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Technical discussions related to Audio Signal Processing (digital effects, acoustics, noise reduction, musical signal processing, etc).
Search Results for "iir"
Converting FIR from IIR [7 Articles]
itza...@yahoo.co.in - Sep 20 2007
Hi all,
I have designed a FIR filter which has 60 DB SNR.Also I designed IIR filter at 60 DB SNR. FIR taps is around 700 whereas IIR is 12.
So I want to design IIR.But I want li... 
FIR in audio processing
Rajmathi S - Jan 10 2010
Hi Rammya,
1. Why we choose IIR filter design for practical application, especially for processing audio signal?
We can design an IIR Filter of far less order than an FIR f... Generating Chirp/LFM by using IIR filters [2 Articles]
keta...@gmail.com - Sep 5 2006
Help needed in designing chirp generator and pulse compressor using iir filters (this amounts to using an IDT, I guess).
I want to generate chirp using an IIR filter.
I want... Audio IIR filter never settles after the initial error input
gordon_ao - Jun 5 2004
Hello all,
A simple question actually. Just found an issue with IIR low pass
filter in decimation low pass after the SINC filter in a Sigma Delta
A/D system. The one bit inp... FIR in audio processing [4 Articles]
ramm...@ymail.com - Jan 9 2010
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 applica... Is the use of IIR filters for audio processing is a good idea?. [3 Articles]
kssubrahmanya - May 6 2005
Hi all,
what are the effects of using IIR filter on audio signal?.
... abt IIR filters and DSPs
Sameer Kibey - Jul 25 2003
hi all
I am interested in implementation of cascaded second order IIR filters. Do i
necessarily have to use a floating point DSP for this application? Any
serious drawback if a... Implementing IIR filter
samu...@yahoo.com - Jan 8 2010
Hi,
I have just designed an IIR filter in Matlab and I need to implement it in a dsPIC, but I think there is some mistakes in my implementing procedure! I have a 4th order filter ... IIR audio filtering [2 Articles]
daro...@yahoo.fr - Sep 1 2008
Hi !
I have little experience with time filtering ,ad i'd very much appreciate some input. So here's the deal:
I'm trying to enhance audio with some non-linear processing
so bas... resampling of an IIR filter [3 Articles]
stefanosorrentino - Nov 28 2002
Hello friends.
I have an apparently unsolvable problem:
I have a given IIR filter (they give me the poles and the zeros).
The filter was originally sampled at a given (very high... How to design an IIR filter using slope(db/oct) information [5 Articles]
care...@rediffmail.com - Mar 3 2005
Topic : To design an IIR HPF filter using IPP(Intel Integrated Performance
Primitives) library.
Current need: to calculate BW or Q from slope.
The specification of filter is :... Exponenital Filter design [2 Articles]
gordon_ao - Jan 24 2005
Hello Folks
At the moment I am trying to design a one pole simple IIR digital
filter to simulate exponential delay effect with simple equations
like 1 - e^(-t/T), where T i... 1-Bit Goertzel Algorithm Performance [2 Articles]
dn...@newelltech.com - May 14 2007
I'm implementing a DTMF detector using the Goertzel Algorithm.
I have raw simulations built using Excel (I know...) and am getting some interesting results.
I don't see a lot o... Overflow in IIR filters
Carsten Borg - Jan 3 2001
I'm implementing a resampling (decimation) filter on a fixed-point platform
(c54x) as a cascade of second-order-section IIR filters. Unfortunately my
implementation is very sens... How to design filter to match both magnitude and phase
gordon_ao - Sep 11 2003
Hello folks,
I would really appreciate your insight in terms of how to design
digital filters to match both magnitude and phase of a narrow band
complex Analog gain(simple 1s... Re: reinventing the 1/3 octave wheel [3 Articles]
David Reaves - May 14 2009
Bill,
Given enough coefficients, FIR filters can replicate just about ANY
curve.
But, when creating banks of octave-related (or 1/3 octave) filters,
IIR filters are more ... Audio Equalizer [2 Articles]
akin...@hotmail.com - May 5 2008
Hi
I want build a multiband ( 10 band) 2-channel audio equalizer with FIR or IIR filters. Can you suggest any sample project or ready library for that purpose ?
Regards,
Aki... About Implementing A Sound Equalizer [2 Articles]
akin...@hotmail.com - Apr 20 2008
Hello ,
I want to build a multiband equalizer. I know that I must create bandpass filters for that aim.
So should they be FIR or IIR filters and why ?
Is there any sampl... FIR & IIR : design,filtering
akin...@hotmail.com - Apr 23 2008
Hello
I am using some FIR and IIR filters. I use coefficients from Dsptutor's java applets. First of all , have you ever experienced Dpstutor's designs on projects ?
I am us... Octave and 1/3-octave bandpass filter bank [6 Articles]
hank...@in.waw.pl - Apr 8 2005
Hi everyone,
My previous post was not submitted, so I decided to write it again.
