Audio System Measurement and Improvement Group 10 AdvisorJaijeet Roychowdhury TeamMohamud Ismail Franklin Wong Andrew Johnson Garett Kauer

Outline Purpose Solution Requirements / Specs Budget / Timeline Conclusion

Purpose oducts/Dell/dell-a225.jpg _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

Quick Explanation in Frequency Analysis

Our Solution Known Spectrum Unknown spectrum Known after processing

Our Solution

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

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

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

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.

Microphone Selection Graphic provided by Shure Incorporated “Performance Gear Microphone Guide”

Selection Considerations Frequency Response Range of Reception Ease of Use Durability Cost

Frequency Response Ideal ResponseShure PG58 Response Response provided by Shure Incorporated “Performance Gear Microphone Guide”

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

Budget QuantityItemPrice 1PC with Speakers (provided)$0.00 1Shure PG58 microphone$69.95 Total$69.95

Timeline Complete In Progress

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

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

Questions?