analyzing sound
DESCRIPTION
Analyzing Sound. JUNE 2002 WPI Mathematics in Industry Institute. Mary Ellen Connor Kathy Crowley Judith Doherty Ginny Giordano Cat MacDonald. The Problem. DEKA is working on algorithms for intelligent hearing aids. - PowerPoint PPT PresentationTRANSCRIPT
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Analyzing Sound
Mary Ellen ConnorKathy CrowleyJudith DohertyGinny GiordanoCat MacDonald
JUNE 2002 WPIMathematics in Industry Institute
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The Problem
DEKA is working on algorithms for intelligent hearing aids.
The problems: How do you measure speech intelligibility? What is a phoneme?
The mathematics: Addition of trigonometric functions
The software: MatLab
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Getting Started
We began by doing research in books and online concerning Fourier series Fourier transforms and MatLab. A phoneme is a single component of sound.
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Steps to Understanding
Read Who is Fourier? Jean Baptiste Joseph, Baron de Fourier
French mathematical physicist (1768-1830)
Sound Vibrations of air The graph is periodic. Loudness affects amplitude. Pitch affects the frequency.
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Fourier’s Big Discovery
“No matter how complicated it is, a wave that is periodic - with a pattern that repeats itself - consists of the sum of many simple waves.”
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Steps to Analyzing the Data
Recorded soundsAhhs and eees of each individual
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Say Ahhh!
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MatLab wouldn’t work on Tuesday.
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Got MatLab?
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Working with the software
Imported sounds to MatLabPlotted amplitude vs timeUsed FFT to plot the spectra of the soundsDetermined the peaks and noticed the
peaks occur at equal intervalsThese intervals are multiples of the fundamental
frequencies of each individual’s voice.
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Graphs of Amp vs Time
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Graphs of Amp vs Time
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Zoom in
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Zoom in
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Spectrum of eee graphs
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Spectrum of eee graphs
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Peaks are at nω
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Peaks are at nω
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Filter out all but fundamental f’s
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Zoom in
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Group ahhh and Cat ahhh