Method and device for discriminating voiced and unvoiced sounds
First Claim
1. A method for discriminating a digital speech sound comprising dividing digital speech signals into blocks each consisting of a predetermined number of samples, and making a decision for each of said blocks as to whether or not the speech sound is voiced, said method further comprising the steps ofdividing signals of said block into plural sub-blocks,analyzing said sub-blocks for finding statistical characteristics of each of said sub-blocks,calculating a bias of said statistical characteristics of said signals in the time domain for enabling a block voiced/unvoiced decision, anddeciding whether said signal blocks are voiced based on said bias of said statistical characteristics in the time domain.
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Abstract
A method and a device for discriminating a voiced sound from an unvoiced sound or background noise in speech signals are disclosed. Each block or frame of input speech signals is divided into plural sub-blocks and the standard deviation, effective value or the peak value is detected in a detection unit for detecting statistical characteristics from one sub-block to another. A bias detection unit detects a bias on the time scale of the standard deviation, effective value or the peak value to decide whether the speech signals are voiced or unvoiced from one block to another.
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Citations
14 Claims
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1. A method for discriminating a digital speech sound comprising dividing digital speech signals into blocks each consisting of a predetermined number of samples, and making a decision for each of said blocks as to whether or not the speech sound is voiced, said method further comprising the steps of
dividing signals of said block into plural sub-blocks, analyzing said sub-blocks for finding statistical characteristics of each of said sub-blocks, calculating a bias of said statistical characteristics of said signals in the time domain for enabling a block voiced/unvoiced decision, and deciding whether said signal blocks are voiced based on said bias of said statistical characteristics in the time domain.
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8. An apparatus for discriminating a digital speech sound by dividing digital speech signals into blocks each consisting of a predetermined number of samples, and making a decision whether or not the speech sound is voiced for each of said blocks, said apparatus comprising
means for dividing signals of said block into plural sub-blocks, means for finding statistical characteristics of signals of each of said sub-blocks, means for finding a bias in the time domain of statistical characteristics of signals outputted from said means for finding statistical characteristics of signals of each of said sub-blocks, and means for deciding whether said signals of said blocks are voiced based on bias data outputted from said means for finding a bias.
Specification