Digital signal processing

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Digital signal processing (DSP) refers to anything that can be done to a
- x1 x1 h9 w+ G$ B- ^9 psignal using code on a computer or DSP chip. To reduce certain
1 E8 }0 o8 S$ v" o' n2 hsinusoidal 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
6 }* x$ t: o" M* \( O  D, F8 m* c  rnoisy, then filtering the signal to reduce the amplitudes of the noise
8 p4 O  l! z6 h: r- U1 e& k( [frequencies improves signal quality. For example, noise may occur from
wind or rain at an outdoor music presentation. F iltering out sinusoidal
- }. I1 W0 |! I4 ycomponents of the signal that occur at frequencies that cannot be
produced by the music itself results in recording the music with little wind
  z) l6 ?: y) B- @/ ^and rain noise. Sometimes the signal is corrupted not by noise, but by
* _. b6 Q4 Z, D. `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
6 |6 R& V. x% Q; ?' q+ Jexternally 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
, A3 B3 u5 L- s  Scan be presented to the physician.

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