HRTF Audio Processing for Surround Sound on Stereo Headphones
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Solution Overview
Problem
Traditional headphones provide only a dual channel listening experience, which is not immersive enough, and users with varying hearing characteristics experience suboptimal sound perception due to inadequate frequency compensation.
Innovation Solution
An audio signal processing method and apparatus that separates dual channel audio signals into multiple channels, applies head-related transfer functions to simulate audio sources at specific positions, and compensates audio signals based on individual hearing characteristics to create a surround sound experience.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional dual channel headphones are used, then the device complexity is low, but the immersive sound experience and surround sound capability are insufficient
Solution Approach 1:
The patent segments the dual channel audio signal into multiple virtual channels (front left, front right, back left, back right) by separating and processing different frequency components. The left and right channel signals are divided into high-frequency and low-frequency parts, which are then routed to different virtual speaker positions through head-related transfer functions, creating a multi-channel surround sound effect from traditional stereo headphones.
Solution Approach 2:
The patent adds spatial dimensionality to the audio experience by mapping 2D stereo signals to 3D virtual speaker positions around the user. By applying head-related transfer functions and frequency-based separation, the system creates virtual sound sources at different azimuth and elevation angles, transforming planar stereo audio into spatial surround sound without adding physical speakers.
2Adaptability or versatility
If frequency compensation is not applied, then the processing is simple, but users with different hearing characteristics experience suboptimal sound perception
Solution Approach 1:
The patent applies local quality by implementing frequency-specific processing and individualized hearing compensation. Different frequency bands (high-frequency and low-frequency components) are processed differently through separate head-related transfer functions. Additionally, the system adapts to individual user hearing characteristics by applying customized compensation filters to specific frequency ranges where the user has deficiencies, rather than applying uniform processing to all frequencies.
Data Source
AI summary
An audio signal processing method is provided. The method separates a left and a right channel audio signal to a center-left and center-right channel audio signals, and a side-left and side-right channel audio signals, and processes the center and side channel audio signals by a Head Related Transfer Function (HRTF) so as to simulate the audio signals into several audio source positions related to a user, then synthesizes the processed audio signals into dual channel audio signals according to the user's hearing characteristics by a frequency compensation process. The invention further provides an audio signal processing apparatus to perform the audio signal processing method.