Patent ID: 8565440

Claim:
A method comprising producing a plurality of broadband response files by a process of empirical testing, wherein said broadband response files are convolved with an audio input signal represented as digital samples to produce a stereo output signal (having a left field and a right field) such that said stereo signal emulates the production of said audio signal from a specified audio source location relative to a listening source location, said method comprising the steps of: (a) locating a human subject, having a first ear and a second ear, in an anechoic chamber such that said first ear is at the centre of a three-dimensional originating region, wherein said three-dimensional originating region defines a plurality of test positions; (b) locating an audio microphone adjacent the ear canal of said first ear of said human subject; (c) locating an otoacoustic microphone in the ear canal of said first ear of said human subject; (d) locating a sound source in said anechoic chamber; (e) recording a plurality of reference signals corresponding to each of said plurality of test positions by, for each one of said plurality of test positions: selecting one of said plurality of test positions as a selected test position, playing an output sound through said sound source, said output sound including a plurality of frequencies, recording, as a reference signal, a resulting audio microphone output from said audio microphone and a resulting otoacoustic microphone output from said otoacoustic microphone, (f) deriving an originating signal by: selecting a first reference signal, deconvolving said first reference signal with said output sound to produce a first impulse response signal, selecting a second reference signal, deconvolving said second reference signal with said output sound to produce a second impulse response signal, and combining said first impulse response signal and said second impulse response signal to produce said originating signal; and (g) deconvolving each one of said plurality of reference signals with said originating signal to produce said plurality of broadband response files, each one of which corresponds to one of said plurality of test positions.