ES362807A1 - Frequency discriminator device. (Machine-translation by Google Translate, not legally binding) - Google Patents

Frequency discriminator device. (Machine-translation by Google Translate, not legally binding)

Info

Publication number
ES362807A1
ES362807A1 ES362807A ES362807A ES362807A1 ES 362807 A1 ES362807 A1 ES 362807A1 ES 362807 A ES362807 A ES 362807A ES 362807 A ES362807 A ES 362807A ES 362807 A1 ES362807 A1 ES 362807A1
Authority
ES
Spain
Prior art keywords
signal
frequency
useful
discriminator
input signal
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
ES362807A
Other languages
Spanish (es)
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 Francaise Thomson Houston SA
Original Assignee
Compagnie Francaise Thomson Houston 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 Francaise Thomson Houston SA filed Critical Compagnie Francaise Thomson Houston SA
Publication of ES362807A1 publication Critical patent/ES362807A1/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N11/00—Colour television systems
    • H04N11/06—Transmission systems characterised by the manner in which the individual colour picture signal components are combined
    • H04N11/18—Transmission systems characterised by the manner in which the individual colour picture signal components are combined using simultaneous and sequential signals, e.g. SECAM-system
    • H04N11/186—Decoding means therefor
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03D—DEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER
    • H03D3/00—Demodulation of angle-, frequency- or phase- modulated oscillations
    • H03D3/02—Demodulation of angle-, frequency- or phase- modulated oscillations by detecting phase difference between two signals obtained from input signal
    • H03D3/06—Demodulation of angle-, frequency- or phase- modulated oscillations by detecting phase difference between two signals obtained from input signal by combining signals additively or in product demodulators
    • H03D3/08—Demodulation of angle-, frequency- or phase- modulated oscillations by detecting phase difference between two signals obtained from input signal by combining signals additively or in product demodulators by means of diodes, e.g. Foster-Seeley discriminator

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Stabilization Of Oscillater, Synchronisation, Frequency Synthesizers (AREA)

Abstract

Frequency discriminating device which, for an input signal at a frequency called "tuning frequency" and for a determined adjustment of its parameters, supplies a useful null signal, and for the same input signal, supplies a useful signal not null, when its parameters have varied under the influence of a drift having any cause, in particular aging, and in which the amplitude of the useful signal supplied, which is a function of the frequency of the input signal, depends on the amplitude of the latter, characterized in that the discriminator is combined with a set of drift compensation, connected in parallel between the input of the discriminator and a point at which the useful signal appears, and which comprises a device for detecting a direct voltage, whose amplitude is a function of that of the input signal, said device being connected to an adjustment circuit whose output signal or "compensation signal" "is an adjustable fraction in sign and in magnitude of said detected dc voltage, and is superimposed on the useful signal supplied by the discriminator, in such a way that a mismatch of the discriminator, due to a drift of its parameters, is compensated by a complementary adjustment of said adjustment circuit, by canceling, the "compensation signal" thus supplied, the parasitic signal affecting the useful signal, for a frequency of the input signal equal to the "tuning frequency". (Machine-translation by Google Translate, not legally binding)
ES362807A 1968-01-23 1969-01-22 Frequency discriminator device. (Machine-translation by Google Translate, not legally binding) Expired ES362807A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR136962 1968-01-23

Publications (1)

Publication Number Publication Date
ES362807A1 true ES362807A1 (en) 1970-11-16

Family

ID=8644922

Family Applications (1)

Application Number Title Priority Date Filing Date
ES362807A Expired ES362807A1 (en) 1968-01-23 1969-01-22 Frequency discriminator device. (Machine-translation by Google Translate, not legally binding)

Country Status (2)

Country Link
ES (1) ES362807A1 (en)
FR (1) FR1563825A (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2472302A1 (en) * 1979-12-21 1981-06-26 Thomson Csf PHASE SAVING CIRCUIT, AND DEVICE COMPRISING SUCH A CIRCUIT, IN PARTICULAR FOR TELEVISION

Also Published As

Publication number Publication date
FR1563825A (en) 1969-04-18

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