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US 10,453,437 B2Granted
Sound reproduction with active noise control in a helmet
AssigneeHarman Becker Automotive Systems GmbH
InventorsMarkus Christoph, Paul Zukowski, Matthias Kronlachner
Life of this patent
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Abstract
An exemplary sound reproducing, noise reducing method and system include supplying to a corresponding loudspeaker a useful signal that represents sound to be reproduced and an anti-noise signal that, when reproduced by the corresponding loudspeaker, reduces noise in the vicinity of the corresponding microphone. The method and system further include receiving audio input signals and processing the audio input signals to provide the useful signals so that the useful signals provide a more realistic sound impression for a listener wearing the helmet than the audio input signals.
Claims19
A sound reproducing, noise reducing system comprising:
- a helmet comprising an outer shell;
- two loudspeakers disposed in the helmet at opposing positions from one another;
- two microphones disposed at positions in a vicinity of the two loudspeakers;
- two active noise control modules coupled to the two loudspeakers, the active noise control modules being configured to supply to a corresponding loudspeaker a useful signal that represents sound to be reproduced and an anti-noise signal that, when reproduced by the corresponding loudspeaker, reduces noise in the vicinity of the corresponding loudspeaker;
- and
- an audio signal enhancement module connected upstream of the active noise control modules, the audio signal enhancement module being configured to receive audio input signals and to process the audio input signals to provide the useful signals with at least one of a stereo widening functionality, a sound stage functionality, two-dimensional-audio, and three-dimensional audio, wherein
- the loudspeakers are disposed in ear-cups,
- and
- wherein a first active noise control module of the two active noise control modules includes:
- a first filter configured to filter the useful signal;
- and
- a second filter, positioned in series with the first filter, to filter an output of the first filter to generate a series filter output signal;
- and
- a first adder configured to add a first microphone signal provided by a microphone to the series filter output signal to provide a filter input signal to an active noise control filter that generates an error signal in response to the filter input signal.
11 more elements
A sound reproducing, noise reducing method comprising:
- supplying to a corresponding loudspeaker in a helmet, a useful signal that represents sound to be reproduced and an anti-noise signal that, when reproduced by the corresponding loudspeaker, reduces noise in a vicinity of the corresponding loudspeaker, wherein the loudspeaker is disposed in an ear-cup of a helmet, the helmet comprising an outer shell;
- receiving and processing audio input signals to provide the useful signals with at least one of a stereo widening functionality, a sound staging functionality, two-dimensional-audio, and three-dimensional audio;
- and
- filtering, via a first filter, the useful signal;
- filtering, via a second filter positioned in series with the first filter, an output of the first filter to generate a series filter output signal;
- and
- adding, via a first adder, a first microphone signal provided by a microphone to the series filter output signal to provide a filter input signal to an active noise control filter that generates an error signal in response to the filter input signal.
4 more elements
A sound reproducing, noise reducing system comprising:
- a helmet comprising an outer shell;
- two loudspeakers disposed in the helmet at opposing positions from one another;
- two microphones disposed at a position in a vicinity of the two loudspeakers;
- two active noise control modules coupled to the two loudspeakers, each active noise control modules being configured to supply to a corresponding loudspeaker a useful signal indicative of a sound to be reproduced and an anti-noise signal that, when reproduced by the corresponding loudspeaker, reduces noise in the vicinity of the corresponding loudspeaker;
- and
- an audio signal enhancement module being operatively coupled to the two active noise control modules, the audio signal enhancement module being configured to process audio input signals to provide the useful signals with at least one of a stereo widening functionality, a sound stage functionality, two-dimensional-audio, and three-dimensional audio, wherein
- the loudspeakers are disposed in ear-cups,
- and
- wherein a first active noise control module of the two active noise control modules includes:
- a first filter configured to filter the useful signal;
- and
- a second filter, positioned in series with the first filter, to filter an output of the first filter to generate a series filter output signal;
- and
- a first adder configured to add a first microphone signal provided by a microphone to the series filter output signal to provide a filter input signal to an active noise control filter that generates an error signal in response to the filter input signal.
11 more elements
Dependencies are inferred from the claim text.