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1. 发明授权

US4560943A F.M. demodulator with fail-safe features 失效
标题翻译：调频。解调器具有故障安全功能
公开(公告)号：US4560943A
公开(公告)日：1985-12-24
申请号：US493915
申请日：1983-05-12
申请人： Paul D. Negus , Tak C. Ng , Roger Badge , David W. Cowen
发明人： Paul D. Negus , Tak C. Ng , Roger Badge , David W. Cowen
IPC分类号： H03D3/06 , H03D3/00 , H03D3/02
CPC分类号： H03D3/06
摘要： An F.M. demodulator of the phase quadrature type is adapted for fail-safe operation and in particular for use in a railway signalling system. A Bessel band-pass filter is chosen for the design basis of the phase delay arm, its characteristics, failure modes and resulting effects are considered and the design adaptations required to avoid the potentially unsafe effects of failures are determined. Due to loss of failure in the unmodified filter design the slope of the phase characteristic can increase effectively broadening the filter bandwidth and reducing attenuation of out-of-band signals which could, as a result, provide a false output. The demodulator may be combined with a fiber-optic link to form part of a complete signaling transmission system.
摘要翻译：一个F.M. 相位正交型的解调器适用于故障安全操作，特别适用于铁路信号系统。选择贝塞尔带通滤波器用于相位延迟臂的设计基础，其特性，故障模式和结果影响被考虑，并且确定了避免故障潜在不安全影响所需的设计调整。由于未修改的滤波器设计失败，相位特性的斜率可以有效地增加滤波器带宽并减小带外信号的衰减，从而可能提供错误的输出。解调器可以与光纤链路组合以形成完整信令传输系统的一部分。

2. 发明授权

US4636933A Power control circuit with digital pulse width control 失效
标题翻译：功率控制电路采用数字脉冲宽度控制
公开(公告)号：US4636933A
公开(公告)日：1987-01-13
申请号：US757219
申请日：1985-07-19
申请人： David W. Cowen
发明人： David W. Cowen
IPC分类号： B61L1/18 , H02M7/5387 , H02M7/529
CPC分类号： H02M7/53871
摘要： A bridge network 1 of current switching devices 2, 3, 4, 5 is operated in full wave manner by controlling signals A, B, C, D respectively produced by two similar, parallel and pulse width modulated power control circuits 12, 13 connected to receive a common input signal, one pair of opposing switch devices (2, 5) being controlled by one circuit 12 and the other pair 3, 4 being controlled by the other circuit 13. The pulse width control inputs 14 of the circuits 12, 13 are connected to voltage sensing means in the bridge supply circuit so that the pulse width of the control signals A, B, C, D is determined in accordance with the bridge supply level. The arrangement is such that the control circuits 12, 13 although not be designed to fail-to-safety standards operate in a fail-safe manner to provide a constant level output of the input signal.
摘要翻译：电流开关器件2,3,4,5的桥接网络1通过控制分别由两个相似的并行和脉宽调制的功率控制电路12,13产生的信号A，B，C，D以全波方式操作，连接到接收公共输入信号，一对相对的开关器件（2,5）由一个电路12控制，另一对3,4由另一个电路13控制。电路12,13的脉冲宽度控制输入14 连接到桥式电源电路中的电压感测装置，使得控制信号A，B，C，D的脉冲宽度根据桥式电源电平确定。这种布置使得控制电路12,13虽然不被设计成以不能安全的方式被设计为以故障安全的方式工作，以提供输入信号的恒定电平输出。

3. 发明授权

US4763290A Apparatus for performing a fast Fourier transform 失效
标题翻译：用于执行快速傅里叶变换的装置
公开(公告)号：US4763290A
公开(公告)日：1988-08-09
申请号：US855247
申请日：1986-04-24
申请人： David W. Cowen
发明人： David W. Cowen
IPC分类号： G06F17/14 , H04L27/152 , G06F15/332
CPC分类号： H04L27/1525 , G06F17/141
摘要： In a railway vehicle safety system, a frequency modulated signal is transmitted to a vehicle informing, inter alia, of a safe maximum speed, the said speed being represented by the carrier modulation frequency. In addition, the frequency of the carrier may possess one of a number of alternative frequencies. Apparatus for analysing received signals to identify the carrier frequency and the modulation frequency employs a fast Fourier transform processor. In order to save computation time by eliminating useless calculations, a received signal is heterodyned by a local signal selected according to the carrier frequency identified and the base-band components are analysed to identify the modulation frequency. A first stage transform is performed to identify the carrier signal and select the local signal frequency for a complex heterodyne process in a second stage in which local signals in phase quadrature are mixed with the received signal and the results sampled to provide data for real and imaginary data arrays for the transform process. As a result of the second stage process, noise and common mode interference signals are rejected.
摘要翻译：在铁路车辆安全系统中，频率调制信号被发送到车辆，特别是通知安全最大速度，所述速度由载波调制频率表示。此外，载波的频率可以具有多个替代频率中的一个。用于分析接收信号以识别载波频率和调制频率的装置采用快速傅里叶变换处理器。为了通过消除无用的计算来节省计算时间，通过根据所识别的载波频率选择的本地信号对接收的信号进行外差，分析基带分量以识别调制频率。执行第一级变换以识别载波信号，并且在第二级中选择本地信号频率用于第二级，其中相位正交中的本地信号与接收信号混合，并且采样结果提供实际和虚拟的数据用于转换过程的数据数组。作为第二级处理的结果，噪声和共模干扰信号被拒绝。

4. 发明授权

US4672223A Proving safe operation 失效
标题翻译：证明安全操作
公开(公告)号：US4672223A
公开(公告)日：1987-06-09
申请号：US635005
申请日：1984-07-27
申请人： Roger Badge , David W. Cowen
发明人： Roger Badge , David W. Cowen
IPC分类号： H04B5/00 , B61L1/18 , G01R31/00 , H03K19/007 , B61L11/02
CPC分类号： B61L1/188 , H03K19/007
摘要： To ensure the safe operation of an electronic circuit, for example an amplitude modulated carrier signal generator, an output of the circuit is analyzed to prove the presence of predetermined signal characteristics, for example the carrier signal, or a modulation frequency. The predetermined signal alternatively may be superimposed on an input to the electronic signal and proved subsequently to be present in the output. The output of the circuit is passed inhibited, according to whether or not the signal characteristics are proved present, by means of an output enable gate which is self-latching providing the output continues to be proved correct. A start-up circuit delays a possible inhibit for a limited period following initial power connection to the circuit in order that the output can become established.
摘要翻译：为了确保电子电路（例如幅度调制载波信号发生器）的安全操作，分析电路的输出以证明存在预定信号特性，例如载波信号或调制频率。可选地，预定信号可以叠加在电子信号的输入上，并被证明随后存在于输出中。根据信号特性是否被证明存在，电路的输出被禁止，借助于输出使能门，该输入使能门是自锁，提供输出继续被证明是正确的。启动电路在初始电源连接到电路之后延迟可能的禁止时间，以便输出可以建立。

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