公开(公告)号：US20030090738A1

公开(公告)日：2003-05-15

申请号：US10054248

申请日：2001-11-13

Inventor： Satish Ananthaiyer ,  Eric David Elias

IPC: H04N001/00

CPC classification number: H04N1/001 ,  H04N1/33323 ,  H04N2201/33371

Abstract: A facsimile modem transmitter (40) uses pre-fax control signals, such as an answer tone or an FSK (frequency shift keying) modulation signal, to determine a channel spectral shape of the transmission media (14) before transmitting the fax data. The transmitter (40) determines average energy values of the pre-fax signals as a function of frequencies to determine the channel spectral shape. Using the channel spectral shape information, an appropriate transmission shaping filter (64, 66, 68) is chosen for use by the transmitter (40). This achieves better transmit and receive performance by compensating for roll-off on the transmission media (14), or channel, without the need to use specific training signals.

Abstract translation: 传真调制解调发射机（40）使用诸如应答音调或FSK（频移键控）调制信号之类的预先传真控制信号，以在发送传真数据之前确定传输介质（14）的信道频谱形状。 发射机（40）确定作为频率的函数的预传真信号的平均能量值，以确定信道频谱形状。 使用信道光谱形状信息，选择合适的传输整形滤波器（64,66,68）供发射器（40）使用。 这通过补偿传输介质（14）或通道上的滚降来实现更好的发射和接收性能，而不需要使用特定的训练信号。

公开(公告)号：US5898764A

公开(公告)日：1999-04-27

申请号：US757332

申请日：1996-11-27

Applicant: Takehiro Yoshida

Inventor： Takehiro Yoshida

IPC: H04N1/32 ,  H04M11/00

CPC classification number: H04N1/33323 ,  H04N1/33361 ,  H04N2201/0093 ,  H04N2201/33371

Abstract: A data communication apparatus automatically sets a signal send condition in accordance with an actual communication status. If the data communication apparatus accommodates a plurality of lines, a call is made from a first line to a second line and a predetermined signal is sent from the first line to the second line, and based on the received information, a signal send condition contained therein is determined and registered.

Abstract translation: 数据通信装置根据实际通信状态自动设定信号发送条件。 如果数据通信装置容纳多条线路，则从第一线路到第二线路进行通话，并且将预定信号从第一线路发送到第二线路，并且基于所接收的信息，包含信号发送条件 其中确定并注册。

公开(公告)号：US5369500A

公开(公告)日：1994-11-29

申请号：US78522

申请日：1993-06-16

Applicant: Henry W. Jacobs

Inventor： Henry W. Jacobs

IPC: H04L27/00 ,  H04L27/38 ,  H04N1/00 ,  H04N1/333 ,  H04M1/00

CPC classification number: H04N1/00005 ,  H04N1/00002 ,  H04N1/00034 ,  H04N1/00047 ,  H04N1/0005 ,  H04N1/00063 ,  H04N1/33323 ,  H04N2201/33371

Abstract: A system and method of determining the quality of a received facsimile signal is provided herein by measuring the received signal from a digital modem receiver 60. The end of a scan line is detected by looking for the special code of eleven logic 0s followed by a logic 1. The distance value between the position value of the received signal elements and the standard reference position is determined and if this distance exceeds a given threshold that is recorded and the percentage of those that exceed this threshold distance identifies the quality.

Abstract translation: 本文通过测量来自数字调制解调器接收器60的接收信号来提供确定接收到的传真信号的质量的系统和方法。扫描线的末端通过查找十一个逻辑0的特殊代码，随后是逻辑 确定接收信号元素的位置值与标准参考位置之间的距离值，并且如果该距离超过所记录的给定阈值，并且超过该阈值距离的那个百分比标识质量。

公开(公告)号：US5351134A

公开(公告)日：1994-09-27

申请号：US994471

申请日：1992-12-21

Applicant: Tatsuya Yaguchi ,  Takehiro Yoshida

Inventor： Tatsuya Yaguchi ,  Takehiro Yoshida

IPC: H04N1/333 ,  H04N1/00

CPC classification number: H04N1/33392 ,  H04N1/33323 ,  H04N2201/3335 ,  H04N2201/33371

Abstract: In an image communication system capable of performing communication at a plurality of transmission speeds, a transmission-side apparatus transmits a line condition check signal (a TCF signal of the CCITT facsimile recommendation T30, or the like) for determining a transmission speed prior to communication of image data. A reception-side apparatus determines an optimal transmission speed on the basis of a reception state of the line condition check signal (a square error accumulation value, an error count result, or the like in an equalizer of a reception-side modem), and informs the determined transmission speed or a fall-up or fall-down instruction of a transmission speed to a necessary step to the transmission-side apparatus. The optimal transmission speed according to a line condition can be set within a very short period of time.

