公开(公告)号：US06721287B1

公开(公告)日：2004-04-13

申请号：US09392380

申请日：1999-09-09

申请人： Yhean-Sen Lai ,  Kannan Rajamani

发明人： Yhean-Sen Lai ,  Kannan Rajamani

IPC分类号： H04B320

CPC分类号： H04B3/23 ,  H04B14/048

摘要： A pulse code modulation modem having a far echo canceller that compensates for robbed bit echo noise by polling the receiving modem for robbed bit position information and incorporating that information into its far echo cancellation circuitry.

摘要翻译： 一种具有远回波消除器的脉码调制调制解调器，其通过轮询接收调制解调器用于抢占比特位置信息并将该信息并入其远回波消除电路来补偿抢地址回波噪声。

公开(公告)号：US06647023B1

公开(公告)日：2003-11-11

申请号：US09468827

申请日：1999-12-22

申请人： Hyung-Gon Lee

发明人： Hyung-Gon Lee

IPC分类号： H04J316

CPC分类号： G10L19/173 ,  H04B14/048 ,  H04Q11/0435 ,  H04Q2213/13031 ,  H04Q2213/13034 ,  H04Q2213/1322 ,  H04Q2213/13334

摘要： A circuit for converting a voice coding mode of a basic rate interfacing (BRI) card in an ISDN (Integrated Service Digital Network) keyphone system according to a voice coding mode of an office exchange. A PCM (Pulse Code Modulation) coding conversion circuit between an ISDN keyphone system and an office exchange, including an A/&mgr;-Law converter for converting the voice coding mode of the PCM data output from the ISDN keyphone system to an A-Law voice coding mode or a &mgr;-Law voice coding mode according to a coding mode of the office exchange and for converting the voice coding mode of the PCM data input to the ISDN keyphone system to an A-Law voice coding mode or a &mgr;-Law voice coding mode according to a coding mode of the ISDN or keyphone system, in response to a control signal output from a central processing unit so that a voice coding mode of the office exchange is matched to a voice coding mode of the ISDN keyphone system.

摘要翻译： 一种用于根据办公室交换机的语音编码模式在ISDN（综合业务数字网络）键盘系统中转换基本速率接口（BRI）卡的语音编码模式的电路。 一种ISDN键盘系统和办公室交换机之间的PCM（Pulse Code Modulation，编码调制）编码转换电路，包括用于将从ISDN键音系统输出的PCM数据的语音编码模式转换成A律声音的A / 编码模式或根据办公室交换的编码模式的mu-Law语音编码模式，并将输入到ISDN键盘系统的PCM数据的语音编码模式转换为A-Law语音编码模式或mu-Law语音 响应于从中央处理单元输出的控制信号，使得办公室交换机的语音编码模式与ISDN键盘系统的语音编码模式相匹配，根据ISDN或键盘系统的编码模式进行编码模式。

公开(公告)号：US06542551B1

公开(公告)日：2003-04-01

申请号：US09315475

申请日：1999-05-20

申请人： Yuri Okunev ,  Vitaly Drucker ,  Qin Wang ,  Yuri Goldstein

发明人： Yuri Okunev ,  Vitaly Drucker ,  Qin Wang ,  Yuri Goldstein

IPC分类号： H04B1404

CPC分类号： H04L25/4927 ,  H04B14/048 ,  H04J3/125

摘要： The receiver of a PCM modem utilizes the V.90 TRN1d training signal for detecting whether any of the six slots of the received signal may be subject to alternating robbed bit signaling (ARBS), and what the alternating robbed bit signaling pattern may be. This is accomplished by accumulating the received level over a plurality of frames for each slot and by comparing the received levels for each slot to an average level for that slot. If the difference between the received levels and the average levels exceeds a threshold, the slot is determined to be subject to ARBS. Where a slot is subject to ARBS, DIL sequence signals for frames of the alternating robbed bit signaling slot having LSB=0 and LSB=1 are accumulated separately (if available) in order to generate two translation tables (TRT0, TRT1) for that slot. Where the DIL sequence is found only in the frames having the alternating robbed bit signaling slot having LSB=0 or having LSB=1, only one translation table can be generated. Different algorithms are provided for designing a constellation for the alternating robbed bit signaling slot depending on (a) whether two translation tables were generated for the slot, (b) whether the frame-to-TRT correspondence is known, and (c) where only one translation table is generated, whether the translation table generated was TRT0 or TRT1.

