US3925612A — Digital scrambling apparatus for use in pulsed si…

Claim 1

Independent Claim 151 words

In combination, a secrecy signaling system for transmitting a polarity modulated mesSage pulse series from a transmitting station to a receiving station including scrambling pulse generating means at both said stations, to produce a pair of identical scrambling pulse series, for scrambling and unscrambling, respectively, said message pulse series, scrambling pulse converting means at each of said stations to convert a scrambling control pulse series of arbitrarily varying polarity into a final scrambling pulse series, said converting means comprising a pulse shift register having a plurality of cascadeconnected pulse storage stages and an input fed by said control pulse series, at least one feedback circuit connecting the output of a first one of said stages to the input of a second preceding stage of said register, and at least one logical circuit interposed in the path of said feedback circuit, to produce final scrambled pulses at the output of said register.

Claim 2

Dependent Claim 151 words

In combination, a secrecy signaling system for transmitting a polarity modulated mesSage pulse series from a transmitting station to a receiving station including scrambling pulse generating means at both said stations, to produce a pair of identical scrambling pulse series, for scrambling and unscrambling, respectively, said message pulse series, scrambling pulse converting means at each of said stations to convert a scrambling control pulse series of arbitrarily varying polarity into a final scrambling pulse series, said converting means comprising a pulse shift register having a plurality of cascadeconnected pulse storage stages and an input fed by said control pulse series, at least one feedback circuit connecting the output of a first one of said stages to the input of a second preceding stage of said register, and at least one logical circuit interposed in the path of said feedback circuit, to produce final scrambled pulses at the output of said register.

Claim 3

Dependent Claim 58 words

In a secrecy signaling system as claimed in claim 1, said logical circuit having a pair of inputs and an output, said output being connected to the input of said second stage and said inputs being connected, respectively, to the output of said first stage through said feedback circuit and to the circuit preceding said second register stage.

Claim 4

Dependent Claim 33 words

In a secrecy signaling system as claimed in claim 2, said logical circuit being of the type producing an output polarity determined by the product of the polarities of the applied input pulses.

Claim 5

Dependent Claim 31 words

In a secrecy signaling system as claimed in claim 1, said scrambling control pulse series being produced and applied by single control pulse generator to both said transmitting and receiving stations.

Claim 6

Dependent Claim 34 words

In a secrecy signaling system as claimed in claim 1, said scrambling control pulse series being derived, at both said transmitting and receiving stations from the transmitted and received scrambled message pulse series, respectively.

Claim 7

Dependent Claim 190 words

In combination, a secrecy signaling system for transmitting a polarity modulated message pulse series from a transmitting station to a receiving station including scrambling pulse generating means at both said stations, to produce a pair of identical scrambling pulse series, for scrambling and unscrambling, respectively, said message pulse series, scrambling pulse converting means at each of said stations, to convert a scrambling control pulse series of arbitrarily varying polarity into a final scrambling pulse series, said converting means comprising a pulse shift register having a plurality of cascade-connected pulse storage stages and an input fed by said control pulse series, at least one feedback circuit connecting the output of a first one of said stages to the input of a second preceding stage of said register, at least one logical circuit interposed in the path of said feedback circuit, to produce final scrambled pulses at the output of said register, and further means inserted in said feedback circuit effective to prevent a polarity change of an irregular sequence of a fractional number of the feedback pulses derived from said first stage and applied to said second stage of said register.

Claim 8

Dependent Claim 190 words

In combination, a secrecy signaling system for transmitting a polarity modulated message pulse series from a transmitting station to a receiving station including scrambling pulse generating means at both said stations, to produce a pair of identical scrambling pulse series, for scrambling and unscrambling, respectively, said message pulse series, scrambling pulse converting means at each of said stations, to convert a scrambling control pulse series of arbitrarily varying polarity into a final scrambling pulse series, said converting means comprising a pulse shift register having a plurality of cascade-connected pulse storage stages and an input fed by said control pulse series, at least one feedback circuit connecting the output of a first one of said stages to the input of a second preceding stage of said register, at least one logical circuit interposed in the path of said feedback circuit, to produce final scrambled pulses at the output of said register, and further means inserted in said feedback circuit effective to prevent a polarity change of an irregular sequence of a fractional number of the feedback pulses derived from said first stage and applied to said second stage of said register.

