Digital signal processing

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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
% _$ ^6 e% k( u& }1 msinusoidal frequency components in a signal in amplitude, digital filtering
; ]* v# ?, y7 x1 B8 Qis 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
9 A4 f( t7 _# O+ g! R- Ynoisy, then filtering the signal to reduce the amplitudes of the noise
, R: A! u" d  U* I4 R4 }' Afrequencies improves signal quality. For example, noise may occur from
- I1 r6 ]# U9 `, Jwind 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
; x9 T0 F4 F1 x/ o& S# Aand rain noise. Sometimes the signal is corrupted not by noise, but by
7 J7 K; d7 M7 b3 I5 l! \5 aother 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
0 |, e' Y' l" P; n7 `' |9 oprobes, but the physician may be interested only in signals occurring at a
7 q+ m) w0 f+ Z  l( xparticular frequency. By using digital filtering, the signals of interest only
can be presented to the physician.

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