On 25 Mar, 11:59, "vimmi" <vimal.veeren...@gmail.com> wrote:
> To all the members of this community,
> iam doing my project on ultrasonic signal processing.
> i need to design a matched filter,to remove the white noise from the
> received signal(it is the signal received by ultrasonic receiver sensor).
> as iam having very little knowledge about signal processing i dont know
> how to design a matched filter practically for a given frequency around
> 40KLHz.The only thing that i know about matched filter is that it performs
> mathematical convolution function.

No, it doesn't. First of all, read up on DSP.

After having done that, you need to find out
exactly what signal you look for. A 'matched
filter' is exactly that - matched - so you can't
use any filter with any signal.

In other words, you need a lot of information:

- The nominal pulse as emitted by the transmitter
signal generator
- Any distorsions of that pulse through the transducer
and into the medium under measurement
- Any distorsions of the recieved pulse through
the reciever

Only when you have a clear idea of these factors do you
know what signal your matched filter should look for.

In addition, you might have to compensate for non-linear
effects, if this is high-power systems.

Rune