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Frequency response & Step response

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watertreader

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step response verses frequency response

Hi, just some doubt on the frequency response and step response. For frequency response, it is true to say that it is the response of the system to a pulse signal at a particular frequency? For step response, it is the response of the system to a step signal.

Is it correct to say so?
 

step response initial condition

watertreader,
You are corrected with respect to step response. However, frequency response addresses the response to sinusoidal signals of various frequencies. In particular, frequency response addresses two parameters:
. The amplitude vs frequency
. The phase (with respect to the input) vs frequency.
Typically the freequency response is plotted as a "Bode plot" in which the frequency is depicted on a logarithmic horizontal scale. The amplitude is depicted in decibels (db) on a vertical scale. The phase is depicted as either degrees or radians on a linear vertical scale.
Regards,
Kral
 

step response with initial conditions

well, when you say step response its not merely the response of system to step signal. there are conditions attached to it.
The input to the system must be a Unit Step Function (not any step signal) and all Initial conditions must be zero.

secondly, you can't say pulse at a particular frequency. because pulse has many frequencies in it. if you want the frequency response of sytem, you must apply a pure sinusoide of known frequency and then sweep the frequency over the range of interest. you should measure both amplitude response and phase response (relative phase differnce between the input and output ) of system .
regards :)
 

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