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What does MP3 bitrate mean?

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What does MP3 bitrate mean?

Bit rate

The rate at which a digital channel transmits digital signals is called the data transfer rate or bit rate.
The word bitrate has many translations, such as bitrate, etc., which indicates how many bits per second the encoded (compressed) audio data should be represented, and a bit is the smallest binary unit, either 0 or 0. 1. The relationship between bitrate and audio and video compression is simply that the higher the bitrate, the better the quality of the audio and video, but the larger the encoded file; if the bitrate is lower, the situation is reversed.

For example: encode audio and video at 500 Kbps.
where bps are bits 1K = 1010 = 1024
b is little
s is the second
p is for (for)
Therefore, encoding at 500 kbps means that the encoded audio and video data must be represented at 500 K bits per second.
In the baseband transmission system, the bit rate is used to represent the code rate of transmitted information.
The bit rate Rb refers to the unit of time
The number of binary bits transmitted within the unit, the unit is b/s. For example, the transmission speed 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, ternary and ternary
The information transmission rate of the multivariate digital code stream in the

In M-ary modulation, the relationship between the bit rate Rb and the baud rate Rs is:
Rb=Rslog2M
The sampling rate refers to the ratio of the sampling samples to the total number of samples, and the sampling rate refers to the number of samples per unit of time. If it is an instrument, the sampling rate is 40MSa/s, which indicates that the number of samples per second is 40M, but it cannot be represented by 40MHz.

The process of converting analog audio to digital audio is called sampling. In a nutshell, how much data is needed to record a 1 second duration of sound via waveform sampling. A sound with a sample rate of 44 KHz requires 44,000 data points to describe a 1-second sound waveform. In principle, the higher the sample rate, the better the sound quality.

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What is bit rate? Knowledge of the MP3 audio format. Part 2

Bitrate is a benchmark indicator of the efficiency of digital music compression.

The bit rate represents the number of bits bps (bit per second, bits per second) transmitted per unit of time (1 second). We usually use kbps (in simple terms, it is per second) clock 1000 bits) as the unit. The bit rate of digital music on CD is 1411.2 kbps (ie recording 1 second of CD music requires 1411.2 × 1024 bits of data). The higher the bit rate of the music file, the more data (Bit) must be processed in a unit of time (1 second), and the better the sound quality of the music file. However, when the bit rate is high, the file size increases, which will occupy a large amount of storage capacity. 8 to 320 kbps.

1. WMA (Windows Media Audio, Windows Media Audio)

As a Microsoft media compression method, it is a part of the technology that compresses only audio data in Windows Media Technologies. The sound quality is similar to MP3 and can be compressed with half the technology of MP3. It has the copyrighted Windows Media Rights Manager, which can be played by installing in WMP (Windows Media Player, Windows Media Player). Due to the strong influence of Microsoft and Windows, as well as major copyright reasons, the major American record companies EMI and BMG have officially confirmed that they use the WMA method developed and produced by Microsoft. It is believed that this advanced method will become even more popular in the future.

2. MP3 (CBR, VBR, ABR)

MP3 is currently the most widely used and widely used lossy compressed digital audio format, which has been explained above and will not be repeated here.

CBR (constant bit rate)

CBR is the oldest and simplest MP3 encoding (compression) method. When this method is used for encoding, the bit rate of the entire file is the same, in other words, the bit rate used by the MP3 file per second is the same. Although the music file has sections of varying complexity, the encoder always keeps the bit rate constant, unless you use the highest sound quality, otherwise the sound quality of the different sections of the MP3 file will vary. The more complex the passage, the worse the sound quality. Its biggest advantage is that the file size is fixed, which is convenient for calculating storage space.

What is bit rate? Knowledge of the MP3 audio format.

Digital audio formats are audio signals that are recorded, processed, and reproduced in digital form.

