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GB726519A - Method of obtaining a harmonic from a series of periodically repeated impulses, and application of this method to telecommunication - Google Patents

Method of obtaining a harmonic from a series of periodically repeated impulses, and application of this method to telecommunication

Info

Publication number
GB726519A
GB726519A GB30324/53A GB3032453A GB726519A GB 726519 A GB726519 A GB 726519A GB 30324/53 A GB30324/53 A GB 30324/53A GB 3032453 A GB3032453 A GB 3032453A GB 726519 A GB726519 A GB 726519A
Authority
GB
United Kingdom
Prior art keywords
modulator
frequency
output
harmonic
filter
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
GB30324/53A
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.)
Compagnie Industrielle des Telephones SA
Original Assignee
Compagnie Industrielle des Telephones SA
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 Compagnie Industrielle des Telephones SA filed Critical Compagnie Industrielle des Telephones SA
Publication of GB726519A publication Critical patent/GB726519A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/04—Synchronising
    • H04N5/12—Devices in which the synchronising signals are only operative if a phase difference occurs between synchronising and synchronised scanning devices, e.g. flywheel synchronising
    • H04N5/123—Devices in which the synchronising signals are only operative if a phase difference occurs between synchronising and synchronised scanning devices, e.g. flywheel synchronising whereby the synchronisation signal directly commands a frequency generator
    • 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
    • H03B21/00—Generation of oscillations by combining unmodulated signals of different frequencies
    • H03B21/01—Generation of oscillations by combining unmodulated signals of different frequencies by beating unmodulated signals of different frequencies
    • H03B21/02—Generation of oscillations by combining unmodulated signals of different frequencies by beating unmodulated signals of different frequencies by plural beating, i.e. for frequency synthesis ; Beating in combination with multiplication or division of frequency

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Networks Using Active Elements (AREA)

Abstract

726,519. Valve generating circuits. COMPAGNIE INDUSTRIELLE DES TELEPHONES. Nov. 3, 1953 [Nov. 10, 1952], No. 30324/53. Classes 40 (5) and 40 (6). [Also in Group XL (b)] The nth harmonic of a frequency f is produced by generating short rectangular pulses of repetition frequency equal to f and of such duration that the nth harmonic in the pulse spectrum is zero, applying the pulses to a bandpass filter having a centre frequency nf and feeding the output of the filter to a modulator circuit of the type described in Specification 449,999, so that the frequency nf is produced. Pulses having a repetition frequency f and a duration m/nf (where m is a whole number) are fed to a band-pass filter 10 which selects from the pulse spectrum one or more pairs of harmonics, the harmonics of each pair being corresponding ones on opposite sides of the'frequency nf. The output of the filter is applied to modulators 3 and 10, the output of modulator 3 being fed through a low-pass filter 7 to modulator 10 and the output of modulator 10 through a bandpass amplifier to modulator 3. By this means the desired harmonic nf may be obtained at 17.
GB30324/53A 1952-11-10 1953-11-03 Method of obtaining a harmonic from a series of periodically repeated impulses, and application of this method to telecommunication Expired GB726519A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR726519X 1952-11-10

Publications (1)

Publication Number Publication Date
GB726519A true GB726519A (en) 1955-03-16

Family

ID=9110737

Family Applications (1)

Application Number Title Priority Date Filing Date
GB30324/53A Expired GB726519A (en) 1952-11-10 1953-11-03 Method of obtaining a harmonic from a series of periodically repeated impulses, and application of this method to telecommunication

Country Status (2)

Country Link
GB (1) GB726519A (en)
NL (2) NL178243B (en)

Also Published As

Publication number Publication date
NL178243B (en)
NL81534C (en)

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