Patent ID: 6868378
Filing Date: 2005-03-15
Classification: G10L

Abstract:
1. A process for voice recognition in an acoustic signal, the process comprising a step of digitizing and chopping said acoustic signal into a string of frames of predetermined duration, a step of parameterizing said frames in such a way as to transform them into a first series of vectors of parameters in frequency domain and a step of comparing said first series of vectors of parameters with vectors of parameters of a second series, which are prerecorded in a preliminary learning step, in such a way as to achieve said voice recognition by determining a minimum distance between the vectors of the first series and particular vectors of the second series, wherein said parameterizing step comprises the following steps: calculating spectral energy of said frames by squaring and applying a consecutive string of weighting windows each associated with a determined weighting coefficient, reproducing a shape of filters characterizing a human auditory system, in such a way as to create frequency channels; logarithmically compressing energy values of signals present in said frequency channels; generating said first series of vectors of parameters in the frequency domain; and adding a predetermined shift value to said determined weighting coefficients, in such a way as to modify said step of calculating to render said voice recognition more robust in the presence of noise.