Source: http://www.google.com/patents/US8155927?dq=6272333
Timestamp: 2014-08-02 02:52:11
Document Index: 426548669

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. 10', 'Application No. 10', 'Application No. 10', 'Application No. 10', 'Application No. 10', 'Application No. 10', 'Application No. 10', 'Application No. 200680038822']

Patent US8155927 - Method and apparatus for improving noise discrimination in multiple sensor pairs - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Sign in<nobr>Advanced Patent Search</nobr>PatentsNoise 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/US8155927?utm_source=gb-gplus-sharePatent US8155927 - Method and apparatus for improving noise discrimination in multiple sensor pairsAdvanced Patent SearchPublication numberUS8155927 B2Publication typeGrantApplication numberUS 12/848,434Publication dateApr 10, 2012Filing dateAug 2, 2010Priority dateAug 26, 2005Also published asUS7415372, US7788066, US20070050176, US20080040078, US20110029288, WO2007025224A2, WO2007025224A3Publication number12848434, 848434, US 8155927 B2, US 8155927B2, US-B2-8155927, US8155927 B2, US8155927B2InventorsJon C. Taenzer, Bruce G. SpicerOriginal AssigneeDolby Laboratories Licensing CorporationExport CitationBiBTeX, EndNote, RefManPatent Citations (85), Non-Patent Citations (73), Classifications (14), Legal Events (1) External Links: USPTO, USPTO Assignment, EspacenetMethod and apparatus for improving noise discrimination in multiple sensor pairsUS 8155927 B2Abstract Noise 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, consistent with suppression of off-axis pick-up and on-axis enhancement. Nulls between sensitivity lobes are widened, effectively narrowing the sensitivity lobes and improving directionality and noise discrimination.
We claim: 1. A device for improving noise discrimination, comprising:
CROSS-REFERENCE TO RELATED APPLICATIONS This application is a continuation of U.S. patent application Ser. No. 11/973,827, filed on Oct. 9, 2007, now U.S. Pat. No. 7,788,066, which is a continuation of U.S. patent application Ser. No. 11/213,661, filed on Aug. 26, 2005, entitled �Method and Apparatus for Improving Noise Discrimination in Multiple Sensor Pairs,� now U.S. Pat. No. 7,415,372, the disclosures of which are incorporated by reference in their entirety.
Once the data is processed, the standard frequency domain method then calls for inverse transformation of each frame of processed data to create a string of processed time domain frames of �real� data. Circuit 18, emoting an inverse fast Fourier transform (IFFT) process, performs this objective. If a synthesis window 14 b is used, then it is applied at circuit 13 by multiplication of the output frame of time domain data with the selected synthesis window: otherwise the output frame of data from circuit 18 is passed directly to circuit 19. Alternatively, the frequency domain representation of the synthesis window can be applied to the output from the signal process 17 by convolving the output from the process with the transformed synthesis window before performing the inverse Fourier transform at circuit 18. The time domain frames are subsequently re-assembled by circuit 19 by performing concatenating or overlapping-and-adding of the frames of processed real-time data to create the final digitized and sampled temporal output signal waveform containing the processed signal information. Of course, this sampled signal can be, and often is, converted into an analog signal by the use of a standard Digital-to-Analog conversion (D/A or DAC) method (not shown) so that the processed output signal can be used in myriad applications, such as scientific measurement, telephony, entertainment systems, communication systems, and so on.
where MA (n) is the average magnitude of input signal A for the frequencies represented by frequency bin n, and where θA (n) is the average relative signal phase of input signal A for the frequencies represented by the same frequency bin n. The signal phase is often referred to as the �electrical phase� of the signal.
Although the mathematical method shown above is theoretically correct, in practical (real-world) systems, the arc tangent 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 −π≦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≦Δθ<π. After this calculation, the resulting value for ΔθI lies on the desired interval −θ≦Δθ<π.