Abstract translation: 在能够以多个传输速度进行通信的图像通信系统中，发送侧装置发送用于确定通信之前的传输速度的线路状态检查信号（CCITT传真推荐T30的TCF信号等） 的图像数据。 接收侧装置根据线路状态检查信号的接收状态（接收侧调制解调器的均衡器中的平方误差累加值，误差计数结果等），确定最佳传输速度，以及 将所确定的传输速度或传输速度的下降或下降指令传送到发送侧设备到必要步骤。 根据线路条件的最佳传输速度可以在非常短的时间内设置。

公开(公告)号：US5001571A

公开(公告)日：1991-03-19

申请号：US546708

申请日：1990-07-02

Applicant: Katsumi Murano

Inventor： Katsumi Murano

IPC: H04L1/00 ,  H04N1/333

CPC classification number: H04L1/1867 ,  H04L1/0007 ,  H04N1/33323 ,  H04N1/33361 ,  H04N1/33369 ,  H04N1/33392 ,  H04N2201/33371 ,  H04N2201/33378

Abstract: In a facsimile system, a document to be transmitted is read by a reader. The read image data is stored into an image memory. A control and processing section automatically selects a frame size of the image data in accordance with conditions of a transmission line to be used including a transmission distance between a calling system and a called system. The image data is framed by the selected frame size. The framed image data is then transferred through a MODEM to the transmission line. The facsimile system can effectively transmit the framed image data to the called system.

Abstract translation: 在传真系统中，读取器读取待发送的文件。 读取的图像数据被存储到图像存储器中。 控制和处理部分根据要使用的传输线的条件自动选择图像数据的帧大小，包括呼叫系统和被叫系统之间的传输距离。 图像数据由选定的帧大小构成。 然后将成帧的图像数据通过MODEM传送到传输线。 传真系统可以有效地将帧图像数据传输到被叫系统。

公开(公告)号：US4999716A

公开(公告)日：1991-03-12

申请号：US388814

申请日：1989-08-03

Applicant: Seiji Nakamura

Inventor： Seiji Nakamura

IPC: H04N1/333

CPC classification number: H04N1/33392 ,  H04N1/33323 ,  H04N2201/3335 ,  H04N2201/33371

Abstract: In a facsimile communication method, a receiving facsimile machine receives a training check field signal TCF from a transmitting facsimile machine and sends a confirmation to receive signal CFR or a failure to train signal FTT to the transmitting facsimile machine depending on a result of the reception of the training check field signal TCF so as to determine a modem transmission speed. A number of erroneous bits in the training check field signal TCF which is sent from the transmitting facsimile machine at an initial modem transmission speed and received by the receiving facsimile machine is detected, and the modem transmission speed is set based on the detected number of erroneous bits. A facsimile information bit which indicates the set modem transmission speed is added to the failure to train signal FTT which is sent from the receiving facsimile machine to the transmitting facsimile machine. The training check filed signal TCF is sent from the transmitting facsimile machine to the receiving facsimile machine at the modem transmission speed indicated by the failure to train signal FTT.

Abstract translation: 在传真通信方法中，接收传真机从发送传真机接收训练校验字段信号TCF，并根据接收信号CFR的接收结果向发送传真机发送接收信号CFR的确认或训练信号FTT的失败 训练校验场信号TCF，以便确定调制解调器的传输速度。 检测从发送传真机以初始调制解调器传输速度发送并由接收传真机接收的训练检查字段信号TCF中的多个错误位，并且基于检测到的错误数量来设置调制解调器传输速度 位。 指示设定的调制解调器传输速度的传真信息位被添加到训练从接收传真机发送到发送传真机的信号FTT的故障。 训练检查字段信号TCF以由训练信号FTT的故障指示的调制解调器传输速度从发送传真机发送到接收传真机。

公开(公告)号：US4939767A

公开(公告)日：1990-07-03

申请号：US194818

申请日：1988-05-17

Applicant: Yoshinori Saito ,  Hiroyuki Hayasaki ,  Hisashi Matsuyama ,  Hisaharu Nakashima

