-
公开(公告)号：US4878638A
公开(公告)日：1989-11-07
申请号：US2369
申请日：1987-01-12
CPC分类号： B61L23/166 , B61L1/187
摘要： An audio frequency (AF) track circuit whereby a railway track tuned loop transmitter operating in a dual resonant mode, for handling, two signal frequencies, can be coupled to the rails. Each frequency is conducted through a tuning unit having series and parallel branches tuned to each frequency. The track circuit using the tuned loop transmitter eliminates DC return current imbalance effects while maintaining suitably high track circuit shunting sensitivity.
摘要翻译： 音频（AF）轨道电路，其中以双谐振模式操作的用于处理两个信号频率的铁路轨道调谐环路发射机可以耦合到轨道。 每个频率通过调谐单元传导，该调谐单元具有调谐到每个频率的串联和并联分支。 使用调谐环路发射机的轨道电路消除了直流回波电流不平衡效应，同时保持适当的高跟踪电路分流灵敏度。
-
公开(公告)号：US5041745A
公开(公告)日：1991-08-20
申请号：US591394
申请日：1990-10-01
申请人： Frank A. Raso
发明人： Frank A. Raso
IPC分类号： H03H11/12
CPC分类号： H03H11/1213
摘要： A failsafe bandpass filter/decoder system comprising: an active bandpass filter which comprises a high-pass filter section having selected resistors which can only decrease in value during a failure mode and, in series with the high-pass filter section, a low-pass filter section having selected resistors which can only increase in value during a failure mode, whereby under any failure mode, the pass band of the filter will be reduced; and a level detector having an upper threshold voltage trip point and a lower threshold voltage trip point, both trip points having to be exceeded by the input wave form to produce a proper (square wave) output.
摘要翻译： 一种故障安全带通滤波器/解码器系统，包括：有源带通滤波器，其包括具有选择的电阻器的高通滤波器部分，其仅在故障模式期间仅能够降低值，并且与高通滤波器部分串联成低通滤波器 滤波器部分具有仅在故障模式下仅增加值的选择的电阻器，由此在任何故障模式下，滤波器的通带将被减小; 以及具有上阈值电压跳变点和较低阈值电压跳变点的电平检测器，两个跳变点必须被输入波形超出以产生适当的（方波）输出。
-
公开(公告)号：US3931533A
公开(公告)日：1976-01-06
申请号：US474359
申请日：1974-05-30
申请人： Frank A. Raso , John J. Saeli
发明人： Frank A. Raso , John J. Saeli
CPC分类号： B06B1/0253
摘要： A controllable frequency ultrasonic signal generator for driving an ultrasonic transducer via a switching type output circuit for the efficient transfer of energy thereto. The signal generator includes a phase lock loop feedback control for locking the operation of the oscillator to the resonant frequency of the transducer for following variations in transducer resonant frequency due to loading changes, temperature changes, tool tip variations, and the like.
摘要翻译： 一种可控频率超声波信号发生器，用于通过开关型输出电路驱动超声波换能器，以有效地传递能量。 信号发生器包括锁相环反馈控制，用于将振荡器的操作锁定到换能器的谐振频率，以便由于负载变化，温度变化，工具尖端变化等而导致换能器谐振频率的变化。
-
-
搜索结果
3 条记录 (耗时 0.02 秒)
