white noise and impulse function

[m_ratheesh_k]

Hi,
can any one pls calrify the following doubt
whether impulse fucntion and white noise haveing smae MAgnitude response OR PHASE REPSONSE OR BOTH??

tHANKS
mrk

 

[jasmin_123]

The unit mpulse function and white noise are signals, not circuits, and, therefore,
have nothing to do with frequency responses.

If you like to know their Fourier transforms, then that of the unit
impulse function (at zero time) has a uniform amplitude spectrum
and a zero phase spectrum; white noise has a uniform amplitude
spectrum and a random phase spectrum.

 

[kastantin]

in estimation of frequqncy respose of a system we can use either thess signal because they have flat spectrum

 

[mhamed]

white noise has random characteristic. So it cannot be characterized by fourier transform as the other deterministic signals such as impulse signal can. instead white noise or any other random processes are characterized by their probabilities specifications. for example white noise has constant variance. So it can be charecterized by power spectrum which is constant over all frequency.