GB840023A - Improvements in or relating to magnetic information storage devices - Google Patents

Improvements in or relating to magnetic information storage devices

Info

Publication number
GB840023A
GB840023A GB3670558A GB3670558A GB840023A GB 840023 A GB840023 A GB 840023A GB 3670558 A GB3670558 A GB 3670558A GB 3670558 A GB3670558 A GB 3670558A GB 840023 A GB840023 A GB 840023A
Authority
GB
United Kingdom
Prior art keywords
pulse
core
source
winding
output
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB3670558A
Inventor
Arthur Edward Brewster
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
STC PLC
Original Assignee
Standard Telephone and Cables PLC
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to FR78798D priority Critical patent/FR78798E/fr
Priority to FR1198643D priority patent/FR1198643A/en
Priority to DE1958I0014334 priority patent/DE1164472B/en
Priority to GB9812/58A priority patent/GB834624A/en
Priority to GB1190558A priority patent/GB849891A/en
Priority to GB3393258A priority patent/GB857736A/en
Application filed by Standard Telephone and Cables PLC filed Critical Standard Telephone and Cables PLC
Priority to GB3670558A priority patent/GB840023A/en
Priority to GB40289/58A priority patent/GB857506A/en
Priority to GB72359A priority patent/GB894654A/en
Priority to US800708A priority patent/US3136988A/en
Priority to FR790488A priority patent/FR75398E/en
Priority to CH7133559A priority patent/CH379570A/en
Priority to CH7220159A priority patent/CH374719A/en
Priority to FR792154A priority patent/FR75573E/en
Priority to US840696A priority patent/US3053993A/en
Priority to US840771A priority patent/US3045216A/en
Priority to FR808092A priority patent/FR76762E/en
Priority to FR810192A priority patent/FR76763E/en
Priority to DEI17229A priority patent/DE1113241B/en
Priority to BE584583A priority patent/BE584583A/en
Priority to CH8058459A priority patent/CH386484A/en
Priority to GB41589/59A priority patent/GB873944A/en
Priority to CH8166359A priority patent/CH374720A/en
Priority to FR812988A priority patent/FR76771E/en
Priority to NL246422A priority patent/NL246422A/xx
Priority to FR815183A priority patent/FR77020E/en
Priority to FR817081A priority patent/FR77071E/en
Priority to CH97560A priority patent/CH386483A/en
Publication of GB840023A publication Critical patent/GB840023A/en
Priority to US65305A priority patent/US3181136A/en
Priority to CH1360160A priority patent/CH391784A/en
Priority to DEJ19114A priority patent/DE1142906B/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B14/00—Transmission systems not characterised by the medium used for transmission
    • H04B14/02—Transmission systems not characterised by the medium used for transmission characterised by the use of pulse modulation
    • H04B14/04—Transmission systems not characterised by the medium used for transmission characterised by the use of pulse modulation using pulse code modulation
    • H04B14/046—Systems or methods for reducing noise or bandwidth
    • H04B14/048—Non linear compression or expansion
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
    • H03K17/51—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used
    • H03K17/80—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used using non-linear magnetic devices; using non-linear dielectric devices
    • H03K17/82—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used using non-linear magnetic devices; using non-linear dielectric devices the devices being transfluxors
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K23/00—Pulse counters comprising counting chains; Frequency dividers comprising counting chains
    • H03K23/76—Pulse counters comprising counting chains; Frequency dividers comprising counting chains using magnetic cores or ferro-electric capacitors
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K3/00—Circuits for generating electric pulses; Monostable, bistable or multistable circuits
    • H03K3/02—Generators characterised by the type of circuit or by the means used for producing pulses
    • H03K3/45—Generators characterised by the type of circuit or by the means used for producing pulses by the use, as active elements, of non-linear magnetic or dielectric devices
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
    • H03M1/00—Analogue/digital conversion; Digital/analogue conversion
    • H03M1/12—Analogue/digital converters
    • H03M1/34—Analogue value compared with reference values
    • H03M1/36—Analogue value compared with reference values simultaneously only, i.e. parallel type
    • H03M1/361—Analogue value compared with reference values simultaneously only, i.e. parallel type having a separate comparator and reference value for each quantisation level, i.e. full flash converter type
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
    • H03M5/00—Conversion of the form of the representation of individual digits
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
    • H03M7/00—Conversion of a code where information is represented by a given sequence or number of digits to a code where the same, similar or subset of information is represented by a different sequence or number of digits
    • H03M7/14—Conversion to or from non-weighted codes
    • H03M7/16—Conversion to or from unit-distance codes, e.g. Gray code, reflected binary code
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
    • H03M9/00—Parallel/series conversion or vice versa
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B14/00—Transmission systems not characterised by the medium used for transmission
    • H04B14/02—Transmission systems not characterised by the medium used for transmission characterised by the use of pulse modulation
    • H04B14/04—Transmission systems not characterised by the medium used for transmission characterised by the use of pulse modulation using pulse code modulation
    • H04B14/042—Special circuits, e.g. comparators
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B14/00—Transmission systems not characterised by the medium used for transmission
    • H04B14/02—Transmission systems not characterised by the medium used for transmission characterised by the use of pulse modulation
    • H04B14/04—Transmission systems not characterised by the medium used for transmission characterised by the use of pulse modulation using pulse code modulation
    • H04B14/044—Sample and hold circuits
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B14/00—Transmission systems not characterised by the medium used for transmission
    • H04B14/02—Transmission systems not characterised by the medium used for transmission characterised by the use of pulse modulation
    • H04B14/04—Transmission systems not characterised by the medium used for transmission characterised by the use of pulse modulation using pulse code modulation
    • H04B14/046—Systems or methods for reducing noise or bandwidth