The emergence of digital audio formats is to meet the needs of high-fidelity playback, storage and transmission. Simply put, early analog audio formats had issues with playback distortion and glitches due to media wear. Since the advent of CD discs, audio files in digital format have become popular, but another problem has arisen: the limitation of storage volume and the phenomenon of CD disc wear is still present. Saving to a hard drive (in connection with longer storage time) is also not a good solution when storage media (mainly hard drives) are still expensive at the time. The rise of the Internet has created a requirement for long-distance file transmission. Under the restriction of bandwidth, the demand to reduce file size has become more intense. All this has led to the generation of lossy compressed digital audio formats from external factors!

In terms of internal factors, with the improvement of computing and coding capabilities, the progress of various acoustic psychological models has promoted the emergence of various lossy compressed digital audio formats. Some of the most commonly used audio formats in MP3 players are briefly introduced below: MP3 (CBR, VBR, ABR), WMA, WAV, ADPCM, and the emerging audio formats AAC, ASF, and OGG.

Before introducing various digital audio formats, let’s clarify one concept: bitrate.

In the field of computing, all information is digitized. Bit is the smallest unit of data in a computer, it refers to a number of 0 or 1, which is a mathematical binary number, a “0” or “1” , is a bit. For example, when we say a 2-digit number, it means that it is a two-digit binary number, and there are 4 combinations of “00”, “01”, “10” and “11”, which represent 0, “11” in decimal respectively. 1, 2 and 3 are four numbers.

The higher the kbps value of the mp3 file, the better the sound quality? Part 2

MPEG audio encoding has a high compression ratio, MP1 and MP2 have a compression ratio of 4:1 and 6:1-8:1 respectively, while MP3 has a compression ratio of up to 10:1-12: 1, which means that one minute Uncompressed CD-quality music requires 10 MB of storage space, but only about 1 MB after MP3 compression encoding, and its sound quality is basically distortion-free.

Although it is a distorted compression, its biggest advantage is a higher compression ratio in exchange for very little sound distortion. Usually a CD can only store a dozen CDs, but it can store hundreds of MP3 songs, which is why MP3 is popular all over the world. Currently, MP3 is the most common music format on the Internet. Music files of the same length are stored in the MP3 format, usually only 1/10 of the WAV format. Due to their small file size and good sound quality, they can achieve a sound effect that is closer to the original sound source. Therefore, until now, the status of MP3 format as the mainstream audio format is still hard to shake. Simply put, WMA is smaller than MP3 and MP3 has better sound quality than WMA. Currently, the music format with the best sound quality is APE, which is equivalent to the sound quality of a CD, but relatively large. A song weighs about 20 MB! 1 or so, another advantage of WMA is that content providers can add copy protection through DRM (Digital Rights Management) solutions, such as Windows Media Rights Manager 7. This copyright protection technology built-in author can limit the playback time and number of playback, and even the playback machine, etc., which is a boon for music companies that have been defeated by piracy. MP3 format: MP3 technology originated From MPEG technology, MPEG is short for Moving Picture Experts Group. MPEG audio encoding has a high compression ratio, MP1 and MP2 have a compression ratio of 4:1 and 6:1-8:1 respectively, while MP3 has a compression ratio of up to 10:1-12: 1, which means that one minute Uncompressed CD-quality music requires 10 MB of storage space, but only about 1 MB after MP3 compression encoding, and its sound quality is basically distortion-free.

The higher the kbps value of the mp3 file, the better the sound quality?

Kbps refers to the number of bits (bit rate) of mp3, and bit rate refers to the amount of information that can be transmitted per second in a data stream.

