Sound level control in responding to the estimated impedances indicating that the medium being an auditory canal and other than the auditory canal
First Claim
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1. A system, comprising:
- a transducer for converting an electrical signal driving the transducer into audible sound;
a phase estimator for estimating an acoustic impedance of a medium acoustically coupled to the transducer by estimating a phase difference between a voltage and a current of the electrical signal driving the transducer; and
a sound level control for;
in response to the estimated acoustic impedance indicating that the medium is an auditory canal, determining that the transducer is aligned with an ear, and protecting a user from an unsafe level of sound pressure by reducing a loudness of a sound produced by the transducer; and
, in response to the estimated acoustic impedance indicating that the medium is other than the auditory canal, determining that the transducer is spaced a safe, distance from the ear.
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Abstract
A system and method for controlling a sound level of a mobile audio device are disclosed herein. In accordance with at least some embodiments, a system includes a transducer, a phase estimator, and a sound level control. The transducer converts an electrical signal applied to the transducer into audible sound. The phase estimator estimates a phase difference between a voltage and a current of the electrical signal applied to the transducer. The sound level control controls the loudness of sound produced by the transducer based, at least in part on the estimated phase difference.
7 Citations
19 Claims
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1. A system, comprising:
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a transducer for converting an electrical signal driving the transducer into audible sound; a phase estimator for estimating an acoustic impedance of a medium acoustically coupled to the transducer by estimating a phase difference between a voltage and a current of the electrical signal driving the transducer; and a sound level control for;
in response to the estimated acoustic impedance indicating that the medium is an auditory canal, determining that the transducer is aligned with an ear, and protecting a user from an unsafe level of sound pressure by reducing a loudness of a sound produced by the transducer; and
, in response to the estimated acoustic impedance indicating that the medium is other than the auditory canal, determining that the transducer is spaced a safe, distance from the ear. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method performed by a control system, the method comprising:
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estimating an acoustic impedance of a medium acoustically coupled to a speaker by estimating a phase difference between a voltage and a current of an electrical signal driving the speaker; in response to the estimated acoustic impedance indicating that the medium is an auditory canal, determining that the speaker is aligned with an ear, and protecting a user from an unsafe level of sound pressure by reducing adjusting a loudness of a sound produced by the speaker; and in response to the estimated acoustic impedance indicating that the medium is other than the auditory canal, determining that the speaker is spaced a safe distance from the ear. - View Dependent Claims (10, 11, 12, 13, 14, 15)
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16. A mobile audio device, comprising:
an audio volume control system for;
estimating an acoustic impedance of a medium acoustically coupled to an audio speaker by estimating a phase difference between voltage and a current of an electrical signal driving the audio speaker;
in response to the estimated acoustic impedance indicating that the medium is an auditory canal, determining that the audio speaker is aligned with an ear, and protecting a user from an unsafe level of sound pressure by reducing an audio output volume of the audio speaker; and
, in response to the estimated acoustic impedance indicating that the medium is other than the auditory canal, determining that the audio speaker is spaced a safe distance from the ear.- View Dependent Claims (17, 18, 19)
Specification