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US 2007/0177744 A1Published application
Automatic volume limiter for portable audio devices
OwnerLarry Kirninventor
Life of this patent
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Abstract
A proximity detector on an audio device to limits the output level when a person's head is detected nearby. Although other detection schemes are anticipated, such a proximity detector may rely upon optical, acoustic, or radio-frequency energy.
Claims5
Automatic sound level control apparatus, comprising:
- an audio source having a speaker for outputting sound;
- one or more devices for detecting the distance from the speaker to a listener;
- and
- circuitry for controlling the volume through the speaker as a function of the distance.
1 more element
Dependencies are inferred from the claim text.