Camera having audio noise attenuation capability

• US 20040032509A1
• Filed: 08/15/2002
• Published: 02/19/2004
• Est. Priority Date: 08/15/2002
• Status: Abandoned Application

• Current Assignee: Hewlett-Packard Development Company, L.P. (HP Inc.)
• Original Assignee: Hewlett-Packard Development Company, L.P. (HP Inc.)
• Inventors: Owens, James W., Goris, Andrew C.
• Application Number:
  US10/222,292
• Publication Number:
  US 20040032509A1
• Time in Patent Office: Days
• US Class Current: 348/222.1
• CPC Class Codes: H04N 5/21 Circuitry for suppressing or minimising disturbance, e.g. moiré or halo
• CPC Class Codes: H04N 5/60 for the sound signals
• CPC Class Codes: H04N 5/772 the recording apparatus and the television camera being placed in the same enclosure
• CPC Class Codes: H04N 5/907 using static stores, e.g. storage tubes or semiconductor memories H04N5/91 takes precedence
• CPC Class Codes: H04N 5/9267 using time division multiplex of the PCM audio and PCM video signals

Abstract

A camera having audio noise attenuation capability is disclosed. In one embodiment, the camera comprises a microphone and an audio noise attenuation system configured to attenuate undesired noise captured by the microphone when recording audio. In some embodiments, the audio noise attenuation system facilitates attenuation of noise generated by a motor of the camera. In other embodiments, the noise attenuation system generation facilitates attenuation of audio noise from the environment in which the camera is used.

Claims

1. A camera, comprising:

a microphone; and

an audio noise attenuation system configured to attenuate undesired audio noise captured by the microphone when recording audio.

2. The camera of claim 1, wherein the audio noise attenuation system comprises an audio noise filter.

3. The camera of claim 2, wherein the noise filter is a notch filter.

4. The camera of claim 2, wherein the noise filter is configured to filter frequencies associated with an audio signature of a camera motor.

5. The camera of claim 2, wherein the noise filter is configured to filter frequencies associated with environmental noise.

6. The camera of claim 2, wherein the noise attenuation system is configured to adjust the noise filter in relation to an estimation of noise filtration error.

7. The camera of claim 6, wherein the noise attenuation system comprises a least-mean-square (LMS) algorithm that is used to adjust the noise filter.

8. A digital camera capable of recording audio, comprising:

a lens system;

an image sensor configured to sense objects viewed with the lens system;

a motor that generates noise;

a microphone;

a control interface configured to control operation of the motor and the microphone;

a processor configured to receive image data from the image sensor and audio data from the microphone; and

memory comprising a noise attenuation system including a noise filter that is configured to attenuate the noise generated by the motor.

9. The digital camera of claim 8, wherein the noise filter comprises a notch filter.

10. The digital camera of claim 8, wherein the noise attenuation system is configured to facilitate capture of an audio signature of the motor and wherein the noise filter is specifically configured to attenuate frequencies of the audio signature.

11. The digital camera of claim 8, wherein the noise attenuation system is configured to facilitate capture of environmental noise and wherein the noise filter is configured to attenuate frequencies of the environmental noise.

12. The digital camera of claim 8, wherein the noise attenuation system is configured to adjust the noise filter in relation to an estimation of noise filtration error.

13. The digital camera of claim 12, wherein the noise attenuation system comprises a least-mean-square (LMS) algorithm that is used to adjust the noise filter.

14. A method for attenuating noise in a digital still camera, the method comprising:

operating a motor of the camera;

capturing an audio signature of the motor while it operates;

generating a noise filter configured to attenuate frequencies of the audio signature; and

applying the noise filter to audio recorded during operation of the motor.

15. The method of claim 14, wherein the step of operating a motor comprises operating one of a focusing motor and a zoom motor.

16. The method of claim 14, wherein the step of capturing an audio signature comprises capturing an audio signature with an integral microphone of the camera.

17. The method of claim 14, further comprising adjusting the noise filter to provide adaptive filtering.

18. The method of claim 17, wherein the step of adjusting the noise filter comprises adjusting the noise filter using a least-mean-square (LMS) algorithm.

19. A system for attenuating noise in a digital still camera, the system comprising:

means for operating a motor of the camera and simultaneously capturing an audio signature of the motor;

means for generating a filter configured to attenuate frequencies of the audio signature; and

means for applying the noise filter to audio recorded during motor operation so as to attenuate the frequencies of the audio signature.

20. The system of claim 19, wherein the means for generating a filter comprise a noise attenuation system stored within camera memory.

21. The system of claim 20, wherein the noise attenuation system comprises means for adjusting the noise filter.

22. The system of claim 21, wherein the means for adjusting the noise filter comprise a least-mean-square (LMS) algorithm.

23. A noise attenuation system stored on a computer-readable medium, comprising:

logic configured to facilitate operation of a camera motor;

logic configured to facilitate capture of an audio signature of the motor; and

logic configured to generate a noise filter that attenuates frequencies of the audio signature.

24. The system of claim 23, further comprising logic configured to apply the generated noise filter to recorded audio during motor operation to attenuate frequencies associated with the audio signature of the motor.

25. The system of claim 23, further comprising logic configured to adjust the noise filter.

26. The system of claim 25, wherein the logic configured to adjust the noise filter comprises a least-mean-square (LMS) algorithm.