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    • 12. 发明授权
    • Method for error free message reception
    • 无错误消息接收的方法
    • US4908828A
    • 1990-03-13
    • US138852
    • 1987-12-29
    • Terry Tikalsky
    • Terry Tikalsky
    • H04L1/00
    • H04L1/0083
    • A method for ensuring accurate reception of digitally encoded messages that are transmitted over a broadcast network to a plurality of receivers. Each message is divided into packets and the set of packets comprising each message is cyclically retransmitted for a selected number of transmission cycles. Typically, from two to five transmission cycles are sufficient to ensure accurate reception of each message. Each packet includes all or part of a digitally encoded message, a header, and a cyclic redundancy check (CRC) code (or other error code). Each header identifies the message to which the packet belongs and the position of the packet within the message. Each receiver in the network stores an address in an internal memory, and is capable of comparing a transmitted address (in the header of one or more of the packets in each message) with its stored address and accepting only those packets having an appropriate address. Each accepted packet is checked for errors using the transmitted error code (which preferably is a CRC code). If no errors are detected, the packet number of the packet is added to a list of correctly received packets for the message. If an error is detected, the packet number of the packet is not added to this list. Upon retransmission of the same message, the receiver checks the list against the header of each retransmitted packet of the message, and accepts only those packets which were not previously received without error. In a preferred embodiment, the messages are transmitted in the SCA band of an FM channel. Each receiver preferably includes an appropriately programmed computer in which the signal processing operations comprising the invention are performed in software.
    • 一种用于确保将通过广播网络发送到多个接收机的数字编码消息的准确接收的方法。 每个消息被分成包,并且包括每个消息的包的集合在选定数量的传输周期中被循环地重传。 通常,从两到五个传输周期足以确保每个消息的准确接收。 每个分组包括全部或部分数字编码消息,报头和循环冗余校验(CRC)代码(或其他错误代码)。 每个标题标识分组所属的消息和消息中的分组的位置。 网络中的每个接收器将地址存储在内部存储器中,并且能够将发送的地址(每个消息中的一个或多个分组的报头中)与其存储的地址进行比较,并且仅接受具有适当地址的分组。 使用发送的错误代码(其优选地是CRC代码)来检查每个接受的分组的错误。 如果没有检测到错误,则该分组的分组号被添加到该消息的正确接收的分组的列表中。 如果检测到错误,则该数据包的数据包号不会添加到此列表中。 在重传相同的消息时,接收机根据消息的每个重新发送的分组的报头来检查列表,并且仅接受那些以前没有错误地接收到的分组。 在优选实施例中,消息在FM信道的SCA频带中发送。 每个接收机优选地包括适当编程的计算机,其中包括本发明的信号处理操作在软件中执行。