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US 11,432,610 B2Granted
Active noise control in a helmet
AssigneeHarman Becker Automotive Systems GmbH
InventorMarkus Christoph
Life of this patent
Estimating the term…
Abstract
Exemplary noise reducing methods and systems are configured to acoustically reproduce two electrical noise reducing signals at two opposing positions in a helmet; to pick up sound at positions in the vicinity of the positions where the noise reducing signals are reproduced; and to generate the two noise reducing signals from error-signals and reference-signals. For each noise reducing signal, the corresponding error-signal is generated from the sound picked-up at the same position where the respective noise reducing signal is reproduced; and the reference-signal is generated from the sound picked-up at the position where the respective other noise reducing signal is reproduced.
Claims19
A noise reducing system comprising:
- a helmet;
- a first loudspeaker (FLspkr) disposed in the helmet at an opposing position from a second loudspeaker (FRspkr);
- a first microphone (FLMic) disposed in a vicinity of the first loudspeaker (FLspkr) and a second microphone (FRMic) disposed in a vicinity of the second loudspeaker (FRspkr);
- and
- an active noise controller including a processor and being operably coupled to the first loudspeaker (FLspkr), the second loudspeaker (FRspkr), the first microphone (FLMic), and the second microphone (FRMic) to perform active noise control;
- wherein a first magnitude frequency response is defined as being a product of a magnitude response of the first loudspeaker (FLspkr) and a magnitude response of the first microphone (FLMic);
- wherein a second magnitude frequency response is defined as being a product of the magnitude response of the first loudspeaker (FLspkr) and a magnitude response of the second microphone (FRMic);
- wherein the second magnitude frequency response is subtracted from the first magnitude frequency response to provide a third magnitude frequency response;
- wherein a fourth magnitude frequency response is defined as being a product of a magnitude response of the second loudspeaker (FRspkr) and the magnitude response of the second microphone (FRMic);
- wherein a fifth magnitude frequency response is defined as being a product of the magnitude response of the second loudspeaker (FRspkr) and the magnitude response of the first microphone (FLMic);
- wherein the fifth magnitude frequency response is subtracted from the fourth magnitude response to provide a sixth magnitude frequency response, and
- wherein the third magnitude frequency response at least partially overlaps with the sixth magnitude response when the active noise controller is activated.
9 more elements
A noise reducing method comprising:
- acoustically reproducing two electrical noise reducing signals at two opposing positions in a helmet with a first loudspeaker (FLspkr) and a second loudspeaker (FRspkr);
- and
- picking up sound at positions in a vicinity of where the noise reducing signals are reproduced with a first microphone (FLMic) and a second microphone (FRMic);
- wherein the first microphone (FLMic) and the second microphone (FRMic) are disposed inside the helmet such that the first microphone (FLMic) and the second microphone (FRMic) are arranged to face an opening of the helmet,
- wherein a first magnitude frequency response is defined as being a product of a magnitude response of the first loudspeaker (FLspkr) and a magnitude response of the first microphone (FLMic);
- wherein a second magnitude frequency response is defined as being a product of the magnitude response of the first loudspeaker (FLspkr) and a magnitude response of the second microphone (FRMic);
- wherein the second magnitude frequency response is subtracted from the first magnitude frequency response to provide a third magnitude frequency response;
- wherein a fourth magnitude frequency response is defined as being a product of a magnitude response of the second loudspeaker (FRspkr) and the magnitude response of the second microphone (FRMic);
- wherein a fifth magnitude frequency response is defined as being a product of the magnitude response of the second loudspeaker (FRspkr) and the magnitude response of the first microphone (FLMic);
- wherein the fifth magnitude frequency response is subtracted from the fourth magnitude response to provide a sixth magnitude frequency response, and
- wherein the third magnitude frequency response at least partially overlaps with the sixth magnitude response when the operation of acoustically reproducing two electrical noise reducing signals is activated.
8 more elements
A noise reducing system comprising:
- a helmet;
- a first loudspeaker (FLspkr) and a second loudspeaker (FRspkr), each of the first loudspeaker (FLspkr) and the second loudspeaker (FRspkr) are positioned in the helmet at opposing positions from one another;
- a first microphone (FLMic) disposed in a vicinity of the first loudspeaker (FLspkr);
- a second microphone (FRMic) disposed in a vicinity of the second loudspeaker (FRspkr);
- and
- an active noise controller including a processor and two channels each with an error-signal input, a reference-signal input and an output;
- wherein a first magnitude frequency response is defined as being a product of a magnitude response of the first loudspeaker (FLspkr) and a magnitude response of the first microphone (FLMic);
- wherein a second magnitude frequency response is defined as being a product of the magnitude response of the first loudspeaker (FLspkr) and a magnitude response of the second microphone (FRMic);
- wherein the second magnitude frequency response is subtracted from the first magnitude frequency response to provide a third magnitude frequency response;
- wherein a fourth magnitude frequency response is defined as being a product of a magnitude response of the second loudspeaker (FRspkr) and the magnitude response of the second microphone (FRMic);
- wherein a fifth magnitude frequency response is defined as being a product of the magnitude response of the second loudspeaker (FRspkr) and the magnitude response of the first microphone (FLmic);
- wherein the fifth magnitude frequency response is subtracted from the fourth magnitude response to provide a sixth magnitude frequency response, and
- wherein the third magnitude frequency response at least partially overlaps with the sixth magnitude response when the active noise controller is activated.
10 more elements
Dependencies are inferred from the claim text.