GB898779A - Improvements relating to function generators for digital computing engines - Google Patents

Improvements relating to function generators for digital computing engines

Info

Publication number
GB898779A
GB898779A GB2795358A GB2795358A GB898779A GB 898779 A GB898779 A GB 898779A GB 2795358 A GB2795358 A GB 2795358A GB 2795358 A GB2795358 A GB 2795358A GB 898779 A GB898779 A GB 898779A
Authority
GB
United Kingdom
Prior art keywords
gradient
store
value
values
gated
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
GB2795358A
Inventor
Geoffrey Charles Rowley
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.)
AV Roe and Co Ltd
Original Assignee
AV Roe and Co Ltd
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
Application filed by AV Roe and Co Ltd filed Critical AV Roe and Co Ltd
Priority to GB2795358A priority Critical patent/GB898779A/en
Priority to FR804008A priority patent/FR1235782A/en
Publication of GB898779A publication Critical patent/GB898779A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B19/00—Programme-control systems
    • G05B19/02—Programme-control systems electric
    • G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
    • G05B19/07—Programme control other than numerical control, i.e. in sequence controllers or logic controllers where the programme is defined in the fixed connection of electrical elements, e.g. potentiometers, counters, transistors
    • G05B19/075—Programme control other than numerical control, i.e. in sequence controllers or logic controllers where the programme is defined in the fixed connection of electrical elements, e.g. potentiometers, counters, transistors for delivering a step function, a slope or a continuous function
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
    • G06F1/02—Digital function generators
    • G06F1/03—Digital function generators working, at least partly, by table look-up
    • G06F1/035—Reduction of table size
    • G06F1/0356—Reduction of table size by using two or more smaller tables, e.g. addressed by parts of the argument
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F17/00—Digital computing or data processing equipment or methods, specially adapted for specific functions
    • G06F17/10—Complex mathematical operations
    • G06F17/17—Function evaluation by approximation methods, e.g. inter- or extrapolation, smoothing, least mean square method
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F7/00—Methods or arrangements for processing data by operating upon the order or content of the data handled
    • G06F7/60—Methods or arrangements for performing computations using a digital non-denominational number representation, i.e. number representation without radix; Computing devices using combinations of denominational and non-denominational quantity representations, e.g. using difunction pulse trains, STEELE computers, phase computers
    • G06F7/64—Digital differential analysers, i.e. computing devices for differentiation, integration or solving differential or integral equations, using pulses representing increments; Other incremental computing devices for solving difference equations
    • G06F7/66—Digital differential analysers, i.e. computing devices for differentiation, integration or solving differential or integral equations, using pulses representing increments; Other incremental computing devices for solving difference equations wherein pulses represent unitary increments only

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Mathematical Physics (AREA)
  • Computational Mathematics (AREA)
  • Mathematical Analysis (AREA)
  • Mathematical Optimization (AREA)
  • Pure & Applied Mathematics (AREA)
  • General Engineering & Computer Science (AREA)
  • Data Mining & Analysis (AREA)
  • Computing Systems (AREA)
  • Algebra (AREA)
  • Databases & Information Systems (AREA)
  • Software Systems (AREA)
  • Automation & Control Theory (AREA)
  • Complex Calculations (AREA)

Abstract

898,779. Function generators. ROE & CO. Ltd., A. V. Aug. 24, 1959 [Sept. 1, 1958], No. 27953/58. Class 106 (1). A digital arbitrary function generator, preferably for use with the digital integrator described in Specification 886,382 comprises a store a containing the gradients of straight lines approximating to the arbitrary function, a store b containing values of the variable at which a change from one gradient to another is required, and a control means l which causes a change of gradient at the output when the value of the variable reaches one of the values in the store b. Corresponding positions of the stores hold the gradient and the difference between the values of x between which the gradient lies. An appropriate difference value is gated to a register j. Incoming increments dx decrease this value until it reaches zero when a different gradient is selected, and a new value gated to j. If a dx decrement occurs the difference value in the currently selected section of store b is subtracted from the contents of j and subsequent decrements increase the quantity held in j.
GB2795358A 1958-09-01 1958-09-01 Improvements relating to function generators for digital computing engines Expired GB898779A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
GB2795358A GB898779A (en) 1958-09-01 1958-09-01 Improvements relating to function generators for digital computing engines
FR804008A FR1235782A (en) 1958-09-01 1959-09-01 Function generator for digital calculators

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2795358A GB898779A (en) 1958-09-01 1958-09-01 Improvements relating to function generators for digital computing engines

Publications (1)

Publication Number Publication Date
GB898779A true GB898779A (en) 1962-06-14

Family

ID=10267934

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2795358A Expired GB898779A (en) 1958-09-01 1958-09-01 Improvements relating to function generators for digital computing engines

Country Status (2)

Country Link
FR (1) FR1235782A (en)
GB (1) GB898779A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0462381A2 (en) * 1990-04-26 1991-12-27 Sanyo Electric Co., Ltd. Method and apparatus for processing audio signal
EP0562715A2 (en) * 1992-03-27 1993-09-29 Sony United Kingdom Limited Video signal generator with a low clock rate

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0462381A2 (en) * 1990-04-26 1991-12-27 Sanyo Electric Co., Ltd. Method and apparatus for processing audio signal
EP0462381B1 (en) * 1990-04-26 1997-06-25 Sanyo Electric Co., Ltd. Method and apparatus for processing audio signal
EP0562715A2 (en) * 1992-03-27 1993-09-29 Sony United Kingdom Limited Video signal generator with a low clock rate
EP0562715A3 (en) * 1992-03-27 1994-01-19 Sony Uk Ltd

Also Published As

Publication number Publication date
FR1235782A (en) 1960-07-08

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