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1. 发明授权

US5684922A Encoding and decoding apparatus causing no deterioration of sound quality even when sine-wave signal is encoded 失效
标题翻译：即使正弦波信号被编码也不会导致声音质量恶化的编码和解码装置
公开(公告)号：US5684922A
公开(公告)日：1997-11-04
申请号：US344166
申请日：1994-11-23
申请人： Harumitsu Miyakawa , Shuichi Kawama
发明人： Harumitsu Miyakawa , Shuichi Kawama
IPC分类号： G10L19/00 , G10L19/02 , H03M7/30 , H04B1/66 , H04B14/04 , G10L9/00
CPC分类号： H04B1/665 , G10L19/0212 , G10L19/002 , G10L19/10
摘要： There is provided an encoding and decoding apparatus which can provide a high quality of reproduction of sound. There are provided an encoding section and a decoding section. A block length determining section of the encoding section time-sharingly divides an input signal into blocks having a block length corresponding to the degree of change of the input signal. A frequency band dividing section divides the signal of each block into a plurality of frequency bands. A bit allocating section obtains a masking threshold value-to-noise ratio of each frequency band from the magnitude of the power of each frequency band reflecting a psychoacoustic characteristic, and determines the number of quantization bits to be allocated to each frequency band based on the magnitude of the masking threshold value-to-noise ratio. A quantizing section generates a code string by quantizing the signal while allocating a specified amount of bits to each frequency band based on information from the bit allocating section. The bit allocating section receives information representing the block length from the block length determining section, and adopts a different psychoacoustic characteristic depending upon the block length.
摘要翻译：提供了可以提供高质量的再现声音的编码和解码装置。提供了编码部分和解码部分。编码部分的块长度确定部分将输入信号分时地分成具有与输入信号的变化程度相对应的块长度的块。频带分割部将各块的信号分割为多个频带。比特分配部分从反映心理声学特性的每个频带的功率的大小获得每个频带的掩蔽阈值 - 噪声比，并且基于该频带确定要分配给每个频带的量化比特的数量屏蔽阈值 - 噪声比的大小。量化部分基于来自比特分配部分的信息，通过量化信号同时向每个频带分配指定量的比特来产生代码串。位分配部分从块长度确定部分接收表示块长度的信息，并且根据块长度采用不同的心理声学特性。

2. 发明申请

US20080186076A1 Level detector, communication apparatus, and tuner 审中-公开
标题翻译：电平检测器，通信设备和调谐器
公开(公告)号：US20080186076A1
公开(公告)日：2008-08-07
申请号：US11976857
申请日：2007-10-29
申请人： Shuichi Kawama
发明人： Shuichi Kawama
IPC分类号： G06G7/18 , H04B7/00
CPC分类号： G06G7/18 , H04B17/318
摘要： A level detector includes a comparing circuit and an integrating circuit. The comparing circuit generates pulses each having its width corresponding to the length of a time period during which the strength of an input signal is higher than a reference value. Alternatively, the comparing circuit may generate pulses each having its width corresponding to the length of a time period during which the strength of the input signal is lower than the reference value. The comparing circuit successively outputs the pulses. The integrating circuit outputs a signal having its strength corresponding to an integration value obtained by temporally integrating the signal from the comparing circuit.
摘要翻译：电平检测器包括比较电路和积分电路。比较电路产生各自具有对应于输入信号的强度高于参考值的时间段的长度的脉冲。或者，比较电路可以产生每个具有对应于输入信号的强度低于参考值的时间段的长度的宽度的脉冲。比较电路连续输出脉冲。积分电路输出其强度对应于通过对来自比较电路的信号进行时间积分而获得的积分值的信号。

3. 发明授权

US5361323A Signal encoding device 失效
标题翻译：信号编码装置
公开(公告)号：US5361323A
公开(公告)日：1994-11-01
申请号：US800938
申请日：1991-11-29
申请人： Yasumoto Murata , Shuichi Yoshikawa , Yuji Nishiwaki , Shuichi Kawama , Tomokazu Morio , Atsunori Kitoh
发明人： Yasumoto Murata , Shuichi Yoshikawa , Yuji Nishiwaki , Shuichi Kawama , Tomokazu Morio , Atsunori Kitoh
IPC分类号： G10L19/00 , G10L19/02 , H03M7/30 , G10L9/18
CPC分类号： G10L19/038 , G10L19/0018 , H03M7/3082
摘要： In a signal encoding device, a voice signal is divided into subsignals each comprising a predetermined number of successive samples, and data trains are generated by giving initial values to a recurrence equation. The generated data trains are divided into patterns each comprising the same number of samples as the predetermined number. The distance between each pattern produced by the pattern dividing unit and each of the subsignals are calculated. The pattern that provides the smallest distance with respect to each of the subsignals is identified, and the initial value set in the recurrence equation for generation of the data train that constitutes the pattern is output as coded data representing the respective subsignal.
摘要翻译：在信号编码装置中，语音信号被分割成各自包含预定数量的连续采样的子信号，并且通过给出递归方程给出初始值来生成数据列。生成的数据列被划分为各自包含与预定数量相同数量的样本的模式。计算由图案划分单元产生的每个图案与每个子信号之间的距离。识别相对于每个子信号提供最小距离的图案，并且在构成图案的数据串的生成的递归方程中设置的初始值作为表示各个子信号的编码数据输出。

