Binaural Transfer Path Analysis (BTPA)

HEAD acoustics Inc. has developed and refined a powerful binaural transfer path analysis (BTPA) method during the past half decade. It has been successfully used within numerous consulting projects for nearly every major auto manufacturer in Europe.

Binaural Transfer Path Analysis/Simulation

The Binaural Transfer Path Analysis and Simulation (BTPA/BTPS) techniques are used by HEAD acoustics for characterization of individual vehicle noise paths. BTPA/BTPS go beyond traditional TPA techniques in that aurally accurate sound files are created. Each individual path or combination of paths can be listened to independently to assess their respective impact on the overall interior sound quality. It is also possible to use test rig measurements of various components in order to assess the sound quality impacts of component exchange.

The ability to auralize results translates into a powerful sound quality engineering tool, since the user can use his/her own ears to more precisely identify the cause of desirable or undesirable noise patterns. Because binaural audio files are produced, the results can also be analyzed using sophisticated psychoacoustic tools in ArtemiS or played back within a simulation environment (H3S).

Binaural Transfer Path Analysis Examples

A large number of good examples exist for BTPA applied to troubleshoot undesirable powertrain noise patterns. The responsible paths or excitation sources are easily identified using BTPA, and potential solutions can be identified via alteration of existing noise paths. This aids the engineer in identifying cost effective solutions in addition to the individual problem areas. BTPA can also be applied for engine test rig measurements, vehicle noise predictions, and small electric motors. Examples of these can be provided upon request.

Binaural Transfer Path Synthesis Tool

A Windows-based BTPS Tool exists for calculation (synthesis) of sound files. The BTPS Tool automates linking of source files with transfer path filters and permits user selection of calculated transfer paths. This permits the user to select or exclude individual transfer paths for analysis. The user can create new sound files for analysis of simulated transfer path (model) modifications, or apply a given transfer path model to new acceleration source data, i.e. from test rig measurements.

Vehicle Pass-by Noise Simulation

Significant work is being done to advance the measurement and assessment of vehicle pass-by noise beyond the limitations of ISO 362. New approaches are being investigated by HEAD acoustics within a European research project called SVEN (Sound Quality of Vehicle Exterior Noise). An important element within this project is the binaural synthesis of vehicle pass-by noise from individual component recordings. A unique hybrid model using recordings of primary noise sources (exhaust system, intake, engine, tires), Doppler effects, and binaural filters describing the transfer paths from the sources to an artificial head outside the vehicle is being developed. Benefiting from our expertise in vehicle noise simulation (H3S), initial results have been successfully tested and implemented within a new custom software program.

Download the BTPA Flyer (PDF)
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To request more information or a free informal presentation of our capabilities, go to the Request for Information page, or e-mail us at consult@headacoustics.com

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