I'm supposed to design a bandpass filter bank (octave and 1/3-octave) for audio measurements ... slope of a filter
ramm...@ymail.com - Jan 28 2010
hi all
Thanks to all who ever respond to my previous queries.
I want the technical counterpart or derivation regarding 5the slope of filter
1. why 1st order filters have a 20... 90 degrees phase shifter
palm...@hotmail.com - Nov 26 2009
Hi,
I need to make a 90Âș phase shifter for a digital crossover audio system.
I've heard something about Hilbert Transform but I would like to know if it is the best way to do a ... Data types in Audio Signal Processing
akin...@hotmail.com - Apr 20 2008
Hello
I want to implement my own audio equalizer.
First of all I create FIR& IIR bandpass filters but they process"doubl" or "float" samples. But I get sound samples as sh... Howling rejection
Curl - Oct 16 2001
Hello
My aim is to set up a howling detector (and canceller)
I tried an adaptive IIR notch filter (using LMS), but I have still problems with this system (due to harmonics freq... Allpass filters design with a desired phase response
palm...@hotmail.com - Dec 27 2009
Hi,
I know, IIR allpass filters are used for phase equalization
Can anybody help me about how I can get the coeficients for a desired phase response?
Thanks
... Re: Frequency response
Erik de Castro Lopo - Nov 29 2007
rendoddi wrote:
> Suppose you have H(z)=B(z)/A(z), the transfer function of a digital
> filter.
> How do you calculate the ANALYTIC expression of the filter's impulse
> r... fractional-octave band filters via FFT
normanrg - Feb 26 2004
Does anyone out there have experience or info in how to construct
fractional-octave bandwidth filters using FFTs? It does not seem to
be an accepted method, yet I cannot under... Re: Amplitude Estimation
Bernhard Holzmayer - Jun 21 2006
1st of all I'm using 512 taps on a 256 Samples Per Second signal. I
know I can eliminate the coefficients that are close to zero and still
get pretty much the same response... Optimal envelope extraction from an audio signal [3 Articles]
Brett Carruthers - Apr 27 2006
Hello,
I am currently using a digital 1000 point lowpass filter to extract
the envelope from an audio signal of which I have removed the
negative components (by using the ab... kingsbury filter [2 Articles]
Goh Kean Leong RBMA/ESD - Sep 2 2002
hi all forum yahoo group members,
I have few question regarding a type of IIR filter structure that name
as "kingsbury filter". This type of filter structure is claim to b... RE: Speech Noise
Egler, Mark - Mar 7 2002
Marcio,
If you design a second-order low-pass Butterworth "analog-prototype" IIR filter, which just about any digital filter design package can ... Biquad filtering with Fs/Fo > 200 [4 Articles]
dgen...@engmail.uwaterloo.ca - Oct 29 2007
I'm designing a parametric equalizer using a spartan 3e starter board and a TI PCM codec I wired to it, running at 48kHz. I decided to use the biquad IIR filter core from opencore... RE: AUTOMATIC EQUALIZER
THEOPHILUS MEDEIROS - Jan 28 2005
I thought of using adaptive filtering, but since it's a pahse coerrection. It might not be that easy. I plan on doing this using offline filtering. I just have to calibrate... Chamberlin state variable filter transfer function [3 Articles]
kt...@am3d.com - Mar 29 2009
Hi,
I am comparing coefficient quantization errors for second order IIR filter structures (for fixed point implementation). I have found the Chamberlin state variable structure to... Re: Re: Equalizers [3 Articles]
Jeff Brower - Mar 3 2008
Gene-
> The advantage of the parallel architecture is that it will give you the same filter combining response as an analog
> graphic EQ; that is, adjacent filters will inter... Re: DTMF decoding using fixed-point arithmetic
Amaresh patil - Apr 28 2006
Hi
The format of the data needs careful selection. it is not strainght. I would suggest you to first find out the max and min value of delay output data format and current o... Re: audio interpolation
Grzegorz Kraszewski - Dec 15 2005
Hello sunil@suni...
> Please, can anybody tell how can I remove the hiss noise from the
> interpolated audio signal? Here, I am simulating the interpolation using
> c-program a... Re: Guitar Valve Preamp with DSP
Bernhard Holzmayer - Oct 2 2006
On Tuesday 26 September 2006 07:09, williamluisterry wrote:
> Hi. I've working with al TMS320C613 DSK building some guitar effects.
> I was suscesfully whit all of these but I ... Re: Filter Order in Analog and Digital [6 Articles]
Jeff Brower - Mar 22 2005
Glidden-
> Thanks for you email. In the figure, I see the slope (coming down on
> the right side) change, just like mine (it just looks like a sag) !!! I will
> sent you t... RE: Unknown Filter Type
Egler, Mark - Jan 14 2005
I
looked it up myself, and I was wrong. A Volterra filter is not recursive, i.e.
it's FIR but with polynomial terms. What Jon has is recursive (IIR) and I
haven't found a...