Speech recognition method and speech recognition apparatus
    1.
    发明公开
    Speech recognition method and speech recognition apparatus 有权
    Verfahren und Vorrichtung zur Spracherkennung

    公开(公告)号:EP0911805A2

    公开(公告)日:1999-04-28

    申请号:EP98120007.4

    申请日:1998-10-22

    IPC分类号: G10L3/00

    摘要: A speech recognition method of recognizing an input speech in a noisy environment by using a plurality of clean speech models is provided. Each of the clean speech models has a clean speech feature parameter S representing a cepstrum parameter of a clean speech thereof. The speech recognition method has the processes of: detecting a noise feature parameter N representing a cepstrum parameter of a noise in the noisy environment, immediately before the input speech is input; detecting an input speech feature parameter X representing a cepstrum parameter of the input speech in the noisy environment; calculating a modified clean speech feature parameter Y according to a following equation: Y = k · S + (1-k) · N (0 where the "k" is a predetermined value corresponding to a signal-to-noise ratio in the noise environment; comparing the input speech feature parameter X with the modified clean speech feature parameter Y; and recognizing the input speech by repeatedly carrying out the calculating process and the comparing process with respect to the plurality of clean speech models.

    摘要翻译: 提供了一种通过使用多个清晰语音模型在噪声环境中识别输入语音的语音识别方法。 每个清洁语音模型具有表示其干净语音的倒谱参数的干净的语音特征参数S。 语音识别方法具有以下处理:在输入语音输入之前,检测表示噪声环境中的噪声的倒谱参数的噪声特征参数N; 在噪声环境中检测表示输入语音的倒谱参数的输入语音特征参数X; 根据以下等式计算经修改的干净语音特征参数Y:其中“k”是对应于噪声环境中的信噪比的预定值; 将输入语音特征参数X与修改后的清晰语音特征参数Y进行比较; 以及通过反复执行关于多个清洁语音模型的计算处理和比较处理来识别输入语音。