发明名称 |
Method and apparatus for synchronizing a receiver end-key generator with a transmitter end-key generator |
摘要 |
A method of, and apparatus for, synchronizing a receiver end-Key Generator with a transmitter end-Key Generator wherein both Key Generators are coupled with a respective counter such that each counter state of each counter characterizes a place or position of the Key pulse chain produced by the associated Key Generator. Each counter state is formed in accordance with a formation principle from the preceding counter state. The counter state of the counter of the transmitter end-Key Generator is transmitted to the receiver end and there compared with the counter state of the counter of the receiver end-Key Generator and whenever there is a difference between both counter states the receiver end-Key Generator stepped forward until the difference is again zero. The receiver end-Key Generator is stepped forward when the determined difference of the counter states is smaller than a threshold value and such Key Generator is stepped forward in jumps which encompass many individual advancing steps whenever the difference of the counter states exceeds the aforesaid threshold value. |
申请公布号 |
US4071693(A) |
申请公布日期 |
1978.01.31 |
申请号 |
US19760652757 |
申请日期 |
1976.01.27 |
申请人 |
ANSTALT EUROPAISCHE HANDELSGESELLSCHAFT |
发明人 |
FRUTIGER, PETER |
分类号 |
H04L7/00;H04L9/12;(IPC1-7):04L7/00 |
主分类号 |
H04L7/00 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|