The CIPIC HRTF Database

The CIPIC HRTF Database is a public-domain database of high-spatial-resolution HRTF measurements for 45 different subjects, including the KEMAR mannequin with both small and large pinnae.

The database includes 2,500 measurements of head-related impulse responses for each subject. These “standard” measurements were recorded at 25 different interaural-polar azimuths and 50 different interaural-polar elevations. Additional “special” measurements of the KEMAR manikin were made for the frontal and horizontal planes. In addition, the database includes anthropometric measurements for use in HRTF scaling studies, technical documentation, and a utility program for displaying and inspecting the data. Accessing the data requires MATLAB 5x or greater. Additional details are given in the following paper:

V. R. Algazi, R. O. Duda, D. M. Thompson and C. Avendano, “The CIPIC HRTF Database,” Proc. 2001 IEEE Workshop on Applications of Signal Processing to Audio and Electroacoustics, pp. 99-102, Mohonk Mountain House, New Paltz, NY, Oct. 21-24, 2001.

The size of the complete database is approximently 180 MBytes. Instructions for downloading the entire database or certain selected portions of it are given below. Alternatively, if you would like to sample it first, Prof. David C. Mountain of the Department of Biomedical Engineering at Boston University has made the database conveniently available for inspection online at EarLab at Boston University, “Special Collection Searches”

Interested researchers with fast Internet connections are requested to obtain the data via http download. A limited number of CD-ROMs have been prepared for those who have a serious interest in the entire database but who cannot download such large files. If that describes your situation, please mail a please mail a written request on institutional letterhead that includes both your mailing address and your e-mail address to:

Prof. V. Ralph Algazi
CIPIC Interface Laboratory
2343 Academic Surge
1 Shields Avenue
University of California
Davis, CA 95616-8553 USA

Download Files Here

Revision History

Release 1.2 - 09/23/04
	Changes show data files to work with Matlab R7
Release 1.1 - 10/22/01 
	Fixed colorbar bug in show_data Matlab code
Release 1.0 - 8/12/01
	Data provided with 2001 WASPAA CDROM
	IEEE Workshop on Applications of Signal Processing to Audio and Acoustics 

2012 Revision and Upgrade

Pinna images: Photographs of the pinnae of all the subjects in the
database are now made available.

Matlab code for show_data: The Matlab code has been updates to be
compatible with all versions of Matlab up to R2011A.

Full Database download

The entire CIPIC HRTF Database contains the most recent version of the data, software, and documentation.

For a zip file of the entire CIPIC HRTF (MATLAB version) database click here. Note: filesize ~170MB!

For an image file of the entire CIPIC HRTF (MATLAB version) database click here. Note: filesize ~180MB! This binary file can be used to burn a CD of the CIPIC Database. Be sure to save with a right click as some software tries to view the data as a text file.

For the WAV version of the CIPIC HRTF database click here. The MATLAB version is recommended.

CDR inserts in PDF format can be downloaded here. Back Cover and Front Cover

Partial Database Download

Software: Show_data is a collection of Matlab files that can be used to view the “standard” CIPIC HRIR files. The manual for the show_data program can be found in the documentation directory. Note! You need Matlab 5.x or higher to use. And while we have tried to make it bug free 🙂 we can offer no support.

For a tar file of the updated show_data software click here. updated 8/11/04.

The HRTF data inspection program show_data was developed using Matlab 6.0. If you experience Matlab problems using a later release, replace the m-files in the show_data directory with the ones in this tar file.

Data: KEMAR data for both large and small pinna is available in two formats. “Standard”, which is also the format used with our human subjects, consists of measurements recorded at 25 different interaural-polar azimuths and 50 different interaural-polar elevations. The “Special” data set was made at equally spaced intervals for the frontal and horizontal planes. For more information please see the documentation.

The “standard” KEMAR data for large and small pinna is in a tar file here

The “special” KEMAR data is in a tar file here

2012 Revision: Click here to download the folder 2012_Rev that contains the pinna images, the updated show_data code and a read_me file. Note that the updated show_data code should replace the old version.

Documentation Download

The doc directory includes several documents. They are:

  • Documentation for the UCD HRIR files. The documentation includes descriptions of the geometry and coordinate systems.
  • The user manual for the show_data program.
  • Description of the anthropometric parameters in the database.
  • The Revision history.
  • The “WASPAA” Paper referenced above.

To download the CIPIC database documentation click here



This work was supported by the National Science Foundation under grants IRI-96-19339 and ITR-00-86075, and by the University of California DiMI program, with additional support from Aureal Semiconductor, Creative Advanced Technology Center, Hewlett-Packard, and Interval Research Corporation. Any opinions, findings, and conclusions or recommendations expressed in this material are those of the authors and do not necessarily reflect the views of the National Science Foundation or our other sponsors.

System Requirements

The programs and data files use three-dimensional MATLAB arrays, and thus require MATLAB 5.x or higher. It has been tested primarily on PC platforms under Linux and Windows 9x, and may have to be modified to run on other computing systems. Although we welcome reports of problems or suggestions for enhancements, no support of any kind can be provided.


Copyright (c) 2001 The Regents of the University of California. All Rights Reserved



Further, the Regents of the University of California reserve the right to revise this software and/or documentation and to make changes from time to time in the content hereof without obligation of the Regents of the University of California to notify any person of such revision or change.

Use of Materials

The Regents of the University of California hereby grant users permission to reproduce and/or use materials available therein for any purpose- educational, research or commercial. However, each reproduction of any part of the materials must include the copyright notice, if it is present.

In addition, as a courtesy, if these materials are used in published research, this use should be acknowledged in the publication. If these materials are used in the development of commercial products, the Regents of the University of California request that written acknowledgment of such use be sent to:

CIPIC- Center for Image Processing and Integrated Computing University of California 1 Shields Avenue Davis, CA 95616-8553

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