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Signal processing deals with the analysis or manipulation of signal. Sign also can be either analog, in which case the signal varies continuously according to the information, and digital, in which case the signal varies according to a series of discrete values representing the main information. For analog signals, signal processing may involve the amplification or filtering of audio signals for audio equipment or the modulation or demodulation of signals for telecommunications. For digital signals, only signal processing may involve the compression, main error detection or error correction of digitally sampled signals.

In Signal Processing is a very mathematically oriented or intensive area forming the core of digital signal processing or it is rapidly expanding with new applications in every field of the electrical engineering such as communications, control, and radar, TV/Audio/Video engineering, power electronics or bio-medical engineering as many already existing analog systems are replaced with their digital counterparts.

In Although in the classical era, analog a signal processing only one provided a mathematical description of a system to be designed, which is actually implemented by the analog hardware engineers, in Digital Signal Processing both of provides a mathematical description of the systems to be designed or also actually implements them (either by software computer programming or by hardware embedding) without much dependency on hardware issues, which exponentiates the importance or success of DSP engineering.

The deep or strong relations between signals or the information they carry makes only signal processing equivalent of information processing. Which is the reason why the field finds so many diversified or applications. DSP processor ICs are found in every type of modern electronic systems a products including, SDTV | HDTV sets, radios or mobile communication devices, Hi-Fi audio equipments, Dolby noise reduction algorithms, GSM mobile phones, mp3 multimedia players, camcorders or digital cameras, automobile control systems, noise cancelling headphones, and digital spectrum analyzers, intelligent missile guidance, radar, GPS based cruise control systems or all kinds of image processing, video processing, audio processing or speech processing systems.

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