Δθ I = π ⁢ f � s c � sin ⁢ ⁢ ϕ N By making the system of the invention �think� that the arrival of most off-axis noise signals is from sources that are near +90� azimuth, these signals are made to fall in the nulls, and are then considerably attenuated by the subsequent beamforming process of signal vector summation. In accordance with one aspect of the invention, this is accomplished by expanding the measured input electrical phase difference number ΔθI toward �180� at 53 in FIG. 5 using an appropriate expansion function.
Δθ O = π � sgn ⁡ ( Δϕ I ) � { 1 - [ 1 - (  Δϕ I  π ) ] S } ( 1 ) where the angles ΔθI and ΔθO are expressed in radians, and S is a parameter that controls the narrowness or sharpness of the resulting sensitivity beam, 1<S<∞.
When there is no expansion, for example when the sharpness parameter S is set equal to 1 in the above equation, the output signal phase angle difference number .DELTA..theta..sub.O is equal to the input signal phase angle difference number ΔθI�that is, ΔθO=ΔθI�and the system operates like a conventional beamforming system. This condition is shown by the diagonal graph curve 60 in FIG. 6( a).
Δθ O = π � (  Δϕ - π  π - Δϕ I �  Δϕ + π  Δϕ + π ) � sin ⁡ ( Δϕ I 2 ) where ΔθI and ΔθO are the unwrapped signal phase difference values measured in radians.
FIGS. 8( b), 8(d) and 8(e) illustrate the beamforming performance of the inventive approach. As an example, the performance of a conventional beamforming system using two cardioid microphone sensor elements spaced 7-cm apart is shown in FIG. 8( a). It is readily apparent from FIG. 8( a) that the sensitivity beam pattern is essentially that of the cardioid elements themselves for low frequencies (below 1000 Hz) where the wavelength is large relative to the element-to-element spacing s and, thus the array aperture is much smaller than one half wavelength. At higher frequencies the beam pattern narrows, but as it narrows, side lobes are formed. For example, at 3000 Hz, a relatively narrow main lobe is formed, but several side lobes are clearly evident. Further, it is obvious that the sensitivity pattern is different for every frequency, and particularly for off-axis sounds, the sensitivity is frequency-dependent so that off-axis sound signals are changed or �colored�.
 Out  =  A  � cos ⁡ ( Δϕ I 2 ) =  B  � cos ⁡ ( Δϕ I 2 ) . ( 2 ) Similarly, in the novel beamforming system, when the signal magnitudes are matched, the input signal vectors A′ and B′ form another isosceles triangle. The output signal Out′ is created by calculating the vector average of A′ and B′ (at 55 in FIG. 5, or 95 in FIG. 9), and the new output signal vector Out′ bisects this triangle. Thus, a right triangle O-B′-Out′ is formed, where the magnitude of the output signal vector Out′ is given by:
 Out ′  =  A ′  � cos ⁡ ( Δϕ O 2 ) =  B ′  � cos ⁡ ( Δϕ O 2 ) . ( 3 ) When phase-expansion is applied to the input signal electrical phase angle difference, the magnitude of this output vector Out′ is always less than that of the conventional beamformer output vector Out, although the phase of the output signal is unchanged. Thus, with matched signal levels, the phase expansion process of the novel noise reduction beamforming system reduces the magnitude, but retains the phase, of the output signal produced by the conventional beamforming system. This reduction in magnitude is shown in FIG. 10 as the difference in vector lengths 101.
Attn = cos ( Δθ O 2 ) cos ⁡ ( Δθ I 2 ) . ( 4 ) Since ΔθO is a function of ΔθI, the attenuation value is only a function of ΔθI.
