Frequency-Dependent Focusing in Cochlear Implants
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Solution Overview
Problem
Current steering in cochlear implant systems can compromise spectral resolution, particularly in audio signals with spectral peaks, leading to a loss of fine frequency components and increased perception of undesirable noise.
Innovation Solution
Implementing a frequency-dependent focusing method where the sound processor divides audio signals into analysis channels, applying more focusing to low-frequency channels to preserve spectral resolution and less or no focusing to high-frequency channels to minimize noise perception and power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If current steering is applied to create intermediate frequency perceptions, then sound perception is augmented, but spectral resolution is compromised due to spectral broadening
Solution Approach 1:
The patent applies different focusing strategies to different frequency channels based on their specific requirements. Low-frequency channels receive strong focusing to preserve spectral resolution for critical spectral peaks, while high-frequency channels use weaker or no focusing. This local differentiation resolves the contradiction by tailoring the stimulation approach to the specific needs of each frequency region rather than applying a uniform current steering strategy across all channels.
Solution Approach 2:
The patent dynamically adjusts the degree of focusing applied to different channels based on the audio signal characteristics and frequency content. The system adapts its focusing strength in real-time, applying stronger focusing when spectral peaks are detected in low-frequency regions and reducing focusing for high-frequency regions. This dynamic adjustment allows the system to optimize both sound perception and spectral resolution across varying listening conditions.
2Measurement precision
If focusing is applied to preserve spectral resolution, then frequency components are improved, but power consumption increases
Solution Approach 1:
The patent applies focusing selectively and differentially across frequency channels rather than uniformly across all channels. By concentrating focusing resources on low-frequency channels where spectral peaks are most critical for speech intelligibility, and reducing or eliminating focusing in high-frequency channels, the system achieves high spectral resolution where needed while minimizing overall power consumption.
Solution Approach 2:
The patent applies partial focusing - not full focusing - to high-frequency channels while applying strong focusing to low-frequency channels. This partial application of the focusing strategy to certain frequency regions allows the system to achieve adequate spectral resolution for speech understanding without the excessive power consumption that would result from applying full focusing across all frequency bands.
3Loss of information
If current steering is used to represent spectral peaks, then audio signal representation is improved, but undesirable noise perception increases
Solution Approach 1:
The patent applies strong focusing locally to low-frequency channels where spectral peaks are most important for speech representation, while using weaker or no focusing for high-frequency channels. This localized approach preserves the representation of critical spectral peaks in the low-frequency range while minimizing the generation of artificial noise in high-frequency regions, thereby reducing overall noise perception.
Solution Approach 2:
The system dynamically adjusts focusing strength based on the detected audio signal characteristics. When spectral peaks are identified in low-frequency regions, the system applies strong focusing to preserve these peaks. When high-frequency content is present, the system reduces focusing to minimize artificial noise generation. This dynamic adaptation allows the system to represent spectral peaks accurately while minimizing noise perception across varying audio conditions.
Data Source
AI summary
An exemplary system includes a processing facility and a control facility. The processing facility is configured to 1) divide an audio signal presented to a cochlear implant patient into a plurality of analysis channels each containing a frequency domain signal, and 2) maintain data representative of a crossover frequency. The control facility is configured to 1) direct a cochlear implant to apply electrical stimulation representative of each frequency domain signal included in a plurality of low frequency analysis channels located below the crossover frequency in accordance with a low frequency stimulation strategy that includes a degree of focusing, and 2) direct the cochlear implant to apply electrical stimulation representative of each frequency domain signal included in a plurality of high frequency analysis channels located above the crossover frequency in accordance with a high frequency stimulation strategy that includes a lesser degree of focusing than the low frequency stimulation strategy.