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
Method and apparatus to adjust received signal
Metal foil laminate, substrate for mounting LED, and light source device
Stackable clothes drying apparatus
Control device of hybrid vehicle
Audit planning
Position pointer, variable capacitor and inputting apparatus
Computer program, system, and method for mapping Social Security claiming strategies
  Randomly Featured Patents
Micelle-controlled nanoparticle synthesis for SERS
Process for preparing amide n-carbox-amides
Apparatus and method of transferring video data of a moving picture
Semiconductor integrated circuit design apparatus and method for analyzing a delay in a semiconductor integrated circuit
Semiconductor device having improved halo structures and a method of forming the halo structures of a semiconductor device
Tumor necrosis factor receptor polypeptides recombinant P75 (Type II)
Symbol timing recovery circuit in digital demodulator
Opaque polymeric films and processes for making the same