专利快速检索-快速检索全球专利，免费商用专利数据库-IPRDB

1. 发明授权

US5315585A Echo canceller using two residual echoes 失效
标题翻译：回波消除器使用两个残差回波
公开(公告)号：US5315585A
公开(公告)日：1994-05-24
申请号：US053658
申请日：1993-04-29
申请人： Shigeru Iizuka , Youtaro Yatsuzuka
发明人： Shigeru Iizuka , Youtaro Yatsuzuka
IPC分类号： H04B3/23 , H04L5/14
CPC分类号： H04B3/23
摘要： In an echo canceller having PCM interfaces used in a PCM telephone circuit, an echo estimator (6) is coupled with a receive path through a linear code converter (13) for obtaining a linear receive input signal, and a first subtractor (7) is inserted after a linear code converter (13) in a transmit path for cancelling an echo component in a linear transmit input signal and for transmitting a first residual echo to the far-end talker. A non-linear quantization processor (24) is inserted between the first subtracter (7) and the echo estimator (6), and produces a new echo estimate containing quantization noise, based on an echo estimate which is derived from the echo estimator (6). The filter coefficients in the echo estimator (6) are updated by using the second residual echo obtained by the second subtracter (23) separately prepared from the first subtracter (7). The new echo estimate from the non-linear quantization processor (24) can drastically cancel not only the echo but also the quantization noise in the linear transmit input signal without any effect on the performance of the echo estimator (6). The echo canceller having the non-linear quantization processor (24) and subtracters separately prepared for transmitting the first residual echo to the far-end talker and for updating the echo estimator (6) can achieve a high echo return loss enhancement even for a multi-linked PCM channel.
摘要翻译：在具有用于PCM电话电路中的PCM接口的回声消除器中，回波估计器（6）通过线性码转换器（13）与接收路径耦合，用于获得线性接收输入信号，第一减法器（7）是插入在用于消除线性发送输入信号中的回波分量的发送路径中的线性码转换器（13）之后，并将第一残差回波发送到远端讲话者。基于从回波估计器（6）导出的回波估计，将非线性量化处理器（24）插入到第一减法器（7）和回波估计器（6）之间，并产生包含量化噪声的新回波估计）。通过使用由第一减法器（7）分别准备的由第二减法器（23）获得的第二残差回波来更新回波估计器（6）中的滤波器系数。来自非线性量化处理器（24）的新的回波估计不仅可以大大地消除线性发射输入信号中的回波而且消除量化噪声，而对回波估计器（6）的性能没有任何影响。具有非线性量化处理器（24）的回波消除器和分别准备用于将第一残余回波发送到远端讲话者并且用于更新回波估计器（6）的减法器可以实现甚至对于多个连接的PCM通道。

2. 发明授权

US4676404A Method and apparatus for feeding drug liquid from hermetic returnable can 失效
标题翻译：从密封可回收罐供给药液的方法和装置
公开(公告)号：US4676404A
公开(公告)日：1987-06-30
申请号：US660412
申请日：1984-10-12
申请人： Masahiro Yamazaki , Shigeru Iizuka , Shigemitsu Kamiya , Yoshiro Oka , Katsuhiro Fujino
发明人： Masahiro Yamazaki , Shigeru Iizuka , Shigemitsu Kamiya , Yoshiro Oka , Katsuhiro Fujino
IPC分类号： B67D7/72 , B67D5/00
CPC分类号： B67D7/72 , Y10T137/3124 , Y10T137/3127 , Y10T137/314
摘要： An apparatus for feeding a variety of doping liquid used in doping-liquid treatment processes for electronic materials such as semiconductors and precision machinery components, and a feeding monitor apparatus. More specifically, it relates to an apparatus for stably feeding the doping liquid while detecting its volume, in the case where the doping liquid is fed from a liquid-filled hermetic returnable can to the doping liquid treatment process, and a feeding monitor apparatus is connected between the returnable can and treatment process.
摘要翻译：一种用于馈送用于诸如半导体和精密机械部件的电子材料的掺杂 - 液体处理工艺中使用的各种掺杂液体的装置和馈送监视器装置。更具体地，本发明涉及一种用于在检测其体积的同时稳定地供给掺杂液体的装置，在将掺杂液体从填充液体的密封可回收罐供给到掺杂液处理工艺的情况下，连接馈送监视器装置可回收罐和处理过程之间。

3. 发明授权

US5125030A Speech signal coding/decoding system based on the type of speech signal 失效
标题翻译：基于语音信号类型的语音信号编码/解码系统
公开(公告)号：US5125030A
公开(公告)日：1992-06-23
申请号：US641634
申请日：1991-01-17
申请人： Takahiro Nomura , Yohtato Yatsuzuka , Shigeru Iizuka
发明人： Takahiro Nomura , Yohtato Yatsuzuka , Shigeru Iizuka
IPC分类号： G10L19/06
CPC分类号： G10L19/06
摘要： An input speech signal is encoded by an adaptive quantizer which quantizes the predicted residual signal between the digital input speech signal, and prediction signals provided by predictors and a shaped quantization noise provided by a noise shaping filter. An inverse quantizer, to which the encoded speech signal is supplied, is provided for noise shaping and local decoding. A noise shaping filter makes the spectrum of the quantization noise similar to that of the original digital input speech signal by using the shaping factors. The shaping factors are changed depending upon the prediction gain (ex. ratio of input speech signal to predicted residual signal or the prediction coefficients). On a decoding side of the system there are an inverse quantizer, predictors, and a post noise shaping filter. The shaping factors for the post noise shaping filter are similarly changed depending upon the prediction gain.
摘要翻译：输入语音信号由自适应量化器编码，该自适应量化器量化数字输入语音信号和由预测器提供的预测信号之间的预测残差信号以及由噪声整形滤波器提供的成形量化噪声。提供编码语音信号的反向量化器被提供用于噪声整形和局部解码。噪声整形滤波器通过使用整形因子使量化噪声的频谱与原始数字输入语音信号的频谱相似。整形因子根据预测增益（输入语音信号与预测残差信号的比例或预测系数）而变化。在系统的解码侧，存在逆量化器，预测器和后噪声整形滤波器。后噪声整形滤波器的整形因子根据预测增益而相似地改变。

4. 发明授权

US5113448A Speech coding/decoding system with reduced quantization noise 失效
标题翻译：语音编码/解码系统，减少量化噪音
公开(公告)号：US5113448A
公开(公告)日：1992-05-12
申请号：US463280
申请日：1989-12-15
申请人： Takahiro Nomura , Yohtaro Yatsuzuka , Shigeru Iizuka , Hideki Honma
发明人： Takahiro Nomura , Yohtaro Yatsuzuka , Shigeru Iizuka , Hideki Honma
IPC分类号： H03M3/04 , G10L19/04
CPC分类号： G10L19/04
摘要： An input speech signal is encoded by an adaptive quantizer device (16). The adaptive quantizer device quantizes the predicted residual signal produced by removing correlations from the digital input signal by predictors devices (6, 10). A coefficient or weighting factor, called a leakage, at the predictor device (6) is adaptively adjusted by a leakage selector device (47) depending upon a prediction gain. The prediction gain indicates the accuracy of the prediction. The value of leakage is in the range between 0 and 1, depending upon whether the speech signal is voiced sound or unvoiced sound.

你已经成功收藏专利！

检索式保存成功!

IPRDB

热门服务

关于我们

友情链接

联系方式