Digital signal processing for short: DSP
Let's consider the most common function in the digital field: filtering. In short, filtering is the processing of the signal to improve its characteristics. For example, filtering can remove noise or static interference from the signal to improve its signal to noise ratio. Why do you use a microprocessor, not a simulator, to filter the signal? Let's look at its superiority:
The performance of analog filters (or more generally, analog circuits) depends on temperature and other environmental factors. The digital filter is largely unaffected by the environment.
Digital filtering is easy to copy in very small tolerance, because its performance does not depend on the combination of devices that have deviated from the normal value.
Once an analog filter is produced, its characteristics, such as the band frequency range, are not easy to change. The use of a microprocessor to implement a digital filter can be reprogrammed to change the characteristics of the filter.