System and method for adaptive power control

• US 8,849,231 B1
• Filed: 08/08/2008
• Issued: 09/30/2014
• Est. Priority Date: 08/08/2007
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd. (Samsung Group)
• Original Assignee: Audience Corporation
• Inventors: Murgia, Carlo, Klein, David, Afshar, Alex
• Primary Examiner(s): Chen, Junpeng
• Application Number:
  US12/228,034
• Time in Patent Office: 2,244 Days
• Field of Search: 455/13.4, 455/522, 455572-574, 4551271-1275, 4553431-3436, 455/67.13, 455/296, 381/92, 381/71.1, 381/58, 381 941- 947, 381/94.2, 381/94, 370/311, 375/346, 379/406.03, 379/406.04, 704/225, 704/227
• US Class Current: 455/296
• CPC Class Codes: H04M 1/73 Battery saving arrangements
• CPC Class Codes: H04M 3/18 with means for reducing interference or noise; with means for reducing effects due to line faults with means for protecting lines
• CPC Class Codes: H04R 2410/05 Noise reduction with a separate noise microphone
• CPC Class Codes: H04R 3/005 for combining the signals of two or more microphones specially adapted for hearing aids H04R25/407
• CPC Class Codes: H04W 52/0238 where the received signal is an unwanted signal, e.g. interference or idle signal
• CPC Class Codes: Y02D 30/70 in wireless communication networks

Abstract

Systems and methods for adaptive power control are provided. In exemplary embodiments, a primary signal is received. A noise power level of the primary signal is then estimated. The noise power level may then be compared to at least one power threshold. Subsequently, a large power consuming system is controlled based on the comparison of the noise power level to the power threshold.

Claims

1. A method for providing adaptive power control, comprising:

receiving a primary acoustic signal having a plurality of components including a noise component, the primary acoustic signal representing at least one captured sound;

performing frequency analysis on the primary acoustic signal to generate a plurality of frequency sub-bands;

estimating a power level of the noise component of the primary acoustic signal, the estimating of the power level occurring in at least one frequency sub-band of the primary acoustic signal, the estimating of the power level comprising tracking the energy of the at least one frequency sub-band of the primary acoustic signal;

comparing the power level to at least one noise threshold; and

controlling a noise suppression system based on the comparison of the power level to the at least one noise threshold, wherein the noise suppression system is configured to be powered on and off based on the comparison;

wherein controlling the noise suppression system comprises providing continuity in an output signal when the noise suppression system is powered on or off by preserving a non-zero latency introduced by the noise suppression system.

2. The method of claim 1 further comprising receiving a secondary signal, the secondary signal being used by the noise suppression system for noise suppression processing.

3. The method of claim 1 wherein the estimating of the power level further comprises utilizing a minimum statistics tracker to track a minimum energy of the primary acoustic signal.

4. The method of claim 1 wherein the estimating of the power level further comprises smoothing a noise power level.

5. The method of claim 1 wherein the at least one noise threshold comprises an activation power threshold and a deactivation power threshold.

6. The method of claim 5 further comprising setting the activation power threshold at a higher value than the deactivation power threshold.

7. The method of claim 1 wherein the controlling of the noise suppression system further comprises generating a control signal to power on the noise suppression system or power off the noise suppression system.

8. The method of claim 1 wherein the power level comprises a noise level.

9. A system for providing adaptive power control, comprising:

a sensor configured to receive a primary acoustic signal having a plurality of components including a noise component, the primary acoustic signal representing at least one captured sound;

a frequency analysis module configured to perform frequency analysis on the primary acoustic signal to generate a plurality of frequency sub-bands;

a power level estimate module configured to estimate a power level of the noise component of the primary acoustic signal, the estimating of the power level occurring in at least one frequency sub-band of the primary acoustic signal, the power level estimate module tracking the energy of the at least one frequency sub-band of the primary acoustic signal;

an analysis module configured to compare the power level to at least one power threshold; and

a bypass engine configured to control a noise suppression system based on a result from the analysis module, wherein the noise suppression system is configured to be powered on and off based on the comparison;

wherein controlling the noise suppression system comprises providing continuity in an output signal when the noise suppression system is powered on or off by preserving a non-zero latency introduced by the noise suppression system.

10. The system of claim 9 further comprising a control signal generator configured to generate a control signal provided to the bypass engine.

11. The system of claim 9 wherein the power level estimate module comprises a leaky integrator.

12. The system of claim 9 further comprising a secondary sensor configured to receive a secondary signal, the secondary signal being used by the noise suppression system for noise suppression processing.

13. The system of claim 9 wherein the bypass engine comprises a switch configured to power on the noise suppression system or power off the noise suppression system.

14. The system of claim 9 wherein the power level comprises a noise level.

15. A non-transitory machine readable medium having embodied thereon a program, the program providing instructions for a method for providing adaptive power control, the method comprising:

receiving a primary acoustic signal having a plurality of components including a noise component, the primary acoustic signal representing at least one captured sound;

performing frequency analysis on the primary acoustic signal to generate a plurality of frequency sub-bands;

estimating a power level of the noise component of the primary acoustic signal, the estimating of the power level occurring in at least one frequency sub-band of the primary acoustic signal, the estimating of the power level comprising tracking the energy of the at least one frequency sub-band of the primary acoustic signal;

comparing the power level to at least one power threshold; and

controlling a noise suppression system based on the comparison of the power level to the at least one power threshold, wherein the noise suppression system is configured to be powered on and off based on the comparison;

wherein controlling the noise suppression system comprises providing continuity in an output signal when the noise suppression system is powered on or off by preserving a non-zero latency introduced by the noise suppression system.