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Uses of filters

Uses of filters. To remove unwanted components in a signal To “shape” the spectrum of a complex wave To determine spectra of complex waves. SIGNAL. +. FILTER. 6000 Hz. 20000 Hz. 1000 Hz. 100 Hz. =. OUTPUT. 100 Hz. 1000 Hz. 6000 Hz. Linear system.

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Uses of filters

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  1. Uses of filters • To remove unwanted components in a signal • To “shape” the spectrum of a complex wave • To determine spectra of complex waves

  2. SIGNAL + FILTER 6000 Hz 20000 Hz 1000 Hz 100 Hz = OUTPUT 100 Hz 1000 Hz 6000 Hz

  3. Linear system • Changes only amplitude of input components • Does not add additional components • No distortion

  4. Nonlinear system • Changes frequency along with amplitude • Introduces additional components not present in the input signal (frequency domain) • Harmonics • Combination tones • Introduces distortion (time domain)

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