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Discussion Groups | Audio Signal Processing | Audio Equalizer

Technical discussions related to Audio Signal Processing (digital effects, acoustics, noise reduction, musical signal processing, etc).

  

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Audio Equalizer - akin...@hotmail.com - May 5 8:58:35 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,
Akin Ocal

------------------------------------


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Re: Audio Equalizer - Christopher Moore - May 5 21:09:16 2008

Akin --

Go to freescale.com and search for two Application Notes, AN2110 (stereo 
10 band EQ with code for 563xx ICs). There is an earlier version 
covering the same application, but limited to 56xxx earlier chips and I 
don't have the APP Number handy/

Best

Chris Moore
a...@hotmail.com wrote:
>
> 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,
> Akin Ocal
> ------------------------------------------------------------------------
>
> No virus found in this incoming message.
> Checked by AVG. 
> Version: 7.5.524 / Virus Database: 269.23.8/1415 - Release Date: 5/5/2008 6:01 AM
>   

-- 
-----------------------------------------------------------------------
Seven Woods Audio, Inc.                Christopher Moore
Concepts, Products, Circuits for Audio    Analog/Digital
m...@SevenWoodsAudio.com
http://www.SevenWoodsAudio.com


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Re: Audio Equalizer - Gene Goff - May 8 6:05:28 2008

Just be aware that the graphic EQ in the freescale app note may not give reciprocal
boost/cut filter responses.  I implemented their grapic EQ from their original app note APR2/D
"Digital Stereo 10-Band Graphic Equalizer" about 12 years ago and it worked but the
boost vs. cut transfer  functions are not reciprocal and therefore have different filter shapes
(non-reciprocal filters).  See my post about 2 months ago regarding how to derive reciprocal EQ
transfer functions.

Regards,
Gene


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