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Audio System Measurement and Improvement

Audio System Measurement and Improvement. Outline. Purpose Solution Requirements / Specs Budget / Timeline Conclusion. Purpose. 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.

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Audio System Measurement and Improvement

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  1. Audio System Measurement and Improvement

  2. Outline • Purpose • Solution • Requirements / Specs • Budget / Timeline • Conclusion

  3. Purpose 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 http://www.techexcess.net/images/products/Dell/dell-a225.jpg http://www.theage.com.au/ffximage/bose_wideweb__470x367,2.jpg

  4. Quick Explanation in Frequency Analysis http://www.carstereohelp.com/images/PontiacStrMonsoon06280201.jpg

  5. Our Solution Known Spectrum Unknown spectrum Known after processing

  6. Our Solution http://www.copystars.com/images_products/shure_pgx24pg58_s19016.jpg http://blog.audiovideointeriors.com/1206mountain.1.jpg

  7. Software Design • What Software Does • Measurement System • Measures, Displays and Compares Transfer Functions • De-embedding/Correction System • Generates Inverse Transfer Function • Precodes Output • Done Using ALSA

  8. Software Design • Specifications To Meet • Measurement System • Greater than 20dB of relative nulling over 1-5kHz • De-embedding/Correction System • Corrected transfer function • Flat to within 5dB over 100Hz-10kHz

  9. Software Design • ALSA • Advanced Linux Sound Architecture • Provides audio and MIDI functionality to Linux • Handles Sound Device Drivers • User Space Library • Simple Application Programming • Provides High Level Functionality

  10. Software Design • ALSA • Efficient support for all types of sound devices • Fully modularized sound drivers • Thread-safe design • Supports Open Sound System (OSS) 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.

  11. Microphone Selection Graphic provided by Shure Incorporated www.shure.com “Performance Gear Microphone Guide”

  12. Selection Considerations • Frequency Response • Range of Reception • Ease of Use • Durability • Cost

  13. Frequency Response Ideal Response Shure PG58 Response Response provided by Shure Incorporated www.shure.com “Performance Gear Microphone Guide”

  14. Range of Response • Reception at <15cm • Direct proximity to Microphone head • Simulates Ear perception

  15. Budget

  16. Timeline Complete In Progress

  17. In Conclusion… • Want to improve cheap speakers • Correct the distortion inherent in room and speakers • End-user needs only software and a microphone • Software should be free and easy to use http://www.popculturecomics.com/graphics

  18. Project Future • Created software distributed as open- source, but… • Load software onto small self-contained device • No PC needed • Commercial potential

  19. Questions?

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