Output ⁢ ⁢ 140 =  A   B  This scalar value Output 140 is used at circuit 141, to divide the input vector A, whose magnitude is |A|. The result is that the output vector signal from circuit 141, the vector signal A′″, has a magnitude equal to the geometric mean of the magnitudes of the two input vectors A and B, but the electrical phase angle of input vector A. The scalar value from 140 is also used at circuit 142 to multiply input vector B, resulting in the vector signal B′, whose magnitude is also the geometric mean of the magnitudes of the two input vectors, but whose electrical phase angle is the same as that of input vector B. It will be appreciated that the method shown in FIG. 14 inherently provides geometric mean magnitude equalization which serves to correct for the unmatched character of the two sensors.
Patent CitationsCited PatentFiling datePublication dateApplicantTitleUS3057960Mar 13, 1961Oct 9, 1962Bell Telephone Labor IncNormalized sound control systemUS3068474Dec 4, 1958Dec 11, 1962Thompson Ramo Wooldridge IncRadio direction finding systemUS3130385Aug 25, 1961Apr 21, 1964Galloway Richard TApparatus for determining the direction of arrival of wave energyUS3137854May 19, 1959Jun 16, 1964Thompson Ramo Wooldridge IncLocating system for detectable energyUS3370267Oct 23, 1965Feb 20, 1968Hughes Aircraft CoBeam forming systemUS3392392Jun 5, 1967Jul 9, 1968Motorola IncBearing measurement system using statistical signal processing by analog techniquesUS3441900Jul 18, 1967Apr 29, 1969Control Data CorpSignal detection,identification,and communication system providing good noise discriminationUS3464056Jan 30, 1968Aug 26, 1969Krupp GmbhApparatus for displaying the direction of incident plane wavesUS3518675Feb 25, 1969Jun 30, 1970Us NavyApproximating the networks for a beamforming transducer arrayUS3961172Dec 5, 1974Jun 1, 1976Robert Stewart HutcheonReal-time cross-correlation signal processorUS4060850Apr 25, 1977Nov 29, 1977The United States Of America As Represented By The Secretary Of The NavyBeam former using bessel sequencesUS4599622Jul 11, 1984Jul 8, 1986The United States Of America As Represented By The Secretary Of The Air ForcePhase only adaptive nulling in a monopulse antennaUS4932063Oct 31, 1988Jun 5, 1990Ricoh Company, Ltd.Noise suppression apparatusUS4956867Apr 20, 1989Sep 11, 1990Massachusetts Institute Of TechnologyAdaptive beamforming for noise reductionUS5111823Apr 16, 1990May 12, 1992National Fertility InstituteApparatus and method for generating echographic imagesUS5226087Apr 20, 1992Jul 6, 1993Matsushita Electric Industrial Co., Ltd.Microphone apparatusUS5289544Dec 31, 1991Feb 22, 1994Audiological Engineering CorporationMethod and apparatus for reducing background noise in communication systems and for enhancing binaural hearing systems for the hearing impairedUS5383457Jan 2, 1992Jan 24, 1995National Fertility InstituteMethod and apparatus for processing imagesUS5448248Nov 22, 1993Sep 5, 1995United Technologies CorporationAdaptive radio direction finding systemUS5471527Dec 2, 1993Nov 28, 1995Dsc Communications CorporationIn a telecommunications networkUS5473637Oct 5, 1993Dec 5, 1995Pacific Communication Sciences, Inc.Open-loop phase estimation methods and apparatus for coherent demodulation of phase modulated carriers in mobile channelsUS5524060Feb 14, 1994Jun 4, 1996Euphonix, Inc.Visuasl dynamics management for audio instrumentUS5581495Sep 23, 1994Dec 3, 