MULTICHANNEL AUDIO CALIBRATION METHOD AND APPARATUS

• US 20140270282A1
• Filed: 02/26/2014
• Published: 09/18/2014
• Est. Priority Date: 03/12/2013
• Status: Active Grant

• Current Assignee: Nokia Technologies Oy (Nokia Corporation)
• Original Assignee: Nokia Corporation
• Inventors: Tammi, Mikko Tapio, Rm, Anssi Sakari, Shenoy, Ravi, Vesa, Sampo
• Granted Patent: US 9,357,306 B2
• Time in Patent Office: Days
• US Class Current: 381/300
• CPC Class Codes: H04R 1/028 associated with devices performing functions other than acoustics, e.g. electric candles
• CPC Class Codes: H04R 2430/20 Processing of the output signals of the acoustic transducers of an array for obtaining a desired directivity characteristic H04R2203/12 takes precedence
• CPC Class Codes: H04R 2460/07 Use of position data from wide-area or local-area positioning systems in hearing devices, e.g. program or information selection
• CPC Class Codes: H04R 5/02 Spatial or constructional arrangements of loudspeakers
• CPC Class Codes: H04S 7/301 Automatic calibration of stereophonic sound system, e.g. with test microphone
• CPC Class Codes: H04S 7/302 Electronic adaptation of stereophonic sound system to listener position or orientation H04S7/301 takes precedence
• CPC Class Codes: H04S 7/308 Electronic adaptation dependent on speaker or headphone connection

Abstract

A method comprising: generating at least one audio signal to be output by at least one speaker for a multi-speaker system; receiving at least two output signals, the at least two output signals provided by at least two microphones and based on the at least one acoustic wave output by the at least one speaker in response to the at least one audio signal; determining a directional component associated with the at least two output signals; and comparing the directional component with an expected location of the at least one speaker.

Claims

1. An apparatus comprising:

a signal generator configured to generate at least one audio signal to be output by at least one speaker for a multi-speaker system;

at least two microphones configured to provide at least two output signals based on the acoustic output of the at least one speaker in response to the at least one audio signal;

an audio signal analyser configured to determine a directional component associated with the at least two output signals; and

a calibration processor configured to compare the directional component with an expected location of the at least one speaker so as to adjust audio playback of the at least one speaker.

2. The apparatus as claimed in claim 1, wherein the calibration processor further configured to determine a speaker positioning difference when the determined directional component differs with the expected location;

and generate a speaker positioning error message to be displayed.

3. The apparatus as claimed in claim 1, wherein the calibration processor further configured to generate a message comprising at least one of:

a speaker identification associated with the at least one speaker;

an error value associated with a speaker positioning error; and

a correction information to correct the speaker positioning error.

4. The apparatus as claimed in claim 1, wherein the calibration processor further configured to generate a speaker correction factor based on the difference between the determined directional component and the expected location of the at least one speaker.

5. The apparatus as claimed in claim 4, further comprises an audio output processor configured to apply the speaker correction factor during operation of the multi-speaker system so as to correct audio positioning of the at least one speaker.

6. The apparatus as claimed in claim 5, wherein the audio output processor further configured to determine an audio signal to be output comprising one or more location component so as to synthesise the audio signal to be output by the at least one speaker in the multi-speakers based on the one or more location component of the audio signal.

7. The apparatus as claimed in claim 4, further comprises a transmitter configured to transmit the speaker correction factor to the multi-speaker system for correcting a location of the at least one speaker.

8. The apparatus as claimed in claim 1, further comprises a level detector configured to determine a volume level associated with the at least two output signals and an expected volume level of the at least one audio signal so as to determine whether the at least one speaker is at least one of:

missing;

not connected;

incorrectly connected, based on the comparison.

9. The apparatus as claimed in claim 1, wherein the audio signal analyser further comprises a generator configured to generate more than one directional component;

and the calibration processor configured to compare each directional component with expected locations of at least two speakers to determine whether the respective locations of the at least two speakers are correct.

10. The apparatus as claimed in claim 1, wherein the apparatus further configured to determine the expected location of the at least one speaker.

11. A method comprising:

generating at least one audio signal to be output by at least one speaker for a multi-speaker system;

receiving at least two output signals, the at least two output signals provided by at least two microphones based on the at least one acoustic output by the at least one speaker in response to the at least one audio signal;

determining a directional component associated with the at least two output signals; and

comparing the directional component with an expected location of the at least one speaker;

adjusting audio playback of the at least one speaker based on the comparison of the directional component with the expected location.

12. The method as claimed in claim 11, further comprising:

determining a speaker positioning difference when the directional component differs with the expected location; and

generating a speaker positioning error message to be displayed.

13. The method as claimed in claim 12, wherein generating a speaker positioning error to be displayed comprises generating a message comprising at least one of:

speaker identification associated with the at least one speaker;

an error value associated with the speaker positioning error; and

correction information to correct the speaker positioning error.

14. The method as claimed in claims 11, further comprising:

generating a speaker correction factor based on the difference between the directional component and the expected location of the at least one speaker.

15. The method as claimed in claim 14, further comprising applying the speaker correction factor during operation of the multi-speaker system so as to correct audio positioning of the at least one speaker.

16. The method as claimed in claim 15, further comprising determining an audio signal comprising one or more location component;

and synthesising the audio signal to be output by the at least one speaker based on the one or more location component of the audio signal.

17. The method as claimed in claim 11, further comprising transmitting the speaker correction factor to the multi-speaker system for correcting the location of the at least one speaker towards the expected location of the at least one speaker.

18. The method as claimed in claim 11, further comprising:

comparing a volume level associated with the at least two output signals and an expected volume level of the at least one audio signal to be output by the at least one speaker for the multi-speaker system;

determining whether the at least one speaker is at least one of;

missing;

not connected;

incorrectly connected, based on the comparison.

19. The method as claimed in claim 11, wherein determining a directional component associated with the at least two output signals comprises generating more than one directional component;

and comparing each directional component with expected locations of at least two speakers to determine whether the respective locations of the at least two speakers are correct.

20. The method as claimed in claim 11, wherein determining an expected location of the at least one speaker further comprises at least one of:

selecting the expected location of the at least one speaker from a speaker configuration of the multi-speaker system which has the smallest difference when comparing the directional component with the expected location of the speaker;

selecting the expected location from a speaker configuration of the multi-speaker system according to a defined order in the speaker configuration; and

selecting the expected location based on a user interface input.