Related Experiment Video
Updated: Dec 31, 2025
06:04
Systematic Hearing Performance Evaluation Process for Adolescents with Cochlear Implantation at Early Ages
Published on: March 24, 2023
712
Considerations on Adaptive Gain and Frequency Response in Hearing Aids
Joost M Festen1, Janette N Van Dijkhuizen1, Reinier Plomp1
1Department of Otolaryngology, Free University Hospital, Amsterdam, The Netherlands.
Acta Oto-Laryngologica
|January 8, 2020
Summary
Sensorineural hearing loss requires improved signal-to-noise ratio for speech. Adaptive hearing aids can selectively amplify intelligible speech frequencies, enhancing audibility and reducing masking effects for better communication.
Area of Science:
- Audiology
- Signal Processing
- Hearing Science
Background:
- Sensorineural hearing loss (SNHL) impairs speech reception, necessitating higher signal-to-noise ratios (SNR) compared to normal hearing.
- Hearing impairment can cause cross-frequency masking, where noise in one frequency band affects audibility in others.
- Existing hearing aids may not adequately address the complex spectral and temporal processing deficits in SNHL.
Purpose of the Study:
- To propose an adaptive hearing aid signal-processing scheme to improve speech intelligibility for individuals with SNHL.
- To selectively amplify frequency bands crucial for speech intelligibility while maintaining audibility in other bands.
- To investigate the audiological principles and signal processing characteristics for effective hearing aid design.
Main Methods:
- Development of a signal-processing scheme for adaptive hearing aids based on audiological principles.
- Utilizing the Articulation Theory to define spectral amplification characteristics.
- Employing the Modulation Transfer Function (MTF) to determine temporal adaptation requirements.
- Evaluating speech transmission quality using the Speech Transmission Index (STI).
Main Results:
- A signal-processing strategy is proposed to selectively amplify relevant speech frequencies, reducing masking.
- The Articulation Theory provides a framework for optimizing spectral shaping in hearing aids.
- Modulation Transfer Function analysis informs the necessary temporal adaptation capabilities.
- Short-time constant amplitude compression was found to degrade speech transmission quality (STI).
Conclusions:
- Adaptive hearing aids with selective frequency band amplification can enhance speech reception in noise for SNHL listeners.
- The proposed signal-processing scheme offers a potential solution to mitigate masking effects in impaired hearing.
- Careful consideration of spectral and temporal processing is crucial for effective hearing aid design, avoiding detrimental effects like those from rapid amplitude compression.
Related Concept Videos
01:20Frequency Response of Op Amp Circuits
589
Operational amplifiers (op-amp) are used in signal conditioning, filtering, or for performing mathematical operations such as addition, subtraction, integration, and differentiation. The frequency response of an op-amp is an important aspect that describes how the gain of the amplifier varies with frequency.
Frequency Response and Gain:
The gain of the op-amp, A(ω), is not a constant but a function of the input signal frequency. An op-amp can maintain a constant gain at low frequencies, known...
Frequency Response and Gain:
The gain of the op-amp, A(ω), is not a constant but a function of the input signal frequency. An op-amp can maintain a constant gain at low frequencies, known...
589
01:25Active Filters
1.2K
Active filters are electronic circuits that use operational amplifiers (op-amps), resistors, and capacitors to filter out unwanted frequency components from a signal. A first-order low-pass active filter is designed to pass signals with a frequency lower than a certain cutoff frequency and attenuate frequencies higher than that cutoff frequency. The transfer function for a first-order low-pass active filter is:
1.2K
01:24Effects of feedback
915
Feedback in control systems plays a critical role in shaping various operational parameters, extending beyond simple error reduction to influence stability, bandwidth, gain, impedance, and sensitivity. Understanding these effects requires examining a basic feedback system characterized by defined input, output, error, and feedback signals.
Feedback significantly modifies the gain of a control system. The gain of a system without feedback is altered by a factor of one plus GH, where G represents...
Feedback significantly modifies the gain of a control system. The gain of a system without feedback is altered by a factor of one plus GH, where G represents...
915
01:25Network Function of a Circuit
561
Frequency response analysis in electrical circuits provides vital insights into a circuit's behavior as the frequency of the input signal changes. The transfer function, a mathematical tool, is instrumental in understanding this behavior. It defines the relationship between phasor output and input and comes in four types: voltage gain, current gain, transfer impedance, and transfer admittance. The critical components of the transfer function are the poles and zeros.
561
01:16Characteristics of Practical Op Amps
790
A difference amplifier, a crucial component in numerous electronic devices, ideally amplifies only the difference-mode signal, which is the difference between two input signals. However, in practical circuits, the output voltage depends on both the differential gain and the common-mode gain.
The ratio of differential gain to the common-mode gain is defined as the common-mode rejection ratio (CMRR). This ratio quantifies the ability of operational amplifiers (op-amps) to reject common-mode...
The ratio of differential gain to the common-mode gain is defined as the common-mode rejection ratio (CMRR). This ratio quantifies the ability of operational amplifiers (op-amps) to reject common-mode...
790
01:26Scaling
504
In designing and analyzing filters, resonant circuits, or circuit analysis at large, working with standard element values like 1 ohm, 1 henry, or 1 farad can be convenient before scaling these values to more realistic figures. This approach is widely utilized by not employing realistic element values in numerous examples and problems; it simplifies mastering circuit analysis through convenient component values. The complexity of calculations is thereby reduced, with the understanding that...
504