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1. 发明授权

US06297691B1 Method and apparatus for demodulating coherent and non-coherent modulated signals 有权
标题翻译：用于解调相干和非相干调制信号的方法和装置
公开(公告)号：US06297691B1
公开(公告)日：2001-10-02
申请号：US09592464
申请日：2000-06-09
申请人： Stephen D. Anderson , Daniel V. Hulse , Kevin B. Moore , Paul D. Kammann , Gabriel A. Maalouf
发明人： Stephen D. Anderson , Daniel V. Hulse , Kevin B. Moore , Paul D. Kammann , Gabriel A. Maalouf
IPC分类号： H03D300
CPC分类号： H04L27/2331 , H04L27/2273 , H04L2027/0057 , H04L2027/0067 , H04L2027/0079
摘要： A receiver receives modulated message signals in non-coherent FSK and coherent 8PSK protocols. A selectively configurable processor demodulates the message signals, and includes a demodulator that derives in-phase and quadrature signals based on the message signals. A phase detector is responsive to the in-phase and quadrature signals and delayed in-phase and quadrature signals to derive a phase signal. A selector is responsive to the in-phase and quadrature signals to selectively connect a loop filter between the phase detector and the demodulator. When the selector connects the filter between the phase detector and demodulator, the demodulator is responsive to filtered phase signals to lock onto a frequency of the message signals so that the processor operates as a phase locked loop to demodulate coherent modulated signals. When the selector disconnects the filter from between the phase detector and the demodulator, the demodulator demodulates non-coherent modulated signals and the phase detector supplies a phase signal representing the slope of the phase of the demodulated signal.
摘要翻译：接收机在非相干FSK和相干8PSK协议中接收调制消息信号。可选择性地配置的处理器解调消息信号，并且包括基于消息信号导出同相和正交信号的解调器。相位检测器响应于同相和正交信号以及延迟的同相和正交信号以导出相位信号。选择器响应于同相和正交信号，以选择性地连接相位检测器和解调器之间的环路滤波器。当选择器在相位检测器和解调器之间连接滤波器时，解调器响应于滤波的相位信号来锁定消息信号的频率，使得处理器作为锁相环操作以解调相干调制信号。当选择器从相位检测器和解调器之间断开滤波器时，解调器解调非相干调制信号，相位检测器提供表示解调信号相位斜率的相位信号。

2. 发明授权

US5928345A Field instrument with data bus communications protocol 失效
标题翻译：现场仪表带数据总线通讯协议
公开(公告)号：US5928345A
公开(公告)日：1999-07-27
申请号：US723688
申请日：1996-09-30
申请人： David E. Tetzlaff , Jogesh Warrior , Gabriel A. Maalouf
发明人： David E. Tetzlaff , Jogesh Warrior , Gabriel A. Maalouf
IPC分类号： G05B15/02 , G05B19/042 , G05B19/418 , G06F13/00
CPC分类号： G05B19/0421 , G05B15/02 , G05B19/4185 , G05B2219/25145 , Y02P90/18
摘要： The present invention includes a process control instrument having an improved data bus protocol for facilitating communications between master and slave nodes. The process control instrument includes a microprocessor operating in accordance with the SPI data bus protocol, first and second peripheral devices, and a data bus coupled to the microprocessor and the first and second peripheral devices. The improved data bus protocol used in the process control instruments of the present invention provides numerous advantages such as reduced printed circuit board space requirements and greater interchangeability of peripheral and master node components.
摘要翻译：本发明包括具有改进的数据总线协议以便于主节点与从节点之间的通信的过程控制装置。过程控制仪器包括根据SPI数据总线协议操作的微处理器，第一和第二外围设备以及耦合到微处理器和第一和第二外围设备的数据总线。在本发明的过程控制仪器中使用的改进的数据总线协议提供了许多优点，例如减少了印刷电路板空间要求以及外围和主节点组件的更大可互换性。

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