Granted Patent B2

US 8,917,876 · App. 11/763,281 · Granted Dec 23, 2014

Abstract

Claims (26)

1. A SPL monitoring system comprising:

an audio transducer, where the audio transducer is configured to receive sound pressure, and where the audio transducer outputs a plurality of electronic signals, where each electronic signal represents a sound pressure level (SPL) for a particular frequency band;

a logic circuit, where time is broken into increments of time, where the logic circuit measures and stores in a memory storage system an exposure time duration when the SPL of the respective electronic signal exceeds a threshold value for the particular frequency band of the electronic signal and stores the SPL associated with each increment of time in the exposure time duration, and where the logic circuit measures and stores a recovery time duration when the SPL of the respective electronic signal drops below the threshold value for the particular frequency band of the electronic signal and stores the SPL associated with each increment of time in the recovery time duration, where the logic circuit calculates over an averaging time interval an average SPL dose within the averaging time interval, and where the logic circuit calculates a safe time duration over which a user can receive current sound pressure values; and

an indicator element, where the indicator element produces a notification when an indicator level occurs, where the indicator level is at least one of:

when the safe time duration has been exceeded;

when a listening duration is within a certain percentage range of the safe time duration;

when the listening duration is within various levels, where each level is represented by an indicator color and where each level represents a percentage range of the safe time duration;

when a power is low; and

when at least one feature is not working.

2. The SPL monitoring system according to claim 1 , where the indicator element is an audio warning sound source.

3. The SPL monitoring system according to claim 2 , where the audio warning sound source is at least one of:

a speech synthesis system that generates spoken messages indicating a remaining listening duration deemed safe by the SPL monitoring system;

a sample playback system that produces a pre-recorded alert signal or a spoken message indicating the remaining listening duration deemed safe by the SPL monitoring system, or some related information to the remaining listening duration deemed safe by the SPL monitoring system; and

a synthesis system that produces an alert signal relating to the remaining listening duration deemed safe by the SPL monitoring system.

4. The SPL monitoring system according to claim 1 , where the indicator element is a display system.

5. The SPL monitoring system according to claim 4 , where the display system is at least one of:

configured to indicate a level of listener noise exposure and an amount of listening time left before potential hearing damage;

a color-coded indicator patch; and

a light emitting diode display.

6. The SPL monitoring system according to claim 1 , where various indicator levels to be used are stored in a memory storage device.

7. The SPL monitoring system according to claim 6 , further including a software system configured to cause a computer to receive and store the indicator levels in the memory storage device.

8. The SPL monitoring system according to claim 1 further comprising a speaker, which directs output audio signals to an ear canal.

9. The SPL monitoring system according to claim 1 , further comprising a speaker, which directs output audio signals to an ear canal, where when the notification occurs, at least one of the following occurs:

an audio warning signal occurs;

a visual display is updated with a warning message; and

the speaker attenuates the output audio signal.

Assignments (13)