Speech Signal Amplification for Hearing Aid Consonant Intelligibility
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Solution Overview
Problem
Hearing aids struggle to maintain intelligibility due to dynamic variations in speech levels, particularly quiet parts of speech being inaudible due to conventional compression methods that fail to adequately amplify consonants without increasing overall signal levels.
Innovation Solution
A method for amplifying speech signals in hearing apparatuses by determining the input level and using a second amplification characteristic that increases amplification below the mean broadband input level, specifically elevating consonant levels relative to vowel levels, thereby enhancing intelligibility without raising the overall signal level.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional compression methods are used to reduce dynamic range, then loud signals are controlled, but quiet parts of speech (consonants) remain inaudible
Solution Approach 1:
The patent implements dynamic amplification characteristics that adapt in real-time based on the detected speech component presence. The system switches between first and second amplification characteristics depending on whether speech is detected, allowing the amplification profile to dynamically adjust to maintain consonant audibility while controlling overall loudness
Solution Approach 2:
The system changes the amplification parameter (gain) based on the detected input level and speech component classification. By determining whether the input sound contains speech components and adjusting the amplification characteristic accordingly, the system optimizes the amplification of quiet consonant sounds without excessively amplifying loud vowels or non-speech sounds
2Reliability
If amplification is increased to make quiet consonants audible, then intelligibility improves, but overall signal level increases causing discomfort
Solution Approach 1:
The patent applies different amplification characteristics selectively based on the type of sound component detected. The second amplification characteristic is specifically applied to speech components, particularly quiet consonants, while the first characteristic handles non-speech sounds and loud signals. This localized approach ensures amplification is applied only where needed for intelligibility without unnecessarily increasing overall signal level
3Reliability
If speech detection is implemented to switch amplification characteristics, then consonant amplification is optimized, but device complexity increases
Solution Approach 1:
The patent segments the amplification process into distinct characteristics (first and second) that are selected based on speech component detection. The system divides the signal processing into classification (detecting speech components) and amplification (applying appropriate characteristic) stages, making the complex function manageable through modular segmentation
Data Source
AI summary
Hearing apparatuses, in particular hearing aids, have improved intelligibility. This is accomplished by a method for amplifying a speech signal for a hearing apparatus by detection of an input sound, determining an input level of the input sound and amplification of the input sound. A mean input level of the input sound is determined and it is established whether the input sound has a speech component. If not, the input signal is amplified in dependence on the input level in accordance with a predefined first amplification characteristic. However, if a speech component is found, the input signal is amplified in dependence on the input level in accordance with a predefined second amplification characteristic. The second amplification characteristic is formed in dependence on the mean input level such that amplification is increased with respect to first amplification characteristic in a predefined level interval below the mean input level.