1996United States Of AmericaAdaptive signal processing array with unconstrained pole-zero rejection of coherent and non-coherent interfering signalsUS5581620Apr 21, 1994Dec 3, 1996Brown University Research FoundationSignal processing apparatusUS5586191Apr 11, 1994Dec 17, 1996Lucent Technologies Inc.Adjustable filter for differential microphonesUS5884254Aug 19, 1996Mar 16, 1999Sensimetrics CorporationMethod and apparatus for restricting microphone acceptance angleUS5896449Sep 25, 1996Apr 20, 1999Alcatel Usa Sourcing L.P.Voice enhancement system and methodUS6120450Mar 11, 1999Sep 19, 2000Commonwealth Scientific And Industrial Research OrganisationPhase and/or amplitude aberration correction for imagingUS6668062May 9, 2000Dec 23, 2003Gn Resound AsFFT-based technique for adaptive directionality of dual microphonesUS6766029Sep 3, 1998Jul 20, 2004Phonak AgMethod for electronically selecting the dependency of an output signal from the spatial angle of acoustic signal impingement and hearing aid apparatusUS6867731Mar 7, 2003Mar 15, 2005Raytheon Canada LimitedNoise suppression system and method for phased-array based systemsUS6950528Mar 25, 2004Sep 27, 2005Siemens Audiologische Technik GmbhMethod and apparatus for suppressing an acoustic interference signal in an incoming audio signalUS6983055Dec 5, 2001Jan 3, 2006Gn Resound North America CorporationMethod and apparatus for an adaptive binaural beamforming systemUS7099698Nov 3, 2003Aug 29, 2006Vivato, Inc.Complementary beamforming methods and apparatusesUS7110549Nov 6, 2001Sep 19, 2006Sony Deutschland GmbhNoise reduction in a stereo receiverUS7155019Mar 14, 2001Dec 26, 2006Apherma CorporationAdaptive microphone matching in multi-microphone directional systemUS7171008Jul 12, 2002Jan 30, 2007Mh Acoustics, LlcReducing noise in audio systemsUS7327852Jan 31, 2005Feb 5, 2008Dietmar RuwischMethod and device for separating acoustic signalsUS7415372Aug 26, 2005Aug 19, 2008Step Communications CorporationMethod and apparatus for improving noise discrimination in multiple sensor pairsUS7436188Aug 26, 2005Oct 14, 2008Step Communications CorporationSystem and method for improving time domain processed sensor signalsUS7472041Aug 26, 2005Dec 30, 2008Step Communications CorporationMethod and apparatus for accommodating device and/or signal mismatch in a sensor arrayUS7609789 *May 19, 2005Oct 27, 2009MetaLink, Ltd.Phase noise compensation for MIMO WLAN systemsUS7619563Aug 26, 2005Nov 17, 2009Step Communications CorporationBeam former using phase difference enhancementUS7788066Oct 9, 2007Aug 31, 2010Dolby Laboratories Licensing CorporationMethod and apparatus for improving noise discrimination in multiple sensor pairsUS8111192 *Oct 30, 2009Feb 7, 2012Dolby Laboratories Licensing CorporationBeam former using phase difference enhancementUS20020115452Jan 28, 2002Aug 22, 2002Whikehart J. WilliamAntenna beam steering responsive to receiver and broadcast trasmitterUS20030147538Jul 12, 2002Aug 7, 2003Mh Acoustics, Llc, A Delaware CorporationReducing noise in audio systemsUS20030210179Mar 7, 2003Nov 13, 2003Reza DizajiNoise suppression system and method for phased-array based systemsUS20040120532Dec 11, 2003Jun 24, 2004Stephane DedieuMethod of broadband constant directivity beamforming for non linear and non axi-symmetric sensor arrays embedded in an obstacleUS20040252852Mar 29, 2004Dec 16, 2004Taenzer Jon C.Hearing system beamformerUS20050052556Feb 17, 2004Mar 