Claim 9

Dependent Claim 111 words

In a secrecy signaling system as claimed in claim 6, said last means being comprised of a further logical circuit having a pair of inputs and an output, the polarity of the output pulses of said circuit corresponding, respectively, to the polarities of the input pulses if equal to one another and to the polarity of the preceding output pulse if the input polarities differ from one another, said output being connected to said second stage through said first logical circuit and one of said inputs being connected to the output of said first stage, and further means to apply control pulses to the remaining input of said further logical circuit.

Claim 10

Dependent Claim 22 words

In a secrecy signaling system as claimed in claim 7, said last control pulses being derived from said scrambling control pulse series.

Claim 11

Dependent Claim 54 words

In a secrecy signaling system as claimed in claim 6, said first logical circuit having a pair of inputs and an output, said inputs beinG fed, respectively, by the circuit preceding said second stage and by the output of said feedback circuit, and said output being connected to the input of said second stage.

Claim 12

Dependent Claim 68 words

In a secrecy signaling system as claimed in claim 6, said last means being comprised of a pair of oppositely controlled gates having a common output circuit connected to said second register stage, the input of at least one of said gates being connected to said first register stage, and means to simultaneously control both said gates by signals derived via a further logical circuit from said register.

Claim 13

Dependent Claim 60 words

In a secrecy signaling system as claimed in claim 10, said last-mentioned logical circuit having a pair of inputs connected to one stage of said register directly and indirectly through a delay device, respectively, and the inputs of said gates being derived, respectively, from another stage of said register and the output of said feedback circuit via a delay device.

Claim 14

Dependent Claim 68 words

In a secrecy signaling system comprising a plurality of shift registers and associated feedback circuits according to claim 6, connected in cascade at least one of said registers being fed by said control pulse series and the remaining registers being fed from a preceding register, and multiple circuit connections including logical circuit means between the stages of one of said registers to the input stages of another register.

Claim 15

Dependent Claim 21 words

In a secrecy signaling system as claimed in claim 12, including permuting switch means operably associated with said last-mentioned circuit connections.

Claim 16

Dependent Claim 25 words

In a secrecy signaling system as claimed in claim 12, including further feedback means interconnecting at least one of said registers with a preceding register.

Claim 17

Dependent Claim 177 words

In combination, a secrecy signaling system for transmitting a polarity modulated message pulse series from a transmitting station to a receiving station including scrambling pulse generating means at both said stations, to produce a pair of identical scrambling pulse series, for scrambling and unscrambling, respectively, said message pulse series, scrambling pulse converting means at both said stations to convert a scrambling control pulse of arbitrary varying polarity into a final scrambling pulse series, said converting means comprising a pulse shift register having a plurality of cascade-connected pulse storage stages and an input fed by said control pulse series, and a feedback circuit connecting the outputs of a plurality of stages of said register with the input of a preceding register stage, said feedback circuit including a logical circuit having a plurality of inputs each connected to one of said first-mentioned register stages and having an output connected to said preceding register stage, said logical circuit being of the type to produce an output polarity corresponding to the majority of the polarities of the input pulses applied thereto.

Claim 18

Dependent Claim 177 words

In combination, a secrecy signaling system for transmitting a polarity modulated message pulse series from a transmitting station to a receiving station including scrambling pulse generating means at both said stations, to produce a pair of identical scrambling pulse series, for scrambling and unscrambling, respectively, said message pulse series, scrambling pulse converting means at both said stations to convert a scrambling control pulse of arbitrary varying polarity into a final scrambling pulse series, said converting means comprising a pulse shift register having a plurality of cascade-connected pulse storage stages and an input fed by said control pulse series, and a feedback circuit connecting the outputs of a plurality of stages of said register with the input of a preceding register stage, said feedback circuit including a logical circuit having a plurality of inputs each connected to one of said first-mentioned register stages and having an output connected to said preceding register stage, said logical circuit being of the type to produce an output polarity corresponding to the majority of the polarities of the input pulses applied thereto.

Claim 19

Dependent Claim 66 words

In a secrecy signaling system as claimed in claim 15, said logical circuit being comprised of a plurality of and-gates each having two inputs fed by different pairs of a predetermined number of stages of said register, and an or-gate having its imputs fed each by one of the outputs of said and-gates and having its output applied to the input of said preceding register stage.

Claim 20

Dependent Claim 31 words

In a secrecy signaling system as claimed in claim 16, one of the inputs of said and-gates being derived from the output of said feedback circuit through a pulse delay device.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1978-12-08	1979-06-09	1979-12-09	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1982-12-08	1983-06-09	1983-12-09	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	1986-12-08	1987-06-09	1987-12-09	$7700.00	Window Closed / Lapsed

Digital scrambling apparatus for use in pulsed signal transmission

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