GB798508A - Improvements in frequency dividing circuits - Google Patents

Improvements in frequency dividing circuits

Info

Publication number
GB798508A
GB798508A GB3713555A GB3713555A GB798508A GB 798508 A GB798508 A GB 798508A GB 3713555 A GB3713555 A GB 3713555A GB 3713555 A GB3713555 A GB 3713555A GB 798508 A GB798508 A GB 798508A
Authority
GB
United Kingdom
Prior art keywords
gate
mark
rate
pulses
oscillator
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
GB3713555A
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.)
REGINALD EDWARD ALBERT HEAD
HM Hobson Ltd
Original Assignee
REGINALD EDWARD ALBERT HEAD
HM Hobson 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 REGINALD EDWARD ALBERT HEAD, HM Hobson Ltd filed Critical REGINALD EDWARD ALBERT HEAD
Priority to GB3713555A priority Critical patent/GB798508A/en
Priority to FR1168244D priority patent/FR1168244A/en
Publication of GB798508A publication Critical patent/GB798508A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K5/00—Manipulating of pulses not covered by one of the other main groups of this subclass
    • H03K5/00006—Changing the frequency
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
    • G01F1/76—Devices for measuring mass flow of a fluid or a fluent solid material
    • G01F1/86—Indirect mass flowmeters, e.g. measuring volume flow and density, temperature or pressure
    • G01F1/90—Indirect mass flowmeters, e.g. measuring volume flow and density, temperature or pressure with positive-displacement meter or turbine meter to determine the volume flow
    • 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
    • G06F7/68—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 using pulse rate multipliers or dividers pulse rate multipliers or dividers per se
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03B—GENERATION OF OSCILLATIONS, DIRECTLY OR BY FREQUENCY-CHANGING, BY CIRCUITS EMPLOYING ACTIVE ELEMENTS WHICH OPERATE IN A NON-SWITCHING MANNER; GENERATION OF NOISE BY SUCH CIRCUITS
    • H03B19/00—Generation of oscillations by non-regenerative frequency multiplication or division of a signal from a separate source
    • H03B19/06—Generation of oscillations by non-regenerative frequency multiplication or division of a signal from a separate source by means of discharge device or semiconductor device with more than two electrodes
    • H03B19/08—Generation of oscillations by non-regenerative frequency multiplication or division of a signal from a separate source by means of discharge device or semiconductor device with more than two electrodes by means of a discharge device
    • H03B19/12—Generation of oscillations by non-regenerative frequency multiplication or division of a signal from a separate source by means of discharge device or semiconductor device with more than two electrodes by means of a discharge device using division only
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K11/00—Transforming types of modulations, e.g. position-modulated pulses into duration-modulated pulses
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K21/00—Details of pulse counters or frequency dividers

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Mathematical Optimization (AREA)
  • Mathematical Analysis (AREA)
  • Computing Systems (AREA)
  • Mathematical Physics (AREA)
  • Pure & Applied Mathematics (AREA)
  • General Engineering & Computer Science (AREA)
  • Computational Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Fluid Mechanics (AREA)
  • Measuring Volume Flow (AREA)

Abstract

798,508. Counting-apparatus. HOBSON, Ltd., H. M., FELLOWS, H., and HEAD, R. E. A. June 27, 1956 [Dec. 28, 1955], No. 37135/55. Class 106 (1). [Also in Group XXXVIII] A frequency-dividing circuit; particularly for a flowmeter, comprises a chain of electronic frequency dividers to which pulses are fed through a gate opened during alternate half cycles only of an oscillator having a variable mark/space ratio. The flowmeter may, as described in Specification 752,496, comprise a transmitter 21, 22 which produces pulses at a rate equal to the rate of volumetric flow of a liquid in a pipe 10, an amplifier 23, a shaper 24, binary dividers 26<SP>1</SP>-26<SP>4</SP> and an amplifier 27 driving a counter 28. In the present arrangement, the mark/space ratio of the oscillator 29 is varied manually or automatically (as described in Specification 788,798), [Group XXVIII], in accordance with the density of the liquid so that the counter 28 registers the mass-flow. A rate-meter 38, 39, such as that described in Specification 798,507, [Group XXXVIII], may be connected to the output of the first divider so as to register the rate of mass-flow. The oscillator 29 is a multivibrator, and the mark/space ratio is varied by a potentiometer arrangement 15 varying oppositely the grid potentials of the valves V1, V2. The anode of V2 is connected through a cathode follower 30 to the cathode of a triode gate 25. During the mark semi-periods, the cathode follower is cut off and the grid of the gate 25 is held slightly below cut-off so that input pulses, which, after shaping by a monostable flip-flop 24, are applied positively to the grid of the gate 25, cause conduction in the gate and negative output pulses at the anode. During the space semi-periods with the cathode follower conducting, the gate remains unconducting even on receipt of an input pulse.
GB3713555A 1955-12-28 1955-12-28 Improvements in frequency dividing circuits Expired GB798508A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
GB3713555A GB798508A (en) 1955-12-28 1955-12-28 Improvements in frequency dividing circuits
FR1168244D FR1168244A (en) 1955-12-28 1956-12-21 Improvements to frequency dividing circuits

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3713555A GB798508A (en) 1955-12-28 1955-12-28 Improvements in frequency dividing circuits

Publications (1)

Publication Number Publication Date
GB798508A true GB798508A (en) 1958-07-23

Family

ID=10394018

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3713555A Expired GB798508A (en) 1955-12-28 1955-12-28 Improvements in frequency dividing circuits

Country Status (2)

Country Link
FR (1) FR1168244A (en)
GB (1) GB798508A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2152719A (en) * 1984-01-09 1985-08-07 Nec Corp Battery saving signal generating circuit

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2152719A (en) * 1984-01-09 1985-08-07 Nec Corp Battery saving signal generating circuit

Also Published As

Publication number Publication date
FR1168244A (en) 1958-12-05

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