摘要翻译： PCM调制解调器的接收机利用V.90 TRN1d训练信号来检测接收信号的六个时隙中的任一个是否可能经历交替的抢占位信令（ARBS），以及交替的抢占位信令模式可能是什么。 这是通过在每个时隙的多个帧上累积接收的电平并且通过将每个时隙的接收电平与该时隙的平均电平进行比较来实现的。 如果接收电平和平均电平之间的差异超过阈值，则确定该时隙被接受ARBS。 在时隙经受ARBS的情况下，具有LSB = 0和LSB = 1的交替抢占位信令时隙的帧的DIL序列信号被分别累积（如果可用），以便为该时隙产生两个转换表（TRT0，TRT1） 。 在仅具有LSB = 0或具有LSB = 1的交替抢夺位信令时隙的帧中找到DIL序列的情况下，只能生成一个转换表。 提供了不同的算法用于设计用于交替抢夺位信令时隙的星座，这取决于（a）是否为时隙生成了两个转换表，（b）帧到TRT对应是否已知，以及（c） 生成一个转换表，生成的转换表是否为TRT0或TRT1。

公开(公告)号：US06230120B1

公开(公告)日：2001-05-08

申请号：US09117574

申请日：1999-04-21

申请人： Jyri Suvanen

发明人： Jyri Suvanen

IPC分类号： G10L1100

CPC分类号： H04W88/181 ,  H04B14/048 ,  H04L1/24

摘要： In some call-switching systems, transmitted speech samples may be sent back (back-looping) to the sender from a telephone switching center if the switching center is unable to send the speech samples forward. When supplementary information is sent with the speech sample, back-looping may cause a problem if the sending device interprets the signal as originating from another device. To avoid this problem, transmitted samples are subjected to a check value calucation such as a checksum or a cyclic redundancy check. The check value is stored in memory and any received samples are subjected to a check value calculation and compared to the stored samples. If the comparison yields a match, then the device will know that the received samples originated from itself and can be properly handled.

摘要翻译： 在一些呼叫切换系统中，如果交换中心不能向前发送语音样本，则可以从电话交换中心将发送的语音样本发回（回环）给发送者。 当语音样本发送补充信息时，如果发送设备将信号解释为源自另一个设备，则回环可能会导致问题。 为了避免这个问题，发送的样本经过诸如校验和或循环冗余校验之类的校验值校准。 检查值存储在存储器中，任何接收到的样本都进行检查值计算，并与存储的样本进行比较。 如果比较产生匹配，则设备将知道接收到的样本源自于它并且可以被适当地处理。

公开(公告)号：US06195384B1

公开(公告)日：2001-02-27

申请号：US09003488

申请日：1998-01-06

申请人： Nuri Ruhi Dagdeviren

发明人： Nuri Ruhi Dagdeviren

IPC分类号： H04B138

CPC分类号： H04L25/4927 ,  H04B14/048

摘要： The present invention provides a method and apparatus for minimizing quantization noise in signal transmissions between modems coupled together via a digital network resulting from the performance of digital loss insertion in &mgr;-law encoded signal transmissions when the receiving modem is coupled to the digital network via an analog subscriber loop. In a preferred embodiment, the minimization of quantization noise is effected by providing a digital modem capable of &mgr;-law encoding and decoding a signal transmission; and capable of scaling the amplitude levels of signals generated by the modem; and capable of performing an inversion mapping.

摘要翻译： 本发明提供了一种用于使接收调制解调器经由数字网络耦合到数字网络时经由数字网络耦合在一起的调制解调器之间的信号传输中的信号传输的量化噪声的方法和装置， 模拟用户回路。 在优选实施例中，量化噪声的最小化通过提供能够进行mu-law编码和解码信号传输的数字调制解调器来实现; 并且能够缩放由调制解调器产生的信号的幅度电平; 并且能够执行反演映射。

