When the audio signal output with constant voltage is connected to the system, the sound pressure generated by the speaker increases or attenuates with the change of frequency, and the phase changes with frequency. This sound pressure and The relationship between phase and frequency is called frequency response.

The ideal frequency response curve should be exactly the same as the input signal. An equal loudness signal (the sound pressure of each frequency band is the same) will be used as the input signal, so the ideal frequency response curve should be as close as possible. Straight and smooth curves.

For sound cards, the sampling specifications have two parameters, one is the sampling frequency, and the other is the sampling accuracy. The sampling frequency indicates how many times the parameters are taken from the received signal in one second, and the unit is Hz. ;

The sampling accuracy indicates the precision of each sampling, in bits. There are many different sampling methods at present, and the sampling quality is determined by these two basic parameters.

Extended information:

In control theory, the stability and other motion characteristics of the system can be easily analyzed based on the frequency response. The concept of frequency response is also important in system design.

Introducing an appropriate form of correction device (see control system correction method) can adjust the characteristics of the frequency response and improve the performance of the system. The analysis and design method based on frequency response is called frequency response method. It is one of the basic methods of classical control theory.

In control engineering, it is also called frequency characteristic. It is the steady-state response characteristic of the system to sinusoidal signals of different frequencies.

Baidu Encyclopedia - Frequency Response