Example: 16bit, 16K, 115200
1. Number of sampling bits:
That is, the sample value or sample value (that is, the sample amplitude is quantized ). It is a parameter used to measure the fluctuation of sound, and it can also be said to be the resolution of the sound card. The larger its value, the higher the resolution and the stronger the ability of the sound produced.
The number of sampling bits in the computer is generally divided into 8 bits and 16 bits, but please pay attention to one thing, 8 bits does not mean dividing the vertical coordinate into 8 parts, but dividing it into 2 to the 8th power or 256 parts;
Quantization signal-to-noise ratio: SNR=6.02n+1.76; specific calculation process reference: Quantization noise-Know
Taking 16bit sampling digits as an example, the calculation formula of dBFS (Full Scale):
That is, the dynamic range of 16bit sampling bits is
2. Sampling frequency
That is, the sampling frequency refers to the number of times a sound sample is obtained per second . The higher the sampling frequency, the better the sound quality and the more realistic the sound restoration, but at the same time it takes up more resources. Due to the limited resolution of the human ear, frequencies that are too high cannot be distinguished. There are 22KHz, 44KHz and other levels in the 16-bit sound card. Among them, 22KHz is equivalent to the sound quality of ordinary FM radio, and 44KHz is equivalent to the sound quality of CD. The current commonly used sampling frequency does not exceed 48KHz.
3. Baud rate
Baud is the modulation rate, which refers to the rate at which the effective data signal modulates the carrier, that is, the number of times the carrier modulation state changes per unit time. can be understood as the information transfer rate