公开(公告)号：US5930300A

公开(公告)日：1999-07-27

申请号：US935688

申请日：1997-09-23

申请人： William Lewis Betts ,  Keith Alan Souders

发明人： William Lewis Betts ,  Keith Alan Souders

IPC分类号： H04B14/04 ,  H04J3/12 ,  H04L25/49 ,  H04B1/10

CPC分类号： H04B14/048 ,  H04J3/125 ,  H04L25/4927

摘要： A cooperative feedback system is provided for a compensation system associated with, for example, a transmitter or codes, for enabling the compensation system to improve the accuracy of digital signals transmitted to a digital network. The cooperative feedback system is particularly suited for providing feedback to a compensation system for correcting distortion resulting from rob bit signaling (RBS), digital loss, or other types of digital signal degradation. The cooperative feedback system includes a compensation selector in a transmitter (e.g., digital modem, analog modem, codec, etc.) that combines compensations with frames of digital data by way of an addition mechanism to produce modified digital data frames. The transmitter is configured to transmit the modified digital data frames into the digital network. A receiver (e.g., digital modem, analog modem, etc.) is configured to receive the modified digital data frames from the digital network, to determine if accuracy of each of the modified digital data frames has increased based upon a corresponding compensation, and to communicate one or more quality feedback signals to the transmitter via the digital network. The one or more quality feedback signals indicate whether the accuracy of each of the digital data frames has increased based upon the corresponding compensations. The transmitter receives the quality feedback signal(s) and selects and implements the compensation that yields a highest accuracy based upon the quality feedback signal(s).

摘要翻译： 提供了一种用于与例如发射机或代码相关联的补偿系统的协作反馈系统，用于使得补偿系统能够提高发送到数字网络的数字信号的精度。 协作反馈系统特别适用于向补偿系统提供反馈，用于校正由比特信令（RBS）引起的失真，数字丢失或其他类型的数字信号劣化。 合作反馈系统包括在补偿机制中将补偿与数字数据的帧组合在发射机（例如，数字调制解调器，模拟调制解调器，编解码器等）中以产生修改的数字数据帧的补偿选择器。 发射机被配置为将经修改的数字数据帧发送到数字网络。 接收器（例如，数字调制解调器，模拟调制解调器等）被配置为从数字网络接收修改的数字数据帧，以基于相应的补偿来确定每个修改的数字数据帧的精度是否已经增加，并且 通过数字网络将一个或多个质量反馈信号传送到发射机。 一个或多个质量反馈信号指示每个数字数据帧的精度是否基于相应的补偿而增加。 发射机接收质量反馈信号，并根据质量反馈信号选择和实现产生最高精度的补偿。

公开(公告)号：US5724393A

公开(公告)日：1998-03-03

申请号：US390185

申请日：1995-02-17

申请人： Nuri Ruhi Dagdeviren

发明人： Nuri Ruhi Dagdeviren

IPC分类号： H03M7/50 ,  H04B1/64 ,  H04B14/04 ,  H04L25/49 ,  H04K1/02

CPC分类号： H04L25/4927 ,  H04B14/048

摘要： The present invention provides a method and apparatus for minimizing quantization noise in signal transmissions between modems coupled together via a digital network resulting from the performance of digital loss insertion in .mu.-law encoded signal transmissions when the receiving modem is coupled to the digital network via an analog subscriber loop. In a preferred embodiment, the minimization of quantization noise is effected by providing in a digital modem means for .mu.-law encoding and decoding of signal transmissions, means for scaling the amplitude levels of signals generated by the first modem down by a predetermined reduction factor to obtain factored signals in addition to means for performing an inversion mapping comprising a scaling of the amplitude level of the factored, .mu.-law encoded signals up by a predetermined inversion factor to obtain a gain in the amplitude level of the factored signals corresponding to the predetermined loss inserted in the amplitude levels of the transmitted .mu.-law encoded signals. In accordance with an alternate embodiment, the minimization of quantization noise is effected independently of the transmitting modem through an inversion mapping of .mu.-law encoded signals forming .mu.-law code words when transmitted through an interexchange (IEC) digital network. The inversion mapping is performed by scaling the amplitude levels of .mu.-law code words up by a predetermined inversion factor to obtain a gain corresponding to the predetermined loss subsequently inserted in the amplitude levels of the .mu.-law code words. This is accomplished by providing within a digital switch of the IEC network means for detecting one of the existence of a terminating analog subscriber loop and the occurrence of loss insertion over the digital network, means for determining the amount of loss inserted in the signal transmissions, means for performing a .mu.-law code word-to-code word inversion mapping.