4. 发明授权

US07346327B2 Wireless receiving circuit and wireless portable device 失效
标题翻译：无线接收电路和无线便携式设备
公开(公告)号：US07346327B2
公开(公告)日：2008-03-18
申请号：US11062447
申请日：2005-02-22
申请人： Shuichi Kawama , Kunihiko Iizuka
发明人： Shuichi Kawama , Kunihiko Iizuka
IPC分类号： H04B1/10
CPC分类号： H04B1/30 , H04B1/10
摘要： A wireless receiving circuit includes a mixer, a buffer, an active low-pass filter, and a second order passive low-pass filter which are connected between a signal input terminal and a signal output terminal. The second order passive low-pass filter is for removing an interfering wave that cannot be removed by the active low-pass filter. In the wireless receiving circuit, a first capacitor and a second capacitor are provided. The first capacitor has one terminal connected to an input terminal of the buffer and the other terminal grounded. The second capacitor has one terminal connected to an output terminal of the buffer and the other terminal grounded. These two kinds of capacitors function as the second order passive low-pass filter by being combined with input and output impedance of elements provided on the upstream side and downstream side of the capacitors. Thus provided are (i) a wireless receiving circuit that can be integrated into an integrated circuit, can reduce power consumption, and can be designed easily, and (ii) a wireless portable device using the wireless receiving circuit.
摘要翻译：无线接收电路包括连接在信号输入端和信号输出端之间的混频器，缓冲器，有源低通滤波器和二阶无源低通滤波器。二阶无源低通滤波器用于去除由有源低通滤波器无法去除的干扰波。在无线接收电路中，设置有第一电容器和第二电容器。第一个电容器有一个端子连接到缓冲器的输入端子，另一个端子接地。第二个电容器有一个端子连接到缓冲器的输出端子，另一个端子接地。这两种电容器通过与设置在电容器的上游侧和下游侧的元件的输入和输出阻抗相结合而用作二阶无源低通滤波器。这样提供的是（i）可以集成到集成电路中的无线接收电路，可以降低功耗，并且可以容易地设计，以及（ii）使用无线接收电路的无线便携式设备。

5. 发明授权

US5506934A Post-filter for speech synthesizing apparatus 失效
标题翻译：语音合成装置的后置滤波器
公开(公告)号：US5506934A
公开(公告)日：1996-04-09
申请号：US253990
申请日：1994-06-03
申请人： Shuichi Kawama
发明人： Shuichi Kawama
IPC分类号： G10L19/00 , G10L13/00 , G10L19/14 , G10L21/02 , G01L9/00
CPC分类号： G10L19/26
摘要： A post-filter adapted to be used for a speech synthesizing apparatus includes a filtering unit for filtering a synthesized signal, and a scaling coefficient in accordance with both the synthesized signal and a signal output from the filtering unit. The post filter also includes an amplitude detecting unit for detecting an amplitude of the signal output from the filtering unit and for adjusting a value of the scaling coefficient in accordance with a detected result so that an amplitude of the signal output from the filtering unit is kept within a predetermined amplitude value. The post filter further includes a multiplier for calculating the filtering unit with the adjusted scaling coefficient.
摘要翻译：适用于语音合成装置的后置滤波器包括滤波单元，用于对合成信号进行滤波，以及根据合成信号和从滤波单元输出的信号两者的缩放系数。后置滤波器还包括振幅检测单元，用于检测从滤波单元输出的信号的幅度，并根据检测结果调整缩放系数的值，使得从滤波单元输出的信号的幅度保持在预定振幅值内。后置滤波器还包括用于利用调整的缩放系数计算滤波单元的乘法器。

