Transfer functions can generally be decomposed into a minimum phase component, an all-: pass component and a pure delay. Earlier investigations have shown that head related transfer: functions and headphone transfer functions have all-pass components, but if these do not have: an audible impact on the sound it might be beneficial to implement binaural synthesis without: them. A subjective experiment is described in which listeners are presented with signals that: differ only in terms of a second order all-pass section. The results of the experiment are: threshold curves dependent on the center frequency and Q-factor of the all-pass section.
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