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1. 发明授权

US4574362A Block mode digital signal conditioning method and apparatus 失效
标题翻译：块模数字信号调理方法及装置
公开(公告)号：US4574362A
公开(公告)日：1986-03-04
申请号：US367660
申请日：1982-04-12
申请人： Howard R. Spindel , Vincent N. Ast, Jr. , Gary L. Brown
发明人： Howard R. Spindel , Vincent N. Ast, Jr. , Gary L. Brown
IPC分类号： G06F13/38 , G06F13/42 , G06F5/00
CPC分类号： G06F13/385 , G06F13/4221
摘要： Block mode is a method of formatting data when sending it to and from the host computer. Some host computer operating systems make it difficult for the user's program to send or receive the full ASCII character set. The block mode protocol lets you send and receive messages which use the full ASCII character set (including lowercase characters and control characters), even though your host computer's operating system makes it difficult to send and receive certain ASCII characters. (Indeed, even full eight-bit binary data bytes may be sent to or from the terminal in block mode.) This is accomplished by means of a packing scheme, in which messages using the full character set are packed into character strings using a subset of that character set.Also, the block mode protocol provides error detection and automatic retransmission of bad data blocks. This lets you transfer data to and from the terminal, without errors, despite occasional noise on the communications line. Block mode is completely independent of whether or not prompt mode is used and of whether the terminal is using full duplex or half duplex communications.When in block mode, data is packed into blocks and transmitted as a unit. Each block contains an "even/odd" counter (block control byte one, bit one) which is used in an "ACK/NAK" protocol. This protocol lets the host and terminal inform each other when a block has been received incorrectly. (The block received incorrectly is then retransmitted.)
摘要翻译：块模式是将数据发送到主计算机或从主计算机发送数据时的格式化方法。一些主机操作系统使得用户的程序难以发送或接收完整的ASCII字符集。块模式协议允许您发送和接收使用完整ASCII字符集（包括小写字符和控制字符）的消息，即使您的主机操作系统难以发送和接收某些ASCII字符。（实际上，甚至可以以块模式向终端发送完整的八位二进制数据字节。）这是通过打包方案来实现的，其中使用全部字符集的消息使用子集打包到字符串中的字符集。此外，块模式协议提供错误检测和坏数据块的自动重传。这可以让您无需错误地将数据传输到终端，也可以在通信线路上偶然发生噪声。块模式完全独立于是否使用提示模式以及终端是使用全双工还是半双工通信。在块模式下，数据被打包成块并作为一个单元传输。每个块包含在“ACK / NAK”协议中使用的“偶数/奇数”计数器（块控制字节1，位1）。该协议允许主机和终端在块被错误地接收时通知对方。（接收到错误的块然后重发。

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