This presentation will give you an answer to an interesting question: "Why siren sounds so different?" To relate the analysis to it, please visit http://deepaksharma1992.blogspot.in/2013/05/what-makes-sound-of-siren-so-different.html

1. ?
WHY SIREN SOUNDS SO DIFFERENT
Attempt made to answer the qn. by: Deepak Sharma | Mohit Yadav

2. Introduction to CAST & CREW of the Presentation
• Siren
• Mic
• Data Acquisition System
• Open Room
EXPERIMENT SETUP
AID FOR ANALYSIS
• Audacity
• Wavesurfer

3. HUMAN HEARING
PERCEPTION

4. LOUDNESS

5. SENSITIVITY TO
HIGHER FREQUENCIES

6. PITCH PERCEPTION
Place theory is a theory of hearing which states that our perception of sound depends on where each component
frequency produces vibrations along the basilar membrane.

7. PITCH PERCEPTION
Place theory is a theory of hearing which states that our perception of sound depends on where each component
frequency produces vibrations along the basilar membrane.

8. PITCH PERCEPTION
Place theory is a theory of hearing which states that our perception of sound depends on where each component
frequency produces vibrations along the basilar membrane.

9. EXPERIMENTAL RESULTS

10. ANALYSIS OF A SIREN
USING A SUBTLE
COMAPRISON

11. PITCH RESOLUTION
Place theory is a theory of hearing which states that our perception of sound depends on where each component
frequency produces vibrations along the basilar membrane.

12. FOURIER TRANFORM
SPECTROGRAM
PITCH CONTOURS
(Please see the cover story for
them)

13. REFERENCES
• http://hyperphysics.phy-astr.gsu.edu/hbase/sound/earsens.html
• http://wikipedia.org
• http://personal.cityu.edu.hk/~bsapplec/frequenc.htm
• “Self Acoustics” by Beranek
Thank You