HRTF Layer Switching for Sound Distance Reproduction
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Solution Overview
Problem
Existing sound reproduction technologies using head-related transfer functions (HRTFs) cannot effectively reproduce a sense of distance for sound sources, such as sounds approaching or moving away from the listener.
Innovation Solution
An information processing device with an output control unit that causes speakers in a listening space to output sound from a prescribed sound source and earphones to output sound from a virtual sound source, using HRTFs corresponding to the sound source position, allowing for sound image localization and reproduction of depth-wise sound movements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If HRTFs are used to reproduce sound images three-dimensionally, then sound image localization is improved, but the ability to reproduce distance sense and depth-wise sound movements deteriorates
Solution Approach 1:
The patent segments the sound reproduction system into multiple HRTF layers, where each layer corresponds to a specific distance range from the listener. By dividing the spatial audio field into discrete depth layers, the system can selectively apply appropriate HRTFs for different distance perceptions, enabling both accurate localization and distance sense reproduction simultaneously
Solution Approach 2:
The patent adds the depth dimension to traditional HRTF-based sound localization by introducing multiple HRTF layers that represent different distances from the listener. This transforms the two-dimensional horizontal/vertical localization into a three-dimensional spatial experience including depth, allowing sounds to be positioned both directionally and at varying distances
2Device complexity
If a single HRTF is used for sound reproduction, then processing complexity is reduced, but the ability to reproduce dynamic sound movements and distance changes deteriorates
Solution Approach 1:
The patent implements dynamic HRTF selection by switching between multiple HRTF layers based on the perceived distance of sound sources. As sound objects move closer or farther from the listener, the system dynamically transitions between appropriate HRTF layers, enabling realistic reproduction of dynamic sound movements and distance changes
Solution Approach 2:
The patent changes the parameter of HRTF selection based on sound source distance. By adjusting which HRTF layer is applied according to the distance parameter, the system adapts the acoustic characteristics to match the perceived spatial position, enabling realistic dynamic movement reproduction without requiring complete redesign of the audio processing system
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
Enables the accurate reproduction of sound distances and movements, enhancing the immersive audio experience by switching between multiple HRTF layers to simulate sounds above, below, and in between the listener.
Implementation Method 1
There is a technique for reproducing a sound image in headphones three-dimensionally using a head-related transfer function (HRTF) which mathematically expresses how a sound travels from the sound source to the ear.
Data Source
AI summary
The present feature relates to an information processing device, an output control method, and a program that allow a sense of distance about a sound source to be appropriately reproduced.An information processing device according to the present feature causes a speaker provided in a listening space to output sound of a prescribed sound source which constitutes the audio of a content and an output device for each listener to output sound of a virtual sound source different from the prescribed sound source, wherein the sound of the virtual sound source is generated by processing using a transfer function corresponding to a sound source position. The present disclosure is applicable to an acoustic processing system in a movie theater.