Patent ID: 8948425
Filing Date: 2015-02-03
Classification: H04R

Abstract:
1. A method of fitting a hearing aid to a user based on microphone sensitivity and measured hearing level of the user, both with reference to the electrical output signal of the microphone or its equivalent, the method comprising: a) for a sound at a particular frequency and level, passing the electrical output of the microphone through an analog to digital converter, and measuring the output of the analog-to-digital converter to obtain a value for the output in ADC units to obtain the microphone sensitivity S, whereas ADC referring to analog to digital converter; b) measuring, for a particular frequency an in situ hearing level T in ADC units for a user, wherein the measuring is performed without the use of earphones, headphones, or loudspeakers: and c) determining for the user a gain, wherein the gain is calculated using the formula: Gain (G)=T/FS, where S is the measured free field sensitivity—of the microphone in ADC units/Pascal, or its equivalent, at the particular frequency, T is the in-situ hearing level and F is the desired free field sound pressure for a person with normal hearing to perceive a sound at the particular frequency.