There are many ways for digital filters to realize signal processing. We introduce the two most used in practice. One is our integrated circuit method that combines various components of an integrated circuit into a dedicated device. This device is called It is a digital signal processor, and the digital processor similar to the arm architecture or the single chip architecture is one of the commonly used ones. This method has high commercial value for the demand for complete sets of batches, because the cost of construction is relatively low, and it is welcomed by the market; The other is to use the x86/x64 commercial or industrial computer that we usually use for simulation. This is completely simulated using application software. This method is also used in laboratories or large-scale digital filtering projects. This method The cost is high, and it is not suitable for mass production and matching. However, it is the best way to simulate in the laboratory, and it has great advantages in high-level simulation and calculation.