-
公开(公告)号：US5113448A
公开(公告)日：1992-05-12
申请号：US463280
申请日：1989-12-15
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.
-
公开(公告)号：US4811396A
公开(公告)日：1989-03-07
申请号：US675794
申请日：1984-11-28
申请人： Yohtaro Yatsuzuka
发明人： Yohtaro Yatsuzuka
CPC分类号： G10L19/06
摘要： A speech signal coding system comprises a prediction filter coupled with an output of a quantizer for prediction of a signal. A subtractor provides the difference between an input signal and an output of the prediction filter. A quantizer quantizes the residual signal, which is the difference provided by the subtractor. The quantizer is improved by adaptively adjusting step size for quantization. Thus, the coded outputs, according to the present invention, are the parameter information of the prediction filter, quantized output of the residual signal, and step information for quantization. The quantization step is determined according to the fundamental step size which provides the statistical variance, equal to one, to the quantized signal, and/or the power of the residual signal. Because of an efficient encoding with an adaptive control of the quantization step, the bandwidth for transmission of the coded signal in a communication system or transmission rate of coded speech signal is minimized. Excellent speech is reproduced through a narrow band channel, or low bit rate digital channel like 16 kbits/second digital channel.
摘要翻译： 语音信号编码系统包括与用于预测信号的量化器的输出耦合的预测滤波器。 减法器提供输入信号和预测滤波器的输出之间的差异。 量化器量化残差信号，这是减法器提供的差异。 通过自适应地调整量化步长来改进量化器。 因此，根据本发明的编码输出是预测滤波器的参数信息，残差信号的量化输出和用于量化的步长信息。 根据向量化信号提供等于1的统计方差和/或剩余信号的功率的基本步长确定量化步长。 由于利用量化步骤的自适应控制进行有效的编码，所以在通信系统中传输编码信号的带宽或编码语音信号的传输速率被最小化。 优良的语音通过窄带信道或低比特率数字信道（如16千比特/秒数字信道）再生。
-
公开(公告)号：US4757517A
公开(公告)日：1988-07-12
申请号：US31393
申请日：1987-03-27
申请人： Yohtaro Yatsuzuka
发明人： Yohtaro Yatsuzuka
IPC分类号： H04B14/04 , G01L7/00 , G10L19/06 , G10L19/14 , G10L21/02 , H03M3/00 , H03M7/30 , H04B1/66 , H04B14/02
CPC分类号： G10L19/06 , G10L19/24 , G10L21/038
摘要： A system for transmitting a voice signal is disclosed, in which an input voice signal is predivided into low- and high- frequency residual signals. The low-frequency residual signal is transmitted in the form of waveform codes with higher possible fidelity and lower possible quality deterioration through utilization of the Adaptive Predicture Coding (APC) system or Multi Pulse Excited Coding (MPEC) system, while information on the short-time high-frequency spectrum is extracted from the high-frequency residual signal and is transmitted as information for use in the reproduction of the voice signal on the receiving side.
摘要翻译： 公开了一种用于发送语音信号的系统，其中将输入语音信号预先分成低频和高频残余信号。 通过使用自适应预测图像编码（APC）系统或多脉冲激励编码（MPEC）系统，低频残留信号以更高可能的保真度和较低的可能的质量劣化的波形形式的形式发送， 从高频残留信号中提取时间高频谱，作为用于接收侧的语音信号的再现的信息而被发送。
-
公开(公告)号：US4341438A
公开(公告)日：1982-07-27
申请号：US153968
申请日：1980-05-28
申请人： Norio Seki , Yohtaro Yatsuzuka , Haruo Sakaguchi
发明人： Norio Seki , Yohtaro Yatsuzuka , Haruo Sakaguchi
CPC分类号： H04J14/0295 , H04B10/032
摘要： The operational reliability of a light source in an optical communication system has been increased by an improved redundant arrangement of light sources and the switching arrangement of the same. The present light source arrangement comprises a plurality of light sources each of which provides a different wavelength from one another, an electrical switch for actuating the selected one of the light sources, said electrical switch being arranged to replace the actuated light source when there is something wrong with the light source in operation, and an optical multiplexer the input of which is coupled to the outputs of the light sources, and the output of the optical multiplexer is connected to an optical fiber cable.