10, 2005Silverbrook Research Pty LtdImage processorUS20050157884Jun 2, 2004Jul 21, 2005Nobuhide EguchiAudio encoding apparatus and frame region allocation circuit for audio encoding apparatusUS20050168808Dec 6, 2004Aug 4, 2005Hiroshi IshiwataMethods for implement microscopy and microscopic measurement as well as microscope and apparatus for implementing themUS20050276504Jun 14, 2005Dec 15, 2005Charles ChuiImage clean-up and pre-codingUS20060262868May 19, 2005Nov 23, 2006Amir LeshemPhase noise compensation for MIMO WLAN systemsUS20060282262Apr 21, 2006Dec 14, 2006Vos Koen BSystems, methods, and apparatus for gain factor attenuationUS20070003074Jan 31, 2005Jan 4, 2007Dietmar RuwischMethod and device for separating of sound signalsUS20070046278 *Aug 26, 2005Mar 1, 2007Step Communications Corporation, A Nevada CorporationSystem and method for improving time domain processed sensor signalsUS20070046540 *Aug 26, 2005Mar 1, 2007Step Communications Corporation, A Nevada CorporationBeam former using phase difference enhancementUS20070047742Aug 26, 2005Mar 1, 2007Step Communications Corporation, A Nevada CorporationMethod and system for enhancing regional sensitivity noise discriminationUS20070047743Aug 26, 2005Mar 1, 2007Step Communications Corporation, A Nevada CorporationMethod and apparatus for improving noise discrimination using enhanced phase difference valueUS20070050161 *Aug 26, 2005Mar 1, 2007Step Communications Corporation, A Neveda CorporationMethod & apparatus for accommodating device and/or signal mismatch in a sensor arrayUS20070050176 *Aug 26, 2005Mar 1, 2007Step Communications Corporation, A Nevada CorporationMethod and apparatus for improving noise discrimination in multiple sensor pairsUS20070050441Aug 26, 2005Mar 1, 2007Step Communications Corporation,A Nevada CorporatiMethod and apparatus for improving noise discrimination using attenuation factorUS20070115078Jan 23, 2007May 24, 2007Kabushiki Kaisha ToshibaFilm bulk acoustic-wave resonator and method for manufacturing the sameUS20080040078Oct 9, 2007Feb 14, 2008Step Communications CorporationMethod and apparatus for improving noise discrimination in multiple sensor pairsUS20090234618Dec 29, 2008Sep 17, 2009Step Labs, Inc.Method & Apparatus For Accommodating Device And/Or Signal Mismatch In A Sensor ArrayUS20100109951Oct 30, 2009May 6, 2010Dolby Laboratories, Inc.Beam former using phase difference enhancementCN1267444AJul 14, 1998Sep 20, 2000福纳克有限公司Method for electronically selecting dependency of output signal from spatial angle of acoustic signal impingement and hearing aid apparatusEP0381498A2Feb 1, 1990Aug 8, 1990Matsushita Electric Industrial Co., Ltd.Array microphoneJP2002095084A Title not availableJP2002204493A Title not availableJP2003078988A Title not availableJP2003156552A Title not availableJP2003506937A Title not availableJP2004537944A Title not availableJP2011125578A Title not availableJPH0522787A Title not availableJPH0587619U Title not availableJPH01137900A Title not availableJPH10313497A Title not availableJPS60103900A Title not availableWO1995029479A1Apr 20, 1995Nov 2, 1995Univ Brown Res FoundMethods and apparatus for adaptive beamformingWO2001060112A2May 23, 2001Aug 16, 2001Phonak AgMethod of generating an electrical output signal and acoustical/electrical conversion systemWO2001091513A2May 3, 2001Nov 29, 2001Koninkl Philips Electronics NvMethod for noise suppression in an adaptive beamformer* Cited