AUTOMATIC AUDIO SYSTEM EQUALIZING

• US 20170086003A1
• Filed: 12/01/2016
• Published: 03/23/2017
• Est. Priority Date: 03/25/2002
• Status: Active Grant

• Current Assignee: Bose Corporation
• Original Assignee: Bose Corporation
• Inventors: Rabinowitz, William M., Lehnert, Hilmar, Martin, Keith D., Saffran, Richard, Kulkarni, Abhijit, Arnold, Finn A.
• Granted Patent: US 10,051,393 B2
• Time in Patent Office: Days
• CPC Class Codes: H04R 2205/024 Positioning of loudspeaker enclosures for spatial sound reproduction
• CPC Class Codes: H04R 2430/01 Aspects of volume control, not necessarily automatic, in sound systems
• CPC Class Codes: H04R 29/001 for loudspeakers H04R29/007 takes precedence
• CPC Class Codes: H04R 29/002 Loudspeaker arrays
• CPC Class Codes: H04R 3/04 for correcting frequency response
• CPC Class Codes: H04R 3/12 for distributing signals to two or more loudspeakers specially adapted for hearing aids H04R25/407
• CPC Class Codes: H04S 7/301 Automatic calibration of stereophonic sound system, e.g. with test microphone
• CPC Class Codes: H04S 7/307 Frequency adjustment, e.g. tone control H04S7/301 takes precedence

Abstract

An automated process for equalizing an audio system and an apparatus for implementing the process. An audio system includes a microphone unit, for receiving the sound waves radiated from a plurality of speakers, acoustic measuring circuitry, for calculating frequency response measurements; a memory, for storing characteristic data of the loudspeaker units and further for storing the frequency response measurements; and equalization calculation circuitry, for calculating an equalization pattern responsive to the digital data and responsive to the characteristic data of the plurality of loudspeaker units. Also described is an automated equalizing system including a acoustic measuring circuitry including a microphone for measuring frequency response at a plurality of locations; a memory, for storing the frequency responses at the plurality of locations; and equalization calculation circuitry, for calculating, from the frequency responses, an optimized equalization pattern.

Claims

1. A portable computer device comprising:

a microphone for receiving and transducing sound waves, acoustic measuring circuitry coupled to microphone for measuring acoustic responses of the sound waves received and transduced by the microphone;

a processor coupled to acoustic measuring circuitry;

a memory coupled to the processor; and

a software program stored on the memory, which, when executed by the processor, causes the processor to;

cause instructions to be communicated to a user, the instructions directing the user to move the microphone to different locations in a listening space;

cause the microphone to receive sound waves radiated by a loudspeaker as the microphone is moved to different locations in the listening space;

cause the acoustic measuring circuitry to measure a plurality of acoustic responses as the microphone is moved to different locations in the listening space; and

while the acoustic responses are being measured, determine if the ambient noise exceeds a predetermined threshold; and

if the ambient noise exceeds the predetermined threshold, generate a message.

2. The portable computer device of claim 1, wherein generating the message comprises broadcasting verbal or visual instructions to the user to decrease the ambient noise level.

3. The portable computer device of claim 1,

wherein causing the acoustic measuring circuitry to measure a plurality of acoustic responses comprises causing the acoustic measuring circuitry to measure a first acoustic response to a first audio signal transduced by the loudspeaker, and causing the acoustic measuring circuitry to measure a second acoustic response to a second audio signal transduced by the loudspeaker;

and

wherein causing the processor to determine if the ambient noise exceeds a predetermined threshold comprises causing the processor to automatically compare the first and second acoustic responses so as to determine a difference between the first and second acoustic responses.

4. The portable computer device of claim 4, wherein automatically comparing the first and second acoustic responses comprises scaling up the second acoustic response a pre-determined amount and comparing the scaled up second acoustic response to the first acoustic response so as to determine a difference therebetween.

5. The portable computer device of claim 4, wherein scaling up the second acoustic response comprises scaling up the second acoustic response by 3 dB.

6. A process for generating an equalization pattern in an audio system that includes a loudspeaker deployed in a listening area, said listening area having an ambient noise level, said process comprising:

providing a microphone that is in possession of a user in the listening area;

causing instructions to be communicated to a user, the instructions directing the user to move the microphone to different locations in the listening space;

causing the microphone to receive sound waves radiated by the loudspeaker as the microphone is moved to different locations in the listening space;

automatically measuring a plurality of acoustic responses as the microphone is moved to different locations in the listening space; and

while the acoustic responses are being measured, determining if the ambient noise exceeds a predetermined threshold; and

if the ambient noise is below the predetermined threshold, calculating an equalization pattern from at least one of the acoustic responses, and providing the equalization pattern to the loudspeaker; and

if the ambient noise exceeds the predetermined threshold, generating a message.

