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
Compressed articles with microencapsulation
Traffic and security monitoring system and method
Device message management system
Carbon transaction card
Micro-fluidic test apparatus and method
High efficiency rear lit waveguide
Touch-sensitive user interface
  Randomly Featured Patents
Ultrasound imaging method and apparatus
Dynamic web page generation method and system
Method of manufacturing a cutting member having an auxiliary layer
Radiographic image conversion panel and production method thereof
Use of diazepines for preparing medicines for treating pathological conditions or diseases involving one of the growth hormone release inhibiting factor receptors
Support assemblies for pipes, conduits and tubes
Bicycle frame construction
Semiconductor memory device with bit line sense amplifiers
Information processing system and method using time-varying database altering information
Method for coating a whole meat muscle product with a powdered mixture