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Title: Signal transmission with secrecy
Claims: What is claimed is: 1. In a privacy system in which the signals are divided into fragments on a time basis and the different fragments are delayed in transmission by different amounts to afford privacy, a timing means having a timing cycle divided into several periods, a relay individual to each period and individually operated during its respective period by said timing means, a plurality of delay devices to introduce delay into said signals, means controlled by said timing means to select a delay device for each timing period, and means jointly controlled by said relays and selecting means to operate the selected devices. 2. In a privacy system comprising a traveling signal storage element and a succession of translator devices spaced along said element for introducing different amounts of delay into the signals, a timing device for dividing a timing cycle into time intervals, means operable from said timing device in each time interval to select a translator device for use in that interval, and means operable in each interval for confining the selection to only those translator devices that are not in position to repeat an already used signal portion. 3. In a privacy system comprising a traveling signal storage element and a succession of translator devices spaced along said element for introducing different amounts of delay into the signals, a timing device for dividing a timing cycle into time intervals, a scrambler, an exclusion relay circuit, a plurality of switching devices, and means to operate a different switching device each interval, each switching device when operated closing one circuit leading into the scrambler to effect selection of one of said translator devices and closing another circuit leading to said exclusion relay circuit for modifying the selection made by said scrambler. 4. In a privacy system comprising a traveling signal storage element and a succession of translator devices spaced along said element for introducing different amounts of delay into the signals, a timing device for dividing a timing cycle into time intervals, means to select one of said devices in each time interval, and means for preventing selection of devices that would repeat the translation of the same signal comprising a plurality of exclusion relays and means to operate them individually and successively in successive time intervals. 5. In a privacy system comprising a traveling signal storage element and a succession of translator devices spaced along said element for introducing different amounts of delay into the signals, a timing device for dividing a timing cycle into time intervals, circuits for individually selecting said devices in successive time intervals for use in the same interval, a plurality of exclusion relays individually controlling said circuits, and means to transfer the energizing circuit of said relays from one to the next in successive time intervals to prevent use of more than one translator device for the same signal element. 6. In a privacy system comprising a traveling signal storage element and a succession of translator devices spaced along said element for introducing different amounts of delay into the signal, a timing device for dividing a timing cycle into time intervals, circuits for individually selecting said devices in successive time intervals for use in the same interval, and means operable in response to the selection of a given device in one interval for preventing the selection of the next succeeding device in the following interval. 7. In a privacy system comprising a traveling signal storage element and a succession of translator devices spaced along said element for introducing different amounts of delay into the signals, a timing device for dividing a timing cycle into time intervals, means operable in each interval to select a device for use in that interval, an exclusion relay for each of a plurality of said devices, and means to energize said exclusion relays in successive order in succeeding time intervals including means to begin such energization with the relay corresponding to the device following that used in the next preceding time interval. 8. In a privacy system using a traveling magnetic tape and a plurality of electromagnets in magnetizing relation to said tape and spaced along said tape to effect delays in signals, timing means for dividing a signal into fragments of one time unit duration, switching relay means operable from said timing means in each time unit, and circuits controlled by said relay means for selecting one of said electromagnets for use in the same time unit and for preventing the selection of the electromagnet immediately following the one selected in the next preceding time unit. 9. In a privacy system comprising a traveling signal storage element and a succession of translator devices spaced along said element for introducing different amounts of delay into the signals, a timing device for dividing a timing cycle into time intervals, a signaling circuit, means operable in each time interval for selecting and connecting into said signaling circuit an individual one of said devices, and means simultaneously operable to progressively exclude from use the devices which coincide in position with stored signal elements that have already been translated by a previous device. 10. In a privacy system, a signal circuit, a moving magnetizable tape, electromagnets spaced along said tape in magnetizable relation thereto, a commutator having segments, relay means individually connected to said segments to be operated therefrom, and means operable in response to the operation of each relay means for selecting one of said electromagnets for use in translating signals between said tape and said circuit, said last means including means controlled from said relay means for preventing selection of an electromagnet following in position along said tape a previously used electromagnet by the distance traversed by a point on the tape in the time elapsed since the selection of said previously used electromagnet. 11. In a privacy system comprising a moving magnetizable tape and a succession of electromagnets spaced along said tape in magnetizable relation thereto, a signal circuit and a commutator, individual relay means connected to segments of said commutator and operated therefrom, scrambler means operative in response to the operation of each relay means to select one of said electromagnets and connect the same to said signal circuit, a set of exclusion relays, a set of exclusion control relays, and means jointly controlled by said individual relay means and said exclusion control relays for operating an exclusion relay each time of said individual relay means operates, said exclusion relays preventing selection of certain of said slectromagnets. 12. In a privacy system comprising a moving magnetizable tape and a succession of electromagnets spaced along said tape in magnetizable relation thereto, a signal circuit and a commutator, a code relay per electromagnet, said relays when operated individually connecting the corresponding electro-magnet to said signal circuit, a selector switch, a set of exclusion relays, an individual circuit controlled from each commutator segment, each such circuit when closed effecting operation of a code relay, each such circuit including a break closable by said selector switch and a further break closable by an exclusion relay. Other info: Inventors: Myers, Oscar (Mount Vernon, NY, US) Application Number: 495127 Filing Date: 1943-07-17 Publication_date: 1976-02-10 Assignee: Bell Telephone Laboratories, Incorporated (Murray Hill, NJ) Primary Class(es): 380/22 380/35 Other Classes: US Patent Ref:
Other Refs: Primary Examiner: Wilbur, Maynard R. Assistant Examiner: Bermiel, H. A. Attorney: Burgess; H. A., Hirsch; A. E. |
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