Patent ID: 8917880
Filing Date: 2014-12-23
Classification: A61B,G01H

Abstract:
1. A method of operating an audio device having an ear canal receiver (ECR) capable of operating in an ECR or ear canal microphone (ECM) mode comprising: calculating estimated sound pressure levels (SPL1) for drive signals directed to the ECR during a time increment Δt, when the ECR is in the ECR mode; predicting a sound pressure level (PSPL1) for ambient acoustic signals that would be received by the ECR during the time increment Δt, if the ECR was in the ECM mode but is in ECR mode; calculating an estimated SPL_Dose during the time increment Δt as a function of SPL1 and PSPL1; and calculating a total SPL_Dose of the audio device at a time t using the estimated SPL_Dose.