公开(公告)号：US5142538A

公开(公告)日：1992-08-25

申请号：US511333

申请日：1990-04-19

申请人： Stanley L. Fickes ,  Bernard E. Stewart ,  Robert J. Grady ,  Rick L. Reagan ,  John Piccone ,  Richard C. Allen

发明人： Stanley L. Fickes ,  Bernard E. Stewart ,  Robert J. Grady ,  Rick L. Reagan ,  John Piccone ,  Richard C. Allen

IPC分类号： H04L29/08 ,  H04L1/14

CPC分类号： H04L1/14

摘要： An infrared RS 232 communication link protocol is particularly suited for correcting any errors introduced during a transmission of information. The information is transmitted from a transmitting station to a receiving station. Each of the stations has a control counter each of which toggles between a logic 0 and 1. The control counter for the transmitter and the receiver are phase locked so that all errors may be corrected. The receiver echoes each data bit back to the transmitter which compares the echoed data to the transmitted data. If there is a match, the transmission was successful. If there is no match, the data must be retransmitted. A retransmit control character RTXx is sent to indicate that the receiver should discard the previous character and prepare for a retransmission of the character having the error. Under the proper circumstances and if the counters are still phase locked, the receiver then discards the previously stored character and inverts the counter. If the receiver detects that it has received an erroneous character, such as one having multiple or no PPM pulses, the receiver will simply respond with the reject control character REJ. In such a case, the transmitter will respond with an RTXx which causes the receiver to discard the previously stored character and invert the counter.

摘要翻译： 红外RS 232通信链路协议特别适用于校正在信息传输期间引入的任何错误。 信息从发送站发送到接收站。 每个站具有控制计数器，每个控制计数器在逻辑0和1之间切换。发射器和接收器的控制计数器被锁相，从而可以校正所有错误。 接收机将每个数据位回送到发送器，发送器将回波数据与发送的数据进行比较。 如果有匹配，则传输成功。 如果没有匹配，则必须重发数据。 发送重发控制字符RTXx以指示接收者应丢弃先前的字符并准备重发具有该错误的字符。 在适当的情况下，如果计数器仍然锁定，则接收器将丢弃先前存储的字符并反转计数器。 如果接收机检测到它已经接收到诸如具有多个或没有PPM脉冲的错误字符，则接收机将简单地用拒绝控制字符REJ进行响应。 在这种情况下，发射机将以RTXx进行响应，导致接收机丢弃先前存储的字符并反转计数器。

公开(公告)号：US4471391A

公开(公告)日：1984-09-11

申请号：US364724

申请日：1982-04-02

申请人： Rick L. Reagan

发明人： Rick L. Reagan

IPC分类号： G11B15/03 ,  G11B27/10 ,  G11B27/11 ,  G11B27/13 ,  G11B27/32 ,  G11B27/34 ,  G11B15/18

CPC分类号： G11B27/329 ,  G11B27/13 ,  G11B27/34 ,  G11B2220/90

摘要： An improved tape timer is achieved by using pulses generated by a control track previously recorded on magnetic tape to determine the magnitude of phase shift between said control track pulses and pulses generated by a mechanical tachometer in contact with the magnetic tape. The pulses generated by said mechanical tachometer are counted and said counting sequence used to generate a pulse to up-date a tape timer. In response to a detected phase shift, the count sequence is dynamically adjusted by an amount determined by the magnitude of the phase shift in such a manner as to reduce said phase shift.

摘要翻译： 通过使用先前记录在磁带上的控制轨迹产生的脉冲来确定所述控制轨道脉冲之间的相移幅度和与磁带接触的机械转速计产生的脉冲的大小来实现改进的磁带定时器。 对所述机械转速计产生的脉冲进行计数，所述计数顺序用于产生脉冲以更新磁带计时器。 响应于检测到的相移，计数序列被动态地调整由相移量确定的量，以减少所述相移。