Speech-based auditory distance display
First Claim
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1. A speech-based virtual audio distance display device comprising:
- a first external input comprising a control computer interface that determines a desired distance of a simulated sound source from an external system driving said display;
a second external input comprising operator selection of a desired listening level;
a non-volatile memory device storing a plurality of pre-recorded speech signals;
a variable mode vocal effort processor determining an appropriate pre-recorded speech signal for a specific application from said non-volatile memory device storing a plurality of pre-recorded speech signals based on said first and second external inputs;
a synthesized speech utterance absolute output level controlling calibration factor scaling said appropriate pre-recorded speech signal output to a listener in accordance with said second external input; and
a head related transfer function virtual audio display processing a signal output from said synthesized speech utterance output level controlling calibration factor and presenting said signal to a listener via headphones.
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Abstract
Device and method for controlling the perceived distances of sound sources by manipulating vocal effort and presentation level of a synthetic voice. Key components are a means of producing speech signals at different levels of vocal effort, a processor capable of selecting the appropriate level of vocal effort to produce a speech signal, and a carefully calibrated audio system capable of accurately matching the RMS power of the signals reaching the listener'"'"'s left and right eardrums to the power that would occur for a sound source 1 m directly in front of the listener in an anechoic environment.
47 Citations
20 Claims
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1. A speech-based virtual audio distance display device comprising:
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a first external input comprising a control computer interface that determines a desired distance of a simulated sound source from an external system driving said display; a second external input comprising operator selection of a desired listening level; a non-volatile memory device storing a plurality of pre-recorded speech signals; a variable mode vocal effort processor determining an appropriate pre-recorded speech signal for a specific application from said non-volatile memory device storing a plurality of pre-recorded speech signals based on said first and second external inputs; a synthesized speech utterance absolute output level controlling calibration factor scaling said appropriate pre-recorded speech signal output to a listener in accordance with said second external input; and a head related transfer function virtual audio display processing a signal output from said synthesized speech utterance output level controlling calibration factor and presenting said signal to a listener via headphones. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method for providing a speech-based auditory distance display comprising the steps of:
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first externally inputting a desired distance of a simulated sound source from an external system driving said display; second externally inputting a desired listening level; storing a plurality of pre-recorded speech signals in a non-volatile memory device; determining an appropriate pre-recorded speech signal for a specific application from said non-volatile memory device storing a plurality of pre-recorded speech signals based on said first and second external inputs using a variable mode vocal effort processor; scaling said appropriate pre-recorded speech signal output to a listener in accordance with said second external input using a synthesized speech utterance output level controlling calibration factor; and processing a signal output from said synthesized speech utterance absolute output level controlling calibration factor with head related transfer functions adding directional cues to said signal and presenting said signal to a listener via headphones. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification