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Discussion Groups | Audio Signal Processing | Exponenital Filter design
Technical discussions related to Audio Signal Processing (digital effects, acoustics, noise reduction, musical signal processing, etc).
Exponenital Filter design - gordon_ao - Jan 24 4:41:00 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 is a known time constant. I think an one pole IIR filter will do it: Y[n] = alpha/[1-(1-alpha)Z^(-1)] can simulate the delay effect when alpha < 1. But I am quite pullzing how the alpha will be determined. i'd appreciate if you shed some light on this. Best regards, Gordon Ao
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Re: Exponenital Filter design - Christopher Moore - Jan 24 19:38:00 2005
Dear Gordon, Go to my website http://www.sevenwoodsaudio.com/ and look for Consulting and articles, and find article AN-11. It should be helpful to you. Chris Moore On Mon, 24 Jan 2005 08:41:45 -0000, gordon_ao wrote: 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 is a known time constant. I think an one pole IIR filter will do it: Y[n] = alpha/[1-(1-alpha)Z^(-1)] can simulate the delay effect when alpha < 1. But I am quite pullzing how the alpha will be determined. i'd appreciate if you shed some light on this. Best regards, Gordon Ao ----------------------------------------------------------------------- Seven Woods Audio, Inc. Christopher Moore Concepts, Products, Circuits for Audio Analog/Digital moore@moor... http://www.SevenWoodsAudio.com
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