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General Description of Hearing Aids
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2cc coupler amplitude ANSI audio auditory training systems basic battery behind-the-ear carrier wave cavity characteristics circuit coil components compression condenser microphone cord dB input dB SPL decibel device diameter diaphragm difference discharge dynes/cm ear canal ear-level earmold earphone effect electret electrical electrode electrolyte electromagnetic induction energy feedback Figure frequency range frequency response frequency response curve function gain control HAIC harmonic distortion hearing aid performance high frequency impedance increase induction loop input level input signal insert instrument limiting linear logarithmic low frequency magnetic field measured modulation monaural noise nonlinear occurs open canal operating output peak clipping percent position primary peak ratio receiver rechargeable Reference Test Gain saturation shows silver oxide soldering sound bore sound intensities sound pressure level specific speech SSPL telephone temperature tion tone total harmonic distortion transistor tubing vent voltage volume control watts/cm wire zinc