Methods of using head related transfer function (HRTF) enhancement for improved vertical-polar localization in spatial audio systems

摘要

A method of enhancing vertical polar localization of a head related transfer (HRTF). The method includes splitting an audio signal and generating left and right output signals by determining a log lateral component of the respective frequency-dependent audio gain that is equal to a median log frequency-dependent audio gain for all audio signals of that channel having a desired perceived source location. A vertical magnitude of the respective audio signal is enhanced by determining a log vertical component of the respective frequency-dependent audio gain that is equal to a product of a first enhancement factor and a different between the respective frequency-dependent audio gain at the desired perceived source location and the lateral magnitude of respective audio signal. The output signals are time delayed according to an interaural time.

主权项

1. A method of enhancing vertical polar localization of a head related transfer function defining a left frequency-dependent audio gain, a right-frequency-dependent audio gain, and an interaural time delay for a plurality of perceived source locations, the method comprising:
splitting an audio signal into a left audio signal and a right audio signal; generating a left output signal by:
determining a log lateral component of the left frequency-dependent audio gain that is equal to a median log left frequency-dependent audio gain for all left audio signals having a desired one of the plurality of perceived source locations and applying the log lateral component of the left frequency-dependent audio gain to the left lateral magnitude of the left audio signal; anddetermining a log vertical component of the left frequency-dependent audio gain that is equal to a product of a first enhancement factor and a difference between the left frequency-dependent audio gain at the desired one of the plurality of perceived source locations and the left lateral magnitude of the left audio signal and applying the log vertical component of the left frequency-dependent audio gain to the left vertical magnitude of the left audio signal; generating a right output signal by:
determining a log lateral component of the right frequency-dependent audio gain that is equal to a median log right frequency-dependent audio gain for all right audio signals having the desired one of the plurality of perceived source locations and applying the log lateral component of the right frequency-dependent audio gain to the right lateral magnitude of the right audio signal; anddetermining a log vertical component of the right frequency-dependent audio gain that is equal to a product of a second enhancement factor and a difference between the right frequency-dependent audio gain at the desired one of the plurality of perceived source locations and the right lateral magnitude of the right audio signal and applying the log vertical component of the right-frequency-dependent audio gain to the right vertical magnitude of the right audio signal; time delaying the right output signal with respect to the left output signal in accordance with the interaural time delay; and delivering the left and right output signals to left and right ears, respectively, of a listener.