| 摘要 |
<p>1,008,330. Electric selective signalling. WESTERN ELECTRIC CO. Inc. June 15, 1962 [June 23, 1961], No. 23045/62. Heading G4H. [Also in Divisions G3 and H1] In a system for controlling the production ofresistors (Divisions G3 and H 1), an analogue -to - digital converter comprises resistors 196 ... 199 (e.g. 8, 4, 2, 1 ohms), fed with constant current through a regulator 202, and sequenced by arm 189 of a motor-driven selector switch controlling relays A ... D, which hold up over their contacts A2 . . . D2. The "digital" voltage across the resistors is fed through resistor 204 to an amplifier 183 where it is compared with the analogue measured value signal applied through resistor 181. When the digital voltage exceeds the analogue value relay 206 at the output of the amplifier is energized to open contacts 207 ... 211 in the relay holding circuits. Assuming this happens when relay B is sequenced, and C and D are already held up, a maintaining circuit for C and D will be provided by wiper shoe 217 on the selector switch, which shoe trails one contact behind arm 189. A similar test follows with circuit A. The resulting binary code appears on lines 212 . . . 216.</p> |
