Digital signal processing (DSP) refers to anything that can be done to asignal using code on a computer or DSP chip. To reduce certainsinusoidal frequency components in a signal in amplitude, digital filteringis done. One may want to obtain the integral of a signal. If the signalcomes from a tachometer, the integral gives the position. If the signal isnoisy, then filtering the signal to reduce the amplitudes of the noisefrequencies improves signal quality. For example, noise may occur fromwind or rain at an outdoor music presentation. F iltering out sinusoidalcomponents of the signal that occur at frequencies that cannot beproduced by the music itself results in recording the music with little windand rain noise. Sometimes the signal is corrupted not by noise, but byother signal frequencies that are of no present interest. If the signal is anelectronic measurement of a brain wave obtained by using probes appliedexternally to the head, other electronic signals are picked up by theprobes, but the physician may be interested only in signals occurring at aparticular frequency. By using digital filtering, the signals of interest onlycan be presented to the physician.1.2 Historical Perspective
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