[특허]Hybrid beamforming

[미국특허] Hybrid beamforming 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	H04R-003/00
출원번호	US-0402290 (2006-04-11)
등록번호	US7970151 (2011-06-15)
발명자 / 주소	Oxford, William V. Varadarajan, Vijay
출원인 / 주소	LifeSize Communications, Inc.
대리인 / 주소	Meyertons Hood Kivlin Kowert & Goetzel, P.C.
인용정보	피인용 횟수 : 7 인용 특허 : 82

초록 ▼

A system such as a speakerphone may include a processor, memory and an array of microphones. The processor may be configured (via program instructions stored in the memory) to perform automatic echo cancellation, self calibration and beam forming. In particular, the processor may receive input signals from the microphone array and operate on the input signals with a highly directed virtual beam which is a composite of two or more beams which are restricted to respective frequency ranges. The two or more beams may include beams of different kinds, e.g., superdirective beams and delay-and-sum beams.

대표청구항 ▼

What is claimed is: 1. A system comprising:a set of microphones;a memory that stores program instructions;a processor configured to read and execute the program instructions from the memory, wherein the program instructions are executable to implement:(a) receiving input signals, wherein each of the input signals is received from a corresponding one of the microphones;(b) operating on a first subset of the input signals to respectively generate first versions of the input signals in the first subset, wherein the first versions are band limited to a first frequency range, wherein the first frequency range is below a transition frequency;(c) operating on the first versions of the input signals in the first subset with a first set of beam parameters in order to compute a first output signal, wherein the first set of beam parameters corresponds to a first virtual beam having an integer-order superdirective structure;(d) operating on a second subset of the input signals to respectively generate second versions of the input signals in the second subset, wherein the second versions are band limited to a second frequency range different from the first frequency range, wherein the second frequency range is above the transition frequency, wherein the second subset includes two or more of the input signals and is not identical to the first subset of the input signals;(e) operating on the second versions of the input signals in the second subset with a second set of beam parameters in order to compute a second output signal, wherein the second set of beam parameters corresponds to a second virtual beam having a delay-and-sum structure;(f) generating a resultant signal, wherein the resultant signal includes a combination of at least the first output signal and the second output signal.

