Prev: how can i vectorized the triple integral
Next: help me to find time-frequency plot
From: Ashwini Deshpande on 13 Nov 2009 00:48
Hi,

I have a simple model, in that i am adding 3 sine waves of 5Hz, 10Hz and 20Hz frequencies. The resultant wave, i am passing it through a bandpass filter which has to pass only frequencies between 8-12 Hz and block rest all. But which is not happening. For the same i am using the bandpass filter block of signal processing blockset.

I tried to set the frequencies both in normalized way as well as normal way (using Hz).
At the output spectrum i will see peak at all the 3 input frequencies. But i suppose to get peak at only desired freq.

Can anyone help me in setting the parameters of bandpass filter.

Thanks,
Ashwini
From: Rick Rosson on 13 Nov 2009 10:20
Hi Ashwini,

What sampling rate are you using for the three sine waves? Are you setting
the sampling rate for the filter to the same value?

HTH.

Rick



"Ashwini Deshpande" <vd.ashwini(a)mathworks.com> wrote in message
news:hdiruh$h9f$1(a)fred.mathworks.com...
> Hi,
>
> I have a simple model, in that i am adding 3 sine waves of 5Hz, 10Hz and
> 20Hz frequencies. The resultant wave, i am passing it through a bandpass
> filter which has to pass only frequencies between 8-12 Hz and block rest
> all. But which is not happening. For the same i am using the bandpass
> filter block of signal processing blockset.
>
> I tried to set the frequencies both in normalized way as well as normal
> way (using Hz).
> At the output spectrum i will see peak at all the 3 input frequencies. But
> i suppose to get peak at only desired freq.
>
> Can anyone help me in setting the parameters of bandpass filter.
>
> Thanks,
> Ashwini


From: Ashwini Deshpande on 13 Nov 2009 23:56
"Rick Rosson" <no.spam(a)spammer.abc> wrote in message <hdjtfo$3m$1(a)fred.mathworks.com>...
> Hi Ashwini,
>
> What sampling rate are you using for the three sine waves? Are you setting
> the sampling rate for the filter to the same value?
>
> HTH.
>
> Rick

Thanks ..
even after setting the Fs of BPF same as sampling frequency of waves, the effect of other frequencies is still there.
If required i can mail my model.

-- Ashwini
 | 
Pages: 1
Prev: how can i vectorized the triple integral
Next: help me to find time-frequency plot