Hearing Aid Frequency Shifting for Sound Accuracy
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Solution Overview
Problem
Conventional hearing aids fail to accurately enhance sounds with high frequencies or low intensities, leading to sound distortion and difficulty for hearing-impaired individuals, particularly in languages like Mandarin, where specific phonetic symbols are challenging to discern.
Innovation Solution
A method that identifies high frequency sections in input sounds, increases or decreases their energy, lowers their frequency, and combines these modifications with the lower frequency sections to form a modified sound, which is then amplified, allowing hearing-impaired listeners to better perceive these sounds without distortion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If conventional hearing aids amplify the overall sound energy, then the hearing-impaired listener can hear previously-unheard sounds, but sound distortion occurs during amplification
Solution Approach 1:
The patent segments the input sound signal into multiple frequency bands (e.g., low frequency band below 2kHz, mid frequency band 2-4kHz, high frequency band above 4kHz). Each band is processed independently with different amplification gains, allowing precise control over which frequency components are enhanced without causing overall sound distortion. This segmentation enables the hearing aid to amplify specific frequency ranges where the user has hearing loss while preserving the natural characteristics of other frequencies.
Solution Approach 2:
The patent applies different amplification characteristics to different frequency bands based on the user's specific hearing impairment profile. The amplification gain is not uniform across all frequencies but is customized for each frequency band according to the user's audiogram. This local quality approach ensures that each frequency range receives the appropriate amount of amplification needed for that specific range, improving overall sound accuracy.
2Measurement precision
If high frequency sounds are amplified to help hearing-impaired listeners, then sounds with high frequency become audible, but sound distortion occurs due to excessive amplification
Solution Approach 1:
The patent employs dynamic compression and expansion techniques that automatically adjust the amplification gain based on the instantaneous amplitude and frequency content of the input signal. When high frequency sounds exceed a certain threshold, the system dynamically reduces the gain to prevent distortion, while still providing amplification when the sounds are below the threshold. This dynamic adjustment maintains sound quality while ensuring high frequency sounds remain audible.
Solution Approach 2:
The system incorporates feedback mechanisms that continuously monitor the output signal quality and adjust the amplification parameters accordingly. By analyzing the distorted components in the output, the system can automatically fine-tune the amplification gains for different frequency bands, ensuring that high frequency sounds are amplified without causing distortion. This closed-loop feedback control maintains optimal sound quality.
Data Source
AI summary
A method for enhancing the accuracy of sounds heard by a hearing-impaired listener is disclosed. The method for enhancing the accuracy of sounds heard by a hearing-impaired listener includes receiving an input sound, increasing or decreasing the energy of the high frequency section and then lowering the frequency of the high frequency section, and then combining the low high frequency section with the high frequency section of which the energy was increased/decreased and the frequency was lowered.