HRTF Measurements of a KEMAR Dummy-Head Microphone

Abstract

An extensive set of head-related transfer function (HRTF 1 ) measurements of a KEMAR dummy head microphone has recently been completed. The measurements consist of the left and right ear impulse responses from a Realistic Optimus Pro 7 loudspeaker mounted 1.4 meters from the KEMAR. Maximum length (ML) pseudo-random binary sequences were used to obtain the impulse responses at a sampling rate of 44.1 kHz. In total, 710 different positions were sampled at elevations from-40 degrees to +90 degrees. Also measured were the impulse response of the speaker in free field and several headphones placed on the KEMAR. This data is being made available to the research community on the Internet via anonymous FTP and the World Wide Web. 1 Measurement technique Measurements were made using a Macintosh Quadra computer equipped with an Audiomedia II DSP card, which has 16-bit stereo A/D and D/A converters that operate at a 44.1 kHz sampling rate. One of the audio output channels was sent to an amplif...