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
Intelligent and automated code deployment
Method and system for enabling rendering of electronic media content via a secure ad hoc network configuration utilizing a handheld wireless communication device
Method and apparatuses for solving weighted planar graphs
Image decolorizing device
System and method for providing definitions
Digital camera dock having movable guide pins
Sensing during magnetic resonance imaging
  Randomly Featured Patents
Non-quadrate linerless label construction, methods of use and application
Halogenobenzimidazoles and their use as microbicides
Method for allocating HARQ channel number for indicating state information in an HSDPA communication system
Level-shift circuit, electro-optical device, and level shift method
Method and apparatus for determining the effect of temperature upon life expectancy of an electric energy storage device in a hybrid electric vehicle
Alerts by sector/news alerts
Polyether urea epoxy curing agent
Superconducting energy storage device
Joystick device with photoelectric tilt and push button detection
Hydraulic drive and steering systems for a vehicle