发明名称 |
ASYNCHRONOUS SIGNALING FOR DIGITAL COMMUNICATION CHANNEL |
摘要 |
<p>ASYNCHRONOUS SIGNALING FOR DIGITAL COMMUNICATION CHANNEL BY MICHAEL J. GREEN AND JAMES B. MC KAY A selected one of a plurality of unique N-bit digital code words that corresponds to an associated signaling message is continuously transmitted until it is desired to transmit a different signaling message. Decoder logic in the receiver looks at a new group of N-signaling bits during each signaling bit interval, without reference to the start of a transmitted code word, and makes a decision during each signaling bit interval as to what signaling message was transmitted. In this manner a keep-alive signal is virtually continuously provided in the receiver. Latch circuitry repeats the previous decision from the decoder logic when the current group of N-signaling bits does not correspond to one of the unique code words or an ordered permutation thereof. In an alternate embodiment a memory circuit requires that the decoder logic repeat the same decision as to what signaling message was transmitted for P consecutive groups of N-signaling bits (i.e., for P consecutive signaling bit intervals) before the latch circuit will indicate that a different signaling message is being transmitted.</p> |
申请公布号 |
CA1234644(A) |
申请公布日期 |
1988.03.29 |
申请号 |
CA19850487935 |
申请日期 |
1985.07.31 |
申请人 |
BRITISH COLUMBIA TELEPHONE COMPANY |
发明人 |
GREEN, MICHAEL J.;MCKAY, JAMES B. |
分类号 |
H04J3/02;(IPC1-7):H04J3/02 |
主分类号 |
H04J3/02 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|