Patent ID: 6195434
Filing Date: 2001-02-27
Classification: H04S

Abstract:
A method of providing a headphone set with sound signals such that a listener will perceive the sound as coming from a source outside of the listener's head, said method comprising the steps of:accepting first and second input signals from a signal source;processing each said first and second input signal so as to produce modified sound signals for presentation to the respective first and second inputs of a headphone set;said processing step including the steps of:azimuth adjusting a first portion of said first input signal into at least two output signal portions, one signal portion being delayed and attenuated with respect to the other;ranging a second portion of said first input signal, said ranging dependent in part on the configuration of a room model, the output of said ranging step being two signals modeled on early reflections based on the room model;summing said first modeled signal with the undelayed and unattenuated azimuthally adjusted signal and summing said second modeled signal with the delayed and attenuated azimuthally adjusted signal; andpassing each said summed signal portion through a Head Related Transfer Function (HRTF) to create input signals for presentation to said first and second inputs of said headphone set, the summed delayed and attenuated azimuthally adjusted signal being for presentation to said second input of said headphone set and the summed undelayed and unattenuated azimuthally adjusted signal being for presentation to said first input of said headphone set.