7. The process of claim 6, wherein generating the message comprises broadcasting verbal or visual instructions to the user to decrease the ambient noise level.

8. The process of claim 6, further comprising:

causing the loudspeaker to transduce a first audio signal; and

causing the loudspeaker to transduce a second audio signal,

wherein automatically measuring the plurality of acoustic responses comprises;

measuring a first acoustic response to the first audio signal transduced by the loudspeaker, and measuring a second acoustic response to the second audio signal transduced by the loudspeaker, and

wherein determining if the ambient noise exceeds a predetermined threshold comprises;

automatically comparing the first and second acoustic responses so as to determine a difference between the first and second acoustic responses.

9. The process of claim 8, wherein causing the loudspeaker transduce the second audio signal comprises scaling down the first audio signal and causing the loudspeaker to transduce the scaled down first audio signal.

10. The process of claim 9, wherein scaling down the first audio signal comprises scaling down the first audio signal by 3 dB.

11. The process of claim 8, wherein automatically comparing the first and second acoustic responses comprises scaling up the second acoustic response a pre-determined amount and comparing the scaled up second acoustic response to the first acoustic response so as to determine a difference therebetween.

12. The process of claim 11, wherein scaling up the second acoustic response comprises scaling up the second acoustic response by 3 dB.

13. An audio system comprising

a loudspeaker;

audio signal processing circuitry coupled to the loudspeaker;

a microphone for receiving and transducing sound waves; and

a portable computer device comprising;

acoustic measuring circuitry coupled to the microphone for measuring acoustic responses of the sound waves received and transduced by the microphone;

a processor coupled to acoustic measuring circuitry;

a memory coupled to the processor; and

a software program stored on the memory, which, when executed by the processor, causes the processor to;

cause instructions to be communicated to a user, the instructions directing the user to move the microphone to different locations in a listening space;

cause the microphone to receive sound waves radiated by a loudspeaker as the microphone is moved to different locations in the listening space;

cause the acoustic measuring circuitry to measure a plurality of acoustic responses as the microphone is moved to different locations in the listening space;

while the acoustic responses are being measured, determine if the ambient noise exceeds a predetermined threshold; and

if the ambient noise exceeds the predetermined threshold, generate a message.

14. The audio system of claim 13, wherein generating the message comprises broadcasting verbal or visual instructions to the user to decrease the ambient noise level.

15. The audio system of claim 13, wherein causing the acoustic measuring circuitry to measure a plurality of acoustic responses comprises:

causing the acoustic measuring circuitry to measure a first acoustic response to a first audio signal transduced by the loudspeaker; and

causing the acoustic measuring circuitry to measure a second acoustic response to a second audio signal transduced by the loudspeaker; and

wherein causing the processor to determine if the ambient noise exceeds a predetermined threshold comprises causing the processor to automatically compare the first and second acoustic responses so as to determine a difference between the first and second acoustic responses.

16. The audio system of claim 15, wherein comparing the first and second acoustic responses comprises scaling up the second acoustic response a pre-determined amount and comparing the scaled up second acoustic response to the first acoustic response so as to determine a difference therebetween.

17. The audio system of claim 16, wherein scaling up the second acoustic response comprises scaling up the second acoustic response by 3 dB.

18. The audio system of claim 13, wherein the software program causes the processor to determine, using the plurality of acoustic responses, audio parameters that are appropriate to achieve a desired acoustic response from the loudspeaker.

19. The audio system of claim 18, wherein the software program further causes the processor to store the audio parameters on the memory.

20. The audio system of claim 18, wherein the audio parameters comprise data describing digital filters.

21. The audio system of claim 18, wherein the audio parameters comprise filter coefficients.

22. The audio system of claim 18, wherein the audio parameters define an equalization pattern.

23. The audio system of claim 22, wherein the equalization pattern is stored on the memory in the form of data describing digital filters.

24. The audio system of claim 18, wherein the software program causes the processor to cause the portable computer device to transmit the audio parameters to the audio signal processing circuitry, and wherein the audio signal processing circuitry is configured to apply the audio parameters to audio signals transmitted to the loudspeaker for transduction to sound waves.

25. The audio system of claim 24, wherein the microphone is included in the portable computer device.

26. The audio system of claim 13, wherein the microphone is releasably coupled to the acoustic measuring circuitry via a jack.

27. The audio system of claim 13, wherein the microphone is adapted to be attached to, or mounted on, the portable computer device.