Hearing Aid Spatial Enhancement via Signal De-correlation
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Solution Overview
Problem
Hearing aids fail to effectively enhance the spatial aspects of music listening for individuals with hearing loss, leading to a diminished experience due to deficits in perceiving binaural cues that convey spaciousness, which is preferred by listeners with normal hearing.
Innovation Solution
The implementation of signal processing techniques in hearing aids that mimic the acoustic effects of well-designed concert halls by de-correlating audio signals between the two ears through phase jittering and convolving with head-related impulse responses, enhancing spatial awareness and sound quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If hearing aids amplify and process sound to compensate for hearing losses, then speech intelligibility is improved, but the spatial aspects and richness of music listening are diminished due to loss of binaural cues
Solution Approach 1:
The patent introduces an intermediary processing stage that analyzes the audio signal and selectively applies spatial enhancement techniques. This intermediary layer separates the speech enhancement functions from the spatial cue preservation functions, allowing both objectives to be achieved simultaneously through coordinated processing stages rather than conflicting single-stage processing
Solution Approach 2:
The patent dynamically adjusts audio processing parameters based on the detected audio content and listening environment. By changing parameters such as gain distribution, frequency weighting, and spatial enhancement intensity according to whether the input is speech or music, the system optimizes both speech intelligibility and spatial perception for different listening scenarios
2Device complexity
If conventional hearing aids process audio signals monaurally or with simple binaural processing, then device complexity is reduced, but the spatial awareness and music listening experience are degraded
Solution Approach 1:
The patent segments the audio processing into distinct functional modules: speech enhancement module, music enhancement module, spatial analysis module, and binaural cue preservation module. Each module handles specific aspects of audio processing independently, allowing complex spatial processing to be achieved through coordinated simple operations rather than a single complex processing stage
Solution Approach 2:
The patent implements a universal processing framework that handles both speech and music enhancement using the same hardware infrastructure. The system automatically adapts the processing algorithm based on content detection, allowing a single device configuration to provide optimized processing for multiple audio types without requiring separate dedicated systems
Data Source
AI summary
Described herein are techniques for artificially enhancing spaciousness in a hearing aid to improve the music listening experience. Such spatial enhancement is produced by doing signal processing in the hearing aid that mimics the acoustic effects of well-designed concert halls. The same techniques can also be applied to improving the experience of listening to recorded music reproduced and amplified over a speaker system, or to music streamed to the direct-audio input of a hearing aid.