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Digital signal processing (DSP) refers to anything that can be done to a
6 `0 ~/ r4 h) Zsignal using code on a computer or DSP chip. To reduce certain
5 s1 L; z, \8 Usinusoidal frequency components in a signal in amplitude, digital filtering6 u% W3 C9 l' c: z% B
is done. One may want to obtain the integral of a signal. If the signal9 ~; ~$ ]2 K/ a% T* c
comes from a tachometer, the integral gives the position. If the signal is( D9 f% ^1 X( M# m' I5 M2 x; X; I
noisy, then filtering the signal to reduce the amplitudes of the noise7 A2 L- U: z! \/ V% v7 o7 j
frequencies improves signal quality. For example, noise may occur from( l( Z4 A# ` Z% I
wind or rain at an outdoor music presentation. F iltering out sinusoidal6 s4 ]. C% s x
components of the signal that occur at frequencies that cannot be
$ `# a+ [% A V1 ]/ C" d9 r3 fproduced by the music itself results in recording the music with little wind
1 j9 m6 z/ y) ]. e. c' r" L+ Fand rain noise. Sometimes the signal is corrupted not by noise, but by: w1 w+ i$ w0 v) n
other signal frequencies that are of no present interest. If the signal is an
6 l, i+ |* Y2 P$ f+ g3 X- belectronic measurement of a brain wave obtained by using probes applied$ Y. t! B f5 }) l: |5 j9 G. ?: w
externally to the head, other electronic signals are picked up by the
2 n ~9 x5 \* a: wprobes, but the physician may be interested only in signals occurring at a( A$ S& ?; b+ G0 @& p3 W) q9 M
particular frequency. By using digital filtering, the signals of interest only
# n' V" L1 w5 U1 V' O3 dcan be presented to the physician. |
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发表于 2016-11-3 14:13
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