Kbps means “kilobytes per second,” so a higher value means more data, a higher bit rate, more information, and better sound quality, but it also means more processing to decode the information. the more space the file should take up. (But this is nothing compared to today’s hardware, and many people put ape directly on the hard drive!) For mp3, 128kbps is a qualified quality! As for the bit rate you use, it depends on your own needs. If the requirements are high, use CBR320kbps, CBR192kbps or VBR variable bit rate. If the file size is required to be small for network streaming or online playback, please use CBR128kbps or lower bit rate can be. Sound quality is closely tied to its compression ratio. In fact, WMA is slightly worse than MP3 at a rate of 192 kb/s or higher, but it is quite close to the effect of the original WAVE file. The difference is that the treble component of WMA in the same ratio is greater than that. of MP3 in the ratio of 96K and 64K. Simply saying that WMA is more advanced than MP3 is untenable. In fact, their principles are the same, and they are similar in the case of high ratios. Also, there is a problem with the compression software: if you use Hero Jieba to compress high-quality MP3, it will definitely be worse than WMA. Now LAME has grown considerably and is stronger than WMA at ratios above 128K. Comparing 96K WMA with 128K MP3, MP3 is definitely better. So it depends on your needs, if you need low baud, MP3 PRO or WMA is recommended (MP3 PRO is much better than WMA at 64K ratio), and if it’s high quality MP3, it doesn’t matter, but it’s still recommended. MP3, because after all it is a fairly open format, unlike WMA, which is monopolized by the Microsoft family, and can only be played with WMP. For that, I only use MP3. WMA format: WMA sound quality is stronger than MP3 format, its “body” is thinner than MP3, and it supports data transmission technology (Stream), which can be downloaded and listened to on the Internet. The characteristic of WMA is that when a song is compressed to a very small size, it can still maintain good sound quality, which is much better than RA format. It is the same as the VQF format developed by YAMAHA in Japan. Reduces data stream but maintains sound quality method to achieve higher compression ratio than MP3. The compression ratio of WMA can generally reach around 18:1. Another advantage of WMA is that content providers can add copy protection through DRM (Digital Rights Management) solutions, such as Windows Media Rights Manager 7. This built-in copyright protection technology can limit the playing time and the number of plays, and even the playing machine, etc., which is a blessing for music companies that have been defeated by piracy .MP3 Format: MP3 technology originated from MPEG technology, MPEG is short for Moving Picture Experts Group. MPEG audio encoding has a high compression ratio, MP1 and MP2 have a compression ratio of 4:1 and 6:1-8:1 respectively, while MP3 has a compression ratio of up to 10:1-12: 1, which means that one minute Uncompressed CD-quality music requires 10 MB of storage space, but only about 1 MB after MP3 compression encoding, and its sound quality is basically distortion-free. Although it is a distorted compression, its biggest advantage is a higher compression ratio in exchange for very little sound distortion. Usually a CD can only store a dozen CDs, but it can store hundreds of MP3 songs, which is why MP3 is popular all over the world. Currently, MP3 is the most common music format on the Internet. Music files of the same length are stored in the MP3 format, usually only 1/10 of the WAV format. Due to their small file size and good sound quality, they can achieve a sound effect that is closer to the original sound source. Therefore, until now, the status of MP3 format as the mainstream audio format is still hard to shake. Simply put, WMA is smaller than MP3 and MP3 has better sound quality than WMA. Currently, the music format with the best

What is bit rate, bit rate and KBPS?

People often use Kbps to describe the hearing effect and audio quality.

On Windows systems and some players, kbps is called “bit rate” and “bit rate”.
16Kbps=phone sound quality
24Kbps=Increased telephone sound quality, short wave transmission, long wave transmission, European standard medium wave transmission
40Kbps=US standard medium wave transmission
56Kbps=Voice
64Kbps=Voice boost, mobile phone ringtones the best bit rate (Kbps) setting value, mobile phone The best setting for mono MP3 players is
112 Kbps = FM FM stereo transmission 128 Kbps =
best setup for cassettes, mobile phone stereo MP3 players, best setup for low-end MP3 players
192 Kbps = the best setting for mid-range MP3 players The fixed value of
320 Kbps = the best setting for high-end MP3 players (the highest bit rate on the
MP3 format) The highest quality of the MP3 format is 320 Kbps

2. How to distinguish true and false KBPS
The maximum quality in MP3 format, the bitrate is 320Kbps, but it is not ruled out that some unscrupulous merchants convert low quality audio (such as: 40, 64, 128 kbps) to the maximum quality (320kbps);
for a long time, many people Judgment on sound quality depends entirely on the bitrate of the dance music, i.e. whether the audio file is 192k, 256k or 320k (the bitrate in the file mp3-properties-detailed information), but in fact, this parameter does not really reflect a song. The sound quality of music is data that can be falsified and cannot fully represent the actual sound quality of a song. For example, using software such as QianqianjingTing, you can convert a 64Kbps music to 320Kbps, but before conversion and conversion After the sound quality is the same, the sound quality has not really improved.

What does kbps mean? Part 2

With the proliferation of digital storage and streaming, few people listen to music with physical objects.

Earlier I asked a high school student that he didn’t use the tape and that he didn’t know what it was. It was really shocking!

That’s the tape thank you!

Now almost all the music we listen to comes from the internet, be it Youtube or Soundcloud, Spotify or songs downloaded from iTunes or Beatport. Most of the time we don’t think that the sound transmitted by these different platforms is different, but there are times when we suddenly feel that the “sound quality” is not very good, but often we don’t know what the sound is. quality is What is the meaning?

Today we will introduce you to what this “sound quality” really means and the principle behind it.

First of all, everything we hear from the Internet are digital files, that is, the real (continuous) sound is saved by sampling (slicing) and then restored by decoding. So generally the quality of the sound we hear has two levels: one is how finely the song itself is sampled, and the other is how realistic our playback system is when playing it.

If you take a video as an example, you can see the fineness of 480p, 1080p, 4K video in the image below.

And this is similar to the finesse of the song itself: the finer the sample, the better the sound quality. But we actually see the image through the screen, so even though I have 4K HD video, I still see it on a traditional VCR. It may be the same as 480p, because your player can’t play it. Good quality. It’s like buying a CD and listening to it with the 39 yuan headphones Daiso bought.

But today we are more focused on the level of sophistication of the original song. The two most important elements that affect the sound quality of digital music are the sample rate (Hz) and the bit depth (bits), which are the horizontal and vertical axes in the figure below.

The so-called sample rate is the number of points we want to take in 1 second to sample (horizontal axis), and the bit depth is the density of the scale we want to set on the vertical axis.

The following image shows the difference between the sample rate of 100 Hz and 33 Hz, respectively. The black line is the original waveform.

Connect the sampled lines and compare them to the original waveform to learn the effect of the sample rate on the sound. 100 Hz is significantly closer to reality than 33 Hz.

At this time, someone will ask, so you can get 100 million Hz, and it is guaranteed to be the same as the real thing. Basically yes, but there will be a big problem with this, the file will be very big and it can take a year to upload a song. And the numbers are generated to speed up the transmission speed, so this is not acceptable!

To achieve a perfect balance, you need to set a suitable sample rate, which makes people sound good, but the file is not too big, and the bottom line is that it should be at least 44.1kHz. Because according to the sampling theory, the sampling frequency should be greater than twice the bandwidth of the sampled signal, and people can hear the sound up to 20,000 Hz, so we take a little more than 2 times as the standard minimum.

The object of comparison is that the general local dialect is 8000Hz. You can listen to the CD and compare the microphones.

Of course, there are 48,000 Hz and 96,000 Hz or even more, but 96,000 Hz is enough by industry standards.

The following is the common bit depth of 16 bits, 24 bits, which is the 16th power of 2 and the 24th power. What it affects is the part of the vertical axis that we just mentioned, as shown in the figure.

It can be seen that the dynamic range that 24-bit can record is larger than that of 16-bit, in other words, the sound you hear can be more vivid, in other words, it can accommodate a larger dynamic range.

What does kbps mean?

What does cbr320kbps mean?

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?

What does kbps mean?
Different compression encoding methods

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.

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, while common and conventional lossless compression formats today include APE, FLAC, TTA, TAK, WAV, Generally CDs are lossless music.

What does kbps mean?
different file sizes

Common MP3, WMA and other formats occupy about 1M-5M 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.

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). 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 or 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.

What does kbps mean?
different sound

The feature of lossless music is that regardless of whether there is sound between the beats, its data always flows smoothly, so the fast magnetic vibration in your headphones is stable, and the sound is natural and real; while lossy formats such as MP3 are due to the loss of people The ear can not hear part 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 magnet block vibrates excessively and unstable, which will produce burr noise. If professional equipment is used, it is easy to hear right and wrong.