Source: http://www.google.com/patents/US8155926?dq=5,583,822
Timestamp: 2016-07-02 05:05:49
Document Index: 538040677

Matched Legal Cases: ['Application No. 200680038822', 'Application No. 200680037838', 'Application No. 200680037883', 'Application No. 06802318', 'Application No. 06802318', 'Application No. 06802510', 'Application No. 2008', 'Application No. 2008', 'Application No. 2008', 'Application No. 2008', 'Application No. 2008', 'Application No. 2008', 'Application No. 2008', 'Application No. 10', 'Application No. 10', 'Application No. 10', 'Application No. 10', 'Application No. 10', 'Application No. 10', 'Application No. 10', 'Application No. 200680038822']

Patent US8155926 - Method and apparatus for accommodating device and/or signal mismatch in a ... - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Sign inPatentsNoise discrimination in signals from a plurality of sensors is conducted by enhancing the phase difference in the signals such that off-axis pick-up is suppressed while on-axis pick-up is enhanced. Alternatively, attenuation/expansion are applied to the signals in a phase difference dependent manner,...http://www.google.com/patents/US8155926?utm_source=gb-gplus-sharePatent US8155926 - Method and apparatus for accommodating device and/or signal mismatch in a sensor arrayAdvanced Patent SearchPublication numberUS8155926 B2Publication typeGrantApplication numberUS 12/345,432Publication dateApr 10, 2012Filing dateDec 29, 2008Priority dateAug 26, 2005Fee statusPaidAlso published asCN101438259A, CN101438259B, EP1917533A2, EP1917533A4, US7472041, US20070050161, US20090234618, WO2007025123A2, WO2007025123A3Publication number12345432, 345432, US 8155926 B2, US 8155926B2, US-B2-8155926, US8155926 B2, US8155926B2InventorsJon C. Taenzer, Bruce G. SpicerOriginal AssigneeDolby Laboratories Licensing CorporationExport CitationBiBTeX, EndNote, RefManPatent Citations (82), Non-Patent Citations (77), Referenced by (2), Classifications (8), Legal Events (6) External Links: USPTO, USPTO Assignment, EspacenetMethod and apparatus for accommodating device and/or signal mismatch in a sensor array
US 8155926 B2Abstract
1. A method for accommodating device and/or signal mismatch in a sensor array system having a plurality of sensors configured to generate a plurality of input signals including first and second sensors generating first and second input signals, the plurality of input signals being representable, at least one frequency, by input vectors each having a phase component and a magnitude component, including first and second input vectors, the method comprising:
processing, using a processor, the first and second input signals, the processing including, at the at least one frequency, using the magnitudes of the first and second input vectors to obtain corresponding first and second magnitude-matched vectors each having a magnitude that is substantially equal to one of an arithmetic mean, a geometric mean, a harmonic mean, or a root-mean-square of the magnitudes of two or more input vectors; and
generating an output signal having a magnitude that is a function of at least one of the first and second magnitude-matched vectors.
2. The method of claim 1, wherein the device and/or signal mismatch is accommodated at each of a plurality of frequencies.
3. The method of claim 1, further comprising enhancing an input phase difference of the first and second input vectors.
4. The method of claim 3, wherein enhancing comprises increasing or decreasing the input phase difference in a frequency-dependent manner using an expansion function.
5. The method of claim 3, wherein enhancing comprises increasing or decreasing the input phase difference in a frequency-dependent manner using a look-up table.
10. The method of claim 6, wherein the adjustable sharpness parameter has one of multiple values, and its value depends on the sign of the phase difference between the first input vector and the second input vector.
11. The method of claim 3, wherein the enhancement of the input phase difference is computed using the ratio of the difference to the sum of the magnitudes of a pair of unit vectors corresponding to the first and second input vectors.
12. The method of claim 1, further comprising attenuating the magnitude-matched vectors by an attenuation factor that is a function of an input phase difference of the first and second input vectors.
