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- Frequency_response abstract "Frequency response is the quantitative measure of the output spectrum of a system or device in response to a stimulus, and is used to characterise the dynamics of the system. It is a measure of magnitude and phase of the output as a function of frequency, in comparison to the input. In simplest terms, if a sine wave is injected into a system at a given frequency, a linear system will respond at that same frequency with a certain magnitude and a certain phase angle relative to the input. Also for a linear system, doubling the amplitude of the input will double the amplitude of the output. In addition, if the system is time-invariant, then the frequency response also will not vary with time.Two applications of frequency response analysis are related but have different objectives. For an audio system, the objective may be to reproduce the input signal with no distortion. That would require a uniform (flat) magnitude of response up to the bandwidth limitation of the system, with the signal delayed by precisely the same amount of time at all frequencies. That amount of time could be seconds, or weeks or months in the case of recorded media. In contrast, for a feedback apparatus used to control a dynamic system, the objective is to give the closed-loop system improved response as compared to the uncompensated system. The feedback generally needs to respond to system dynamics within a very small number of cycles of oscillation (usually less than one full cycle), and with a definite phase angle relative to the commanded control input. For feedback of sufficient amplification, getting the phase angle wrong can lead to instability for an open-loop stable system, or failure to stabilize a system that is open-loop unstable. Digital filters may be used for both audio systems and feedback control systems, but since the objectives are different, generally the phase characteristics of the filters will be significantly different for the two applications.".
- Frequency_response thumbnail Butterworth_response.svg?width=300.
- Frequency_response wikiPageExternalLink books?id=7QOcDeGFx4UC.
- Frequency_response wikiPageExternalLink books?id=VRailj6TKqUC.
- Frequency_response wikiPageExternalLink filters.
- Frequency_response wikiPageExternalLink Frequency_Response_I.html.
- Frequency_response wikiPageExternalLink freq.html.
- Frequency_response wikiPageID "302033".
- Frequency_response wikiPageRevisionID "596810426".
- Frequency_response hasPhotoCollection Frequency_response.
- Frequency_response subject Category:Control_theory.
- Frequency_response subject Category:Signal_processing.
- Frequency_response comment "Frequency response is the quantitative measure of the output spectrum of a system or device in response to a stimulus, and is used to characterise the dynamics of the system. It is a measure of magnitude and phase of the output as a function of frequency, in comparison to the input. In simplest terms, if a sine wave is injected into a system at a given frequency, a linear system will respond at that same frequency with a certain magnitude and a certain phase angle relative to the input.".
- Frequency_response label "Frequency response".
- Frequency_response label "Frequentierespons".
- Frequency_response label "Frequenzgang".
- Frequency_response label "Reakcja na częstotliwość".
- Frequency_response label "Resposta em frequência".
- Frequency_response label "Respuesta en frecuencia".
- Frequency_response label "Risposta in frequenza".
- Frequency_response label "Réponse en fréquence".
- Frequency_response label "Амплитудно-частотная характеристика".
- Frequency_response label "周波数特性".
- Frequency_response label "频率响应".
- Frequency_response sameAs Frequenzgang.
- Frequency_response sameAs Respuesta_en_frecuencia.
- Frequency_response sameAs Réponse_en_fréquence.
- Frequency_response sameAs Risposta_in_frequenza.
- Frequency_response sameAs 周波数特性.
- Frequency_response sameAs 주파수_응답.
- Frequency_response sameAs Frequentierespons.
- Frequency_response sameAs Reakcja_na_częstotliwość.
- Frequency_response sameAs Resposta_em_frequência.
- Frequency_response sameAs m.01s03j.
- Frequency_response sameAs Q1054694.
- Frequency_response sameAs Q1054694.
- Frequency_response wasDerivedFrom Frequency_response?oldid=596810426.
- Frequency_response depiction Butterworth_response.svg.
- Frequency_response isPrimaryTopicOf Frequency_response.
