公开(公告)号：US5402230A

公开(公告)日：1995-03-28

申请号：US989640

申请日：1992-12-11

申请人： Qian Tian ,  Enyao Zhang ,  Donglei Tang ,  Akira Shimokohbe ,  Masahiro Akahane ,  Kenji Sakai

发明人： Qian Tian ,  Enyao Zhang ,  Donglei Tang ,  Akira Shimokohbe ,  Masahiro Akahane ,  Kenji Sakai

IPC分类号： G01B9/02 ,  G01D5/26

CPC分类号： G01D5/268 ,  G01B9/02002 ,  G01B9/02045 ,  G01B9/02067 ,  G01S17/325 ,  G01S7/4818 ,  G01S7/4911 ,  G01S7/4917

摘要： A heterodyne interferometric optical fiber displacement sensor using a laser diode. The frequency and the intensity of the laser diode beam are periodically modulated by an injection current. The laser diode beam is routed to a rod lens via a first optical fiber, an optical fiber coupler, and a second optical fiber. The interference light resulting from the interference between the light reflected from the exit surface of the rod lens and the light reflected from an object surface is routed to a third optical fiber via the optical fiber coupler, which is then detected by a photodiode attached to the end of the third optical fiber. From the output of the photodiode, a given frequency component is extracted using a bandpass-filter. The extracted signal is converted into a pulse signal. The frequency change of the pulse signal (equivalent to a doppler frequency shift caused by the movement of the object surface) is accumulated using an electronic circuit. Then, the accumulated value is used to calculate the displacement of the object surface.

摘要翻译： 使用激光二极管的外差干涉光纤位移传感器。 激光二极管光束的频率和强度由注入电流周期性地调制。 激光二极管光束通过第一光纤，光纤耦合器和第二光纤被路由到棒状透镜。 由从棒状透镜的出射面反射的光与从物体表面反射的光之间的干涉产生的干涉光通过光纤耦合器被路由到第三光纤，然后光纤耦合器被附接到 第三根光纤的端部。 从光电二极管的输出，使用带通滤波器提取给定的频率分量。 提取的信号被转换成脉冲信号。 使用电子电路累积脉冲信号的频率变化（相当于由物体表面的移动引起的多普勒频移）。 然后，累加值用于计算物体表面的位移。

公开(公告)号：US5056150A

公开(公告)日：1991-10-08

申请号：US433098

申请日：1989-11-08

申请人： Tiecheng Yu ,  Ning Bi ,  Meiling Rong ,  Enyao Zhang

发明人： Tiecheng Yu ,  Ning Bi ,  Meiling Rong ,  Enyao Zhang

IPC分类号： G10L15/08 ,  G10L15/10 ,  G10L25/87

CPC分类号： G10L15/10 ,  G10L25/87

摘要： A method and apparatus for real time speech recognition with and without speaker dependency which includes the following steps. Converting the speech signals into a series of primitive sound spectrum parameter frames; detecting the beginning and ending of speech according to the primitive sound spectrum parameter frame, to determine the sound spectrum parameter frame series; performing non-linear time domain normalization on the sound spectrum parameter frame series using sound stimuli, to obtain speech characteristic parameter frame series with predefined lengths on the time domain; performing amplitude quantization normalization on the speech characteristic parameter frames; comparing the speech characteristic parameter frame series with the reference samples, to determine the reference sample which most closely matches the speech characteristic parameter frame series; and determining the recognition result according to the most closely matched reference sample.

摘要翻译： 一种具有或不具有扬声器依赖性的实时语音识别的方法和装置，包括以下步骤。 将语音信号转换为一系列原始声谱参数帧; 根据原始声谱参数帧检测语音的开始和结束，确定声谱参数帧序列; 使用声音刺激对声谱参数帧序列进行非线性时域归一化，获得时域上具有预定长度的语音特征参数帧序列; 对语音特征参数帧执行振幅量化归一化; 将语音特征参数帧序列与参考样本进行比较，确定与语音特征参数帧序列最匹配的参考样本; 并根据最接近匹配的参考样本确定识别结果。