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Digital signal processing (DSP) refers to anything that can be done to a
/ l; j0 @5 c6 ~ z- M* @+ }signal using code on a computer or DSP chip. To reduce certain/ y6 t8 H2 }7 n: D- x* w4 C
sinusoidal frequency components in a signal in amplitude, digital filtering# e2 t( O S( A7 P1 x* _ n |5 j
is done. One may want to obtain the integral of a signal. If the signal( o- }( I' Z; _/ c) z4 I2 C; C, C
comes from a tachometer, the integral gives the position. If the signal is
, j( ~" n) }4 x( unoisy, then filtering the signal to reduce the amplitudes of the noise7 C/ P T0 x- ]: n8 C0 s$ @4 j
frequencies improves signal quality. For example, noise may occur from
2 _) ^6 @( ]. Fwind or rain at an outdoor music presentation. F iltering out sinusoidal
( E2 ?* }7 p) w7 Q ccomponents of the signal that occur at frequencies that cannot be
; Q! T) a. e4 P A5 e& u- X. Y6 aproduced by the music itself results in recording the music with little wind% \& A6 q4 n5 l/ q$ w
and rain noise. Sometimes the signal is corrupted not by noise, but by7 s4 k2 N: y/ g- ^5 u
other signal frequencies that are of no present interest. If the signal is an1 ?& M$ R0 \. O% D3 c" i3 d* N
electronic measurement of a brain wave obtained by using probes applied
) U: @% Z( X" U4 v. b6 u8 }8 }# Texternally to the head, other electronic signals are picked up by the
' ^9 K; L( d9 sprobes, but the physician may be interested only in signals occurring at a
. e1 N `4 R5 p, W" Iparticular frequency. By using digital filtering, the signals of interest only
& j( G3 I. ~ G" W0 l+ M2 I- [can be presented to the physician. |
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发表于 2016-11-3 14:13
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