Publication Details
Title: Feature extraction for automatic speech recognition
Author: B. Kingsbury, S. Greenberg, and N. Morgan
Group: Patents
Date: October 23, 2001
PDF: [Not available online]
Overview:
An automatic speech recognition apparatus and method with a front end feature extractor that improved recognition performance under adverse acoustic conditions are disclosed. The inventive feature extractor is characterized by a critical bandwidth spectral resolution, an emphasis on slow changes in the spectral structure o the speech signal, and adaptive automatic gain control. In one the feature extractor includes a feature generator configured to compute short-term parameters of the speech signal, a filter system configured to filter the time sequences of the short-term parameters, and a normalizer configured to normalize the filtered parameters with respect to one or more previous values of the filtered parameters. Accordingly, the feature extractor is operable to carry out the following steps: computing short-term parameters of the speech signal; filtering time sequences of the short-term parameters; and normalizing the filtered parameters with respect to one or more previous values of the filtered parameters. The step of filtering and normalizing preferably are performed independently of one another.
Bibliographic Information:
United States Patent 6,308,155. U.S. Class 704/256.1, 704/231, 704/251, 704/255. International Class G10L 15/00 (20060101), G10L 15/02 (20060101). Field of Search 704/206,224,225,236,234,231,251-256
Bibliographic Reference:
B. Kingsbury, S. Greenberg, and N. Morgan. Feature extraction for automatic speech recognition. United States Patent 6,308,155. U.S. Class 704/256.1, 704/231, 704/251, 704/255. International Class G10L 15/00 (20060101), G10L 15/02 (20060101). Field of Search 704/206,224,225,236,234,231,251-256, October 23, 2001
Author: B. Kingsbury, S. Greenberg, and N. Morgan
Group: Patents
Date: October 23, 2001
PDF: [Not available online]
Overview:
An automatic speech recognition apparatus and method with a front end feature extractor that improved recognition performance under adverse acoustic conditions are disclosed. The inventive feature extractor is characterized by a critical bandwidth spectral resolution, an emphasis on slow changes in the spectral structure o the speech signal, and adaptive automatic gain control. In one the feature extractor includes a feature generator configured to compute short-term parameters of the speech signal, a filter system configured to filter the time sequences of the short-term parameters, and a normalizer configured to normalize the filtered parameters with respect to one or more previous values of the filtered parameters. Accordingly, the feature extractor is operable to carry out the following steps: computing short-term parameters of the speech signal; filtering time sequences of the short-term parameters; and normalizing the filtered parameters with respect to one or more previous values of the filtered parameters. The step of filtering and normalizing preferably are performed independently of one another.
Bibliographic Information:
United States Patent 6,308,155. U.S. Class 704/256.1, 704/231, 704/251, 704/255. International Class G10L 15/00 (20060101), G10L 15/02 (20060101). Field of Search 704/206,224,225,236,234,231,251-256
Bibliographic Reference:
B. Kingsbury, S. Greenberg, and N. Morgan. Feature extraction for automatic speech recognition. United States Patent 6,308,155. U.S. Class 704/256.1, 704/231, 704/251, 704/255. International Class G10L 15/00 (20060101), G10L 15/02 (20060101). Field of Search 704/206,224,225,236,234,231,251-256, October 23, 2001