US 6,983,245 B1 | ||
Weighted spectral distance calculator | ||
Alberto Jimenez Felstrom, Löberöd (Sweden); and Jim Rasmusson, Vellinge (Sweden) | ||
Assigned to Telefonaktiebolaget LM Ericsson (publ), Stockholm (Sweden) | ||
Filed on Jun. 07, 2000, as Appl. No. 9/588,629. | ||
Claims priority of application No. 9902103 (SE), filed on Jun. 07, 1999. | ||
Int. Cl. G10L 15/08 (2006.01) |
U.S. Cl. 704—238 | 28 Claims |
1. A speech recognition system, comprising:
a spectral distance calculator including;
a calculator for performing a spectral distance calculation comparing an input spectrum of an input signal in the presence
of a first known noise signal used to perform a function unrelated to speech recognition and a reference spectrum;
a memory for pre-storing one or more noise spectrums of one or more known noise signals including the first known noise signal;
and
masking circuitry for masking the spectral distance between the input spectrum and the reference spectrum using the pre-stored
noise spectrum of the first known noise signal, and
a selector for selecting a reference spectrum minimizing a spectral distance between the input spectrum and the reference
spectrum.
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