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

Workshop in Computer Science Multivariate Modeling Sound and Interactive Multi-Media. 0368- 3500-07 , Autumn 2004-5 Prof. Nathan Intrator. Reuven Aronashvili Oded Ashkenazi. Flow Diagram. Musical Effects. Introduction. ECG Analyzer. The parameters from left to right are:

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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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