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DSP Filter Design

Hi,

I have developed the hardware for an acoustic Active Noise Reduction module. The module accepts a microphone input which drives a DSP (ADAU1772 by Analog Devices), then drives a speaker. The idea is that the software in the DSP applies an inverse transfer function of the microphone and speaker combined, so as to present a 180 degree phase shifted sound out of the speaker, which cancels the input sound to the microphone. I have a basic profile that works, but it is limited in the fact that the phase of the mechanical system starts at 0 degrees out of phase at low frequencies and extends to about 360 degrees out of phase at 2kHz. To develop an inverse DSP transfer function would mean a phase lead filter or something along those lines where the phase lag is the most at low frequencies. I realize the mechanical system is not exactly minimum phase, so an exact solution is not needed. Given that I am not trying to go against causality, I am happy for the system to lag behind an acoustic cycle or 2, I just need a filter that provides 360 degrees phase lag at low frequencies and then very little phase lag at 2kHz. The aim is that this filter be implemented using a bi-quad IIR arrangement, or group of bi-quad IIRs within the Analog Devices Sigma Studio software environment, to be used on an ADAU1772 DSP.

Please let me know if you are interested.

Kind regards

Charles

Færdigheder: Digital Design, Elektronik, Indbygget Software

Se mere: the design cycle, studio 180 design, sound design needed, sound by design, solution design group, sigma design, mechanical design software, design hardware, design degree, design cycle, design 360, cycle design, bi active, analog devices, acoustic sound design, 360 design, sound design studio, IIR, Design mechanical, design a filter, causality group, analog filter design, active filter, Acoustic, dsp filter

Om arbejdsgiveren:
( 0 bedømmelser ) Durban, Croatia

Projekt-ID: #6048244

9 freelancere byder i gennemsnit $754 for dette job

geekyexperts

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anshulmttl12

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antrikshsingh03

A proposal has not yet been provided

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WebBahl

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zackappsios

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xcodejok

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chyconsl

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djshah99

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$1111 USD in 35 dage
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iyerks

I have lot of experience working with DSPs and audio - built an accostic emission system for a customer recently. Used Microchip parts and codecs(TI did not work well enough ). However, my DSP of choice is from TI. Mere

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dubc1968

I can provide you with the firmware for the device indicated but the specifications about the phase don't look very clear for me, it would need a Phase/Freq diagram. Other specifications would be the sampling frequency Mere

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beananil

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