3.1.6 describe digital signal processor

§Digital signal processing (DSP) is the use of digital processing, such as by computers or more specialized digital signal processors, to perform a wide variety of signal processing operations.

§Digital signal processing and analog signal processing are subfields of signal processing. DSP applications include audio and speech processing, sonar, radar and other sensor array processing, spectral density estimation, statistical signal processing, digital image processing, signal processing for telecommunications, control systems, biomedical engineering, seismology, among others.

§DSP can involve linear or nonlinear operations. Nonlinear signal processing is closely related to nonlinear system identification and can be implemented in the time, frequency, and spatio-temporal domains.

§The application of digital computation to signal processing allows for many advantages over analog processing in many applications, such as error detection and correction in transmission as well as data compression. DSP is applicable to both streaming data and static (stored) data.

Digital Signal Processor

§The goal of DSP is usually to measure, filter or compress continuous real-world analog signals.

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§Most general-purpose microprocessors can also execute digital signal processing algorithms successfully, but may not be able to keep up with such processing continuously in real-time.

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§Dedicated DSPs usually have better power efficiency, thus they are more suitable in portable devices such as mobile phones because of power consumption constraints.

§DSPs often use special memory architectures that are able to fetch multiple data or instructions at the same time.

Digital Signal Processor components

§Program Memory: Stores the programs the DSP will use to process data

§Data Memory: Stores the information to be processed

§Computer Engine: Performs the math processing, accessing the program from the Program Memory and the data from the Data Memory

§Input/Output: Serves a range of functions to connect to the outside world