Audio bit rate

bit rate

In telecommunications and computing, bit rate (sometimes written bitrate) is the number of bits that are conveyed or processed per unit of time.

audio bit rate

CD-DA, the standard audio CD, is said to have a data rate of 44.1 kHz/16, meaning that the audio data was sampled 44,100 times per second and with a bit depth of 16. CD-DA is also stereo, using a left and right channel, so the amount of audio data per second is double that of mono, where only a single channel is used.
The bit rate of PCM audio data can be calculated with the following formula:

For example, the bit rate of a CD-DA recording (44.1 kHz sampling rate, 16 bits per sample and 2 channels) can be calculated as follows:

The cumulative size of a length of PCM audio data (excluding a file header or other metadata) can be calculated using the following formula:

The cumulative size in bytes can be found by dividing the file size in bits by the number of bits in a byte, which is 8:

Therefore, 80 minutes (4,800 seconds) of CD-DA data requires 846,720,000 bytes of storage:

摄像机采样率32000的情况下 位深16bit 双声道的话 也才128KB

Perferences
https://en.wikipedia.org/wiki/Bit_rate