Binaural Sound HRTF Convolution for Precise Visual Localization
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Solution Overview
Problem
Stereo sound in visual entertainment media lacks effective sound localization, limiting the user experience by confining sounds to the loudspeakers or the user's head, failing to spatially match sounds with visual events, and relying on visual cues for sound identification.
Innovation Solution
Implementing binaural sound technology that convolves sound with head-related transfer functions (HRTFs) to localize sounds externally around the user, using wearable electronic devices to provide a more immersive experience by positioning sounds at specific locations relative to the viewer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If stereo sound is used in visual entertainment media, then the sound can be reproduced through loudspeakers, but the sound localization is ineffective and confined to the loudspeakers or user's head
Solution Approach 1:
The patent applies parameter changes by transforming the sound reproduction parameters from standard stereo to binaural parameters. This involves convolving the stereo sound signal with head-related transfer functions (HRTFs) to modify the temporal and spectral characteristics of the sound, enabling precise sound localization that matches the visual events on screen.
Solution Approach 2:
The patent introduces HRTFs as an intermediary element between the stereo sound source and the user's ears. These transfer functions act as a mediator that simulates the acoustic path from various spatial locations to the ears, enabling the brain to perceive sounds as originating from specific locations in the visual scene rather than from the loudspeakers.
2Measurement precision
If binaural sound with HRTF convolution is implemented, then sound localization is improved and sounds can be positioned at specific locations, but the device complexity increases
Solution Approach 1:
The patent applies preliminary action by pre-calculating and storing head-related transfer functions for various spatial locations before actual sound reproduction. These HRTFs are prepared in advance and can be retrieved and applied during playback, reducing the real-time processing complexity while maintaining high localization precision.
Solution Approach 2:
The patent uses copying by creating virtual acoustic environments through digital signal processing. Instead of physically positioning loudspeakers at various locations, the system copies the acoustic characteristics of different spatial positions through HRTF convolution, allowing multiple sound sources to be localized in three-dimensional space using standard stereo equipment.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enhances the user experience by allowing sounds to originate from various locations around the user, enriching the perceived space beyond the screen, and providing a more realistic and immersive auditory experience.
Implementation Method 1
Sound is convolved with head related transfer functions (HRTFs) of the listener
Data Source
AI summary
A method provides binaural sound to a listener while the listener watches a movie so sounds from the movie localize to a location of a character in the movie. Sound is convolved with head related transfer functions (HRTFs) of the listener, and the convolved sound is provided to the listener who wears a wearable electronic device.