13. The method of claim 1, further comprising combining the magnitude-matched vectors.
14. The method of claim 13, wherein combining comprises summing.
15. The method of claim 13, wherein combining comprises differencing.
16. The method of claim 3, wherein enhancing is conducted for phase difference values other than a selected phase difference value.
17. The method of claim 3, wherein zero enhancing is applied for a selected phase difference value, and enhancing greater than zero is applied for other phase difference values.
18. The method of claim 12, wherein attenuation is conducted for phase difference values other than a selected phase difference value.
19. The method of claim 12, wherein a maximum attenuation factor value is applied for a selected phase difference value, and attenuation factors of less than the maximum attenuation factor value are applied for other phase difference values.
20. The method of claim 3, wherein enhancing is conducted asymmetrically about a selected non-enhancement phase difference angle.
21. The method of claim 12, wherein attenuation is conducted asymmetrically about a selected non-attenuation phase angle difference.
22. A sensitivity matching circuit adapted to accommodate device and/or signal mismatch in a sensor array system having a plurality of sensors configured to generate a plurality of input signals including first and second sensors generating first and second input signals, the plurality of input signals being representable, at least one frequency, by input vectors each having a phase component and a magnitude component, including first and second input vectors, the sensitivity matching circuit comprising:
one or more circuits adapted to generate the first and second input signals from the first and second sensors and process the first and second input signals, the processing including, at the at least one frequency, using the magnitudes of the first and second input vectors to obtain corresponding first and second magnitude-matched vectors each having a magnitude that is substantially equal to one of an arithmetic mean, a geometric mean, a harmonic mean, or a root-mean-square of the magnitude of two or more input vectors, the one or more circuits further adapted to generate an output signal having a magnitude that is a function of at least one of the first and second magnitude-matched vectors.
23. The method of claim 22, wherein the device and/or signal mismatch is accommodated at each of a plurality of frequencies.
24. The method of claim 22, further comprising enhancing an input phase difference of the first and second input vectors.
25. The method of claim 24, wherein enhancing comprises increasing or decreasing the input phase difference in a frequency-dependent manner using an expansion function.
26. The method of claim 24, wherein enhancing comprises increasing or decreasing the input phase difference in a frequency-dependent manner using a look-up table.
27. The method of claim 24, wherein enhancing is performed as a function of an adjustable sharpness parameter.
28. The method of claim 27, wherein the adjustable sharpness parameter is applied multiplicatively.
29. The method of claim 27, wherein the adjustable sharpness parameter is a function of frequency.
30. The method of claim 27, wherein the adjustable sharpness parameter is inversely proportional to frequency such that uniform sensitivity across the frequency spectrum is achieved.
31. The method of claim 27, wherein the adjustable sharpness parameter has one of multiple values, and its value depends on the sign of the phase difference between the first input vector and the second input vector.
32. The method of claim 24, wherein enhancing of the input phase difference is computed using the ratio of the difference to the sum of the magnitudes of a pair of unit vectors corresponding to the first and second input vectors.
33. The method of claim 22, further comprising attenuating the magnitude-matched vectors by an attenuation factor that is a function of an input phase difference of the first and second input vectors.
34. The method of claim 22, further comprising combining the magnitude-matched vectors.
35. The method of claim 34, wherein combining comprises summing.
36. The method of claim 34, wherein combining comprises differencing.
37. The method of claim 24, wherein enhancing is conducted for phase difference values other than a selected phase difference value.
38. The method of claim 37, wherein zero enhancing is applied for a selected phase difference value, and enhancing greater than zero is applied for other phase difference values.
39. The method of claim 33, wherein attenuation is conducted for phase difference values other than a selected phase difference value.
40. The method of claim 33, wherein a maximum attenuation factor value is applied for a selected phase difference value, and attenuation factors of less than the maximum attenuation factor value are applied for other phase difference values.
41. The method of claim 24, wherein enhancing is conducted asymmetrically about a selected non-enhancement phase difference angle.
