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US 2011/0235813 A1Published application
Adapted Audio Masking
AssigneeBose Corporation
InventorDaniel M. Gauger, JR.
Life of this patent
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Abstract
Ambient sound is masked by receiving an audio signal, monitoring an acoustic signal that includes components of both the ambient sound the audio signal, determining a sound level sufficient to at least partially mask the ambient sound, and reproducing the received audio signal to produce an output acoustic signal at the determined sound level.
Claims24
A method for masking ambient sound, comprising:
- receiving an audio signal;
- monitoring an acoustic signal that includes components of both the ambient sound and the audio signal;
- determining a sound level sufficient to at least partially mask the ambient sound;
- amplifying the received audio signal to a level sufficient to produce an output acoustic signal at the determined sound level;
- and
- reproducing the amplified audio signal with an electroacoustic transducer.
3 more elements
The method of 1 wherein receiving the audio signal comprises generating the audio signal.
An audio reproduction system comprising:
- a first microphone input inside an earpiece of a set of headphones;
- an variable gain amplifier having an input for receiving an audio signal and an output;
- an electroacoustic transducer coupled to the output of the amplifier;
- a first band pass filter coupled to the microphone input;
- a first envelope detector coupled to an output of the first band pass filter;
- a second band pass filter coupled to a source of a comparison signal;
- a second envelope detector coupled to an output of the second band pass filter;
- and
- a correlator coupled to outputs of the first and second envelope detectors to output a value of a correlation between the outputs of the first and second envelope detectors;
- wherein the gain of the variable gain amplifier is influenced by a difference between an output of the correlator and a target correlation value.
7 more elements
Dependencies are inferred from the claim text.