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What is Signal-to-noise ratio (SNR)

Chapter 4
Tele-Audiology and the Optimization of Hearing Healthcare Delivery
A measure that compares the level of a desired signal to the level of background noise. SNR is defined as the ratio of signal power to the noise power, often expressed in decibels.
Published in Chapter:
The Expected Benefit of Hearing Aids in Quiet as a Function of Hearing Thresholds
Peter J. Blamey (Blamey Saunders Hears, Australia)
Copyright: © 2019 |Pages: 23
DOI: 10.4018/978-1-5225-8191-8.ch004
Abstract
This chapter aimed to estimate speech perception benefits in quiet for clients with different degrees of hearing loss. The difference between aided and unaided scores on a monosyllabic word test presented binaurally was used as the measure of benefit. Retrospective data for 492 hearing aid users with four-frequency pure-tone average hearing losses (PTA) ranging from 5 dB HL to 76 dB HL in the better ear were analyzed using nonlinear regression. The mean benefit for the perception of monosyllabic words in this group of clients was 22.3% and the maximum expected benefit was 33.6% for a PTA of 52 dB HL. The expected benefit can be expressed as a reduction of the error rate by about half for isolated words and about one quarter for sentences across the full range of PTA.
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Chapter 32
Spatial Authentication Using Cell Phones
Signal-to-noise ratio is an electrical engineering concept defined as the ratio of a signal power to the noise power corrupting the signal.
Published in Chapter: Spatial Authentication Using Cell Phones; From: Handbook of Research on Information Security and Assurance
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Chapter 17
Using Hearing Assistance Technology to Improve School Success for All Children
A measure of signal strength relative to background noise. The ratio is usually measured in decibels (dB).
Published in Chapter: Using Hearing Assistance Technology to Improve School Success for All Children; From: Handbook of Research on Transformative Digital Content and Learning Technologies
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Chapter 8
Spectral Sensing Performance for Feature-Based Signal Detection with Imperfect Training
In the context of cognitive radios, this is the ratio between the primary user’s signal power as observed by the cognitive radio’s receive antenna during spectrum sensing, and the noise power similarly observed, within a defined frequency band.
Published in Chapter: Spectral Sensing Performance for Feature-Based Signal Detection with Imperfect Training; From: Handbook of Research on Software-Defined and Cognitive Radio Technologies for Dynamic Spectrum Management
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