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Listening to Music Through Hearing Aids: Potential Lessons for Cochlear Implants
1Cambridge Hearing Group, Department of Psychology, 2152University of Cambridge, Cambridge, England.
Trends in Hearing
|February 18, 2022
Summary
Music listening with hearing aids (HAs) and cochlear implants (CIs) faces distortion due to high peak levels. Solutions involve improved analog-to-digital converters (ADCs) and advanced automatic gain control (AGC) strategies for better music dynamic range.
Area of Science:
- Audiology
- Biomedical Engineering
- Signal Processing
Background:
- Users of hearing aids (HAs) and cochlear implants (CIs) encounter difficulties listening to music, particularly with high peak sound levels common in live performances.
- The limited dynamic range of microphones and analog-to-digital converters (ADCs) in HAs and CIs can lead to signal overload and audible distortion.
Purpose of the Study:
- To identify and address the challenges faced by HA and CI users when listening to music, focusing on signal distortion and dynamic range compression.
- To explore potential technological solutions for improving music perception in users with hearing loss.
Main Methods:
- Analysis of signal processing techniques used in HAs and CIs for managing music audio.
- Evaluation of automatic gain control (AGC) strategies, including single-channel and multi-channel approaches, and their impact on music fidelity.
- Consideration of advanced ADC resolutions (e.g., 24-bit) and adjustable gain implementations.
Main Results:
- High peak levels in live music (up to 120 dB SPL) can cause overload and distortion in HAs and CIs due to limited dynamic range.
- Standard single-channel AGC in CIs can attenuate all frequency components when a strong narrowband signal is present and cause cross-modulation effects.
- Potential solutions include using higher-resolution ADCs, adjustable gain, multi-channel processing for gain control, and slow-acting AGC.
Conclusions:
- Addressing the dynamic range mismatch between music and the limited auditory range of CI users is crucial for improving music perception.
- Advanced signal processing, such as multi-channel slow-acting AGC and higher-resolution ADCs, offers promising avenues for reducing distortion and enhancing music enjoyment for HA and CI users.
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