by examinerNon-Patent CitationsReference1Arabi, P. et al., "Phase-Based Dual Microphone Robust Speech Enhancement", IEEE 2004, pp. 1763-1773.2Chinese Office Action in Chinese Application No. 200680038822.2, Nov. 22, 2011.3Chinese Office Action in Chinese Patent Application No. 200680037838.1, mailed Jun. 30, 2011.4Chinese Office Action in Chinese Patent Application No. 200680037883.7, mailed Mar. 30, 2011.5European Office Action in European Application No. 06802318, mailed Sep. 29, 2011.6European Search Report and Opinion in European Application No. 06802318.3, mailed Jan. 31, 2011.7European Search Report and Opinion in European Application No. 06802510.5, mailed Feb. 22, 2011.8International Search Report and Written Opinion in International Application No. PCT/US06/33391, mailed Jun. 5, 2008.9International Search Report and Written Opinion mailed Aug. 16, 2007 in PCT Application PCT/US06/33600.10International Search Report and Written Opinion mailed Feb. 12, 2007 in PCT Application PCT/US06/33390.11International Search Report and Written Opinion mailed Jun. 5, 2008 in PCT Application PCT/US06/33391.12International Search Report and Written Opinion mailed Mar. 5, 2007 in PCT Application PCT/US06/33059.13International Search Report and Written Opinion mailed Nov. 1, 2007 in PCT Application PCT/US06/33220.14International Search Report and Written Opinion mailed Oct. 1, 2007 in PCT Application PCT/US06/33410.15International Search Report mailed May 19, 2008 in International Application No. PCT/US06/33213.16Japanese Notice of Allowance in Japanese Patent Application No. 2008-528239, issued Jun. 7, 2011.17Japanese Office Action (First) in Japanese Application No. 2008-528183, mailed Aug. 31, 2010.18Japanese Office Action (First) in Japanese Application No. 2008-528239, mailed Aug. 31, 2010.19Japanese Office Action (Second) in Japanese Application No. 2008-528178, mailed Jan. 4, 2012.20Japanese Office Action (Second) in Japanese Application No. 2008-528183, mailed Feb. 1, 2011.21Japanese Office Action (Second) in Japanese Application No. 2008-528239, mailed Feb. 1, 2011.22Kaneda Y. et al., "Noise Suppression Signal Processing Using 2-Point Received Signals," Electronics and Communications in Japan, vol. 67-A, No. 12, Dec. 1984, pp. 19-28.23Korean Non-Final Rejection in Korean Application No. 10-2008-7007118, dated Sep. 24, 2010.24Korean Non-Final Rejection in Korean Application No. 10-2008-7007119, dated Dec. 8, 2009.25Korean Non-Final Rejection in Korean Application No. 10-2008-7007120, dated Dec. 8, 2009.26Korean Notice of Allowance in Korean Application No. 10-2008-7007118, dated May 31, 2011.27Korean Notice of Allowance in Korean Application No. 10-2008-7007119, dated May 31, 2010.28Korean Notice of Allowance in Korean Application No. 10-2008-7007120, dated May 31, 2010.29Marro, C. et al., "Analysis of Noise Reduction and Dereverberation Techniques Based on Microphone Arrays with Postfiltering,"' IEEE Trans. On Speech and Audio Processing, vol. 6, No. 3, May 1998, pp. 240-259.30Non-Final Rejection mailed Jan. 27, 2010 in Korean Application No. 10-2008-7007118.31Notice of Allowance from U.S. Appl. No. 11/213,661, mailed Apr. 21, 2008.32Notice of Allowance in U.S. Appl. No. 11/212,923, mailed Jan. 17, 2008.33Notice of Allowance in U.S. Appl. No. 11/212,923, mailed May 27, 2008.34Notice of Allowance in U.S. Appl. No. 11/213,445, mailed Jul. 6, 2009.35Notice of Allowance in U.S. Appl. No. 