公开(公告)号：US3564339A

公开(公告)日：1971-02-16

申请号：US3564339D

申请日：1969-10-31

Applicant: KMS IND INC

Inventor： KATZ HAROLD W ,  MILLER MURRAY H

IPC: B23H3/02 ,  H02H3/02 ,  H02H3/00

CPC classification number: B23H3/02 ,  H02H3/023

Abstract: A circuit for the rapid turnoff of the load current in an electrochemical machining apparatus is disclosed. The approach employed is to shunt the load current through an SCR after a short circuit has been detected. The circuit operates to induce an additional voltage in the load circuit to reduce the load current to zero for a sufficient length of time to permit the SCR''s in series with the load to recover their blocking capability.

公开(公告)号：US3668307A

公开(公告)日：1972-06-06

申请号：US3668307D

申请日：1970-03-30

Applicant: KMS IND INC

Inventor： FACE WILLIAM W ,  KATZ HAROLD W ,  MILLER MURRAY H

IPC: H04N7/14 ,  H04N7/173 ,  H04N7/18

CPC classification number: H04N7/147 ,  H04N7/17363 ,  H04N2007/17372

Abstract: A two-way community antenna or closed circuit television system or community cable television system which permits two-way communication (including voice communication) through a transmission center from and between various terminals, such as schools, homes, hospitals, doctor''s offices, community centers, industrial sites and the like. A control center including a properly programmed digital computer continuously interrogates the system over a forward control channel and receives responses from the terminals over a return control channel. The computer also controls transmissions between the transmission center and the terminals and between the terminals via the transmission center. Each terminal is provided with a control unit for communication with the control center. The system utilizes an appropriate bridging amplifier or other suitable means to convert to a two-way link a portion of the transmission cable interconnecting the transmission center and the terminals. The system also contemplates the use of channel allocations between 0 and 300 MHz, it being practical to allocate in this range certain portions for return transmission channels for programs originating at the terminals and certain portions for extra forward transmission channels for special programs originating at the transmission center.

Abstract translation: 双向社区天线或闭路电视系统或社区有线电视系统，通过来自各个终端之间的传输中心（如学校，家庭，医院，医院，社区中心）进行双向通信（包括语音通信） ，工业场所等。 包括正确编程的数字计算机的控制中心通过前向控制信道连续地询问系统，并通过返回控制信道接收来自终端的响应。 计算机还通过传输中心控制传输中心和终端之间以及终端之间的传输。 每个终端设置有用于与控制中心进行通信的控制单元。 该系统利用适当的桥接放大器或其他合适的装置将传输电缆的一部分互连到传输中心和终端的双向链路。 该系统还考虑使用0和300MHz之间的信道分配，在这个范围内分配一些部分用于在终端发起的节目的返回传输信道以及用于在传输时产生的特殊节目的特定节目的特定部分 中央。