COORDINATED ANR REFERENCE SOUND COMPRESSION
First Claim
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1. A ANR circuit comprising:
- a first VGA to compress a feedforward reference sound represented by a signal output by a feedforward microphone detecting an external noise sound in an environment external to a casing as the feedforward reference sound;
a second VGA to compress a feedback reference sound represented by a signal output by a feedback microphone detecting a cavity noise sound within a cavity defined by the casing as the feedback reference sound;
at least one filter to generate a feedforward anti-noise sound from the feedforward reference sound;
at least another filter to generate a feedback anti-noise sound from the feedback reference sound; and
a compression controller coupled to the first and second VGAs to operate the first and second VGAs to coordinate compression of the feedforward and feedback reference sounds in response to the acoustic energy of the external noise sound reaching a first threshold.
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Abstract
Apparatus and method of an ANR circuit providing both feedforward-based and feedback-based ANR, possibly of a personal ANR device, compressing both feedforward and feedback reference sounds detected by feedforward and feedback microphones, respectively, in response to the acoustic energy of the feedforward reference noise sound reaching a predetermined level.
160 Citations
32 Claims
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1. A ANR circuit comprising:
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a first VGA to compress a feedforward reference sound represented by a signal output by a feedforward microphone detecting an external noise sound in an environment external to a casing as the feedforward reference sound; a second VGA to compress a feedback reference sound represented by a signal output by a feedback microphone detecting a cavity noise sound within a cavity defined by the casing as the feedback reference sound; at least one filter to generate a feedforward anti-noise sound from the feedforward reference sound; at least another filter to generate a feedback anti-noise sound from the feedback reference sound; and a compression controller coupled to the first and second VGAs to operate the first and second VGAs to coordinate compression of the feedforward and feedback reference sounds in response to the acoustic energy of the external noise sound reaching a first threshold. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A personal ANR device comprising:
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a first casing defining a first cavity structured to be acoustically coupled to a first ear canal of a first ear of a user of the personal ANR device; a first feedforward microphone carried by the first casing in a manner that acoustically couples the first feedforward microphone to an environment external to the first casing to detect a first external noise sound in the environment external to the first casing, and structured to output a signal representing the first external noise sound as a first feedforward reference sound; a first feedback microphone disposed within the first cavity to detect a cavity noise sound within the first cavity, and structured to output a signal representing the cavity noise sound as a first feedback reference sound; a first acoustic driver disposed within the first casing to acoustically output a first feedforward anti-noise sound and first feedback anti-noise sound into the first cavity; and a first ANR circuit coupled to the first feedforward microphone to receive the signal representing the first feedforward reference sound, coupled to the first feedback microphone to receive the signal the representing first feedback reference sound, and coupled to the first acoustic driver to drive the first acoustic driver to acoustically output the first feedforward and first feedback anti-noise sounds;
wherein the first ANR circuit is structured to generate the first feedforward anti-noise sound from the first feedforward reference sound, structured to generate the first feedback anti-noise sound from the first feedback reference sound, and structured to coordinate compression of the first feedforward and first feedback reference sounds in response to the acoustic energy of the first external noise sound reaching a first threshold. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
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25. A method comprising:
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employing an external noise sound detected in an environment external to a casing of a personal ANR device as a feedforward reference sound to generate a feedforward anti-noise sound; employing a cavity noise sound detected in a cavity defined by the casing and structured to be acoustically coupled to an ear canal as a feedback reference sound to generate a feedback anti-noise sound; acoustically outputting the feedforward and feedback anti-noise sounds into the cavity; and coordinating compression of the feedforward and feedback reference sounds in response to the acoustic energy of the external noise sound reaching a first threshold. - View Dependent Claims (26, 27, 28, 29, 30, 31, 32)
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Specification