Headphones Virtual Surround Sound HRTF Processing

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Solution Overview

Problem

Headphones typically provide only stereo sound, resulting in an inferior listening experience compared to surround sound systems, as they fail to simulate the binaural hearing capabilities of humans, which rely on timing, intensity, and frequency variations to localize sound sources.

Innovation Solution

The method involves processing audio using Head Related Transfer Function (HRTF) filters to emulate multiple speakers in 3D space, allowing headphones to simulate surround sound by extracting and rendering audio elements on virtual speakers positioned in a specific layout, including Front Center, Front Left, Front Right, Surround, High Frequency, and Low Frequency Effect sources.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If headphones provide only stereo sound, then the device complexity is low, but the listening experience quality is inferior

Engineering Contradiction:

Improvedevice complexityVSAvoidlistening experience quality

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

The patent creates virtual copies of multiple physical speakers by processing stereo audio through HRTF filters. Instead of requiring actual multiple speakers, the system synthesizes the acoustic characteristics of front, side, and rear speakers through digital signal processing, allowing a simple headphone device to emulate complex surround sound functionality.

Inventive Principle:

Principle #26Copying

Solution Approach 2:

The patent replaces the mechanical arrangement of multiple physical speakers with a digital audio processing system. By substituting physical speaker placement with computational audio manipulation using HRTF filters, the system achieves surround sound effects without the mechanical complexity of multiple transducers.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Reliability

If headphones use HRTF processing to simulate multiple speakers, then the listening experience quality improves, but the device complexity increases

Engineering Contradiction:

Improvelistening experience qualityVSAvoidaudio processing complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent employs pre-computed HRTF filter coefficients that are stored in advance for different speaker positions and listener orientations. Instead of performing complex real-time calculations, the system retrieves pre-processed filter data and applies it through straightforward convolution operations, significantly reducing computational complexity while maintaining high audio quality.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The system adjusts audio parameters by applying frequency-dependent HRTF filters that modify timing, intensity, and spectral characteristics of audio signals. By changing these parameters through filter application rather than complex spatial rendering, the system achieves realistic sound localization with manageable processing requirements.

Inventive Principle:

Principle #35Parameter changes

3Measurement precision

If headphones process audio to emulate 3D space speakers, then sound localization accuracy improves, but the audio processing time increases

Engineering Contradiction:

Improvesound localization accuracyVSAvoidaudio processing time

Core Design Contradiction:

Measurement precisionVSLoss of time

Solution Approach 1:

The patent pre-computes HRTF filter coefficients for various spatial positions and stores them in lookup tables. During audio playback, the system simply retrieves the appropriate pre-computed filters based on the virtual speaker position and applies them through efficient convolution, avoiding time-consuming real-time spatial calculations while maintaining accurate sound localization.

Inventive Principle:

Principle #10Preliminary action

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

This approach enables a realistic virtual surround sound experience on headphones by applying spatial cues to audio elements, enhancing sound localization and providing a more immersive listening experience similar to traditional surround sound systems.

Implementation Method 1

processing audio using Head Related Transfer Function (HRTF) filters

Methodology Applied

Scientific EffectHead Related Transfer Function (HRTF):

Data Source

PatentUS10397730B2Methods and systems for providing virtual surround sound on headphones

Publication Date: 2019.08.27 GLOBAL DELIGHT TECH PVT LTD

AI summary

Method and system for providing virtual surround sound on headphones using input audio. Embodiments herein relate to sound processing and more particularly to providing surround sound on headphones. Embodiments herein disclose a method and system for simulating surround sound on a headphone, by emulating multiple speakers in 3D space by processing audio using Head Related Transfer Function (HRTF) filters and other audio processing filters, wherein the input to the headphone is stereo input.