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# CONTROL-SYSTEM FEEDBACK

 A signal obtained by comparing the output of a control system with the input, which is used to diminish the difference between them.

## Related Terms

### MEAN-SQUARE-ERROR CRITERION

Evaluation of the performance of a control system by calculating the square root of the average over time of the square of the difference between the actual output and the output that is desired.

### FEEDBACK CIRCUIT

A circuit that returns a portion of the output signal of an electronic circuit or control system to the input of the circuit or system.

### AUTOMATIC-CONTROL TRANSIENT ANALYSIS

The analysis of the behavior of the output variable of an automatic control system as the system changes from one steady-state condition to another in terms of such quantities as maximum overshoot, rise time, and response time.

### NONLINEAR FEEDBACK CONTROL SYSTEM

Feedback control system in which the relationships between the pertinent measures of the system input and output signals cannot be adequately described by linear means.

### AUTOMATIC-CONTROL FREQUENCY RESPONSE

The steady-state output of an automatic control system for sinusoidal inputs of varying frequency.

### LOOP GAIN

1. The ratio of the magnitude of the primary feedback signal in a feedback control system to the magnitude of the actuating signal. 2. Total usable power gain of a carrier terminal or two-wire repeater; maximum usable gain is determined by, and may not exceed, the losses in the closed path.

1. The time interval between a change in the input signal to a process control system and the response to the signal.
2. The time interval, after a response to one signal or event, during which a system is unable to respond to another. Also known as insensitive time.

### COMPUTER-CONTROLLED SYSTEM

A feedback control system in which a computer operates on both the input signal and the feedback signal to effect control.

### CONTACTOR CONTROL SYSTEM

A feedback control system in which the control signal is a discontinuous function of the sensed error and may therefore assume one of a limited number of discrete values.

### OBSERVATION SPILLOVER

The part of the sensor output of an active control system caused by modes that have been omited from the control algorithm in the process of model reduction.

### Related questions

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