GB660091A - Method of and means for discriminating between electrical impulses - Google Patents

Method of and means for discriminating between electrical impulses

Info

Publication number
GB660091A
GB660091A GB146539A GB146539A GB660091A GB 660091 A GB660091 A GB 660091A GB 146539 A GB146539 A GB 146539A GB 146539 A GB146539 A GB 146539A GB 660091 A GB660091 A GB 660091A
Authority
GB
United Kingdom
Prior art keywords
valve
frame
pulses
pulse
combined
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
GB146539A
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.)
GEORGE FREDERICK HAWKINS
KENNETH SILVANUS DAVIES
Murphy Radio Ltd
Original Assignee
GEORGE FREDERICK HAWKINS
KENNETH SILVANUS DAVIES
Murphy Radio 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 GEORGE FREDERICK HAWKINS, KENNETH SILVANUS DAVIES, Murphy Radio Ltd filed Critical GEORGE FREDERICK HAWKINS
Priority to GB146539A priority Critical patent/GB660091A/en
Publication of GB660091A publication Critical patent/GB660091A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R29/00—Arrangements for measuring or indicating electric quantities not covered by groups G01R19/00 - G01R27/00
    • G01R29/02—Measuring characteristics of individual pulses, e.g. deviation from pulse flatness, rise time or duration
    • G01R29/027—Indicating that a pulse characteristic is either above or below a predetermined value or within or beyond a predetermined range of values
    • G01R29/0273—Indicating that a pulse characteristic is either above or below a predetermined value or within or beyond a predetermined range of values the pulse characteristic being duration, i.e. width (indicating that frequency of pulses is above or below a certain limit)
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/04—Synchronising
    • H04N5/08—Separation of synchronising signals from picture signals
    • H04N5/10—Separation of line synchronising signal from frame synchronising signal or vice versa

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Secondary Cells (AREA)

Abstract

660,091. Television. MURPHY RADIO, Ltd., DAVIES, K. S., and HAWKINS, G. F. Nov. 5, 1947 [Jan. 16, 1939], No. 1465/39. Class 40 (iii). [Also in Group XL (c)] A pulse width discriminator for separating out frame pulses from combined frame and line synchronizing pulses in a television receiver. comprises a valve normally biassed to cut-off but which is arranged to conduct when the frame pulses in the combined frame and line pulse train are applied to an input circuit of the valve coincidently with shock-excited voltage pulses produced in an oscillatory circuit by the combined pulse train. As shown in Figs. 1 and 2, the combined pulse train comprising line synchronizing pulses a and frame synchronizing pulses b is applied to a grid-cathode circuit of valve 2 both grids of which are negatively biassed to ensure anode current cut-off by means of a battery 6. An oscillatory circuit 5 having a half-period of oscillation equal approximately to the duration of a line synchronizing pulse is shock excited by each pulse in the combined pulse train and supplies damped oscillatory voltage wavetrains d, e, g, k, &c. to a second grid-cathode circuit of valve 2, the arrangement being such that the valve is caused to conduct and therefore to supply signals at frame frequency only when an oscillatory half-wave voltage pulse such as q occurs coincidently with a frame synchronizing pulse b, the addition of the two pulses in this case being sufficient to overcome the fixed bias supplied by the battery 6. In a modification, Fig. 3 (not shown), a triode valve is used and the combined pulse train is applied to the control grid and the oscillatory circuit is connected in the cathode circuit of the valve. In a further modification, Fig. 4 (not shown), a tetrode valve is employed and the arrangement is similar to that of Fig. 2 except that the oscillatory circuit is coupled to the input terminals by means of an auto-transformer. It is stated that the valve employed may be the gas-discharge valve of the frame scanning generator.
GB146539A 1939-01-16 1939-01-16 Method of and means for discriminating between electrical impulses Expired GB660091A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB146539A GB660091A (en) 1939-01-16 1939-01-16 Method of and means for discriminating between electrical impulses

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB146539A GB660091A (en) 1939-01-16 1939-01-16 Method of and means for discriminating between electrical impulses

Publications (1)

Publication Number Publication Date
GB660091A true GB660091A (en) 1951-10-31

Family

ID=9722452

Family Applications (1)

Application Number Title Priority Date Filing Date
GB146539A Expired GB660091A (en) 1939-01-16 1939-01-16 Method of and means for discriminating between electrical impulses

Country Status (1)

Country Link
GB (1) GB660091A (en)

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