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公开(公告)号：US4379949A
公开(公告)日：1983-04-12
申请号：US291648
申请日：1981-08-10
摘要： A signal exhibiting redundancy, such as speech subjected to linear predictive coding, is transmitted in a reduced bandwidth by performing a linear interpolation over a number of frames. Interpolated coefficients are tested against quantized values to see if they differ by no more than a threshold. If they do not, only the last frame is sent and intermediate values are reconstructed by interpolation. If the interpolated values differ by more than the threshold from the quantized values, the number of frames for interpolation is reduced and the interpolation is repeated. This is continued until either interpolation is successful or else the next consecutive frame is sent. The required bandwidth for transmission can be varied by varying the threshold, the maximum number of frames for interpolation, the number of LPC coefficients, or a combination of these.
摘要翻译： 通过在多个帧上执行线性插值，以减少的带宽发送呈现冗余的信号，例如经历线性预测编码的语音。 根据量化值测试插值系数，以查看它们是否不同于阈值。 如果不是，则只发送最后一帧，并通过插值重建中间值。 如果内插值与量化值相差超过阈值，则减少用于插值的帧数，并重复插值。 这一直持续到插补成功，否则发送下一个连续的帧。 用于传输的所需带宽可以通过改变阈值，用于插值的最大帧数，LPC系数的数量或它们的组合来改变。
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公开(公告)号：US5146539A
公开(公告)日：1992-09-08
申请号：US270427
申请日：1988-11-08
摘要： A speech recognizer which utilizes hypothesis testing to determine formant frequencies for use in speech recognition. A pre-processor (36) receives speech signal frames and utilizes linear predictive coding to generate all formant frequency candidates. An optimum formant selector (38) operates with a comparator (40) to select from the formant candidates those formants which best match stored reference formants. A dynamic time warper (42) and high level recognition logic (44) operate to determine whether or not to declare a recognized word.
摘要翻译： 一种语音识别器，其利用假设检验来确定在语音识别中使用的共振峰频率。 预处理器（36）接收语音信号帧并利用线性预测编码来产生所有共振峰频率候选。 最优共振峰选择器（38）与比较器（40）一起操作以从共振峰候选中选择与存储的参考共振峰最佳匹配的共振峰。 动态时间整形器（42）和高级识别逻辑（44）操作以确定是否声明识别的字。
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