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1. 发明授权

US4147990A Fast-recovery circuit 失效
标题翻译：快速恢复电路
公开(公告)号：US4147990A
公开(公告)日：1979-04-03
申请号：US884322
申请日：1978-03-07
申请人： Edwin A. Dokus , Thomas K. Naylor
发明人： Edwin A. Dokus , Thomas K. Naylor
IPC分类号： H03F1/26 , A61B5/04 , A61B5/0428 , G06G7/186 , H03K17/16 , H03K17/30 , H03F21/00
CPC分类号： H03K17/30 , A61B5/04004 , G06G7/186 , H03K17/16
摘要： An improved fast-recovery circuit for ECG amplifiers and the like. The fast-recovery circuit includes threshold responsive circuitry connected in parallel with part of the resistance associated with the integrator in a feedback circuit of the amplifier. The threshold responsive circuitry operates to increase feedback frequency response of the integrator when the normally very low frequency output signal of the amplifier exceeds a certain threshold. The improved circuit prevents the threshold circuitry from responding to pulses or excursions in the output signal of a relatively higher frequency content and which exceed the amplitude threshold for less than a predetermined interval, as for instance caused by pacer spikes, large QRS complexes and the like. Preferably, the improved threshold responsive means comprises transistor means connected across the integrator's resistance and having capacitance means across the base-emitter circuit thereof for inhibiting response to certain short duration signals.
摘要翻译：用于ECG放大器的改进的快速恢复电路等。快速恢复电路包括与放大器的反馈电路中与积分器相关联的电阻的一部分并联连接的阈值响应电路。当放大器的正常极低频输出信号超过一定阈值时，阈值响应电路用于增加积分器的反馈频率响应。改进的电路防止阈值电路响应相对更高频率内容的输出信号中的脉冲或偏移，并且超过阈值小于预定间隔，例如由起搏器尖峰，大QRS复合物等引起的。优选地，改进的阈值响应装置包括跨越积分器电阻并且跨过其基极 - 发射极电路的电容装置连接的晶体管装置，用于抑制对某些短持续时间信号的响应。

2. 发明授权

US4213161A Motor control for slow speed tape recorder 失效
标题翻译：慢速录音机的电机控制
公开(公告)号：US4213161A
公开(公告)日：1980-07-15
申请号：US956829
申请日：1978-11-02
申请人： Edwin A. Dokus , David Banks
发明人： Edwin A. Dokus , David Banks
IPC分类号： H02P27/06 , A61B5/0436 , G11B15/46 , G11B15/48 , G11B25/06 , G11B19/02
CPC分类号： G11B25/06 , A61B5/0436 , G11B15/46
摘要： An improved control is provided for the tape transport motor of a battery-powered, slow-speed tape recorder typically used for producing magnetic recordings of an ambulatory patient. The recorder's tape transport means is driven by a synchronous AC motor powered from a DC (battery) supply. That DC supply, during normal operation, is voltage regulated to provide desired speed stability. That DC supply is inverted into a square wave DC current in a manner effectively providing a regulated square wave AC at twice the regulated DC voltage. Phase-shifting means connected to the inverter provide a phase-shifted square wave source necessary for the two-phase AC synchronous motor. In an improved mode of control, means are additionally provided for selectively supplying current at full battery voltage, square wave inverted and phase-shifted to the AC synchronous motor in lieu of the regulated supply voltage to provide high torque operation for selected periods of time as during "start-up" or "warm-up".
摘要翻译：提供了一种改进的控制，用于通常用于产生移动病人的磁记录的电池供电的慢速磁带录音机的磁带传送电机。记录仪的磁带传送装置由一个由DC（电池）电源供电的同步交流电机驱动。在正常运行期间，该直流电源被调压以提供期望的速度稳定性。该DC电源以有效地提供两倍于调节的DC电压的调节方波AC的方式被反转成方波DC电流。连接到逆变器的相移装置提供两相交流同步电动机所需的相移方波源。在改进的控制方式中，还提供了用于以全电池电压（方波反相和相移到AC同步电动机）的方式提供电流来代替调节的电源电压，以在选定的时间段内提供高转矩操作，在“启动”或“预热”期间。

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