SOUND FIELD ENCODER

• US 20140211950A1
• Filed: 01/29/2013
• Published: 07/31/2014
• Est. Priority Date: 01/29/2013
• Status: Active Grant

• Current Assignee: Blackberry Limited
• Original Assignee: QNX Software Systems Limited (Canada) (Blackberry Limited)
• Inventors: Neufeld, Leona Arlene, Hetherington, Phillip Alan
• Granted Patent: US 9,426,573 B2
• Time in Patent Office: Days
• US Class Current: 381/23
• CPC Class Codes: H04R 2499/11 Transducers incorporated or for use in hand-held devices, e.g. mobile phones, PDA's, camera's
• CPC Class Codes: H04R 5/027 Spatial or constructional arrangements of microphones, e.g. in dummy heads
• CPC Class Codes: H04R 5/04 Circuit arrangements, e.g. for selective connection of amplifier inputs/outputs to loudspeakers, for loudspeaker detection, or for adaptation of settings to personal preferences or hearing impairments combinations of amplifiers H03F3/68; stereophonic systems H04S

Abstract

In a system and method for encoding a sound field the orientation of a computing device may be detected. Several orientation indications may be used to detect the computing device orientation. The detected orientation may be relative to a sound field that is a spatial representation of an audible environment associated with the computing device. Microphones associated with the computing device may be selected in order to receive the sound field based on the detected orientation. The received sound field may be processed and encoded with associated descriptive information.

Claims

1. A computer implemented method for encoding a sound field comprising:

detecting one or more indications of the orientation of a computing device;

selecting one or more microphones associated with the computing device responsive to the indications of the orientation of the computing device; and

encoding a sound field received by the selected microphones.

2. The computer implemented method of claim 1, where indications of the orientation of the computing device comprises any one or more of a sensor reading, an active component, an operating mode and a relative position of a user 208 interacting with the computing device.

3. The computer implemented method of claim 2, where the sensor comprises one or more of a magnetometer, an accelerometer, a proximity sensor, a gravity sensor, a gyroscope and a rotational vector sensor.

4. The computer implemented method of claim 2, where the active component comprises one or more of a front facing camera, a back facing camera or a remote camera.

5. The computer implemented method of claim 2, where the operating mode comprises one or more of a software application and an orientation lock setting.

6. The computer implemented method of claim 1, where the sound field comprises a spatial representation of an audible environment associated with the computing device.

7. The computer implemented method of claim 1, where encoding the sound field comprises processing audio signals received by the selected microphones and associating descriptive information with the audio signals.

8. The computer implemented method of claim 7, where the associated descriptive information with the selected microphones comprises any one or more of a number of selected microphones, a physical location of the selected microphones, a device identification number and video synchronization information.

9. The computer implemented method of claim 7, where the selected microphones comprises two selected microphones associated with a stereo sound field.

10. The computer implemented method of claim 7, where the selected microphones comprises three or more selected microphones associated with a multichannel sound field.

11. The computer implemented method of claim 7, where processing the audio signals received by the selected microphones comprises mixing the audio signals to produce fewer audio signals representing fewer selected microphones.

12. The computer implemented method of claim 1, where encoding the sound field further comprises:

detecting one or more indications of a change in the orientation of the computing device;

selecting one or more microphones associated with the computing device responsive to the indications of the change in the orientation of the computing device; and

applying variable ratio mixing when switching to encoding the sound field received by the selected microphones responsive to the indications of the change in the orientation of the computing device.

13. A system for encoding a sound field comprising:

an orientation detector to detect one or more indications of the orientation of a computing device;

a microphone selector to select one or more microphones associated with the computing device responsive to the indications of the orientation of the computing device; and

a sound field encoder to encode a sound field received by the selected microphones.

14. The system for encoding a sound field of claim 13, where indications of the orientation of the computing device comprises any one or more of a sensor reading, an active component, an operating mode and a relative position of a user interacting with the computing device.

15. The system for encoding a sound field of claim 14, where the sensor comprises one or more of a magnetometer, an accelerometer, a proximity sensor, a gravity sensor, a gyroscope and a rotational vector sensor.

16. The system for encoding a sound field of claim 14, where the active component comprises one or more of a front facing camera, a back facing camera or a remote camera.

17. The system for encoding a sound field of claim 14, where the operating mode comprises one or more of a software application and an orientation lock setting.

18. The system for encoding a sound field of claim 13, where the sound field comprises a spatial representation of an audible environment associated with the computing device.

19. The system for encoding a sound field of claim 13, where encoding the sound field comprises processing the audio signals received by the selected microphones and associating descriptive information with the audio signals.

20. The system for encoding a sound field claim 19, where the descriptive information associated with the selected microphones comprises any one or more of a number of selected microphones, a physical location of the selected microphones, a device identification number and video synchronization information.

21. The system for encoding a sound field of claim 19, where select one or more microphones comprises selecting two microphones associated with a stereo sound field.

22. The system for encoding a sound field of claim 19, where select one or more microphones comprises selecting three or more microphones associated with a multichannel sound field.

23. The system for encoding a sound field of claim 19, where processing the audio signals received by the selected microphones comprises mixing the audio signals to produce fewer audio signals representing fewer selected microphones.

24. The system for encoding a sound field of claim 13, where the sound field encoder further comprises:

an orientation detector to detect one or more indications of a change in the orientation of the computing device;

a microphone selector to select one or more microphones associated with the computing device responsive to the indications of the change in the orientation of the computing device; and

a mixer to apply variable ratio mixing when switching to encoding the sound field received by the selected microphones responsive to the indications of the change in the orientation of the computing device.