Limitations in using Golay codes for head-related transfer function measurement
Pavel Zahorik · The Journal of the Acoustical Society of America · 2000
Although the use of Golay codes has been recommended for measuring external-ear impulse responses [Zhou et al., J. Acoust. Soc. Am. 92, 1169–1171 (1992)], this report demonstrates a potential limitation that could arise in applications requiring probe stimulus excitation to last longer than a few hundreds of milliseconds. In such situations, artifacts in the measured impulse responses can result from using Golay codes if the system under evaluation is time variant. These impulse-response artifacts are demonstrated for measurements of human binaural impulse responses (equivalent to head-related transfer functions, or HRTFs) under conditions analogous to small head movements during the measurement procedure. A popular alternative impulse-response measurement technique using maximum-length sequences (MLSs) does not produce artifact-contaminated measurements under the same conditions.