DSP (Digital Signal Processor) is a unique microprocessor, which uses digital signals to process a large amount of information. Its working principle is to receive analog signals, convert them into digital signals of 0 or 1, and then modify, delete and enhance the digital signals, and translate the digital data back to analog data or actual environment format in other system chips. Not only is it programmable, but its real-time running speed can reach tens of millions of complex instruction programs per second, which exceeds that of general microprocessors. It is an increasingly important computer chip in the digital electronic world. Its powerful data processing ability and high running speed are the two most commendable features.

DSP is the abbreviation of Digital Signal Processing (theory and method of digital signal processing) or Digital Signal Processor (programmable microprocessor for digital signal processing). When we talk about DSP technology, it generally refers to the method and technology of using general or special DSP processors to complete digital signal processing.

DSP has the following characteristics:

DSP processor adopts Harvard structure and improved Harvard structure.

Harvard structure is to separate the storage space of program code and data, and each has its own address and data bus. The reason why Harvard structure is adopted is to process instructions and data in parallel, which can greatly improve the operation speed. In order to further improve the efficiency of signal processing, it is improved on the basis of Harvard structure. So that data can be transmitted between program code and data storage space, which is the so-called improved Harvard structure.

Adopt flowing water technology.

Pipeline technology is to overlap the steps of each instruction for execution. Harvard structure adopted by DSP processor separates the address of program storage space and data storage space from data bus, which provides great convenience for pipeline technology.

In order to improve the operation speed of DSP processor, hardware multipliers and MAC (multiply and add) instructions are set up.

The DSP processor has a completely independent bus and controller for DMA, which is quite different from the general CPU. Its purpose is to transmit data without affecting the work of the CPU and its related buses.

In the DSP processor, a special data address generator is set up to generate the required data address. The generation of data address is parallel to the work of CPU, which saves CPU time and improves the signal processing speed.

The DSP processor works in harmony with the external environment according to its own needs. Often have a wealth of peripherals. Such as a clock generator. Timer, etc.

Fixed-point DSP processor and floating-point DSP processor. The overflow problem is often considered in fixed-point DSP, but it can be ignored in floating-point DSP. Compared with fixed-point DSP processors, floating-point DSP processors are faster, especially for floating-point operations. In real-time situation. Floating-point DSP processors are often considered. Floating-point DSP processors are more expensive and harder to develop.

The use of DSP

2000 is mainly used for control: power supply, optical network, etc. 5000 is communication and still image processing: video products, digital radios, etc. And 6000 is digital communication and image processing: mobile communication, printer, digital scanner, etc.