이 특허에 인용된 특허 (82) 인용/피인용 타임라인 분석

Mitchell A. Markow ; Jeremy Ford ; Ji-An Gong, Acoustic coupling compensation for a speakerphone of a system.
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Pi Sheng Chang ; Aidong Ning ; Michael G. Lambert ; Wayne J. Haas, Acoustic source location using a microphone array.
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Chu Peter L. (Needham MA), Adaptive acoustic echo canceller having means for reducing or eliminating echo in a plurality of signal bandwidths.
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David V. Anderson ; Stephen McGrath ; Kwan Truong, Adaptive filter featuring spectral gain smoothing and variable noise multiplier for noise reduction, and method therefor.
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O'Malley, William; Leondires, Arthur P., Audio conference platform system and method for broadcasting a real-time audio conference over the internet.
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O'Malley, William; Grandgent, Charles M., Audio conference platform with dynamic speech detection threshold.
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Botzko Stephen C. ; Franklin David M., Audio processor.
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Botzko Stephen C. ; Franklin David M., Audio processor.
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Epps David C. (Denver CO), Automatic gain control using root-mean-square circuitry in a digital domain conference bridge for a telephone network.
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Graumann David L., Automatic microphone calibration for video teleconferencing.
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Maeng, Joonyoul; Williams, Errol R., Automatic voice tracking camera system and method of operation.
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Crow Robert P. (4725 Bywood Ct. Colorado Springs CO 80906), Beamed linear array microphone system.
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Epps David C. (Denver CO), Circuit for nulling the talker\s speech in a conference call and method thereof.
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Faraci Philip ; Skene Jeremy F., Compact speakerphone apparatus.
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Kang, Kyeong Ok; Jang, Dae Young; Kwak, Jin Suk; Hong, Jin Woo; Kim, Sung Han; Lim, Young Kwon; Kim, Jin Woong; Popp, Harald; Geyersberger, Stefan; Fiesel, Wolfgang, Data CODEC system for computer.
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Ludwig, Lester F.; Lauwers, J. Chris; Lantz, Keith A.; Burnett, Gerald J.; Burns, Emmett R., Dedicated echo canceler for a workstation.
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Van Gerwen Petrus J. (Eindhoven NLX) van de Laar Franciscus A. M. (Eindhoven NLX) Kotmans Hendrik J. (Eindhoven NLX), Digital echo canceller.
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Paul Jon D. (2800 Third St. San Francisco CA 94107) Clayton Mark D. (Box 541 ; RD 4 New Windsor NY 12550) Agnello Anthony M. (407 Prospect Ave. Princeton NJ 08540), Digital output transducer.
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Takaaki Kishigami JP; Takashi Fukagawa JP; Makoto Hasegawa JP, Direction of arrival estimation apparatus and variable directional signal receiving and transmitting apparatus using the same.
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Lehr Michael A. ; Widrow Bernard, Directional hearing system.
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Stewart, Brett B., Directional microphone utilizing spaced apart omni-directional microphones.
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Castles,Randy; Sexton,Martin; Nimri,Alain, Graphical user interface for video feed on videoconference terminal.
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Carver, Robert W., High back-EMF high pressure subwoofer having small volume cabinet low frequency cutoff and pressure resistant surround.
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Koroljow, Walter S.; Gibian, Gary L., Hybrid adaptive beamformer.
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Elko Gary Wayne, Image-derived second-order directional microphones with finite baffle.
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Marash Joseph,ILX ; Berdugo Baruch,ILX, Interference canceling method and apparatus.
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Baxley, Warren E.; Clemson, Gregory A.; Ernstrom, William P.; Nylander, Eric J.; Stark, Thomas W.; Yackey, Jr., Thomas E., Large-scale, fault-tolerant audio conferencing in a purely packet-switched network.
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Baxley, Warren E.; Clemson, Gregory A.; Ernstrom, William P.; Nylander, Eric J.; Stark, Thomas W.; Yackey, Jr., Thomas E., Large-scale, fault-tolerant audio conferencing over a hybrid network.
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Potts, Steven L.; Wang, Hong; Rabiner, Wendi Beth; Chu, Peter L., Locating an audio source.
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Randmere Uno (Victor NY) Suntop Morris A. (Rochester NY), Loudspeaking telephone hysteresis and ambient noise control.
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Chu Peter L. (Needham MA), Method and apparatus for estimating the level of acoustic feedback between a loudspeaker and microphone.
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Chu Peter L. ; Wang Hong, Method and apparatus for localization of an acoustic source.
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Hinman Brian L. (Los Gatos CA) Huang Shan-Shan (Sunnyvale CA) Gaut Eric K. (Foster City CA), Method and apparatus for periodic signal detection.
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Aoki Mariko,JPX ; Aoki Shigeaki,JPX ; Matsui Hiroyuki,JPX ; Nishino Yutaka,JPX ; Okamoto Manabu,JPX, Method and apparatus for separation of source, program recorded medium therefor, method and apparatus for detection of sound source zone, and program recorded medium therefor.
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Chu Peter L., Method and apparatus for steerable and endfire superdirective microphone arrays with reduced analog-to-digital converter.
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Strubbe, Hugo J.; Lee, Mi-Suen, Method and apparatus for tracking moving objects using combined video and audio information in video conferencing and other applications.
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Huang Shan-Shan (Sunnyvale CA) Hinman Brian L. (Los Gatos CA) Gaut Eric K. (Palo Alto CA), Method for fail-safe operation in a speaker phone system.
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Brandstein Michael S. (Providence RI) Silverman Harvey F. (East Greenwich RI), Methods and apparatus for adaptive beamforming.
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Brandstein Michael S. ; Adcock John E. ; Silverman Harvey F., Methods and apparatus for source location estimation from microphone-array time-delay estimates.
