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Signal processing is all about taking a signal, applying some changes to it and then getting a newsignal out. The change might be amplification or filtration or something else, but nearly all electronic circuits can be considered as signal processors. Thus, the signal processor might be composed of discrete components like capacitors and resistors, or it could be a complex integrated circuits, or it could be a digital system which accepts a signal on its input and outputs the changed signal. Digital signal processing (DSP) is the processing of signals by digital means. The term “digital” comes from “digit,” meaning a number and so “digital” literally means numerical. A signal carries a stream of information representing anything from stock prices to data from a remote sensing satellite. If they are represented in the form of stream of numbers, they are called digital signals. The processing of a digital signal is done by digital signal processor (DSP) by performing numerical calculations.Digital signal processors require several things to work properly. The processor should be fast enough with enough precision to support the required mathematics it needs to implement. It requires memory to store programming, samples, intermediate results and final results. It also requires A/D and D/A converters to bring real signals into and out of the digital domain. Further, it requires programming to do the job. The main applications of DSP are audio signal processing, audio compression, digital image processing, video compression, speech processing, speech recognition, digital communications, radar, sonar, seismology and biomedicine. Specific examples include speech compression and transmission in digital mobile phones, room matching equalization of sound, analysis and control of industrial process, seismic data processing, medical imaging such as CAT scans and MRI, MP3 compression, image manipulation, computer-generated animations in movies, high fidelity loud speaker crossovers and equalization, audio effects, etc. Digital signal processing is often implemented using specialized microprocessors such as the DSP56000, the TMS320 or the SHARC. Multi-core implementations of DSPs have started to emerge from companies including Free scale and stream processors.