Hearing Aid Monaural Signal Spatial Cue Synthesis
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Hearing impaired individuals face challenges in understanding speech in noisy environments due to the internalization of sound sources by traditional hearing aids, which fail to provide effective localization of sound sources, leading to listening fatigue and reduced speech intelligibility.
Innovation Solution
A new hearing aid method that filters monaural audio signals to introduce interaural time and level differences, simulating the Head Related Transfer Function (HRTF) to externalize sound sources, allowing users to perceive sound sources in their correct spatial positions, thereby improving sound source segregation and direction perception.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional hearing aids reproduce sound internally, then hearing loss compensation is achieved, but sound source localization is lost and listening fatigue increases
Solution Approach 1:
The patent uses an intermediary system that processes monaural signals and adds artificial binaural cues (interaural time differences and interaural level differences) to enable sound source localization. The hearing aid system acts as a mediator between the monaural input signal and the user's auditory system, creating virtual spatial information that would otherwise be absent.
Solution Approach 2:
The patent changes the parameters of the audio signal by introducing interaural time differences (ITD) and interaural level differences (ILD) to monaural signals. These parameter modifications create the perception of sound source direction and location, transforming internalized sound into externally localized sound without requiring binaural microphones.
2Reliability
If monaural signals are transmitted to hearing aids, then signal to noise ratio is improved, but spatial cues are lost and sound sources cannot be localized
Solution Approach 1:
The patent creates a copy of the spatial information that would normally be present in binaural signals. By analyzing the monaural signal and generating artificial interaural time and level differences, the system replicates the spatial cues that are inherent in natural binaural hearing, allowing sound source localization from monaural input.
Solution Approach 2:
The patent substitutes the mechanical requirement of binaural signal transmission with a signal processing approach. Instead of requiring two microphones to capture spatial information, the system uses digital signal processing to synthesize spatial cues from a single monaural signal, replacing the need for physical binaural capture with computational spatial information generation.
3Measurement precision
If binaural hearing aid systems are used, then sound localization is improved, but device complexity increases
Solution Approach 1:
The patent makes the hearing aid system universal by enabling it to process both monaural and binaural signals. The same hearing aid can receive monaural signals from assistive listening devices, telecoils, or wireless transmissions and still provide sound source localization through artificial cue generation, eliminating the need for separate binaural microphone systems.
Data Source
AI summary
A new hearing aid is provided in which signals that are received from an external device, such as a spouse microphone, a media player, a hearing loop system, a teleconference system, a radio, a TV, a telephone, a device with an alarm, etc., are filtered in such a way that a user can localize the sound source.