stereo is ideal.

What is the proper audio bitrate for uploading a video?

When recording gameplay videos and putting them on the Internet, the bit rate used to suppress the video depends on the end use.

Generally speaking, when uploading to online video website, it is recommended that the video be encoded by H264/X264, the video bit rate should be 1600Kbps; audio must be AAC encoded and audio bitrate must be 128 Kbps.

If you plan to put it on the network drive and share it with friends, it is recommended to use a higher bit rate. For example, the video is encoded by H264/X264 and the video bit rate is 2400Kbps; the audio is AAC encoded and the audio bitrate is 128 Kbps.

What does audio bitrate mean?

The bit rate is the number of data bits transmitted per unit of time during data transmission, generally the unit we use is kbps, that is, kilobits per second.
The popular understanding is the sampling rate. The higher the sample rate per unit of time, the higher the precision and the processed file will be closer to the original file, but the file size is proportional to the sample rate, so almost all encoding formats are used. attach. The importance of This is how to use the lowest code rate to achieve the least distortion. The cbr (fixed code rate) and vbr (variable code rate) derived from this core are all items in this regard, but things are not absolute, In terms of audio, the higher the bit rate, the lower the compressed ratio, the smaller the sound quality loss and the closer it is to the sound quality of the audio source.
Basically, the sound quality of the two data 44.1 and 128 in the MP3 song attribute is very good.

Are higher audio bitrates better?

Encoding rate (Kbps)*total song length (seconds)/8=file size (KB), if divided by 1024, is the size in MB.
MP3 is lossy compression, the smaller the file, the higher the loss. The relationship between bitrate and audio and video compression is simply that the higher the bitrate, the better the audio quality and video, but larger is the encoded file; yes The opposite is true for lower bitrates.
Bit rate refers to the sampling rate for converting digital sound from analog to digital format. The higher the sampling rate, the better the quality of the restored sound.
The bitrate value is compared to the actual audio:
16 Kbps = phone sound quality
24 Kbps = improve phone sound quality, shortwave transmission, longwave transmission, European standard medium wave transmission
40 Kbps = American standard medium wave transmission 56 Kbps
= voice
64 Kbps = voice boost (best bit for mobile phone ringtones) = tape (best setting for mobile phone stereo MP3 player, best setting for low-end MP3 player
112 Kbps = FM stereo transmission FM 128 Kbps ) 160 Kbps = HIFI HIFI (best setting for mid-range MP3 player to high-end MP3 players) 192 Kbps=CD (best setting for high-end MP3 player high ) 256 Kbps= Studio Music Studio (for music enthusiasts) In fact, with the advancement of technology, bit rates are also getting higher and higher, with MP3 having a maximum bit rate of 320 Kbps, but some formats can achieve higher bit rates and superior sound quality. For example, the emerging APE audio format can provide true audiophile-level lossless sound quality and smaller volume than WAV format, and its bit rate is typically 550kbps.

The ratio of frequency, bit rate, bits rate and MP3 sound quality Part 4

Compared to 192, the compression rate of 256 kbps is naturally a higher step in sound quality.

Take the first 10 seconds of the track, the low frequency of the cello is obviously less granulated and the sound is softer and more natural. The texture is also clearer, the details are much more, the representation of the atmosphere is more prominent, the rotation of parts in the following songs is also more expressive, the clarity of the large and small signals, and the sound is also improved It is more careful and audible, but at the same time, the file size also increases at 6831 KB at a time, which is still affordable for an MP3 player of 256 m. It is not difficult to calculate that it can store about 135 minutes of music according to the Bit rate of 256. In general terms, it is enough, 128 m is a little less and can only support a little more than an hour, so it is recommended to use a Bit rate of 192 for 128 m.

320 Kbps is the maximum bit rate that LAME can provide. The final generated file is 8592 KB, which is approximately 8.4 M. Compared to 37 m from the WAV file, the compression ratio is basically 4.5: 1, but the generated MP3 file sounds very distorted compared to others Bit rates, the natural advantage of 320 is obvious. The bell, the details, etc. They are very delicate. Basically it achieves the sound quality of the original copy of the CD, especially in the CD player with the MP3 playback function. There is no difference, but I used earplugs relatively high-end ears with high resolution, in addition to my experience and skill with music and team, I can still hear much difference compared to the WAV file, first, the sounds MP3 tablets. a little different. The sensation of contraction is relatively dry in general. Without the WAV file, it sounds fresh and dynamic. In terms of final details, nuances and sense of space, the degree of separation is not as high as the WAV, but it is quite similar in terms of a ringer, it is a little less expressive and the digital flavor is relatively strong. Then, if you are using a miniature hard drive as an iPod, I recommend that you use a compression ratio of 320 kbps, you can get the best auditory experience. Of course, listen to WAV directly is the best ~ ~ without compression, without loss, but unfortunately there is no Walkman who admits compression without loss as APE, otherwise, there will be a variety of options.

The ratio between frequency, bit rate, bit rate and sound quality of MP3 Part 3

First I took the track with RAC, and then I used the MP3 LAME encoder (VISION 1.92 Motor 3.92) engine in the CD’EX software to process the WAV file. I tried the parameters lick one by one to choose a good effect:

The first thread priority parameter selects the highest and the lowest respectively. When other parameters are equal, the comparison is compressed. It is found that the degree of thread priority has no effect on sound. The size of the files generated is the same. , and the comparison sounds the same, so this parameter has no effect on sound quality.

