METHOD AND SYSTEM FOR LIMITING AUDIO OUTPUT IN AUDIO HEADSETS

• US 20090315708A1
• Filed: 08/15/2008
• Published: 12/24/2009
• Est. Priority Date: 06/19/2008
• Status: Abandoned Application

• Current Assignee: Avago Technologies General IP PTE Limited (Broadcom, Inc.)
• Original Assignee: Avago Technologies General IP PTE Limited (Broadcom, Inc.)
• Inventors: Walley, John, Pandula, Louis
• Application Number:
  US12/192,965
• Publication Number:
  US 20090315708A1
• Time in Patent Office: Days
• US Class Current: 340/540
• CPC Class Codes: H03G 7/08 incorporating negative feedback

Abstract

Aspects of a method and system for limiting an audio signal output in an audio device are provided. An exposure meter may provide measurements of SPL values of the audio signal. When a volume or exposure level of the audio signal may approach or exceed a specified limit, the audio signal may be enforced to a predetermined limit. The audio signal may be an input or an output signal of a speaker of an audio device such as a stereo headset. A trend of the measured SPL values may be predicted based on the measured SPL values and device specific reference SPL values. When the volume or exposure level of the audio signal may not be within the specified limit, the audio signal may be limited and an alarm may be sent out to listener. A set of audio volume level parameters may be determined and applied, accordingly.

Claims

1. A method for processing audio signals, the method comprising:

measuring a sound pressure level of an audio signal; and

limiting said audio signal when a volume level indicated by said measured sound pressure level is not within a specified limit.

2. The method according to claim 1, wherein said audio signal is generated from a speaker.

3. The method according to claim 1, wherein said audio signal is an input signal to a speaker.

4. The method according to claim 1, comprising predicting a trend of speaker characteristics based on said measured sound pressure level.

5. The method according to claim 4, comprising adjusting a gain of an equalizer that controls said volume level of said audio signal based on said predicted trend of speaker characteristics while limiting said audio signal.

6. The method according to claim 1, comprising adjusting one or more frequency components of said audio signal while limiting said audio signal.

7. The method according to claim 1, comprising determining whether an exposure level of said volume level of said audio signal is within said specified limit.

8. The method according to claim 1, comprising communicating an alarm signal or alert when said volume level of said audio signal is not within said specified limit.

9. The method according to claim 8, wherein said alarm signal or alert is an audio and/or visual alert.

10. A system for processing audio signals, the system comprising:

one or more circuits that measures a sound pressure level of an audio signal; and

said one or more circuits limits said audio signal when a volume level indicated by said measured sound pressure level is not within a specified limit.

11. The system according to claim 10, wherein said audio signal is generated from a speaker.

12. The system according to claim 10, wherein said audio signal is an input signal to a speaker.

13. The system according to claim 10, wherein said one or more circuits are enabled to predict a trend of speaker characteristics based on said measured sound pressure level.

14. The system according to claim 10, wherein said one or more circuits are enabled to adjust a gain of an equalizer that controls said volume level of said audio signal based on said predicted trend of speaker characteristics while limiting said audio signal.

15. The system according to claim 10, wherein said one or more circuits are enabled to adjust one or more frequency components of said audio signal while limiting said audio signal.

16. The system according to claim 10, wherein said one or more circuits are enabled to determine whether an exposure level of said volume level of said audio signal is within a specified limit

17. The system according to claim 16, wherein said one or more circuits are enabled to send out an alarm signal comprising an audio and/or visual alert when said volume level of said audio signal is not within said specified limit.

18. A machine-readable storage having stored thereon, a computer program having at least one code section for processing audio signals, the at least one code section being executable by a machine for causing the machine to perform steps comprising:

measuring a sound pressure level of an audio signal; and

limiting said audio signal when a volume level is not within a specified limit.

19. The machine-readable storage according to claim 18, wherein said audio signal is generated from a speaker.

20. The machine-readable storage according to claim 18, wherein said audio signal is an input signal to a speaker.

21. The machine-readable storage according to claim 18, wherein said at least one code section comprises code for predicting a trend of speaker characteristics based on said measured sound pressure level.

22. The machine-readable storage according to claim 21, wherein said at least one code section comprises code for adjusting a gain of an equalizer that controls said volume level of said audio signal based on said predicted trend of speaker characteristics while limiting said audio signal.

23. The machine-readable storage according to claim 21, wherein said at least one code section comprises code for adjusting one or more frequency components of said audio signal while limiting said audio signal.

24. The machine-readable storage according to claim 21, wherein said at least one code section comprises code for determining whether an exposure level of said volume level of said audio signal is within a specified limit.

25. The machine-readable storage according to claim 21, wherein said at least one code section comprises code for sending out an alarm signal when said volume level of said audio signal is not within said specified limit.