Thread Subject: Creation of simple HF filter...

Hallo!

Could you help me please to create a simple HF filter in
Matlab with the following frequency characteristic:

K(w)= A/(B+jw), where A and B real constants, j - imaginary
unit, w - circular frequency...

Thank you in advace for quick and clear help...

Andrey Kazak wrote:
> Hallo!
>
> Could you help me please to create a simple HF filter in
> Matlab with the following frequency characteristic:
>
> K(w)= A/(B+jw), where A and B real constants, j - imaginary
> unit, w - circular frequency...
>
> Thank you in advace for quick and clear help...

Is the signal to be filtered in the frequency domain or time domain? If
it's in the frequency domain, here's some pseudocode...

  w = 1:100; % vector of frequencies
  sigspec = rand(1,100); % vector containing the spectrum of your signal
  A = 10;
  B = 10;
  filtsig = sigspec .* (A ./ (B + 1j * w)); % filtered signal

If your signal is in the time domain, calculate the cutoff frequency of
your filter and use the BUTTER function to compute coefficients for your
low pass filter. Those coefficients can be passed into the FILTER
function along with your original signal to produce a time domain
filtered result.

--
Dave
dvt at psu dot edu

"Andrey Kazak" <AK@nospam.ru> wrote in message
<fn2ega$etc$1@fred.mathworks.com>...
> Hallo!
>
> Could you help me please to create a simple HF filter in
> Matlab with the following frequency characteristic:
>
> K(w)= A/(B+jw), where A and B real constants, j - imaginary
> unit, w - circular frequency...
>
> Thank you in advace for quick and clear help...

help bilinear