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
Matching geometry generation and display of mammograms and tomosynthesis images
Delay interferometer using magneto-optic effect of a variable faraday rotator
Apparatus and method of managing radio bearer in wireless communication system
Substituted di-arylhydantoin and di-arylthiohydantoin compounds and methods of use thereof
Predicting popularity of electronic publications
Treatment of influenza
Image reproduction system and image reproduction processing program
  Randomly Featured Patents
Configurable transaction routing system and method
Pumping arrangement
Structure for electrical and/or optical cable using impregnated fiber strength layer
Method and apparatus of removing weft of cord fabric for topping sheet
Curing low-k dielectrics for improving mechanical strength
Continuous/intermittent adhesive dispensing apparatus
Railroad car for loading and unloading rails
Method for inhibiting the growth of antibiotic resistant of bacteria by using pentane-1,5-diol
Receiver having a memory based search for fast acquisition of a spread spectrum signal
Blue emitting Ce.sup.3+ Activated borate phosphors used in fluorescent lamps and TV tubes and a process for synthesizing the same