Key generating system

In combination a plurality of ring circuits of different numbers of stages for generating cycles of different length, a group of holding circuits, means to impress on the input of one holding circuit at a time a pulse representing the resultant of simultaneously produced pulses from a plurality of said ring circuits, means controlled conjointly from others of said ring circuits for determining which holding circuit has impressed upon it at any one time such resultant pulse, a common output circuit for said holding circuits, said output circuit carrying a currently produced resultant pulse and pulses held over from previous pulse producing times superposed on one another, and means for selecting for use the current existing in said common output circuit at only separated instants of time with several of the primary pulse periods intervening between the current selecting instants.

In a pulse producing circuit, holding circuits divided into groups, means to produce separate series of irregular pulses in separate primary circuits, means to impress pulses in the first of said primary circuits upon said holding circuits, one at a time, means controlled by pulses in the second of said primary circuits to determined whether the pulse in the first primary circuit is to be applied to one of the holding circuits in the first group or to one of the holding circuits in the second group, means controlled by pulses in the third of said primary circuits to determine which of the holding circuits in the group determined by the pulse in the second of said primary circuits is to have applied to it the pulse in the first of said primary circuits, and a common output circuit for receiving from said holding circuits pulses which are the resultant of a currently applied pulse and pulses held over from different previous pulse periods.

In a pulse producing system, means to produce pulses at high rate in irregular sequence in the same circuit, means to sample said pulses only at instants of time separated from one another by several intervening periods of said high rate pulses, said sampling means including a plurality of separate sampling circuits operating in mutually staggered time relation whereby each samples a defferent one of said high rate pulses, means to prolong the sampled pulses in said sampling circuits into an overlapping time period with one another and means to derive a resultant summation pulse from said sampling circuits in common during said overlapping time period.

In a pulse producing circuit, means to produce pulses occurring at a high frequency and in irregular sequence, means to select a plurality of said pulses one at a time, with a large number of intervening pulses occurring between selected pulses, means to hold over the earlier selected of said plurality of pulses into overlapping time relation with respect to the last selected of said plurality of pulses, and means to combine the earlier and last selected pulses into a single resultant pulse.

A pulse producing system comprising an initial portion operating at high frequency and a subsequent portion operating at low frequency, means to generate irregularly occurring pulses at high frequency in said initial portion, means in said subsequent portion to produce low frequency pulses each having a time period great enough to include many successive high frequency pulse periods, including means for selecting from among said high frequency pulses a plurality or pulses all occurring at different non-overlapping times within one low frequency pulse period and separated from one another in time by a plurality of high frequency pulse periods, and means to combine each such plurality of selected pulses into a single resultant low frequency pulse in said subsequent portion of said system.

In a pulse producing system for supplying low frequency pulses with highly irregular manner of variation to a load circuit, for keying or kindred purposes, means to generate irregularly occurring high frequency pulses, a plurality of stepper circuits for translating from high frequency pulses to low frequency pulses, means to impress one of said high frequency pulses upon the first stepper for establishing therein a current representative of such one pulse, means to skip over several subsequent high frequency pulses and thereafter to impress one of said high frequency pulses from said generating means upon the second stepper for establishing therein a current representative of said latter pulse, both of said one and latter high frequency pulses occurring within the period of duration of one of said low frequency pulses, and means to combine the currents existing in both of said steppers at the same time to determined a low frequency pulse for supply to said load circuit.

In a key producing circuit, separate source of irregular pulses, a plurality of holding circuits each having an input circuit and an output circuit, means to connect, effectively, the input circuits of said holding circuits, one at a time, to certain of said sources in irregular order under control of pulses from other of said sources, each holding circuit, when not receiving pulses from any of said sources, maintaining the current in its ouput circuit at a value representative of the last pulse that was impressed on its input circuit from a said source, a common output terminal for the output circuits of all of said holding circuits, a bank of stepper circuits having input and output sides, circuits leading from their output sides in parallel to a common load point, and means for connecting the input sides of said stepper circuits one at a time in succession to said common output terminal whereby pulses of different character are impressed upon the different stepper circuits from said holding circuits.

In a key producing circuit, sources of irregular pulses for use in producing final key pulses, holding circuits divided into groups, each holding circuit having an input side for receiving pulses and an output side, means controlled by pulses from one of said sources for effectively connecting the input sides of individual holding circuits of the first group, one at a time, to receive pulses from another of said sources, each holding circuit when not connected to receive pulses on its input side maintaining its output current at a value representative of the impulse that was last impressed on its input side, the output sides of the holding circuits of said first group being connected to a common terminal, means controlled by pulses from another of said sources for effectively connecting the input sides of individual holding circuits of the second group, one at a time, to receive pulses from said common terminal, the output sides of the holding circuits of said second group being connected to a common point, and a load circuit connected to receive the pulses appearing at said common point.