Method and apparatus for speaker recognition using lattice-ladder filters
First Claim
1. An enrollment device for enrolling a person into a speaker recognition system, said device including an LLN filter analyzer for converting said person'"'"'s voiced speech into a set of LLN filter parameters, and a storage medium for storing said LLN filter parameters for later retrieval and comparison with voiced speech of any person seeking to access said speaker recognition system.
1 Assignment
0 Petitions
Accused Products
Abstract
A method and apparatus for speech analysis and synthesis, including speaker recognition, includes a programmable lattice-ladder notch filter which may be programmed to exhibit both filter poles and filter zeros and thereby exhibit a power spectral density with a better fit to that of a speech frame such that, when energized by a selected signal sample, a more accurate regeneration of speech is achieved. The filter parameters may be reliably and systematically determined as a single solution to a mathematical analysis given a set of gain parameters matching the observed covariance data and having a prescribed set of transmission zeros. These transmission zeros may either be preselected as a design specification, or recovered from analysis of the speech data. A speech frame may be analyzed and provide a set of parameters which may be transmitted to a remote location where a synthesizer may accurately reproduce the speech frame. A method and apparatus for speaker identification, and speaker verification with a smart card are disclosed implementing the lattice-ladder notch (LLN) filter methodology.
52 Citations
27 Claims
- 1. An enrollment device for enrolling a person into a speaker recognition system, said device including an LLN filter analyzer for converting said person'"'"'s voiced speech into a set of LLN filter parameters, and a storage medium for storing said LLN filter parameters for later retrieval and comparison with voiced speech of any person seeking to access said speaker recognition system.
- 7. A speaker recognition device comprising an LLN filter analyzer for analyzing a person'"'"'s voiced speech and converting it into a set of LLN filter parameters, and a comparator for comparing at least one parameter from said voiced speech LLN filter parameters with at least one parameter from a previously determined set of LLN filter parameters to make a speaker verification or identification decision.
- 17. A speaker recognition device comprising a comparator for comparing at least one of a set of LLN filter parameters for a person'"'"'s voiced speech with at least one of a stored set of previously determined voiced speech LLN filter parameters, and an analyzer for determining whether said LLN filter parameters have sufficiently matching patterns so as to be considered to be the same.
- 20. A method for recognizing a speaker comprising the steps of converting voiced speech into a set of LLN filter parameters, and comparing at least one parameter of said LLN filter parameters with at least one parameter of a previously stored set of LLN filter parameters.
- 25. A method for enrolling a person into a group of permitted enrollees of a speaker recognition system, said method comprising the steps of converting said persons voiced speech into a set of LLN filter parameters, and storing said set of LLN filter parameters into a storage medium for later retrieval and comparison.
Specification