公开(公告)号：US5029162A

公开(公告)日：1991-07-02

申请号：US490047

申请日：1990-03-06

申请人： David C. Epps

发明人： David C. Epps

IPC分类号： H03G3/20 ,  H04B14/04 ,  H04M3/56

CPC分类号： H04M3/568 ,  H03G3/3089 ,  H04B14/048 ,  H04M3/561

摘要： An automatic gain control for an inputted multiplex PCM data stream in a conferencing bridge in a telephone system. The inputted multiplexed data stream has a predetermined number of time slots wherein each time slot carries PCM speech data corresponding to an individual party in the conference call. The control of the present invention is capable of operating in .mu.-Law or A-Law companded format at a frequency of 192-256 kilobytes per second. The automatic gain control incorporates a digital root-mean-square meter, a COUNT sequence to change GAIN at predetermined intervals, and a set of GAIN rules to selectively increase or decrease GAIN based upon the output of the digital root-mean-square meter.

摘要翻译： 在电话系统中的会议桥中输入的多路PCM数据流的自动增益控制。 输入的复用数据流具有预定数量的时隙，其中每个时隙携带与会议呼叫中的个人对应的PCM语音数据。 本发明的控制能够以每秒192-256千字节的频率在mu -Law或A-Law压缩格式中操作。 自动增益控制包括数字均方根，以预定间隔改变GAIN的COUNT序列，以及一组GAIN规则，以根据数字均方值的输出选择性地增加或减少GAIN。

公开(公告)号：US4507792A

公开(公告)日：1985-03-26

申请号：US476620

申请日：1983-03-18

申请人： Kazuo Yamakido ,  Shiro Hagiwara ,  Fumiaki Fujii

发明人： Kazuo Yamakido ,  Shiro Hagiwara ,  Fumiaki Fujii

IPC分类号： H03M1/38 ,  H04B14/04 ,  H04B12/04 ,  H03K13/02

CPC分类号： H04B14/048

摘要： In a PCM encoder, in order to reduce noise in an idle channel or in the absence of any voice signal, a detector circuit is provided which detects the idle channel, and a circuit is connected to the detector circuit which fixes the polarity bit of the PCM signal produced by the PCM encoder when the detector circuit has detected the idle channel.

摘要翻译： 在PCM编码器中，为了减少空闲信道中的噪声或者没有任何语音信号，提供了一种检测电路，其检测空闲信道，并且电路连接到检测器电路，该电路将 当检测器电路检测到空闲信道时，由PCM编码器产生的PCM信号。

公开(公告)号：US4150367A

公开(公告)日：1979-04-17

申请号：US813435

申请日：1977-07-07

申请人： Carl G. Svala

发明人： Carl G. Svala

IPC分类号： H03M1/00 ,  H04B14/04 ,  H03K13/02 ,  H03K13/20

CPC分类号： H04B14/048 ,  H03M1/008

摘要： A codec is disclosed for encoding analog signals into compressed PCM (CPCM) and conversely for decoding CPCM information into analog signals. The signal to be encoded is compared with the decaying voltage on a capacitor, initially charged to a fixed voltage E, and being discharged through a fixed resistor to another fixed voltage -- dE, the time being measured by a binary digital counter from the start of the discharge until the voltage at the capacitor terminal equals the absolute value of the analog signal to be encoded. With proper choice of constants and clock frequency, the content of the binary counter at the time of coincidence represents the desired pulse code in complementary binary form of the analog signal sample to be encoded. Only the sign bit has to be added, which can be easily obtained from the polarity of the signal sample. Conversely, at the receiving end, the CPCM signal may be decoded into analog signal samples by timing the discharge of a similar or identical RC-circuit in accordance with the received code.

摘要翻译： 公开了一种用于将模拟信号编码成压缩PCM（CPCM）并相反地将CPCM信息解码为模拟信​​号的编解码器。 将要编码的信号与电容器上的衰减电压进行比较，最初充电到固定电压E，并通过固定电阻器放电到另一个固定电压dE，时间是从二进制数字计数器开始测量的 放电直到电容端子的电压等于要编码的模拟信号的绝对值。 通过适当选择常数和时钟频率，一致时的二进制计数器的内容表示要编码的模拟信号样本的互补二进制形式的期望脉冲编码。 只能添加符号位，这可以很容易地从信号样本的极性获得。 相反，在接收端，通过根据接收到的代码对类似或相同的RC电路进行定时放电，可将CPCM信号解码为模拟信​​号样本。