The second parameter is the version, which can be selected from MPEGI, MPEGII and MPEGII.V. The same, other parameters are determined and these three options are used to compress three times. The size is the same, but MPEGI’s real listening direction is better. The medium-low frequency compression ratio is a bit smaller, but high frequency distortion is a bit more. It is more suitable for listening to human voice and pop music. For classical music, use the MPEGI type. It is not bad, the sound is better, but if it is solo music with many medium and high frequencies such as the violin, it is recommended to use the MPEGII.V type, which will have better results.

The third parameter is the most important, which is the bit rate. Choosing it directly affects the size and auditory experience of its MP3 file. The greater the compression ratio, the greater the distortion, and the lower the compression ratio, the minor is distortion, but how can we find a us? What is the balance that is acceptable for both parties? This requires careful exploration in the experiment. Taking into account that the sound quality of the files with a low bit rate is not suitable for playing music, the minimum assembly is 128 kbps, and four fixed bit rate of 128, 192, 256 and 320 are used For comparison and test.

The compression ratio of 128 kbps remains relatively approximate, and the high frequency part is very distorted after compression. It sounds hollow, wrinkled, rough and, often, blinking. Mally understood, the compressed volume of a musical piece at 3 minutes 39 is 3414 kb. Although the volume is not great, the sound is not pleasant and there is a great flaw.

The compression effect of the Bits rate of 192 Kbps is much better than that of 128. First, the sound is solid, at least there is no vacuum sensation, high frequency distortion is also much lower, sound is compact, the noise is small and clean, which is ideal for contrast. The listening effect is only because the compression is still relatively strong, the performance of the details is not very good, the texture of musical instruments, especially the Wind instruments, it is still very hard. , unreal and lacks musicality. The compressed size is 5123 KB, I think this compression ratio is better to use in an MP3 player with a capacity of 128 ~ 256 m, which can not only meet the main sense of hearing, but is also suitable for size 128m You can store about 95 minutes of music, and 256m can duplicate 190 minutes of music.

The relationship between frequency, bit rate, bit rate and MP3 sound quality Part 2

Finally, if you want sound quality completely without loss, you should still use audio files in a lossless compression format or an uncompressed file format.

How good is the sound quality in mp3 format? 128/192/256/320, etc. What is the difference between the sound quality MP3 of various compression relationships / compression modes? What are some basic principles? How about the sound quality of other formats such as Ape / WMA / etc?

Speaking of MP3, I think I’m afraid that nobody will say that he has never heard about him. Even if you are not an User MP3, advertisements, advertising activities, discussions between friends and online resources, always give a small impression, right? For fashionable young people, especially friends who like music and friends who like digital devices, MP3 is probably a word from which you should talk every day, but what exactly mp3 , How to determine the sound quality of MP3 and how does it work? Is it good or bad? How can I hear high quality MP3? ? ? I think the following article can help you solve many doubts.

Through today’s MP3 users, the standard generally accepted for production is EAC capture + compression LAME. I also use this combination. Friends who have experience in this production process will discover some tricks for different music uses different configurations of parameters and compression ratios. ranging from 128 Kbps standard up to 320 Kbps maximum, but what is the effect and difference between these bit rates? ? How is the most appropriate compression ratio, what should be better for CBR and VBR, etc. These issues are often discussed by all. To clarify these details, I did a useful experiment and share it with you below. You will have some feelings.

Usually, I really like to listen to classical music, so I chose the first track of Bach’s “Grandenburg Concert” for this test. The version number of the FOOB2000 V0.8 playback software and the listening headphones are ER6 of Intech and E3C from Shure. . Because the classic repertoire has many details and the band is great, the requirements for all aspects of sound quality are relatively high, so it may clearly reflect the difference of details between the different processing methods.

The relationship between MP3 frequency, bit rate, bit rate and sound quality

I want to know the relationship between MP3 frequency, bitrate, bitrate and sound quality.

The higher the frequency and bit rate, the better the sound quality. It seems that most MP3 frequencies are 44100HZ. The bit rate is 128, 192, and so on.

The frequency mentioned here is the sampling rate, which is usually 44100 KHz, because this is the standard for music CDs.

Each song is ripped from a CD, converted to a WAV file, and then converted to MP3 using software like Lame. So it should be a sample rate of 44100 KHz. Unless yours isn’t a song, it’s recorded as a WAV file and you’ve selected other sample rates when recording.

The main factor that affects the sound quality of MP3 is the bit rate. The best today are 320K CBR (fixed bit rate) and VBR (variable bit rate), VBR files are a bit smaller than CBR. 192K VBR is the most popular on the Internet, which can meet the requirements of sound quality and file size at the same time, but I usually use CD to rip tracks or download APE (lossless compression, can be restored to WAV file) and then convert it to 320K VBR.

One last reminder: MP3 transcoding is distorted and the distortion cannot be reversed. In other words, if you convert MP3 to WAV sound quality, the file size increases dozen times, but the sound quality remains the same as MP3 sound quality.

If you want to hear low distortion, it’s better to listen to a CD or download APE.

First of all, sound quality is a very subjective thing!

It is often said that the sound quality is good, one refers to the good degree of reproduction, that is, the smaller the difference with the recording, the better; As for mp3, mp3 is a compressed format, the higher the bitrate, the less compression and less loss of detail, that is, the higher the bitrate, the closer to the original sound. But sound quality is also related to your output device. For example, a good mp3 player and a good pair of headphones will help your listening quality.

So if you want to improve sound quality, it’s best to start from the above perspectives and not overemphasize any one of them. When you have higher requirements for sound quality, you can give up mp3 and directly switch to stop CD. The CD carries wave files, which are completely lossless sound quality formats, which will perform better.

Assuming the distortion is small, the only way is to increase the bitrate. It’s best to use variable bit rate (VBR) compression to produce mp3 files, which can strike a balance between maximum fidelity and minimum file size.