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1.发明授权Digital data receivers, methods and circuitry for differentiating between transmitted signals of varying physical protocols and frequencies 失效用于区分不同物理协议和频率的发射信号之间的数字数据接收机，方法和电路
公开(公告)号：US5717720A
公开(公告)日：1998-02-10
申请号：US355366
申请日：1994-12-13
CPC分类号： H04L12/44 , H04L25/0262 , H04L29/06 , H04L69/18
摘要： Disclosed are digital data receivers, methods and circuitry for differentiating between signals and data packets of varying physical layer protocols and frequencies transferred over a digital burst mode communications system, such as a packet-based LAN. Transitions in a received input signal to a squelch circuit start a counter which asserts one or more signals at various predetermined times from the transition. The absence or presence of the signal when the next transition in the input signal occurs indicates whether the input signal is less than or greater than a frequency associated with a particular predetermined time interval. When a predetermined number of transitions meeting a particular frequency requirement are received, the input signal is determined to be received at a particular frequency.
摘要翻译： 公开了用于区分不同物理层协议的信号和数据分组之间的数字数据接收机，方法和电路，以及通过数字突发模式通信系统（诸如基于分组的LAN）传送的频率。 接收到的输入信号到静噪电路的转换开始一个计数器，该计数器从转换的各种预定时间断言一个或多个信号。 当输入信号中的下一转换发生时，信号的不存在或不存在指示输入信号是否小于或大于与特定预定时间间隔相关联的频率。 当接收到满足特定频率要求的预定数量的转换时，确定输入信号以特定频率被接收。
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