Inventor： Yoshinori Saito ,  Hiroyuki Hayasaki ,  Hisashi Matsuyama ,  Hisaharu Nakashima

IPC: H04N1/327 ,  H04N1/333 ,  H04N7/14

CPC classification number: H04N1/32791 ,  H04N1/32702 ,  H04N1/33323 ,  H04N1/33392 ,  H04N7/147 ,  H04N2201/3335 ,  H04N2201/33371

Abstract: A system for transmitting image data on a telephone network or equivalent, which typically includes video or visual telephones as apparatus of sending part and receiving part. In the video telephone of sending part, when an image data sending key is operated, a DTMF signal generator included in a modem is started to operated and a specified DTMF signal, for example, DTMF-A signal or DTMF-B signal is sent as a signal DTMF-DTA to a telephone circuit through a network control unit for approximate 300 milliseconds. Succeedingly, in spite of presence or absence of a responsive signal from the video telephone of receiving part, a non-signal state is formed for approximate 75 milliseconds, immediately thereafter, the image data is sent from the video telephone of sending part at a transmission speed of 4,800 bps or 2,400 bps. In the video telephone of receiving part, when the signal DTMF-DTA, that is, the above described DTMF-A signal or DTMF-B signal is continuously received for approximate 250 milliseconds, a modem thereof is started at 4,800 bps or 2,400 bps, and the image data being sent from the video telephone of sending part is received.

Abstract translation: 用于在电话网络或等同物上传送图像数据的系统，其通常包括作为发送部分和接收部分的装置的视频或可视电话。 在发送部分的视频电话中，当图像数据发送键被操作时，包括在调制解调器中的DTMF信号发生器开始运行，并且将指定的DTMF信号，例如DTMF-A信号或DTMF-B信号作为 通过网络控制单元向电话线路发送信号DTMF-DTA约300毫秒。 顺便地说，尽管存在或不存在来自接收部分的视频电话的响应信号，但是形成非信号状态大约75毫秒，紧接着，在发送时立即从发送部分的视频电话发送图像数据 速度为4,800 bps或2,400 bps。 在接收部分的视频电话中，当信号DTMF-DTA，即上述DTMF-A信号或DTMF-B信号连续接收大约250毫秒时，其调制解调器以4,800bps或2,400bps开始， 并且接收从发送部分的视频电话发送的图像数据。

公开(公告)号：US4897831A

公开(公告)日：1990-01-30

申请号：US162266

申请日：1988-02-29

Applicant: Tsuneo Negi ,  Sadasuke Kurahayashi ,  Teruyuki Nishii ,  Yasuhide Ueno ,  Masahiro Sakamoto ,  Takeshi Ono

Inventor： Tsuneo Negi ,  Sadasuke Kurahayashi ,  Teruyuki Nishii ,  Yasuhide Ueno ,  Masahiro Sakamoto ,  Takeshi Ono

IPC: H04L1/24 ,  H04L5/16 ,  H04N1/333

CPC classification number: H04N1/33346 ,  H04L1/243 ,  H04L5/16 ,  H04N1/33323 ,  H04N1/33392 ,  H04N2201/33335 ,  H04N2201/33364 ,  H04N2201/33371

Abstract: A data communication apparatus includes a data communication section for preforming data communication according to full duplex communication, a testing section for performing a communication test prior to the data communication, and a transmission controller for determining whether full duplex communication can be performed during a period of the communication test performed by the testing section. The testing section includes a backward signal generator, a backward signal detector, and a control signal analyzer. The backward signal generator and the backward signal detector may be replaced with an echo canceller.

Abstract translation: 数据通信装置包括：数据通信部，用于根据全双工通信进行数据通信;测试部，用于在数据通信之前执行通信测试;以及传输控制器，用于确定是否可以在一段时间内执行全双工通信 由测试部分执行的通信测试。 测试部分包括反向信号发生器，反向信号检测器和控制信号分析器。 反向信号发生器和反向信号检测器可以用回波消除器代替。

公开(公告)号：US2903517A

公开(公告)日：1959-09-08

申请号：US49991555

申请日：1955-04-07

Applicant: WESTERN UNION TELEGRAPH CO

Inventor： RIDINGS GARVICE H

IPC: H04N1/00 ,  H04N1/333

CPC classification number: H04N1/33361 ,  H04N1/00095 ,  H04N1/33323 ,  H04N1/33376 ,  H04N2201/33371