Cochlear Implant Sound Localization via Enhanced Interaural Level Difference
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Bilateral cochlear implant patients face challenges in accurately localizing sound due to conventional systems' inability to effectively represent binaural cues, primarily because the electrode leads convey low frequency acoustic content to high frequency auditory nerve fibers, causing conflicting ILD information.
Innovation Solution
A sound processing system determines the interaural difference between audio signals from both ears and generates an enhanced ILD, which is encoded into the low frequency acoustic content, ensuring consistent ILD information is presented to the lateral superior olive, improving sound localization by directing the cochlear implants to generate electrical stimulation accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional cochlear implant systems are used, then the system structure is simple, but sound localization capability is poor due to inability to accurately represent binaural cues
Solution Approach 1:
The patent changes the parameter of ILD encoding by generating an enhanced ILD that is frequency-specific and tailored to match the patient's auditory nerve fiber characteristics. This involves computing ILD values for different frequency bands and selectively enhancing low-frequency ILD information to be conveyed to high-frequency fibers, thereby improving sound localization without requiring fundamental system restructuring
Solution Approach 2:
The patent introduces an intermediary processing step that computes and enhances ILD information before presenting it to the cochlear implant electrodes. This intermediary enhancement process acts as a mediator between the raw binaural input and the final electrical stimulation, allowing accurate binaural cue representation through signal processing rather than hardware modification
2Productivity
If low frequency acoustic content is conveyed to high frequency auditory nerve fibers, then the cochlear implant can transmit low frequency information, but conflicting ILD information is presented to the brain
Solution Approach 1:
The patent applies local quality by making the ILD enhancement frequency-specific. Different frequency bands receive different ILD enhancement treatments, with low-frequency ILD information being enhanced for transmission to high-frequency fibers. This localized processing ensures that each frequency band carries appropriate ILD cues without creating conflicts
Solution Approach 2:
The patent inverts the conventional approach by not directly conveying low-frequency acoustic content to high-frequency fibers, but instead computing enhanced ILD values from low-frequency information and presenting them in a format suitable for high-frequency fiber stimulation. This inversion resolves the conflict by presenting consistent ILD information in the appropriate frequency domain
Data Source
AI summary
An exemplary system for facilitating sound localization by a bilateral cochlear implant patient includes 1) a processing facility configured to determine an interaural difference between a first audio signal detected by a first microphone associated with a first ear of a bilateral cochlear implant patient and a second audio signal detected by a second microphone associated with a second ear of the bilateral cochlear implant patient and generate, based on the determined interaural difference, an enhanced interaural level difference (ILD) associated with the low frequency acoustic content of the first and second audio signals and 2) a control facility configured to direct a first cochlear implant associated with the first ear and a second cochlear implant associated with the second ear to generate electrical stimulation representative of the low frequency acoustic content in accordance with the enhanced ILD. Corresponding systems and methods are also disclosed.