FFT Filter
FFT Filter
(OP)
Hello everybody,
I am trying to look at the FFT of a sound signal. I used for it scilab.
The problem I have is that there is a lot of noise,
and I do not know how to remove it.
What kind of filter should I use?
Please answer simply, I am not used to signal treatment analyzis!
thank you
mereaux
I am trying to look at the FFT of a sound signal. I used for it scilab.
The problem I have is that there is a lot of noise,
and I do not know how to remove it.
What kind of filter should I use?
Please answer simply, I am not used to signal treatment analyzis!
thank you
mereaux





RE: FFT Filter
Moving Average Filter (MA Filter). Continuously average the N latest samples.
Oversample and Average. Oversample at Nf and average every N samples.
Both of these techniques reduce the noise by a factor of the square root of N. They are also optimal in the sense that one gets the greatest noise reduction for a minimum decrease in the signal bandwidth.
RE: FFT Filter
(the "bestest" :use PLL to sync the sampling )
If the signal is band-limited, use band/low-pass filter.
If the noise is narrowband, use notch-filter.
If the noise is external, use more directional mike.
and read the FAQ:
<nbucska@pcperipherals DOT com> subj: eng-tips
read FAQ240-1032
RE: FFT Filter
John Solar