I have a white nose problem and hope to have your kind advice. I am sorry
there must be something wrong in my idea and maybe really dumb. I am not major
in DSP and recently this DSP thing drove me crazy.
I want to generate a white nose with unite amplitude 0.3 and frequency range
from 0 -2.687.(all these values are non-dimensional). I integrated the following
to get the signal of time domain:
The maximum frequency is 2.687, its fundamental period is 0.3721.So I set the
time interval is 0.3721/10 to ensure it can capture the maximum frequency
sufficiently. I set the minimum frequency is 2.687/320 which means j=1,2..320
in the above integration. In order to capture the minimum frequency, I set the
signal time length as 2560*0.3721 which is much larger the period of minimum
frequency. Then by using matlab, I generated the white noise signal and its
amplitude spectra. But its amplitude had a relatively large fluctuation from the
desired 0.3. I tried to increased time domain and frequency integration number I
an J , but I cannot get improved results.
Besides, for my simulation case, I eventually need to get a filtered white noise
from which a narrow band low frequency 0.04-0.08 will be removed. Based on above
parameters, I failed to generate it. Is it due to that the band is narrow or
low? Whats my problem? Any advice would be greatly appreciated.
Regards,
Zhao Xijing
white noise generation and filtering some band
Started by ●January 11, 2006