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My Conferecence Publication


The presentation at IEEE SoutheastCon Conference. The work is published in the conference proceedings

The presentation at IEEE SoutheastCon Conference. The work is published in the conference proceedings

Published in Technology , Education
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  • I am Harikrishnan from University of Kentucky. I would like to present the work done by us on Sound Source detection technique, called Steered Response Power using phase transform.


  • 1. Experimental Performance Analysis of Sound Source Detection with SRP PHAT- β Anand Ramamurthy, Harikrishnan Unnikrishnan, Kevin. D. Donohue Center For Visualization & Virtual Environments Funded in part by NSF EPSCoR Program UNIVERSITY OF KENTUCKY College of Engineering Department of Electrical and Computer Engineering
  • 2. Sound Source Detection
    • Objective :
      • To detect and locate a sound source within a space of interest.
    • Approach
      • Using spatially distributed microphone array.
    • Application
      • Speech recognition
      • Teleconferencing
      • Security surveillance
  • 3. Objective
    • Detection analysis with experimental data to compare the impact of various implementations of whitening process to enhance sound source detection.
  • 4. Steered Response Power
    • Robust algorithm
    • Especially in the presence of multiple interfering sources
    • Each point defined by a unique set of delays to the microphone array
  • 5.
    • Signals received at each microphone aligned together by adding appropriate delay.
    • Coherent power is computed
    • Power estimate used for detection and localization.
    Steered Response Coherent Power
  • 6. SRCP ∑ Compute Coherent Power (x,y,z) Uniquely defines (x,y,z)
  • 7. SRCP …
    • Power estimates get corrupted by noises
      • Interfering sources and ambient noise (Uncorrelated)
      • Reverberations (Highly Correlated)
    Coherent Summation Incoherent Summation
  • 8. PHAT
    • Phase Transform
      • Spectral whitening
    • Lower frequencies have higher contribution to signal power.
    • Higher frequencies also contains significant information (phase).
    • SRCP- PHAT is a measure of coherence and not the signal magnitude.
  • 9. PHAT
  • 10. SRCP – PHAT
    • Works well with broad band signals
  • 11. PHAT - β
    • Speech is a combination of narrow and wideband signal.
    • β - Controls the extend of whitening
    • 0 ≤ β ≤ 1
    • This work aims to find the ideal value for β
  • 12. Experimental Setup Speakers (sound source) Office Wall Microphones Field of View
  • 13. Test Signals Used
    • Broad band : 400Hz – 5600 Hz colored noise
    • Narrowband : 400Hz – 600 Hz colored noise
    • Sampling frequency of 16 kHz
  • 14. Results
  • 15. ROC
    • Receiver Operation Characteristics
    • True Detection vs False Alarm
    • Area under the curve gives an Indication of decision making capability
    • Used in Biomedical, RADAR applications
  • 16. Narrow band Broad band Low reverb. High reverb.
  • 17. Conclusion
    • PHAT – β out performs conventional PHAT in varied operating conditions
    • β ranging from 0.65 – 0.7 would give superior performance for speech signal
    • The results are in close agreement with the previous simulation studies.
      • - Done by Kevin D. Donhue, J. Hannemann and H.G. Dietz
    Signal type Low reverb. High Reverb. Narrow band 0.4 – 0.75 0.2 – 0.7 Broadband 0.65 – 0.9 0.6 – 1