Active noise control for a helmet

• US 10,796,681 B2
• Filed: 02/10/2016
• Issued: 10/06/2020
• Est. Priority Date: 02/13/2015
• Status: Active Grant

• Current Assignee: Harman Becker Automotive Systems GmbH (Samsung Group)
• Original Assignee: Harman Becker Automotive Systems GmbH (Samsung Group)
• Inventors: Zukowski, Paul, Pfaffinger, Gerhard
• Primary Examiner(s): San Martin, Edgardo
• Application Number:
  US15/550,728
• Publication Number:
  US 20180027917A1
• Time in Patent Office: 1,700 Days
• CPC Class Codes: A42B 3/30 Mounting radio sets or communication systems
• CPC Class Codes: A42B 3/303 Communication between riders or passengers
• CPC Class Codes: A42B 3/306 Audio entertainment systems
• CPC Class Codes: G06F 3/165 Management of the audio stream, e.g. setting of volume, audio stream path
• CPC Class Codes: G10K 11/17837 by retaining part of the ambient acoustic environment, e.g. speech or alarm signals that the user needs to hear
• CPC Class Codes: G10K 11/17854 the filter being an adaptive filter
• CPC Class Codes: G10K 11/17857 Geometric disposition, e.g. placement of microphones
• CPC Class Codes: G10K 11/17861 using additional means for damping sound, e.g. using sound absorbing panels
• CPC Class Codes: G10K 11/17881 the reference signal being an acoustic signal, e.g. recorded with a microphone
• CPC Class Codes: G10K 11/17885 additionally using a desired external signal, e.g. pass-through audio such as music or speech
• CPC Class Codes: G10K 15/02 Synthesis of acoustic waves synthesis of speech G10L13/00
• CPC Class Codes: G10K 2210/1081 Earphones, e.g. for telephones, ear protectors or headsets
• CPC Class Codes: G10K 2210/3044 Phase shift, e.g. complex envelope processing
• CPC Class Codes: G10K 2210/3046 Multiple acoustic inputs, multiple acoustic outputs
• CPC Class Codes: H04R 1/028 associated with devices performing functions other than acoustics, e.g. electric candles
• CPC Class Codes: H04R 1/1008 Earpieces of the supra-aural or circum-aural type
• CPC Class Codes: H04R 1/1041 Mechanical or electronic switches, or control elements switches in general H01H
• CPC Class Codes: H04R 1/1083 Reduction of ambient noise active noise reduction per se G10K11/175; protective devices for the ear, e.g. providing acoustic protection A61F11/06
• CPC Class Codes: H04R 2201/023 Transducers incorporated in garment, rucksacks or the like
• CPC Class Codes: H04R 2420/07 Applications of wireless loudspeakers or wireless microphones
• CPC Class Codes: H04R 2460/01 : Hearing devices using active noise cancellation
• CPC Class Codes: H04R 2460/07 : Use of position data from wide-area or local-area positioning systems in hearing devices, e.g. program or information selection
• CPC Class Codes: H04R 2499/13 : Acoustic transducers and sound field adaptation in vehicles

Abstract

An automatic noise control system and method for a helmet with a rigid shell that is configured to spatially divide a shell interior from a shell ambiance include generating in connection with at least one loudspeaker disposed in the shell interior anti-sound in the shell interior based on at least one input signal. The anti-sound is configured to attenuate sound occurring in the shell interior through destructive superposition. The system and method further include providing the at least one input signal by at least one of picking up sound in the vicinity of the loudspeaker in the shell interior, picking up vibrations of the shell, and picking up sound in the vicinity of the shell exterior.

Claims

1. An automatic noise control system comprising:

a helmet with a rigid shell configured to spatially divide a shell interior from a shell ambiance;

at least one loudspeaker disposed in the shell interior;

an active noise control processor configured to generate in connection with the at least one loudspeaker, anti-sound in the shell interior based on at least one input signal, the anti-sound configured to attenuate sound occurring in the shell interior through destructive superposition;

at least one sensor configured to provide the at least one input signal, the at least one sensor being at least one of an internal acoustic sensor, a non-acoustic sensor and an external acoustic sensor;

wherein;

the internal acoustic sensor is disposed in a vicinity of the at least one loudspeaker in the shell interior;

the non-acoustic sensor is mechanically or acoustically coupled to the shell; and

the external acoustic sensor is mechanically or acoustically coupled to the shell; and

an audio sound processor configured to receive or transmit audio signals via a data bus, wherein the audio signals are used for music or speech playback in the shell interior of the helmet.

2. The system of claim 1, further comprising at least one further internal acoustic sensor, wherein at least one of the internal acoustic sensor and the at least one further internal acoustic sensor is disposed around or in front of the at least one loudspeaker.