42. The method of claim 33, wherein attenuation is conducted asymmetrically about a selected non-attenuation phase angle difference. Description
The present application is a continuation application of U.S. patent application Ser. No. 11/213,446, filed on Aug. 26, 2005 now U.S. Pat. No. 7,472,041, in the name of inventors Jon C. Taenzer and Bruce G. Spicer, entitled “Method & Apparatus For Accommodating Device And/Or Signal Mismatch In A Sensor Array”.
Although the mathematical method shown above is theoretically correct, in practical (real-world) systems, the arctangent function usually generates a relative phase value that is restricted to the interval −π≦Δθ<π. Thus, when calculating the input signal phase difference angle value ΔθI, the calculated result is on the interval −2π≦Δθ<2π. Although this value can be used directly to accomplish the inventive process, for mathematical reasons it is often more convenient if the value lies on the interval −≦Δθ<π. The calculated input signal phase difference angle value ΔθI can be “re-wrapped” to lie on the desired interval by the process of adding 2π when the value is less than −π, and subtracting 2π when the value is more than π. No change is made when the value already lies on the interval −π≦θ<π. After this calculation, the resulting value for ΔθI lies on the desired interval −π≦θ<π.
ΔθI=π�ƒ{√{square root over (s 2+4(D 2 +Ds�sin φN))}−√{square root over (s 2+4(D 2 −Ds�sin φN))}}/2c where f is the center frequency for the frequency bin, s is the physical spacing between the sensor elements, D is the distance from the center of the sensor array to the noise source N, c is the propagation speed of the signal (here it is the speed of sound in air), and φN is the azimuthal angle of arrival of the signal from noise source N.
Δ θ O = π � (  Δ θ I - π  π - Δθ I �  Δ θ I + π  Δθ I + π ) � sin ( Δθ I 2 ) where ΔθI and ΔθO are the unwrapped signal phase difference values measured in radians.
Attn = cos ( Δ θ O 2 ) cos ( Δ θ I 2 ) . ( 4 ) Since ΔθO is a function of ΔθI, the attenuation value is only a function of Δθ1.
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FraterSpeakerphone and/or microphone arrays and methods and systems of the using the sameUS20110194719 *Aug 11, 2011Robert Henry FraterSpeakerphone and/or microphone arrays and methods and systems of using the same* Cited by examinerClassifications U.S. Classification702/189, 702/190, 702/191, 702/116International ClassificationG01C25/00, G03F1/26Cooperative ClassificationH04R3/005European ClassificationH04R3/00BLegal EventsDateCodeEventDescriptionJun 5, 2009ASAssignmentOwner name: STEP LABS, INC., A DELAWARE CORPORATION, CALIFORNIFree format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:STEP COMMUNICATIONS CORPORATION, A NEVADA CORPORATION;REEL/FRAME:022783/0412Effective date: 20090417Aug 18, 2009ASAssignmentOwner name: DOLBY LABORATORIES LICENSING CORPORATION, CALIFORNFree format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:STEP LABS, INC., A DELAWARE CORPORATION;REEL/FRAME:023107/0551Effective date: 20090817May 27, 2014RFReissue application filedEffective date: 20140409Jun 20, 2014ASAssignmentOwner name: DOLBY LABORATORIES LICENSING CORPORATION, CALIFORNFree format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:STEP LABSS, INC., A DELAWARE CORPORATION;REEL/FRAME:033152/0073Effective date: 20090817Jun 23, 2014ASAssignmentOwner name: DOLBY LABORATORIES LICENSING CORPORATION, CALIFORNFree format text: CORRECTION TO THE SPELLING OF ASSIGNORS NAME, PREVIOUSLY RECORDED ON REEL/FRAME 033152/0073;ASSIGNOR:STEP LABS, INC., A DELAWARE CORPORATION;REEL/FRAME:033217/0119Effective date: 20090817Oct 12, 2015FPAYFee paymentYear of fee payment: 4RotateOriginal ImageGoogle Home - Sitemap - USPTO Bulk Downloads - Privacy Policy - Terms of Service - About Google Patents - Send FeedbackData provided by IFI CLAIMS Patent Services