摘要翻译： 光通信系统中的光源的操作可靠性已通过改进的光源的冗余布置及其切换布置而增加。 本光源装置包括多个光源，每个光源彼此之间提供不同的波长，用于致动所选择的一个光源的电开关，所述电开关被布置成当存在某些东西时更换致动光源 操作中的光源错误，以及其输入端耦合到光源的输出的光复用器，并且光复用器的输出连接到光纤电缆。
-
公开(公告)号：US4303803A
公开(公告)日：1981-12-01
申请号：US71255
申请日：1979-08-30
申请人： Yohtaro Yatsuzuka
发明人： Yohtaro Yatsuzuka
CPC分类号： H04J3/172
摘要： A digital speech interpolation system is combined with an adaptive differential PCM (ADPCM), employing a speech detector for detecting speech signals and for discriminating voiced and unvoiced sounds. An adaptive quantization bit assignment to the speech is adopted to cope with any freeze-out condition. And further PCM speech signals with 8 KHz sampling are applied to ADPCM after shifted 250 Hz down and then converted into 6 KHz sampling frequency, thereby attaining a total gain of about 7 without degrading speech quality.
摘要翻译： 数字语音插值系统与自适应差分PCM（ADPCM）组合，采用语音检测器来检测语音信号并用于区分有声和无声的声音。 采用语音自适应量化比特分配来解决任何冻结状况。 并且在偏移250Hz之后，进一步将具有8KHz采样的PCM语音信号应用于ADPCM，然后转换成6KHz采样频率，从而达到约7的总增益，而不降低语音质量。
-
公开(公告)号：US4281416A
公开(公告)日：1981-07-28
申请号：US72283
申请日：1979-09-04
申请人： Norio Seki , Yohtaro Yatsuzuka , Haruo Sakaguchi
发明人： Norio Seki , Yohtaro Yatsuzuka , Haruo Sakaguchi
IPC分类号： H04B10/03 , G02B6/00 , H04B3/00 , H04B3/36 , H04B10/032 , H04B10/077 , H04B10/29 , H04N9/00
CPC分类号： H04B10/032
摘要： An optical transmission repeater with high operational reliability comprises of a plurality of light sources for transmitting an optical energy into an optical fiber, an optical connector for introducing the optical energy from each of said light sources to an optical transmission line, and a switching circuit for selectively operating only one light source. When a light source in operation is deteriorated, the light source in operation is switched to another light source by said switch. Thus, high operational reliability of an optical repeater is obtained although each of light sources have a low operational reliability.
摘要翻译： 具有高操作可靠性的光传输中继器包括用于将光能发射到光纤中的多个光源，用于将来自每个所述光源的光能引入光传输线的光连接器，以及用于 选择性地仅操作一个光源。 当操作中的光源劣化时，通过所述开关将操作中的光源切换到另一光源。 因此，尽管每个光源具有低的操作可靠性，但是获得了光中继器的高操作可靠性。
-
公开(公告)号：US5128625A
公开(公告)日：1992-07-07
申请号：US581820
申请日：1990-09-12
申请人： Yohtaro Yatsuzuka , Takuro Muratani
发明人： Yohtaro Yatsuzuka , Takuro Muratani
IPC分类号： H03L7/06 , H03L7/099 , H03L7/10 , H04L27/22 , H04L27/227
CPC分类号： H03L7/10 , H03L7/0991
摘要： A phase lock loop for a digital input signal has a phase detector, a loop filter, a digital voltage controlled oscillator (VCO), an initial phase difference calculator, a center frequency difference calculator and an input buffer memory. In an initial training mode prepared in the PLL operation, an optimum initial phase and an optimum center frequency of the VCO to complete a lock-in state is searched for the input signal stored in the buffer memmory. By estimating the initial phase difference and the center frequency difference between the input signal and the VCO output with repetative kick-offs in calculators, optimum values mentioned above are obtained. In a normal operation mode as a second mode in which the PLL operates normally as a conventional PLL, a phase lock operation between the VCO outut as the reference signal and the input signal in the buffer memory is carried out after the PLL is kicked off with the optimum initial phase and the optimum center frequency determined in the initial training mode.
