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Computer Simulation of the Head-Related Transfer Function

Computer Simulation of the Head-Related Transfer Function. COMP 768 Project Proposal Alok Meshram 10/4/2012. Motivation. Humans listen through two ears In general, each ear receives a different signal The signals received depend on the location of the source relative to the head (delay)

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Computer Simulation of the Head-Related Transfer Function

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  1. Computer Simulation of the Head-Related Transfer Function COMP 768 Project Proposal AlokMeshram 10/4/2012

  2. Motivation Humans listen through two ears In general, each ear receives a different signal The signals received depend on the location of the source relative to the head (delay) They also depend on how the body,especially the head and outer ears, transform sound (intensity) Head-Related Transfer Functions(HRTFs) encode these transforms

  3. Motivation HRTFs play an important role in 3D sound, especially in spatialization The HRTF varies from individual to individual 3D sound rendered through an HRTF that does not “match” the listener does not sound realistic Measuring the HRTF of a person is a complicated and expensive process Instead, computer simulation of a person’s HRTF based on head geometry is much cheaper and less complicated

  4. Background An early work on this topic is Lord Rayleigh’s Duplex Theory (1907) which modeled the head as a sphere Later researchers explored other shapes.The effect of the pinna (outer ear), torso,and shoulders was also modeled

  5. Background These models do not produce satisfactory results Early computer simulation methods to generate HRTFs used the Boundary Element Method (BEM) Later work used the Finite-Difference Time-Domain (FDTD) method

  6. State of the Art and New Challenges The state-of-the-art simulations use the Finite-Difference Time-Domain (FDTD) method Compared to the BEM, this method is faster and less complicated technically These simulations generated more accurate results However, the results still do not match measured HRTFs, especially at higher frequencies Also, these results depend strongly on the accuracy of input geometry

  7. Possible ideas and alternatives Survey of literature on sound simulation to consider methods other than BEM or FDTD See how they compare against FDTD or BEM Using more accurate material parameters for the geometric data Adding shoulders and torso to the geometric data

  8. Proposed Tasks • Goals for this Semester: • Implement method/simulation to generate HRTF • Analyze effect of accuracy and resolution of geometric data • If time permits, extend/modify method to address limitations • Long Term Vision: • Method must work well with geometric data from low-resolution , low-accuracy hardware like webcams or Kinect • Method should be fast and must not be complex

  9. Deadlines and Expected Goals • November 15, 2012: • Minimum: Implement a sound simulation method/system and prepare it for HRTF Simulation • December 13, 2012: • Minimum: Get simulation results and perform analysis for at least two different geometric datasets • Extended: Implement a second method (could be an extension or modification of the first) and compare results

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