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Uses of filters

Learn how filters remove unwanted components, shape wave spectra, and determine complex wave spectra. Explore linear and nonlinear systems, their effects on input components, and the introduction of additional components and distortion.

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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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