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Digital signal processing (DSP) refers to anything that can be done to a& ?1 V9 Q9 v0 y; Z Q# }/ [
signal using code on a computer or DSP chip. To reduce certain
" I& {; H2 u+ c5 w7 l, ysinusoidal frequency components in a signal in amplitude, digital filtering* ~5 b) j; Q/ U$ I* @
is done. One may want to obtain the integral of a signal. If the signal+ h9 h$ v1 \9 M7 F- e2 `; y. i3 [
comes from a tachometer, the integral gives the position. If the signal is
$ b! \' I5 y. d) O; c3 {; M; W% Ynoisy, then filtering the signal to reduce the amplitudes of the noise
# E, O5 g0 b/ ~frequencies improves signal quality. For example, noise may occur from5 K2 J/ f3 Z, V0 Q Y, A% y
wind or rain at an outdoor music presentation. F iltering out sinusoidal9 V- u( u$ A f
components of the signal that occur at frequencies that cannot be1 ]/ H" X: d3 f0 j
produced by the music itself results in recording the music with little wind
) X5 L3 f9 B7 O% jand rain noise. Sometimes the signal is corrupted not by noise, but by4 [6 D0 d7 r+ W2 S) U4 V3 F$ f
other signal frequencies that are of no present interest. If the signal is an* z2 ?6 \3 k# z+ a2 c. ?" Q: I
electronic measurement of a brain wave obtained by using probes applied
$ _0 M& `. c6 }, n6 Zexternally to the head, other electronic signals are picked up by the) N% ^' F4 C- {( S0 v( U
probes, but the physician may be interested only in signals occurring at a
% P9 A9 D2 [7 `5 {2 {2 O& ^particular frequency. By using digital filtering, the signals of interest only
) w P+ A7 F, acan be presented to the physician. |
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发表于 2016-11-3 14:13
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