Audio System Measurement and ImprovementAdvisor Jaijeet Roychowdhury

Team Mohamud IsmailFranklin WongAndrew JohnsonGarett Kauer

Outline

Purpose Solution Requirements / Specs Budget / Timeline Conclusion

Purpose

http://www.techexcess.net/images/products/Dell/dell-a225.jpg

http://www.theage.com.au/ffximage/bose_wideweb__470x367,2.jpg

Turn Cheap Dell A225 PC Speakers

Into speakers comparable to much more expensive speakers with an easy to use device that has a low consumer cost

Purpose

http://www.carstereohelp.com/images/PontiacStrMonsoon06280201.jpg

102

103

104

-200

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0Frequency Response of Speakers

frequency (Hz)

dB

SolutionSpeaker MicrophoneComputer

Feedback

Solution

-60

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-40

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-10

0

Frequency Response of white noise

frequency (Hz)

dB

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-10

0

Frequency Response of Speakers

frequency (Hz)

dB

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0

Frequency Response of Microphone

frequency (Hz)

dB

-60

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0

Frequency Response of Room

frequency (Hz)

dB

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0

Frequency Response of Entire System

frequency (Hz)

dB

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0

Entire System after precoding

frequency (Hz)

dB

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103

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0

Frequency Response of Entire System

frequency (Hz)

dB

102

103

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0

Entire System after precoding

frequency (Hz)

dB

Specifications / Requirements

All software used must be open source/zero cost All software used must be Linux compatible Resulting source should be distributed as open-

source Final deliverable must have an easy to use UI Resultant H(s) should be flat to within 5dB over

100Hz-10kHz

Budget

Quantity Item Price

1 PC with Speakers (provided) $0.00

1 Shure PG58 microphone $69.95

Total $69.95

Timeline

Task Name Start Finish

Audio Enhancement Device 1/28/2008 5/13/2008get linux box up and running 1/28/2008 2/15/2008find and purchase microphone 1/28/2008 2/22/2008link microphone and PC 2/25/2008 2/29/2008implement Xfer Fn finder/invertor 3/3/2008 3/7/2008link transfer function to ALSA 3/10/2008 3/14/2008test 3/17/2008 3/28/2008create user friendly UI 3/31/2008 4/11/2008prepare final prototype 4/14/2008 4/25/2008buffer 4/28/2008 5/13/2008

E B M E B M E B M E B M EJanuary February March April May

Conclusion

Software development will be open source, created to operate using a Linux system. Project software will comprise two separate systems. The first will be used to measure the audio response within a room by interfacing with a microphone. The second system will be used to correct the speaker output to adjust for linear non-idealities produced by the audio system and room acoustics.

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