SYNTHESIZING 3D SOUND SYNTHESIZING 3D SOUND AND AND SOUND - - PowerPoint PPT Presentation

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May 20, 2023 24 likes •106 views

SYNTHESIZING 3D SOUND SYNTHESIZING 3D SOUND AND AND SOUND LOCALIZATION SOUND LOCALIZATION Eric Fuller Eric Fuller Banky Omodunbi Banky Omodunbi Sheng_Lung Lee _Lung Lee Sheng Head Related Transfer Functions Head Related Transfer

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SYNTHESIZING 3D SOUND SYNTHESIZING 3D SOUND AND AND SOUND LOCALIZATION SOUND LOCALIZATION

Eric Fuller Eric Fuller Banky Omodunbi Banky Omodunbi Sheng Sheng_Lung Lee _Lung Lee

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Head Related Transfer Functions Head Related Transfer Functions

  An HRTF is an impulse response from the source of the

An HRTF is an impulse response from the source of the sound to the human ear drum. sound to the human ear drum.

  It is caused by the effect of a human

It is caused by the effect of a human’ ’s head and ears. Each s head and ears. Each person person’ ’s perception of a given sound signal varies with s perception of a given sound signal varies with his/her his/her pinna pinna structure. structure.

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Generating 3D Sound Generating 3D Sound

  3D sound is generated by convolution of a

3D sound is generated by convolution of a given HRTF with the input sound signal. given HRTF with the input sound signal.

  Based on a selected azimuth and elevation

Based on a selected azimuth and elevation value a given HRTF is used. value a given HRTF is used.

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Sound Localization Sound Localization

  There is a slight delay between when a sound

There is a slight delay between when a sound arrives at the left and right ears. arrives at the left and right ears.

  Cross-Correlation of the signals at each ear can

Cross-Correlation of the signals at each ear can be used to determine the delay between them. be used to determine the delay between them.

  The delay can be used to find azimuth of the

The delay can be used to find azimuth of the sound source with the equation: sound source with the equation:

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The Onset Algorithm The Onset Algorithm

  Echoes can interfere with a simple cross-

Echoes can interfere with a simple cross- correlation method. correlation method.

  The sound can be treated with the Onset

The sound can be treated with the Onset Algorithm, making the cross-correlation Algorithm, making the cross-correlation immune to echoes. immune to echoes.

  The Onset Algorithm places more emphasis

The Onset Algorithm places more emphasis

n the beginning of the sound signal.
n the beginning of the sound signal.

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Onset Algorithm Onset Algorithm

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Correlation Examples Correlation Examples

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