Tag: bitrate or bit rate

Audio Bitrate Calculation

Generally, the files we read will know the following parameters:

Sampling frequency: the number of sampling points that pass one second; by
For example, the most common sample rate of 44.1k means that there are 44,100 sampled data points in one second;

Bit depth: Bit depth is also called sampling bit depth, and the bit depth of the audio determines the dynamic range.
Our common 16-bit (16-bit) can record a dynamic range of about 96 decibels. Well, roughly you can know that each bit can record about 6 decibels of sound. Similarly, the 20-bit recordable dynamic range is about 120 dB; 24 bits is about 144 dB.

If we define 0dB as the maximum value, then the amplitude of the sound is calculated by extending down, then the dynamic range of CD audio is “-96dB ~ 0dB”. And so on, the dynamic range of 24-bit HD-Audio is “-144dB~0dB”. It can be seen that at higher bit depths, a greater dynamic range is available and lower levels of detail can be recorded.

Number of channels: usually single channel or two channels

Through the above parameters, the bit rate of the audio can be calculated

\color{blue}{code rate = sample rate (44.1k) * bit depth (16) * number of channels (2) = 1411.2kbps}

Audio bitrate, also known as bitrate: Refers to the amount of data that can pass through an audio stream per second. For example, 128 kbps, where ps (per second) is per second and kb is thousand bits, then 128 kbps means that the amount of data that can be transmitted in one second is 128 thousand bits. For files of the same format, the higher the bitrate, the better the sound quality. But for audio files of different formats, the same bitrate does not mean the same sound quality.

CD quality sound, usually two channels, compressed at 128kbps MP3, one second of data is converted to 128kbits. Some details are lost, which saves a lot of disk space or bandwidth.

After knowing the audio code rate, you can get the size of the whole audio file = duration (300s) * code rate (1411.2)/1024/8=51.67M

3 Ways to Change Bitrate of MP3 Files Part 2

The second thing you want to read is that you should never convert to a lower bitrate. bitrate to a higher bitrate stream and I hope it sounds better. You cannot gain quality by increasing the bit rate. This is absolutely correct. If you try to convert the bitrate, you will actually lower the quality of the MP3 file.

If you want an MP3 with a higher bitrate than it currently has, you’ll need to go back to the source (CD, etc.) and extract the audio at full quality. You can then convert that file to a higher bitrate MP3 file.

The last thing you need to know is that converting between lossy formats is not recommended as you will still lose quality. However, it is possible to convert between formats losslessly while preserving quality.

On the other hand, many tests done even with recording engineers or professional musicians have shown that less than 1% of the population can distinguish between an mp3 with good bitrate (196 for example) and a samplerate of 44100 or more.

There is a sector of puritanism that defends tooth and nail the use of losless formats, because in theory they seem to be better, but the limitations and peculiarities of human hatred mean that a loosy file with a high bitrate and a high samplerate is enough for the human ear.

Mp4Gain is the most professional and polished program to help you in all these matters and you can achieve the highest sound quality with any format.

3 Ways to Change the Bitrate of MP3 Files

Do you want to change the bitrate of an MP3 file?

This can be useful if, for example, you need to reduce the size of an MP3 file. A 320kbps MP3 file, the highest bit rate allowed for MP3 files, can be reduced to 192kbps to significantly reduce the size of the MP3 file.

There is a drop in quality, but the difference is negligible for most listeners using standard speakers or headphones. If you’re an audiophile, you’ll probably never use the MP3 format, except for expensive audio equipment.

You are most likely using a lossless format such as PCM, WAV, AIFF, FLAC, ALAC, or APE audio, compressed or uncompressed. Uncompressed PCM audio files are about 10 times larger than CD-quality MP3 files.

The MP3 format is a lossy format, which means sacrificing audio quality to keep the file size relatively small. Almost every site will tell you not to convert lossless audio files to MP3 unless you might lose some audio quality.

<Almost all the time. The only time it might make sense is if you have a high bitrate audio file in a low quality format like WAV. For example, it might make sense to convert a 96kbps WAV file to MP3, but only if you choose a bitrate of 192kbps or higher. A higher bitrate in an MP3 file will allow it to maintain the same quality as a WAV file, even if it has a lower bitrate.

Audio Bitrate: What is the Bitrate of Music Part 3

How should 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 500kbps means that audio data and video encoded 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 192Kbp/s, the sound quality of 192Kbp/s is better than that of 128Kbp/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.

Audio Bitrate: What is the Bitrate of Music Part 2

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 transmission 56 KBPS = voice 64 KBPS = voice boost (best bit rate for mobile phone ringtones) Setting value, the best mobile phone mono MP3 player setting value) 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 MP3 players mid- to high-end) 192KBPS=CD (best setting for high-end MP3 players) 256KBPS=Studio Music Studio (for music enthusiasts) The sample rate is when the analog signal is ca is converted to a digital signal The sampling rate is related to the quality of the sound. 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 sampling rate is similar to the sound quality of AM radio 2.22,050Hz The sound of this sampling rate is similar to the sound quality of FM radio, but less than 3.32 000 Hz This sample The sound of this frequency is higher than the sound quality of FM broadcast 4.44 100 Hz The sound of this sampling frequency reaches the sound quality of the CD audio 5.48000 Hz Sound at this sampling rate reaches DAT audio sound quality 6.96000 Hz Sound at this sampling rate reaches DAT audio sound quality The higher the sampling rate sound quality of the DVD audio, the more disk space the final sound file will take up. Usually we can choose 44.1KHZ sampling rate.