Integration time is in analog circuits, the duration of the event time to the signal output ( settling time ). In a digital system, integration time means the length of the time slices that are processed by the measurement algorithm.
The integration time, also the response time, results in analog circuits from the properties of the rectifier circuit. It can be defined as the time it takes for a control loop to respond to an incoming signal. In the case of a limiter , this would be the time from exceeding the threshold value to the start of control. Examples of devices with such a control loop are level meters , limiters and gates. The integration time is the time constant of a measuring device for electrical quantities in order to determine alternating signal values.
With analog level meters , the integration time can be defined as the time from the start of the full-level signal to the display of this level. With the vu meter , for example, 99% of the level is defined as the upper threshold.
In digital measurement systems, the integration time corresponds to the length of the intermediate storage (buffer) used. For audio signals with 48 kHz, you can select 480 words as the buffer length; this example results in an integration time of exactly 10 ms.