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Workshop in Computer Science Multivariate Modeling Sound and Interactive Multi-Media

Explore the integration of computer science and music to analyze ECG signals in real-time, utilizing multivariate modeling techniques for accurate biomedical feedback. Learn about temporal and amplitude features and how to normalize output parameters effectively. Follow instructions to use the ECG analyzer and experience the fascinating connection between data analysis and music production with Max/MSP. Connect for a live data presentation and engage with the immersive process.

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Workshop in Computer Science Multivariate Modeling Sound and Interactive Multi-Media

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  1. Workshop in Computer ScienceMultivariate ModelingSound and Interactive Multi-Media 0368-3500-07, Autumn 2004-5 Prof. Nathan Intrator Reuven Aronashvili Oded Ashkenazi

  2. FlowDiagram Musical Effects

  3. Introduction

  4. ECG Analyzer • The parameters from left to right are: • R to R time in milliseconds. • R to R time normalized. • Variance of the R peaks amplitude. • S to S time in milliseconds. • S to S time normalized. • Variance of the S peaks amplitude. • Variance of the T peaks amplitude. • T – S amplitude values.

  5. Normalizing Output • The Temporal parameters are shown twice. Once in milliseconds, and once Normalized by dividing by twice their mean. Resulting in range of [0,1] around 0.5. • The Amplitude parameters are normalized by dividing by the signals std. (The mean of the signal is 0)

  6. Theory and Algorithms • Temporal features • Amplitude features

  7. Temporal features • Example: Calculating R – R time • Select the top 13% of the signal • Reduce to zero ECG signal from Digitizer~ Signal from R_Peaks

  8. Amplitude features • We use the timing from the temporal features to open a window and capture the wanted values into signals. (R, S and T) • We measure the difference between those signals maximum and minimum.

  9. Example: T wave ECG signal from Digitizer~ Signal after 75% cutoff Maximum in each time frame (R & T)

  10. How To Use ? 2 1 3 4 5

  11. How To Use ?Instructions: • First install the digitizer. • Select ECG input source. (Left for digitizer / right for raw input file). • Turn Patch ON. (Light should turn red). • If input is a raw file, click Load File and select a raw float64 file. • Press PLAY. (Light should turn green). • Wait 60 seconds until results start coming.

  12. Next Step - Music • The Parameters are passed on to Max/MSP object created by Mor and Shahar. • These affect the music in such a way that will result in an accurate biomedical feedback.

  13. The Fun Part • Presentation of live data. • Lets connect Oded…

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