Digital Signal Processing Filtering Approach

Description

Digital signal processing (DSP) refers to anything that can be done to a

signal using code on a computer or DSP chip. To reduce certain

sinusoidal frequency components in a signal in amplitude, digital filtering

is done. One may want to obtain the integral of a signal. If the signal

comes from a tachometer, the integral gives the position. If the signal is

noisy, then filtering the signal to reduce the amplitudes of the noise

frequencies improves signal quality. For example, noise may occur from

wind or rain at an outdoor music presentation. F iltering out sinusoidal

components of the signal that occur at frequencies that cannot be

produced by the music itself results in recording the music with little wind

and rain noise. Sometimes the signal is corrupted not by noise, but by

other signal frequencies that are of no present interest. If the signal is an

electronic measurement of a brain wave obtained by using probes applied

externally to the head, other electronic signals are picked up by the

probes, but the physician may be interested only in signals occurring at a

particular frequency. By using digital filtering, the signals of interest only

can be presented to the physician.		

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