Rammya, you should probably acquaint yourself with the pluses and
minuses of each filter type.

IIR filters use few resources, and are logarithmic in their rolloff,
therefore 'musical' by nature. But they are not phase linear, and
cannot easily be made to be particularly sharp in their cutoff
characteristics. They can also be unstable.

FIR filters can conceivably be made to any shape, are inherently
stable and can be made phase linear, but they are resource-hungry and
not naturally 'musical,' since their rolloff is linear.

These are the basics. Any good book can tell you more than you want to
know.

David Reaves
On Sat Jan 9, 2010 9:08 am ((PST)) "r...@ymail.com" wrote:
>
> hi...
> I'm new in dsp field.Just a fresher working for Audio product based
> company.
> i have some queries please help me.
>
> 1. why we choose IIR filter design,for practical
> application,especially for processing audio signal.
> 2. Why not FIR?
> 3. Depending on the response there are many IIR
> filter(butterworth,bessel etc).Is there any sub division for FIR?
> 4. What are the disadvantage of FIR filter design over IIR?
>
> waiting for quick response
> with regards
> rammya Start a New Thread

Hello Rammya,

The short answer is that IIR require less computing power. FIR are easier to
design and less prone to instability compared to IIR filters that are more
difficult to design and where poorly designed ones can suffer from stability
issues.

Hope that helps.

Regards,

Ryan Smyth

http://renegademinds.com/

From: a... [mailto:a...] On Behalf
Of r...@ymail.com
Sent: Saturday, January 09, 2010 1:10 PM
To: a...
Subject: [audiodsp] FIR in audio processing

hi...
I'm new in dsp field.Just a fresher working for Audio product based company.
i have some queries please help me.

1. why we choose IIR filter design,for practical application,especially for
processing audio signal.
2. Why not FIR?
3. Depending on the response there are many IIR filter(butterworth,bessel
etc).Is there any sub division for FIR?
4. What are the disadvantage of FIR filter design over IIR?

waiting for quick response
with regards
rammya Start a New Thread

hi...
>I'm new in dsp field.Just a fresher working for Audio product based company.
>i have some queries please help me.
>
>1. why we choose IIR filter design,for practical application,especially for processing audio signal.
>2. Why not FIR?
>3. Depending on the response there are many IIR filter(butterworth,bessel etc).Is there any sub division for FIR?

THOSE FILTERS COME FROM THE ANALOG COUNTERPARTS, SO BY MEANS OF BILINEAR TRANSFORM THEY BECOME IN AN IIR.

>4. What are the disadvantage of FIR filter design over IIR?
>
>waiting for quick response
>with regards
>rammya
TRY GOOGLE "IIR VS FIR"

Regards,
Pablo Start a New Thread

hi...
I'm new in dsp field.Just a fresher working for Audio product based company.
i have some queries please help me.

1. why we choose IIR filter design,for practical application,especially for processing audio signal.
2. Why not FIR?
3. Depending on the response there are many IIR filter(butterworth,bessel etc).Is there any sub division for FIR?
4. What are the disadvantage of FIR filter design over IIR?

waiting for quick response
with regards
rammya Start a New Thread