Digital Signal Processor (DSP)

digital signal processor (DSP) is a door as involving many subjects and widely applied in many areas of emerging disciplines. Since the 1960s, along with the computer and the rapid development of information technology, digital signal processing technology arises at the historic moment and get rapid development. Digital signal processing is a through the use of mathematical skills executive conversion or extract information, to deal with the reality of the method, these signals signal by digital sequence said. In the past twenty years, digital signal processing has been in communications and other fields get extremely extensive application. Texas instruments, Freescale semiconductor manufacturers such as in this field has strong strength.

DSP (digital signal processor) is a unique microprocessor in digital signal processing, a lot of information to the device. Its working principle is to receive analog signals, converted to 0 or 1 digital signal. Again to digital signal modify or delete, strengthening, and in other systems of digital data interpreting the chip to simulate data or the actual environment format. It is not only a programmable sex, and actually on speed can reach hundreds of innumerable complex instruction program per second, far more than general microprocessors, digital electronic world is increasingly important computer chips. Its powerful data processing ability and high speed, is the most admirable two characteristics.

DSP microprocessor (chip) generally has the following main features:

(1) in an instruction cycle can complete a multiplication and a addition;

(2) programs and data space apart, can also access instructions and data;

(3) tablet with quickly RAM, usually within by independent data bus in two same access;

(4) has low overhead or without spending circulation and jump hardware support;

(5) fast interrupt handling and hardware I/O support;

(6) in single cycle with multiple operation; hardware address generator

(7) can be executed in parallel multiple operating;

(8) support, pipelining, decode and execute take refers to operate the can overlap execution.

Of course, compared with common microprocessors, DSP microprocessor (chip) other relatively weak some universal functions.

DSP advantages:

The tolerance of component values by not sensitive to temperature, environment and other external participate in effect is small;

Easy to implement integration; DFM

Can timeshare multiplexing, sharing processors;

To adjust the processor's coefficient realize adaptive filter;

Can simulate the processing can't function of the realization of the linear phase, multi-rate sampling, rate of cascade, easy handling, storage, etc.;

Can be used for frequency very low signal.

DSP weakness:

Need frequency-field;

The restrictions by sampling frequency, processing frequency range is limited;

Digital system consists of active components electricity, not passive equipment and reliable.

But its advantages than shortcomings.