Landscapes

  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Power Engineering (AREA)
  • Burglar Alarm Systems (AREA)
  • Investigating Or Analyzing Materials By The Use Of Magnetic Means (AREA)

Abstract

840,023. Circuits employing bi-stable magnetic elements. STANDARD TELEPHONES & CABLES Ltd. Nov. 14, 1958, No. 36705/58. Class 40 (9). [Also in Group XL (c)] Two similar magnetic cores 1, 2 having rectangular hysteresis characteristics have a triggering pulse from a further core 11 applied to their windings 3, 4, the pulse being of such amplitude and duration that only one of the cores is able to reverse its magnetization. Both cores are biased in opposite senses by windings 7 and 8, while core 1 has an input winding 5 which is wound in opposition to the trigger and bias windings on that core. An input pulse from a source 17 is applied to core 1 at the same time as the triggering pulse, and if this pulse exceeds a certain threshold value core 2 is reversed by the triggering pulse and a positive pulse is supplied by an output winding 10 to a gate 24. If the input pulse is below the threshold value or is absent, core 1 is reversed by the combined effect of the triggering pulse and the bias, and a negative pulse is supplied by an output winding 9. The core 11 is sequentially reversed by a sine wave current from source 16 in a winding 12, this source also controlling the gate 24 so that spurious outputs due to restoration of core 11 to its initial state are cut-off from output 23. Modifications are described in which the bias winding 8 is omitted or an additional input winding is provided on core 2. A number of the circuits described may be employed as sampling circuits 30-34, Fig. 3, in a five-digit-pulse decoder, the coded signals being received from a digit source 17 in serial form and read-out in parallel form on leads 40- 44. The presence or absence of each pulse in the serial code is then indicated by a positive or negative pulse, respectively, on the appropriate lead. The threshold property of the sampling circuits prevents response to spurious signals. As shown, the trigger pulse acting in a sampling circuit is applied over a delay circuit 35-39 from a common sine wave source 16, and the output is registered in a store 45-49. The five consecutive pulse positions of a coded digit occur during the positive half-cycle of the source 16, and the delay circuits are progressively graded so that each consecutive pulse position is coincident with the trigger pulse output from a corresponding delay circuit. In this arrangement the gates 24 are omitted from the sampling circuits and their positive or negative outputs, as the case may be, are registered in turn in the associated store. A readout device 50 is activated during negative halfcycle of source 16, and this causes all the stores to be read-out simultaneously whereby a pulse output is obtained in each lead 40-4. Specification 834,624 is referred to.
GB3670558A 1958-03-27 1958-11-14 Improvements in or relating to magnetic information storage devices Expired GB840023A (en)

Priority Applications (31)