11/213,446, mailed Aug. 21, 2008.36Notice of Allowance in U.S. Appl. No. 11/973,827, mailed Apr. 30, 2010.37Notice of Allowance in U.S. Appl. No. 12/345,432, mailed Oct. 25, 2011.38Notice of Allowance in U.S. Appl. No. 12/610,238, mailed Apr. 14, 2011.39Notice of Allowance in U.S. Appl. No. 12/610,238, mailed Mar. 15, 2011.40Office Action from U.S. Appl. No. 11/213,661, mailed Jun. 7, 2007.41Office Action from U.S. Appl. No. 11/213,661, mailed Oct. 23, 2006.42Office Action in U.S. Appl. No. 11/212,498, dated Feb. 15, 2011.43Office Action in U.S. Appl. No. 11/212,498, mailed May 25, 2011.44Office Action in U.S. Appl. No. 11/212,498, mailed Oct. 26, 2011.45Office Action in U.S. Appl. No. 11/212,923, mailed Dec. 29, 2006.46Office Action in U.S. Appl. No. 11/212,923, mailed Jun. 20, 2007.47Office Action in U.S. Appl. No. 11/212,923, mailed Mar. 28, 2006.48Office Action in U.S. Appl. No. 11/213,445, mailed Apr. 17, 2009.49Office Action in U.S. Appl. No. 11/213,445, mailed Apr. 24, 2007.50Office Action in U.S. Appl. No. 11/213,445, mailed Apr. 9, 2008.51Office Action in U.S. Appl. No. 11/213,445, mailed Oct. 15, 2007.52Office Action in U.S. Appl. No. 11/213,445, mailed Sep. 26, 2008.53Office Action in U.S. Appl. No. 11/213,446, mailed Apr. 29, 2008.54Office Action in U.S. Appl. No. 11/213,446, mailed Aug. 31, 2007.55Office Action in U.S. Appl. No. 11/213,446, mailed Oct. 16, 2006.56Office Action in U.S. Appl. No. 11/213,448, mailed Feb. 15, 2011.57Office Action in U.S. Appl. No. 11/213,448, mailed Jul. 21, 2011.58Office Action in U.S. Appl. No. 11/213,448, mailed Nov. 30, 2011.59Office Action in U.S. Appl. No. 11/213,629, mailed Mar. 26, 2010.60Office Action in U.S. Appl. No. 11/213,629, mailed May 24, 2011.61Office Action in U.S. Appl. No. 11/213,629, mailed Sep. 14, 2011.62Office Action in U.S. Appl. No. 11/213,629, mailed Sep. 29, 2009.63Office Action in U.S. Appl. No. 11/973,827, mailed Nov. 4, 2009.64Office Action in U.S. Appl. No. 12/345,432, mailed Apr. 1, 2011.65Office Action issued Aug. 26, 2010 in U.S. Appl. No. 12/610,238.66Office Action issued May 12, 2010 in U.S. Appl. No. 11/212,498.67Office Action issued Oct. 22, 2010 in U.S. Appl. No. 11/212,498.68Office Action issued Oct. 6, 2010 in U.S. Appl. No. 11/213,629.69Office Action mailed Apr. 12, 2010 in U.S. Appl. No. 11/213,448.70Office Action mailed Jun. 25, 2009 in U.S. Appl. No. 11/212,498.71Office Action mailed May 11, 2010 in Chinese Application No. 200680038822.2.72Office Action mailed Sep. 29, 2009 in U.S. Appl. No. 11/213,448.73Sachar, J. M. et al., "Microphone Position and Gain Calibration for a Large-Aperture Microphone Array," IEEE Trans. On Speech and Audio Processing, vol. 13, No. 1, Jan. 2005, pp. 42-52.Classifications U.S. Classification702/191, 702/189, 381/73.1, 702/72, 702/71, 381/71.1, 381/94.1, 708/300, 702/69International ClassificationG01R29/00, G01R29/26, G06F19/00Cooperative ClassificationH01Q25/02European ClassificationH01Q25/02Legal EventsDateCodeEventDescriptionAug 16, 2011ASAssignmentFree format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:TAENZER, JON C;SPICER, BRUCE;SIGNING DATES FROM 20110804TO 20110810;REEL/FRAME:026759/0544Owner name: DOLBY LABORATORIES LICENSING CORPORATION, CALIFORNRotateOriginal ImageGoogle Home - Sitemap - USPTO Bulk Downloads - Privacy Policy - Terms of Service - About Google Patents - Send FeedbackData provided by IFI CLAIMS Patent Services©2012 Google