# Phase response

> Mediated Wiki article. Canonical URL: https://mediated.wiki/source/Phase_response
> Markdown URL: https://mediated.wiki/source/Phase_response.md
> Source: https://en.wikipedia.org/wiki/Phase_response
> Source revision: 885612544
> License: Creative Commons Attribution-ShareAlike 4.0 International (https://creativecommons.org/licenses/by-sa/4.0/)

{{Use American English|date = March 2019}}
{{Short description|Effect of filters or amplifiers on signals' phases as function of frequency}}
In [signal processing](/source/signal_processing), '''phase response''' is the relationship between the [phase](/source/phase_(waves)) of a [sinusoid](/source/Sine_wave)al input and the output [signal](/source/signal_(information_theory)) passing through any device that accepts input and produces an output signal, such as an [amplifier](/source/amplifier) or a [filter](/source/filter_(signal_processing)).<ref name="JOS">{{cite web |last1=Smith |first1=J.O. |title=Introduction to Digital Filters with Audio Applications |url=http://ccrma.stanford.edu/~jos/filters/ |website=JOS |publisher=J.O. Smith |accessdate=1 February 2019 |ref=JOS}}</ref>

Amplifiers, filters, and other devices are often categorized by their amplitude and/or phase response. The amplitude response is the ratio of output amplitude to input, usually a function of the frequency. Similarly, phase response is the phase of the output with the input as reference. The input is defined as zero phase. A phase response is not limited to lying between 0° and 360°, as phase can accumulate to any amount of time.

==See also==
* [Group delay and phase delay](/source/Group_delay_and_phase_delay)

==References==
{{reflist}}

{{DEFAULTSORT:Phase Response}}
Category:Trigonometry
Category:Wave mechanics
Category:Signal processing

{{Tech-stub}}

---
Adapted from the Wikipedia article [Phase response](https://en.wikipedia.org/wiki/Phase_response) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/Phase_response?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.