What is the proper audio bitrate?
Bit rate refers to the number of bits (bits) transmitted per second.
The unit is bps (Bit per second) The higher the bit rate, the faster the data transmission speed.
Bitrate in sound refers to the amount of binary data per unit of time after converting an analog sound signal to a digital sound signal, which is an indirect measure of audio quality.
Bitrate 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. As a benchmark for the efficiency of digital music compression, bit rate indicates the rate of the number of bits bps (bit per second, bits per second) transmitted per unit of time (1 second). The unit is usually kbps (1000 bits per second in colloquial terms). The bit rate of digital music on CD is 1411.2 kbps (that is, to burn 1 second of CD music, 1411.2 × 1024 data bits are required), the high BIT RATE of the digital music file music means that it should be processed in a unit of time (1 second) The amount of data (BIT) is large, which means that the sound quality of the music file is good. However, when the BITRATE is high, the file size increases, which will take up a lot of memory capacity. The most commonly used bitrate for music files is 128 kbps, and MP3 files can generally use 8 to 320 kbps. In the same way, most of them are 32-256 Kbps. Of course, the wider the rate, the better, but 320 Kbps is the highest level at the moment.
Bitrate calculation formula
The basic algorithm is: [Bit rate] (kbps)=[file size] (bytes) X8/[time] (seconds)/1000
Special algorithm for audio files: [bit rate] (kbps) = [quantization sample point] (kHz) × [bit depth] (bit/sampling point) × [number of channels] (typically 2)
For example, the D5 drive has a capacity of 4.3G, which takes into account different audio formats, so it is calculated as 600M (so the remaining capacity is 4.3*1000-600=3700M), so the video file should not be larger than 3.7G, in this example, take the capacity of the video file is 3.446G, and the length of the video is 100 minutes (6000 seconds). The calculation result: the bit rate is approximately equal to 4933kbps.
Various code rate principles
1. Bitrate is proportional to quality, but file size is also proportional to bitrate.
2. If the bitrate exceeds a certain value, it has little effect on the image quality.
3. DVD capacity is limited, whether it is 4.3G standard, overdubbed or D9, there are limits.
