Resources Contact Us Home
Speech separation with microphone arrays

Image Number 12 for United States Patent #8144896.

A system that facilitates blind source separation in a distributed microphone meeting environment for improved teleconferencing. Input sensor (e.g., microphone) signals are transformed to the frequency-domain and independent component analysis is applied to compute estimates of frequency-domain processing matrices. Modified permutations of the processing matrices are obtained based upon a maximum magnitude based de-permutation scheme. Estimates of the plurality of source signals are provided based upon the modified frequency-domain processing matrices and input sensor signals. Optionally, segments during which the set of active sources is a subset of the set of all sources can be exploited to compute more accurate estimates of frequency-domain mixing matrices. Source activity detection can be applied to determine which speaker(s), if any, are active. Thereafter, a least squares post-processing of the frequency-domain independent components analysis outputs can be employed to adjust the estimates of the source signals based on source inactivity.

  Recently Added Patents
PMI feedback with codebook interpolation
Decoration holder
Array substrate including thin film transistor and method of fabricating the same
High conductive water-based silver ink
Wafer level packaging structure with large contact area and preparation method thereof
Fast port switching in an audiovisual receiver by use of port pre-authentication by a partial PHY decoder core
Integrated circuit packaging system with an encapsulation and method of manufacture thereof
  Randomly Featured Patents
Method for intraluminally inducing cardioplegic arrest and catheter for use therein
Systems and methods for providing a dynamic memory bank page policy
Cable connector having strain relief
Use of surfactants in alumina precipitation in the bayer process
Systems and methods for operating fluid ejection systems using a print head preparatory firing sequence
Electrophotographic photosensitive member, process cartridge, and electrophotographic apparatus
Folding cart
System and method for coordinating movement of mobile drive units
Chemical-mechanical polishing methods
Scroll machine sound attenuation