Earhealth monitoring system and method I
View Patent ↗Methods of operating an audio device are provided. A method includes calculating estimated sound pressure levels (SPLs) for drive signals directed to an ear canal receiver (ECR) during a time increment Δt; calculating an estimated SPL_Dose during the time increment Δt using the estimated sound pressure levels; and calculating a total SPL_Dose at a time t of the audio device using the estimated SPL_Dose.
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.
2. The method according to claim 1 , further comprising:
measuring sound pressure levels (SPL2) for ambient acoustic signals received by the ECR during the time increment Δt, when the ECR is in the ECM mode.
3. The method according to claim 2 , further including:
calculating an SPL total during the time increment Δt using SPL1 and PSPL1, when the ECR is in the ECR mode.
4. The method according to claim 3 , where if the ECR is in the ECM mode during the time increment Δt, then SPL total during the time increment Δt is calculated using SPL2.
5. The method according to claim 4 , further comprising:
comparing the SPL total to a permissible sound level (PSL), and if SPL total is less than PSL within an error margin, then the step of calculating an estimated SPL_Dose uses a recovery function to calculate the estimated SPL_Dose during the time increment Δt.
6. The method according to claim 5 , where the error margin is zero.
7. The method according to claim 2 , further comprising:
generating a PSPL(t) equation valid over an update time period using at least two measured SPL2 values within an update time period.
8. The method according to claim 7 , where the values from the PSPL(t) equation during the time increment Δt are used in place of PSPL1 in calculating SPL total.
9. The method according to claim 5 , further comprising:
comparing the total SPL_Dose to a threshold value and if the total SPL_Dose is greater than the threshold value then an action parameter is read from readable memory.
10. The method according to claim 9 further comprising:
performing an action associated with the action parameter, where the action is at least one of modifying the operation of the audio device, modifying the drive signals directed to the ECR, and sending an acoustic notification signal to a user.
11. A method of operating an audio device comprising:
calculating estimated sound pressure levels (SPL1) for drive signals directed to an ear canal receiver (ECR) during a time increment Δt, when the ECR is in an ECR mode;
measuring sound pressure levels (SPL2) for ambient acoustic signals received by the ECR during the time increment Δt, when the ECR is in the ear canal microphone (ECM) 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 the ECR mode;
calculating an SPL total during the time increment Δt using SPL1 and PSPL1 when the ECR is in the ECR mode, if the ECR is in the ECM mode during the time increment Δt then SPL total during the time increment Δt is calculated using SPL2;
calculating an estimated SPL_Dose during the time increment Δt using SPL1 and PSPL1 when the ECR is in ECR mode and SPL2 when ECR is in ECM mode;
comparing the SPL total to a permissible sound level (PSL), and if SPL total is less than PSL then the step of calculating an estimated SPL_Dose uses a recovery function that is at least one of a linear function and an exponential function to calculate the estimated SPL_Dose during the time increment Δt; and
calculating a total SPL_Dose of the audio device at a time t using the estimated SPL_Dose, where t=t 0 +Δt, where t 0 is the time at the beginning of the time increment Δt.
12. The method according to claim 11 , where the step of predicting a sound pressure level (PSPL1) for ambient acoustic signals uses at least one preceding SPL2 value before t 0 , and at least one trailing value of SPL2 after t.
13. The method according to claim 12 , where the value(s) of PSPL1 is calculated by one of the following, a constant based on an average value of the preceding SPL2 value and the trailing SPL2 value, a linear function in time based on the preceding SPL2 value and the trailing SPL2 value, and a nonlinear function in time based on the preceding SPL2 value and the trailing SPL2 value.