Compression for Clinicians
Written in an easy-to-read style that is especially accessible for the busy clinician who is bombarded by many new terms and concepts Provides short synopsis of outer and inner hair cell function, as it specifically relates to an increasingly common type of compression: wide dynamic range compression (WDRC) Describes clearly the more popular threshold-based and suprathreshold-based hearing aid fitting methods Offers concise explanation of the many different types of compression in hearing aids
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WHY SO MANY DIFFERENT HEARING AID FITTING
Evolution of Hearing Aid Fitting Methods
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adjusted aid fitting methods analog audible audiogram average background noise basilar membrane channel Chapter class A amplifier client clinicians cochlea compression hearing aids compression kneepoint compression ratio dB HL dB SPL digital hearing aids directional microphone DSP hearing aids dynamic range compression Fig6 Figure fitting methods frequency response gain for soft hearing aid fitting Hearing Journal high frequencies IHAFF IHCs incoming sounds input compression input levels input SPLs input/output input/output graphs insertion gain intense sounds Killion kneepoint of compression linear hearing aids listening loudness tolerance low frequencies low-frequency mild-to-moderate SNHL multichannel hearing aids normal hearing normal loudness growth numbers OHCs outer hair cells output compression output limiting compression presbycusis pression programmable hearing aids quency real ear restore normal loudness scala scala media sensorineural hearing loss shows single-channel soft sounds Sound FX TK control traveling wave trimmer settings types of compression volume control WDRC hearing aid