**Actuating signal** It is also called error signal (see error signal).

**Asymptote** The path the root locus follows as the parameter becomes very large and approaches infinity.

**Bandwidth** The frequency at which the frequency response declines to 3 dB from its low-frequency value.

**Bode plot** The logarithm of the magnitude of the transfer function is plotted versus the logarithm of *ω*, the frequency. The *ɸ*, of the transfer function is plotted versus the logarithm of the frequency.

**Characteristic equation ** The relation formed by equating to zero the denominator of a transfer function.

**Closed-loop feedback control system** A system that uses a measurement of the output and compares it with the desired output.

**Compensation** The ...

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