3. The system of claim 2, further comprising at least one combiner that couples the active noise control processor to the internal acoustic sensor and the at least one further internal acoustic sensor.

4. The system of claim 1, wherein:

the active noise control processor comprises a feedback structure or a combined feedforward-feedback structure;

the active noise control processor is configured to receive an error signal; and

at least one of the internal acoustic sensor, the at least one further internal acoustic sensor or the combiner are configured to provide the error signal.

5. The system of claim 1, wherein:

the active noise control processor comprises a feedforward structure or a combined feedforward-feedback structure;

the active noise control processor is configured to receive a reference signal; and

at least one of the non-acoustic sensor and the external acoustic sensor is configured to provide the reference signal.

6. The system of claim 1, wherein at least one of the internal acoustic sensor, at least one further internal acoustic sensor, and the external acoustic sensor is a microphone.

7. The system of claim 1, wherein the non-acoustic sensor is an acceleration sensor.

8. The system of claim 1, wherein the active noise control processor is further configured to receive and process at least one undesired-sound reference signal representative of sound generated by a vehicle.

9. The system of claim 8, further comprising a first signal synthesizer that is configured to synthesize the at least one undesired-sound reference signal from a signal representative of at least one operational characteristic of the vehicle.

10. The system of claim 1, wherein the active noise control processor comprises at least one of a fixed filter, a controllable filter, and an adaptive filter.

11. An automatic noise control method for a helmet with a rigid shell that is configured to spatially divide a shell interior from a shell ambiance;

the method comprising;

generating in connection with at least one loudspeaker disposed in the shell interior, anti-sound in the shell interior based on at least one input signal, the anti-sound configured to attenuate sound occurring in the shell interior through destructive superposition;

providing the at least one input signal by at least one of;

picking up sound in a vicinity of the at least one loudspeaker in the shell interior;

picking up vibrations of the shell; and

picking up sound in a vicinity of a shell exterior; and

receiving or transmitting audio signals at an audio signal processor via a data bus, wherein the audio signals are used for music or speech playback in the shell interior of the helmet.

12. The method of claim 11, further comprising picking up sound in the shell interior at at least one position around or in front of the at least one loudspeaker to provide a multiplicity of input signals to an active noise control processor.

13. The method of claim 12, further comprising combining the multiplicity of input signals corresponding to the picked-up sound in the shell interior at a multiplicity of positions around or in front of the at least one loudspeaker and providing at least one combined input signal.

14. The method of claim 12, wherein:

the active noise control processor comprises a feedback structure or a combined feedforward-feedback structure;

the active noise control processor is configured to receive an error signal; and

the error signal is provided by the at least one input signal corresponding to at least one of the picked up vibrations of the shell and the sound picked up in the vicinity of the shell exterior.

15. The method of claim 12, wherein:

the active noise control processor comprises a feedforward structure or a combined feedforward-feedback structure;

the active noise control processor is configured to receive a reference signal; and

the reference signal is provided by the at least one input signal corresponding to sound picked up in the vicinity of the at least one loudspeaker in the shell interior.

16. The method of claim 11, wherein at least one of picking up sound in the vicinity of the at least one loudspeaker in the shell interior and picking up sound in the vicinity of the shell exterior is performed using a microphone.

17. The method of claim 11, wherein picking up vibrations of the shell is performed using an acceleration sensor.

18. The method of claim 12 further comprising receiving and processing at least one undesired-sound reference signal representative of sound generated by a vehicle with the active noise control processor.

19. The method of claim 18, further comprising synthesizing the at least one undesired-sound reference signal from a signal representative of at least one operational characteristic of the vehicle.

20. The method of claim 12, wherein the active noise control processor comprises at least one of a fixed filter, a controllable filter, and an adaptive filter.

21. An automatic noise control system comprising:

a helmet including a rigid shell and having a shell interior;

at least one loudspeaker disposed in the shell interior;

an active noise control processor configured to generate in connection with the at least one loudspeaker, anti-sound in the shell interior based on at least one input signal, the anti-sound configured to attenuate sound that occurs in the shell interior through destructive superposition;

at least one sensor configured to provide the at least one input signal, the at least one sensor being at least one of an internal acoustic sensor, a non-acoustic sensor and an external acoustic sensor;

wherein;

the internal acoustic sensor is disposed in a vicinity of the at least one loudspeaker in the shell interior;

the non-acoustic sensor is mechanically or acoustically coupled to the shell; and

the external acoustic sensor is mechanically or acoustically coupled to the shell; and

an audio sound processor configured to receive or transmit audio signals via a data bus, wherein the audio signals are used for music or speech playback in the shell interior of the helmet.