公开(公告)号：US4899386A

公开(公告)日：1990-02-06

申请号：US167275

申请日：1988-03-11

申请人： Masako Ichikawa ,  Yukio Mitome

发明人： Masako Ichikawa ,  Yukio Mitome

IPC分类号： G10L19/02

CPC分类号： G10L19/02

摘要： For use in deciding optimum pole and zero parameters for an input signal with reference to an input cepstrum of the signal, candidate pole and zero parameters are stored in advance in a table. Supplied with an impulse and controlled by a candidate set pair of a pole parameter set and a zero parameter set selected from the candidate pole and zero parameters of the table, first and second filters produce first and second outputs defined by terms of up to a certain order. Responsive to the first and second outputs and to factors of multiplication which are given by inverse numbers of time intervals related to the respective terms, an analysis filter produces a converted signal which is equivalent to a model output cepstrum of a model output signal produced by a pole-zero model defined by the candidate set pair. A cepstrum subtracter calculates a cepstrum difference between the input cepstrum and the converted signal. In connection with a few candidate set pairs, cepstrum differences and then squares of the respective cepstrum differences are calculated to decide the optimum pole and zero parameters by a focussing technique. Alternatively, a square of the cepstrum difference is used together with partial derivatives of the square to decide the optimum pole and zero parameters.

摘要翻译： 为了参考信号的输入倒谱来确定输入信号的最佳极点和零参数，候选极点和零参数被预先存储在表中。 由脉冲提供并由候选组对极参数组和从表的候选极和零参数中选择的零参数集进行控制，第一和第二滤波器产生由多达一定值的术语定义的第一和第二输出 订购。 分析滤波器响应于第一和第二输出以及与各个项相关的时间间隔的倒数给出的乘法因子，分析滤波器产生等效于模型输出信号的模型输出倒频谱的转换信号，该模型输出信号由 由候选集合对定义的极零模型。 倒谱减法器计算输入倒谱和转换信号之间的倒谱差。 结合几个候选集合对，计算倒谱差异，然后计算各倒谱差的平方，以通过聚焦技术来确定最佳极点和零参数。 或者，将倒谱差的平方与平方的偏导数一起使用以决定最佳极点和零参数。