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