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1. 发明授权

US4500751A Data communication system 失效
标题翻译：数据通信系统
公开(公告)号：US4500751A
公开(公告)日：1985-02-19
申请号：US400060
申请日：1982-07-20
申请人： Michael L. Darland , Donald L. Stoner , James W. Baker, Jr. , Michael A. Sponhnholtz
发明人： Michael L. Darland , Donald L. Stoner , James W. Baker, Jr. , Michael A. Sponhnholtz
IPC分类号： H04M11/06 , H04M11/00
CPC分类号： H04M11/066
摘要： A data communication system including a central host terminal and a large number of remote terminals communicating with the host terminal through telephone lines. The remote terminal decodes frequency-shift-keyed signals and modulates an RF generator to display the data represented by the FSK signals on a conventional television screen. The remote terminal also includes a keypad and conventional two-tone signal generator for transmitting data to the host terminal. The remote terminal may also include a card reader and a frequency-shift-keyed modulator for generating FSK signals corresponding to information magnetically recorded on a card. The host terminal includes a TOUCH-TONE decoder for providing data signals indicative of the information from the remote terminals, an FSK decoder for generating data signals indicative of the information contained on cards read by the remote terminals, and an FSK modulator for transmitting FSK signals to the remote terminals. The FSK modulator in the host terminal switches from one frequency to another only at the zero crossings of the signal in order to prevent unwanted harmonics from being generated on the telephone lines. In order to allow the remote terminals to transmit alphanumeric data, a number of twelve-key keypads may be combined using circuitry which generates a keypad-identifying signal each time a key is pressed to uniquely identify the depressed key.
摘要翻译：一种数据通信系统，包括通过电话线与主机终端进行通信的中央主机终端和大量的远程终端。远程终端解码频移键控信号并调制RF发生器，以在常规电视屏幕上显示由FSK信号表示的数据。远程终端还包括键盘和用于向主机终端发送数据的常规双音信号发生器。远程终端还可以包括读卡器和用于产生对应于磁记录在卡上的信息的FSK信号的频移键控调制器。主机终端包括用于提供表示来自远程终端的信息的数据信号的TOUCH-TONE解码器，用于产生指示由远程终端读取的卡上包含的信息的数据信号的FSK解码器，以及用于发送FSK信号的FSK调制器到远程终端。主机终端中的FSK调制器仅在信号的过零点处从一个频率切换到另一个频率，以防止在电话线路上产生不必要的谐波。为了允许远程终端发送字母数字数据，可以使用每次按下键来唯一地识别所按下的键时产生键盘识别信号的电路来组合多个十二键键盘。

2. 发明授权

US4466107A Data communication system 失效
标题翻译：数据通信系统
公开(公告)号：US4466107A
公开(公告)日：1984-08-14
申请号：US301467
申请日：1981-09-14
申请人： Donald L. Stoner
发明人： Donald L. Stoner
IPC分类号： H04L5/14 , H04L25/00 , H04L25/02 , H04B1/38
CPC分类号： H04L25/028 , H04L25/00 , H04L25/0292 , H04L5/1423 , H04L25/0266 , H04L25/0272
摘要： A data communication system in which a digital signal is applied directly to a limited bandwidth data link, such as a telephone line. Harmonies of the digital signal are attenuated either by a low-pass filter or by the limited bandwidth of the data link so that only the fundamental component of the digital signal passes through the data link. The resulting digital signal at the other end of the data link is differentiated and applied to a Schmidt trigger, which recreates the original digital signal. The data communication system may be connected to a digital device through an interface circuit which supplies appropriate signals for the serial I/O port of the digital device.
摘要翻译：一种数据通信系统，其中数字信号被直接应用于诸如电话线的有限带宽数据链路。数字信号的谐波由低通滤波器或数据链路的有限带宽衰减，使得仅数字信号的基波分量通过数据链路。在数据链路的另一端产生的数字信号被区分并应用于施密特触发器，其重新创建原始数字信号。数据通信系统可以通过接口电路连接到数字设备，该接口电路为数字设备的串行I / O端口提供适当的信号。

