×

ELECTRONICALLY PROGRAMABLE SWITCHING SYSTEM

  • US 3,840,752 A
  • Filed: 05/16/1973
  • Issued: 10/08/1974
  • Est. Priority Date: 01/23/1973
  • Status: Expired due to Term
First Claim
Patent Images

1. A switching device comprising:

  • a plurality of control points and a plurality of switching elements, each said control point being associated with one or more of said switching elements, said switching elements being actuated by the presence of actuation information at said associated control point, a shift register having states related to said control points for supplying actuation information to said plurality of control points in a predetermined sequence under the control of timing pulses which advance the states of the register whereby a series of combinations of switching functions may be performed, the intervals between occurrence of consecutive timing pulses determining the period of time for which actuation information is present at the respective control points, a pulse supply means capable of supplying to the shift register timing pulses either recurring at relatively long intervals or recurring at relatively short intervals, means for deriving programme information from the actuation information present at said control points, the derived programme information being applied to said pulse supply means for determining, in accordance with a programme, whether the timing pulses supplied to said shift register recur at relatively long intervals or recur at relatively short intervals, a multistable programme override circuit having two stable output states, one output state providing for continuous supply to the shift register of timing pulses recurring at relatively short intervals, the other output state providing for supply to the shift register of timing pulses recurring at either relatively long intervals or at relatively short intervals in accordance with the programme, transition of the output state of the override circuit being controlled by information derived from one or more control points.

View all claims
  • 0 Assignments
Timeline View
Assignment View
    ×
    ×