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Ludwig ; Jr. Lester Frank, Methods and systems for multimedia communications via public telephone networks.
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Matsuo Naoshi,JPX, Microphone array apparatus.
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Rung, Martin, Microphone array with high directivity.
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Sudo, Yoshinori; Fujiwara, Noritaka, Microphone holder having connector unit molded together with conductive strips.
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Chu Peter Lee (Lexington MA) Barton William F. (Littleton MA), Microphone system for teleconferencing system.
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Chu Peter Lee ; Barton William F., Microphone system for teleconferencing system.
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Kaneda, Yutaka; Ohga, Juro, Microphone-array apparatus and method for extracting desired signal.
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Hirano Akihiro (Tokyo JPX) Sugiyama Akihiko (Tokyo JPX), Multi-channel echo canceling method and apparatus.
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Ludwig Lester F. (Foster City CA) Lauwers J. Chris (Menlo Park CA) Lantz Keith A. (Los Altos CA) Burnett Gerald J. (Atherton CA) Burns Emmett R. (Incline Village NV), Multimedia collaboration system arrangement for routing compressed AV signal through a participant site without decompre.
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Ludwig Lester F. (Foster City CA) Lauwers J. Chris (Menlo Park CA) Lantz Keith A. (Los Altos CA) Burnett Gerald J. (Atherton CA) Burns Emmett R. (Incline Village NV), Multimedia collaboration system with separate data network and A/V network controlled by information transmitting on the.
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Ludwig, Lester; Brown, William Blake; Yul, Inn J.; Vuong, Anh T.; Vanderlippe, Richard W.; Burnett, Gerald; Lauwers, Chris; Lui, Richard; Applebaum, Daniel, Networked video multimedia storage server environment.
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Andrea Douglas ; Topf Martin, Noise cancellation apparatus.
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Elko Gary W. (Summit NJ) Sondhi Man M. (Berkeley Heights NJ) West James E. (Plainfield NJ), Noise reduction processing arrangement for microphone arrays.
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Tucker, Mike; Binford, Don; Flott, Rick; Vanderwilt, Patrick; Kenoyer, Michael; Weaver, Jason C.; Manning, Earl, Personal videoconferencing system having distributed processing architecture.
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Hirai,Toru; Kawakami,Fukushi; Shimizu,Yasushi; Honji,Yoshikazu; Ikeda,Masahiro; Tohyama,Mikio, Picked-up-sound recording method and apparatus.
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Anil Wamanrao Ubale ; Grant Allen Davidson, Quantization in perceptual audio coders with compensation for synthesis filter noise spreading.
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Helf Brant M. (Melrose MA) Chu Peter L. (Lexington MA), Reduction of background noise for speech enhancement.
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Donovan, Steven R.; Devanathan, Raghavan, SIP-based feature control.
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O'Malley, William; Leondires, Arthur P., Scalable audio conference platform.
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Elko, Gary W.; Teutsch, Heinz, Second-order adaptive differential microphone array.
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Addeo Eric J. (Long Valley NJ) Robbins John D. (Denville NJ) Shtirmer Gennady (Morris Plains NJ), Sound localization system for teleconferencing using self-steering microphone arrays.
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Curry,James E.; McAllister,Alexander I.; Hatton,Patricia V., Spatial sound conference system and apparatus.
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David V. Anderson ; Stephen McGrath ; Kwan Truong, Speech activity detector for use in noise reduction system, and methods therefor.
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Elko Gary Wayne, Steerable and variable first-order differential microphone array.
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Duttweiler Donald L. (Rumson NJ), Subband echo canceler.
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Chu, Peter L.; Kenoyer, Michael; Washington, Richard, System and method for computing a location of an acoustic source.
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Marash Joseph,ILX, System and method for finding the direction of a wave source using an array of sensors.
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Shachar, Yair; Winter, Isac; Menczel, Yaron, System and method for videoconference initiation.
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Deierling Kevin, System and method for videoconferencing and simultaneously viewing a supplemental video source.
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Huang Jixiong ; Grinnell Richard S., Teleconferencing system with visual feedback.
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Davidson Grant Allen ; Robinson Charles Quito ; Truman Michael Mead, Using gain-adaptive quantization and non-uniform symbol lengths for improved audio coding.
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Helf Brant, Variable length coding using a plurality of region bit allocation patterns.
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Ippolito Peter M. ; Cook Caroline M., Video conferencing apparatus for group video conferencing.
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Gupta Prabhat K. (Germantown MD) Jangi Shrirang (Germantown MD) Lamkin Allan B. (Arlington VA) Kepley ; III W. Robert (Gaithersburg MD) Morris Adrian J. (Gaithersburg MD), Voice activity detector for speech signals in variable background noise.
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Beecroft, Troy C., Voice telephony system.
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Provencal, Paul; Forrester, Christopher M, Voice-switching device and method for multiple receivers.
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Epps, David C., Whisper circuit for a conference call bridge including talker nulling and method therefor.
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이 특허를 인용한 특허 (7) 인용/피인용 타임라인 분석

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Gygax, Otto A.; Hu, Deqing; Davis, Joseph, Integrating acoustic echo cancellation as a subsystem into an existing videoconference and telepresence system.
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Frater, Robert H., Speakerphone and/or microphone arrays and methods and systems of the using the same.
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[미국특허] Hybrid beamforming 원문보기

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