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
Nitride semiconductor laser device
Matching engine for comparing data feeds with user profile criteria
Vehicle control apparatus
Supply voltage generating circuit and semiconductor device having the same
Semiconductor device having vertical channel
Optical article comprising a temporary anti-fogging coating with improved durability
Optical fixing device and image forming apparatus
  Randomly Featured Patents
Seismic sensing apparatus and method with high-g shock isolation
Electrostatic chuck electrical balancing circuit repair
Fluorocarbon resin coated substrates and methods of making
Set of vehicle running boards
Visual feedback display
Orthopedic hip and leg abductor
Propoxylated alkali-soluble thickeners
Treatment of tension-type headaches with NMDA receptor antagonists
Power-off detection circuit
Plastic sheet cutter and method for installing a zipper on a sheet of material