ADJUSTED NOISE SUPPRESSION AND VOICE ACTIVITY DETECTION

• US 20130196715A1
• Filed: 01/30/2012
• Published: 08/01/2013
• Est. Priority Date: 01/30/2012
• Status: Active Grant

• Current Assignee: Malikie Innovations Limited (Key Patent Innovations Limited)
• Original Assignee: Blackberry Limited
• Inventors: Hansson, Per Magnus Fredrik, Moquin, Philippe Gilbert Jacques Joseph
• Granted Patent: US 8,831,686 B2
• Time in Patent Office: Days
• US Class Current: 455/563
• CPC Class Codes: G10L 21/0208 Noise filtering
• CPC Class Codes: G10L 25/78 Detection of presence or absence of voice signals switching of direction of transmission by voice frequency in two-way loud-speaking telephone systems H04M9/10
• CPC Class Codes: H04M 1/19 Arrangements of transmitters, receivers, or complete sets to prevent eavesdropping, to attenuate local noise or to prevent undesired transmission; Mouthpieces or receivers specially adapted therefor circuit arrangements for preventing eavesdropping H04M1/68; telephone cabinets E04H1/14
• CPC Class Codes: H04M 2250/12 including a sensor for measuring a physical value, e.g. temperature or motion telephones including GPS signal receivers H04M2250/10

Abstract

Dual microphones can be used to improve noise suppression by better distinguishing between speech and background noise. If the user does not hold the handset according to a prescribed orientation, however, the dual microphone noise suppression can actually do a worse job than a single microphone noise suppression algorithm because of mistakes made distinguishing between speech and noise. Here it is proposed to use an accelerometer to determine the orientation of the phone and use this orientation information in the noise suppression algorithm. Also when a person speaks, the vibrations when the device is held against the head can be used to detect speech.

Claims

1. A method of adjusting a noise suppression algorithm in a mobile communication device, the method comprising:

receiving input related to vibration of the mobile communication device from an accelerometer;

processing the input from the accelerometer;

adjusting, based on the input, a noise suppression algorithm, thereby producing an adjusted noise suppression algorithm;

receiving audio signals;

performing the adjusted noise suppression algorithm on the audio signals, thereby producing noise suppressed audio signals, wherein the processing relates to determining a likelihood of a presence of a voice signal in the audio signals; and

transmitting the noise suppressed audio signals.

2. The method of claim 1 wherein the input from the accelerometer is generated, at the accelerometer, as a function of orientation of the mobile communication device.

3. The method of claim 2 wherein the orientation of the mobile communication device comprises a position of the mobile communication device.

4. The method of claim 2 wherein the orientation of the mobile communication device comprises motion of the mobile communication device.

5. The method of claim 2 wherein the orientation of the mobile communication device comprises a change in position of the mobile communication device.

6. The method of claim 2 wherein the orientation of the mobile communication device comprises a change in motion of the mobile communication device.

7. The method of claim 1 wherein the processing comprises determining an approximate distance between a microphone of the mobile communication device and a mouth of a user.

8. The method of claim 7 wherein the adjusting the noise suppression algorithm comprises employing the distance.

10. The method of claim 1 wherein the received audio signals are received by a microphone of the mobile communication device.

11. The method of claim 10 wherein, upon determining likely presence of a voice signal in the audio signal, adjusting the noise suppression algorithm to reflect a presence of a voice signal.

12. The method of claim 10 wherein, upon determining unlikely presence of a voice signal in the audio signal, adjusting the noise suppression algorithm to reflect an absence of a voice signal.

9. (canceled)

13. A mobile communication device comprising:

an accelerometer;

a communication subsystem;

a processor adapted to;

receive input related to vibration of the mobile communication device from the accelerometer;

process the input from the accelerometer;

adjust, based on the input, a noise suppression algorithm, thereby producing an adjusted noise suppression algorithm;

receive audio signals;

perform the adjusted noise suppression algorithm on the audio signals, thereby producing noise suppressed audio signals, wherein the processing relates to determining a likelihood of a presence of a voice signal in the audio signals; and

transmit the noise suppressed audio signals to the communication subsystem.

14. The mobile communication device of claim 13 wherein the mobile communication device has a front face and the accelerometer is coupled to the front face.

15. A computer-readable medium containing computer-executable instructions that, when performed by a processor of a mobile communication device, cause the processor to:

receive input related to vibration of the mobile communication device from an accelerometer;

process the input from the accelerometer;

adjust, based on the input, a noise suppression algorithm, thereby producing an adjusted noise suppression algorithm;

receive audio signals;

perform the adjusted noise suppression algorithm on the audio signals, thereby producing noise suppressed audio signals, wherein the processing relates to determining a likelihood of a presence of a voice signal in the audio signals; and

transmit the noise suppressed audio signals.

16. A method of adjusting an audio signal processing algorithm in a mobile communication device, the method comprising:

receiving input from a sensor;

processing the input from the sensor;

adjusting, based on the input, an echo cancelling algorithm, thereby producing an adjusted echo cancelling algorithm;

receiving audio signals;

performing the adjusted echo cancelling algorithm on the audio signals, thereby producing processed audio signals; and

transmitting the processed audio signals.

19. The method of claim 16 wherein the sensor comprises an accelerometer.

20. The method of claim 16 wherein the sensor comprises global positioning system hardware.

21. The method of claim 16 wherein the sensor comprises a magnetometer.

22. The method of claim 16 wherein the sensor comprises an altimeter.

23. The method of claim 16 wherein the sensor comprises a thermometer.

17. (canceled)

18. (canceled)