filter on hardware

Hi Friends,

I am a new bee in embedded systems. My task is to test a filter(low pass)
with audio in and out connections of hardware board. I have developed a
low
pass filter in C and tested it using goldwave(signal processing tool) and
need guidance on how to test the same filter with audio in and out
connections of hardware.

Thanks in advance.
Aamer

On Mon, 24 Aug 2009 08:55:30 -0500, aamer wrote:

> Hi Friends,
> 
> I am a new bee in embedded systems. My task is to test a filter(low
> pass) with audio in and out connections of hardware board. I have
> developed a low
> pass filter in C and tested it using goldwave(signal processing tool)
> and need guidance on how to test the same filter with audio in and out
> connections of hardware.
> 
> Thanks in advance.
> Aamer

Hi friend.  You must be new to USENET.  Please do a quick web search on 
"cross posting", and find an article that explains the difference between 
cross posting and multiple posting.

Then please don't multiple post any more.

-- 
www.wescottdesign.com

On Aug 24, 2:55&#4294967295;pm, "aamer" <raqeeb...@yahoo.com> wrote:
> Hi Friends,
>
> I am a new bee in embedded systems. My task is to test a filter(low pass)
> with audio in and out connections of hardware board. I have developed a
> low
> pass filter in C and tested it using goldwave(signal processing tool) and
> need guidance on how to test the same filter with audio in and out
> connections of hardware.
>
> Thanks in advance.
> Aamer

You may test in two ways:

1) apply steady state pure sine waves (from a generator) at different
frequencies and measure input versus output - plot the attenuation
against frequency and you have a direct plot of frequency response.

2) apply a short stimulus whose shape you know (eg an impulse, chirp
or MLS) and capture the response. Calculate the FT of each and plot
the difference.

Both cases give you the frequency spectrum.

Chris
======================
Chris Bore
BORES Signal Processing
www.bores.com