Digital signal processing, known as dsp, is an emerging discipline with many disciplines and a wide range of applications. Since the 1960s, with the rapid growth of computers and information technologyDigital signal processing technologyThey have emerged and developed rapidly. Digital signal processing is a method of processing real signals by using mathematical techniques to convert or extract information, which are expressed in digital sequences. In the past two decades or more, digital signal processing has been used very widely in areas such as communications。
Dsp principles and characteristics
Digital signal processing is the theory and technology for digital expression and processing of signals. Digital signal processing and analogue signal processing are subsets of signal processing. The dps principle is to use computers or specialized processing devices to digitally capture, transform, filter, value, enhance, compress, identify, etc. Signals in order to obtain signals that meet people's needs。
The purpose of digital signal processing is to measure or filter continuously simulated signals from the real world. It is therefore necessary to convert a signal from a analog field to a digital domain before a digital signal is processed, which is usually done through a mode converter. The output of the digital signal processing is often also converted to the analogue domain, which is achieved through the digital converter。
An algorithm for digital signal processing requires the use of computers or specialized processing equipment such as digital signal processors (dsps) and specialized integrated circuits (asics). Digital signal processing technologies and equipment have outstanding advantages, such as flexibility, resistance to interference, small size of equipment, low construction cost and speed, which cannot be compared with analogue signal processing techniques and equipment。
Digital signal processing is achieved in a number of ways, for example by using software (e. G. Fortran, c language) on a general computer; by adding a dedicated accelerator in a general computer system; and by using a generic single-piece machine, which can be used for some less complex digital signal processing such as digital control
This is done with a generic programmable dsp chip. Dsp chips have software and hardware resources that are more suitable for digital signal processing than single-piece machines and can be used for complex digital signal processing algorithms
This is done with dedicated dsp chips, which in some special cases are extremely fast for signal processing and are difficult to achieve with generic dsp chips, such as dsp chips dedicated to algorithms such as fft, digital filtering, volume etc., which use the corresponding signal processing algorithm as hardware inside the chip without software programming。
The dsp generally uses the harvard structure of the data bus and program bus separation, allowing for full overlap of commands and enforcement orders; it allows for direct transmission of information between processes and data spaces and reduces access conflicts, thereby acquiring high-speed computing capabilities。
Most of the water-flowing techniques are used, i. E. Each instruction is completed by a series of functional units, each of which takes the pointer, code, number, execution, etc., thereby reducing the time of implementation of each instruction without increasing the frequency of the clock. Dsp usually has a flow line of more than three levels。
More than one operation per clock cycle. Dsps are mostly equipped with stand-alone multiplications and adhesors for characteristics such as filtering, correlation, matrix operation, etc., which allow for multiplications and two cumulative operations over the same cycle. Some of the dsps allow multiplication, plus and minus, which greatly accelerates the fft's albatross。
Dsp application area
(1) generic digital signal processing: digital filtering, volume, associated, fft, self-adapted filtering, wave-form occurrence, etc。
(2) in the area of communications: high-speed modems, code compilers/ciphers, faxes, process switches, satellite communications, ip telephones, etc。
(3) speech processing: voice recognition, synthesis, vector code, voicemail, etc。
Typical dsp system
Systems consisting of dsp devices include voltage adjusters, duplicate circuits, crystal oscillators, and program and data repositories (generally using internal resources of dsp devices)
Typical dsp system
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©2023 wiku electronic market network() filing number: zheb2-20050339-1 operating licence: zheb2-202010386 copyright declaration
Buyer service line: 0571-85317607
Seller service line: 0571-85317607