6. 发明申请

US20050186935A1 Wireless receiving circuit and wireless portable device 失效
标题翻译：无线接收电路和无线便携式设备
公开(公告)号：US20050186935A1
公开(公告)日：2005-08-25
申请号：US11062447
申请日：2005-02-22
申请人： Shuichi Kawama , Kunihiko Iizuka
发明人： Shuichi Kawama , Kunihiko Iizuka
IPC分类号： H04B1/26 , H04B1/10 , H04B1/30 , H04B1/46 , H04M1/00
CPC分类号： H04B1/30 , H04B1/10
摘要： A wireless receiving circuit includes a mixer, a buffer, an active low-pass filter, and a second order passive low-pass filter which are connected between a signal input terminal and a signal output terminal. The second order passive low-pass filter is for removing an interfering wave that cannot be removed by the active low-pass filter. In the wireless receiving circuit, a first capacitor and a second capacitor are provided. The first capacitor has one terminal connected to an input terminal of the buffer and the other terminal grounded. The second capacitor has one terminal connected to an output terminal of the buffer and the other terminal grounded. These two kinds of capacitors function as the second order passive low-pass filter by being combined with input and output impedance of elements provided on the upstream side and downstream side of the capacitors. Thus provided are (i) a wireless receiving circuit that can be integrated into an integrated circuit, can reduce power consumption, and can be designed easily, and (ii) a wireless portable device using the wireless receiving circuit.
摘要翻译：无线接收电路包括连接在信号输入端和信号输出端之间的混频器，缓冲器，有源低通滤波器和二阶无源低通滤波器。二阶无源低通滤波器用于去除由有源低通滤波器无法去除的干扰波。在无线接收电路中，设置有第一电容器和第二电容器。第一个电容器有一个端子连接到缓冲器的输入端子，另一个端子接地。第二个电容器有一个端子连接到缓冲器的输出端子，另一个端子接地。这两种电容器通过与设置在电容器的上游侧和下游侧的元件的输入和输出阻抗相结合而用作二阶无源低通滤波器。这样提供的是（i）可以集成到集成电路中的无线接收电路，可以降低功耗，并且可以容易地设计，以及（ii）使用无线接收电路的无线便携式设备。

7. 发明授权

US06788736B1 Matched filter 失效
标题翻译：匹配过滤器
公开(公告)号：US06788736B1
公开(公告)日：2004-09-07
申请号：US09375363
申请日：1999-08-17
申请人： Shuichi Kawama , Kunihiko Iizuka
发明人： Shuichi Kawama , Kunihiko Iizuka
IPC分类号： H04B1707
CPC分类号： H03H17/0254
摘要： A matched filter for inversely spreading a received signal using spreading signals in a spread spectrum communications receiver includes: a plurality of correlators for determining cross-correlation functions of a received signal which has been sampled at a certain timing and spreading signals having a certain section length; a delay circuit for successively transferring the spreading signals having a certain section length with respect to the plurality of correlating means by delaying timings of the transfer by a period equal to the section length of the spreading signals; and a multiplexer for successively selecting one of the cross-correlation functions outputted from the plurality of correlating means, by a period equal to a sampling interval of the received signal. As a result, a matched filter with a small circuit size and low power consumption is realized.
摘要翻译：一种用于在扩展频谱通信接收机中使用扩展信号对接收信号进行反扩展的匹配滤波器包括：多个相关器，用于确定已经在特定定时采样的接收信号的互相关函数，以及具有一定截面长度的扩展信号 ; 延迟电路，用于通过将所述传送的定时延迟等于所述扩展信号的区间长度的周期，连续地传送具有相对于所述多个相关装置的一定区间长度的扩展信号; 以及多路复用器，用于连续地选择从多个相关装置输出的互相关函数之一等于接收信号的采样间隔的周期。结果，实现了具有小电路尺寸和低功耗的匹配滤波器。

8. 发明授权

US5016279A Speech analyzing and synthesizing apparatus using reduced number of codes 失效
标题翻译：语音分析与合成设备使用减少代码数量
公开(公告)号：US5016279A
公开(公告)日：1991-05-14
申请号：US395204
申请日：1989-08-16
申请人： Shuichi Kawama , Yoshiji Fujimoto
发明人： Shuichi Kawama , Yoshiji Fujimoto
IPC分类号： H04B14/04 , G10L19/00 , H03M3/04 , H03M7/36 , H04B14/06
CPC分类号： H03M3/04 , H03M7/3044 , H03M7/3046
摘要： A speech analyzing and synthesizing apparatus samples a speech signal and its coding section outputs one or more codes of variable length per sampling according to the differential value between two mutually adjacent sampled signals to represent this differential value. The apparatus also includes a decoding section which decodes the outputted codes to obtain the differential value and a limiting circuit for limiting the number of outputtable codes per sample according to the differential value and codes representing differential values previously outputted from the coding section.
摘要翻译：语音分析合成装置对语音信号进行采样，其编码部根据两个相互相邻的采样信号之间的差分值输出一个或多个可变长度的采样码，以表示该差分值。该装置还包括解码部分，其对输出的代码进行解码以获得差分值;以及限制电路，用于根据差分值限制每个样本的可输出代码的数量，以及表示从编码部分预先输出的差分值的代码。

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