Application Number Priority Date Filing Date Title
FR78798D FR78798E (en) 1958-10-23
FR1198643D FR1198643A (en) 1958-10-23 1958-01-30 Pulse coding systems
DE1958I0014334 DE1164472B (en) 1958-10-23 1958-01-30 Coders, especially for pulse code modulation
GB9812/58A GB834624A (en) 1958-10-23 1958-03-27 Improvements in or relating to code converting arrangements for pulse code modulationsystems
GB1190558A GB849891A (en) 1958-04-15 1958-04-15 Improvements in or relating to electric pulse code modulation systems of communication
GB3393258A GB857736A (en) 1958-11-14 1958-10-23 Improvements in or relating to magnetic trigger devices
GB3670558A GB840023A (en) 1958-11-14 1958-11-14 Improvements in or relating to magnetic information storage devices
GB40289/58A GB857506A (en) 1958-10-23 1958-12-15 Improvements in or relating to magnetic core trigger devices
GB72359A GB894654A (en) 1958-10-23 1959-01-08 Improvements in or relating to transfer circuits using saturable magnetic cores
US800708A US3136988A (en) 1958-03-27 1959-03-20 Code converting arrangements for pulse code modulation systems
FR790488A FR75398E (en) 1958-10-23 1959-03-26 Pulse coding systems
CH7133559A CH379570A (en) 1958-03-27 1959-03-26 Electrical signal converter for converting sample values of an electrical wave into code groups of digit pulses or vice versa
CH7220159A CH374719A (en) 1958-04-15 1959-04-14 Electrical pulse code modulation system for telecommunications
FR792154A FR75573E (en) 1958-10-23 1959-04-15 Pulse coding systems
US840771A US3045216A (en) 1958-10-23 1959-09-17 Magnetic information storage devices
US840696A US3053993A (en) 1958-10-23 1959-09-17 Magnetic trigger devices
FR808092A FR76762E (en) 1958-10-23 1959-10-21 Pulse coding systems
FR810192A FR76763E (en) 1958-10-23 1959-11-13 Pulse coding systems
DEI17229A DE1113241B (en) 1958-10-23 1959-11-13 Electronic threshold value arrangement
BE584583A BE584583A (en) 1958-11-14 1959-11-13 Magnetic information storage devices.
CH8058459A CH386484A (en) 1958-10-23 1959-11-14 Pulse amplitude discriminator
GB41589/59A GB873944A (en) 1958-10-23 1959-12-07 Improvements in or relating to electric pulse code translators
CH8166359A CH374720A (en) 1958-10-23 1959-12-10 Magnetic trigger device
FR812988A FR76771E (en) 1958-10-23 1959-12-14 Pulse coding systems
NL246422A NL246422A (en) 1958-10-23 1959-12-15
FR815183A FR77020E (en) 1958-10-23 1960-01-08 Pulse coding systems
FR817081A FR77071E (en) 1958-10-23 1960-01-29 Pulse coding system
CH97560A CH386483A (en) 1958-10-23 1960-01-29 Coding device
US65305A US3181136A (en) 1958-10-23 1960-10-27 Electric pulse code translators
CH1360160A CH391784A (en) 1958-10-23 1960-12-05 Electrical pulse code converter
DEJ19114A DE1142906B (en) 1958-10-23 1960-12-06 Electrical pulse code converter for converting a binary one-distance code into another code

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3670558A GB840023A (en) 1958-11-14 1958-11-14 Improvements in or relating to magnetic information storage devices

Publications (1)

Publication Number Publication Date
GB840023A true GB840023A (en) 1960-07-06

Family

ID=10390508

Family Applications (2)

Application Number Title Priority Date Filing Date
GB3393258A Expired GB857736A (en) 1958-03-27 1958-10-23 Improvements in or relating to magnetic trigger devices
GB3670558A Expired GB840023A (en) 1958-03-27 1958-11-14 Improvements in or relating to magnetic information storage devices

Family Applications Before (1)

Application Number Title Priority Date Filing Date
GB3393258A Expired GB857736A (en) 1958-03-27 1958-10-23 Improvements in or relating to magnetic trigger devices

Country Status (2)

Country Link
BE (1) BE584583A (en)
GB (2) GB857736A (en)

Also Published As

Publication number Publication date
GB857736A (en) 1961-01-04
BE584583A (en) 1960-05-13

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