Communications – electrical: acoustic wave systems and devices – Distance or direction finding – With beam steering – scanning – or focussing
Reexamination Certificate
2005-06-28
2005-06-28
Pihulic, Daniel (Department: 3662)
Communications, electrical: acoustic wave systems and devices
Distance or direction finding
With beam steering, scanning, or focussing
Reexamination Certificate
active
06912178
ABSTRACT:
In accordance with the present invention, a system and method for computing a location of an acoustic source is disclosed. The method includes steps of processing a plurality of microphone signals in frequency space to search a plurality of candidate acoustic source locations for a maximum normalized signal energy. The method uses phase-delay look-up tables to efficiently determine phase delays for a given frequency bin number k based upon a candidate source location and a microphone location, thereby reducing system memory requirements. Furthermore, the method compares a maximum signal energy for each frequency bin number k with a threshold energy Et(k) to improve accuracy in locating the acoustic source.
REFERENCES:
patent: 4688045 (1987-08-01), Knudsen
patent: 5465302 (1995-11-01), Lazzari et al.
patent: 5778082 (1998-07-01), Chu et al.
Harvey F. Silverman et al., “The Huge Microphone Array (HMA),” May 1996 (published at http://www.lems.brown.edu/array/papers/).
Douglas E. Sturim et al., “Tracking Multiple Talkers Using Microphone Array Measurements,” (Apr. 1997) (published at http://www.lems.brown.edu/array/papers/).
Michael S. Brandstein et al., “A Robust Method for Speech Signal Time-Delay Estimation in Reverberant Rooms,” (Apr. 1997) (published at http://www.lems.brown.edu/array/papers/).
Michael S. Brandstein et al., “A Closed-Form Location Estimator for Use with Room Environment Microphone Arrays,” (Jan. 1997) (published at http://www.lems.brown.edu/array/papers/).
Michael S. Brandstein et al., “A Closed-Form Method for Finding Source Locations From Microphone-Array time-Delay Estimates,” (Jan. 1997) (published at http://www.lems.brown.edu/array/papers/).
John E. Adcock, “Optimal Filtering And Speech Recognition With Microphone Arrays,” Doctotal Thesis, Brown University (May 2001) (published at http://www.lems.brown.edu/array/papers/).
Michael S. Brandstein et al., “Microphone Array Localization Error Estimation with Application to Sensor Placement” (Jun. 1996) (published at http://www.lems.brown.edu/array/papers/).
J. Adcock et al., “Practical Issues in the Use of a Frequency-Domain Delay Estimator for Microphone-Array Applications” (Nov. 1994) (published at http://www.lems.brown.edu/array/papers/).
M.S. Brandstein et al., “A Practical Time-Delay Estimator for Localizing Speech Sources with a Microphone Array” (Sep. 1995) (published at http://www.lems.brown.edu/array/papers/).
M.S. Brandstein, Abstract of“A Framework for Speech Source Localization Using Sensor Arrays,” Doctoral Thesis, Brown University (May 1995) (published at http://www.lems.brown.edu/array/papers/).
Paul C. Meuse et al., “Characterization of Talker Radiation Pattern Using a Microphone-Array” (May 1994) (published at http://www.lems.brown.edu/array/papers/).
M.S. Brandstein et al., “A Localization-Error Based Method for Microphone-Array Design” (May 1996) (published at http://www.lems.brown.edu/array/papers/).
John E. Adcock, “Microphone-Array Speech Recognition via Incremental MAP Training,” (May 1996) (published at http://www.lems.brown.edu/array/papers/).
Michael Brandstein & Darren Ward (eds.), “Microphone Arrays: Signal Processing Techniques and Applications,” pp. 157-201 (Springer, 2001).
Various materials regarding Aethra's Vega Star Gold product, downloaded from www.if2000.de/daten/ae/vi/vegastargolden.pdf (Jun. 2003) and www.aethra.com/eng/productsservices/videocommunication/vegastargold.asp.
“Intelligent Working Spaces,” Chapter 5 (2002) (downloaded from www.itc.it/abstracts2002/chapter5.pdf).
Various materials regarding Vtel's “SmartTrak” product (1998), downloaded from www.vtel.com/support/catchall/smrtraks.htm; www.vtel.com/support/catchall/smarttra.htm; www.vtel.com/support/catchall/strakgde.htm; and www.vtel.com/support/catchall/strakins.htm.
Information regarding PictureTel's Limelight product (1998), downloaded from www.polycom.com/common/pw_item_show_doc/0,1449,538,00.pdf.
PictureTel's “Concorde 4500 and System 4000EX/ZX Troubleshooting Guide” (1997), downloaded from www.polycom.com/common/pw_item_show_doc/0,1449,444,00.pdf.
PictureTel's “Concorde 4500 Software Version 6.11 Release Bulletin” (1996), downloaded from www.polycom.com/common/pw_item_show_doc/0,1449,438,00.pdf.
PictureTel's “Venue2000 User's Notebook” (1999), downloaded from www.polycom.com/common/pw_item_show_doc/0,1449,675,00.pdf.
Information regarding PictureTel's 760XL Videoconferencing System (2000), downloaded from www.polycom.com/common/pw_item_show_doc/0,1449,427,00.pdf.
Chu Peter L.
Kenoyer Michael
Washington Richard
Pihulic Daniel
Polycom, Inc.
Wong Cabello Lutsch Rutherford & Brucculeri LLP
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