3. 发明授权

US4627078A Data communication system 失效
标题翻译：数据通信系统
公开(公告)号：US4627078A
公开(公告)日：1986-12-02
申请号：US606916
申请日：1984-05-04
申请人： Donald L. Stoner
发明人： Donald L. Stoner
IPC分类号： H04L27/10
CPC分类号： H04L27/10
摘要： A system for communicating digital data over a limited bandwidth transmission link, including a transition detector for detecting transitions in the binary logic state of an input digital signal and generating a transition indicator signal in response thereto; a frequency-shift key responsive to the transition indicator signal for generating a frequency-shift keyed signal to be transmitted over the link corresponding to the logic states of the input digital signal, the frequency-shift keyed signal comprised of substantially one cycle of a high-frequency signal for a bit at one logic state and substantially one-half cycle of a low-frequency signal for a bit at the other logic state; a zero-crossing detector for detecting zero-crossings of the frequency-shift keyed signal received over the link and generating a zero-crossing indicator signal; a frequency detector responsive to the zero-crossing signal for detecting the high-frequency and low-frequency signals of the frequency shift-keyed signal, and generating a frequency indicator signal; and a pulse generator responsive to the frequency indicator signal for generating an output digital signal corresponding to the input digital signal. A synchronizer synchronizes shifts between the high-frequency and low-frequency signals of the frequency-shift keyed signal with changes in the logic state of the digital signal. The frequency-shift key includes an oscillator for generating the high-frequency and low-frequency signals, and an oscillator reset for providing substantially in-phase signal shifts between the high-frequency and low-frequency signals of the frequency-shift keyed signal.
摘要翻译：一种用于在有限带宽传输链路上传送数字数据的系统，包括用于检测输入数字信号的二进制逻辑状态的转变的转换检测器，并响应于此产生转换指示符信号; 响应于转换指示符信号的频移键，用于产生要通过对应于输入数字信号的逻辑状态的链路发送的频移键控信号，该频移键控信号包括基本上一个高的周期在一个逻辑状态下的一位的频率信号和在另一个逻辑状态下的位的低频信号的大致一半周期; 用于检测通过链路接收的频移键控信号的过零点并产生过零指示符信号的过零检测器; 响应于过零信号的频率检测器，用于检测频移键控信号的高频和低频信号，并产生频率指示信号; 以及响应于频率指示器信号的脉冲发生器，用于产生对应于输入数字信号的输出数字信号。同步器通过数字信号的逻辑状态的变化来同步频移键控信号的高频和低频信号之间的移位。频移键包括用于产生高频和低频信号的振荡器，以及用于在频移键控信号的高频和低频信号之间提供基本上同相的信号移位的振荡器复位。

4. 发明授权

US4596022A FSK data communication system 失效
标题翻译： FSK数据通信系统
公开(公告)号：US4596022A
公开(公告)日：1986-06-17
申请号：US526335
申请日：1983-08-25
申请人： Donald L. Stoner
发明人： Donald L. Stoner
IPC分类号： H04L27/10
CPC分类号： H04L27/10
摘要： A system for communicating digital data over a limited bandwidth transmission link, including a transition detector for detecting transitions in the binary logic state of an input digital signal and generating a transition indicator signal in response thereto; a frequency-shift key responsive to the transition indicator signal for generating a frequency-shift keyed signal to be transmitted over the link corresponding to the logic states of the input digital signal, the frequency-shift keyed signal comprised of substantially one cycle of a high-frequency signal for a bit at one logic state and substantially one-half cycle of a low-frequency signal for a bit at the other logic state; a zero-crossing detector for detecting zero-crossings of the frequency-shift keyed signal received over the link and generating a zero-crossing indicator signal; a frequency detector responsive to the zero-crossing signal for detecting the high-frequency and low-frequency signals of the frequency-shift keyed signal, and generating a frequency indicator signal; and a pulse generator responsive to the zero-crossing indicator signal and the frequency indicator signal for generating an output digital signal corresponding to the input digital signal. A synchronizer synchronizes shifts between the high-frequency and low-frequency signals of the frequency-shift keyed signal with changes in the logic state of the digital signal. The frequency-shift key includes an oscillator for generating the high-frequency and low-frequency signals, and an oscillator reset for providing substantially in-phase signal shifts between the high-frequency and low-frequency signals of the frequency-shift keyed signal.
摘要翻译：一种用于在有限带宽传输链路上传送数字数据的系统，包括用于检测输入数字信号的二进制逻辑状态的转变的转换检测器，并响应于此产生转换指示符信号; 响应于转换指示符信号的频移键，用于产生要通过对应于输入数字信号的逻辑状态的链路发送的频移键控信号，该频移键控信号包括基本上一个高的周期在一个逻辑状态下的一位的频率信号和在另一个逻辑状态下的位的低频信号的大致一半周期; 用于检测通过链路接收的频移键控信号的过零点并产生过零指示符信号的过零检测器; 响应于过零信号的频率检测器，用于检测频移键控信号的高频和低频信号，并产生频率指示器信号; 以及响应于所述过零指示符信号和所述频率指示符信号的脉冲发生器，用于产生对应于所述输入数字信号的输出数字信号。同步器通过数字信号的逻辑状态的变化来同步频移键控信号的高频和低频信号之间的移位。频移键包括用于产生高频和低频信号的振荡器，以及用于在频移键控信号的高频和低频信号之间提供基本上同相的信号移位的振荡器复位。

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