摘要翻译： 用于数字输入信号的锁相环具有相位检测器，环路滤波器，数字压控振荡器（VCO），初始相位差计算器，中心频率差计算器和输入缓冲存储器。 在PLL操作中准备的初始训练模式中，搜索用于完成锁定状态的VCO的最佳初始相位和最佳中心频率以存储在缓冲器存储器中的输入信号。 通过在计算器中通过重复启动来估计输入信号和VCO输出之间的初始相位差和中心频率差，获得上述最佳值。 在作为常规PLL正常工作的第二模式的正常操作模式中，作为参考信号的VCO停止与缓冲存储器中的输入信号之间的锁相操作在PLL被启动之后执行， 在初始训练模式中确定最佳初始相位和最佳中心频率。
-
公开(公告)号：US4369523A
公开(公告)日：1983-01-18
申请号：US158344
申请日：1980-06-10
申请人： Norio Seki , Yohtaro Yatsuzuka , Haruo Sakaguchi
发明人： Norio Seki , Yohtaro Yatsuzuka , Haruo Sakaguchi
IPC分类号： H04B1/74 , H04B3/36 , H04B10/00 , H04B10/032 , H04B10/077 , H04B10/16 , H04B10/29 , H04B17/40 , H04L1/24 , H04L25/02 , H04Q9/14 , H04B9/00
CPC分类号： H04B10/032 , H04B17/406 , H04L1/24
摘要： In an optical digital communication system having a plurality of optical repeaters inserted in an optical fiber cable, and a pair of terminal stations installed at the extreme ends of the optical fiber cable, the designation of the particular repeater from the terminal station is performed by the remote control signal which has the pulse pattern with the period designated to each repeater. Each repeater may have a plurality of switches for switching lasers for improving the operational reliability of the same by the redundant technique, and the control and/or the designation of the particular switch is also performed by said remote control signal by selecting the particular period and/or the repetition numbers of the period of the pulse pattern. Since the pulse pattern with the particular period and/or the repetition times of the period, and/or the repetition times and the sequence of the periods are utilized for designating the particular repeater and the switch in the designated repeater, the large number of objects (repeaters and switches) can be controlled, and the operational reliability of the control (designation) is very high.
摘要翻译： 在具有插入在光纤电缆中的多个光中继器和安装在光纤电缆的末端的一对终端站的光数字通信系统中，来自终端站的特定中继器的指定由 遥控信号具有指定给每个中继器的周期的脉冲模式。 每个中继器可以具有多个用于切换激光器的开关，用于通过冗余技术来提高其操作可靠性，并且特定开关的控制和/或指定也由所述遥控信号通过选择特定周期和 /或脉冲图案的周期的重复数。 由于具有特定周期的脉冲模式和/或周期的重复次数和/或周期的重复次数和时间序列用于指定指定中继器中的特定中继器和开关，所以大量的对象 （中继器和开关）可以控制，控制（指定）的操作可靠性非常高。
-
公开(公告)号：US4470146A
公开(公告)日：1984-09-04
申请号：US373549
申请日：1982-04-30
CPC分类号： H03M3/042
摘要： A robust ADPCM encoder with a modified leaky quantizer and a pair of parallel predictors is provided. A large leakage is initially inserted into the quantization scale adaptation by utilizing a number of most recent multipliers in a modified leaky Jayant quantizer. Using a dual predictor feedback loop, inside predictor coefficients are updated by the step size having unit variance instead of by the quantized prediction error.
摘要翻译： 提供了具有修改的泄漏量化器和一对并行预测器的鲁棒ADPCM编码器。 通过利用修改后的泄漏Jayant量化器中的多个最近的乘法器，最初将大的泄漏插入到量化尺度适应中。 使用双预测器反馈回路，通过具有单位方差而不是量化预测误差的步长来更新内部预测器系数。
-
-
-
-
-
-
-
-
搜索结果
9 条记录 (耗时 0.01 秒)
