GB642782A - Improvements in or relating to circuits for demodulating frequency-modulated oscillations - Google Patents

Improvements in or relating to circuits for demodulating frequency-modulated oscillations

Info

Publication number
GB642782A
GB642782A GB1845/48A GB184548A GB642782A GB 642782 A GB642782 A GB 642782A GB 1845/48 A GB1845/48 A GB 1845/48A GB 184548 A GB184548 A GB 184548A GB 642782 A GB642782 A GB 642782A
Authority
GB
United Kingdom
Prior art keywords
frequency
circuit
signals
circuits
relating
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
GB1845/48A
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.)
Koninklijke Philips NV
Original Assignee
Philips Gloeilampenfabrieken NV
Philips Electronics NV
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 Philips Gloeilampenfabrieken NV, Philips Electronics NV filed Critical Philips Gloeilampenfabrieken NV
Publication of GB642782A publication Critical patent/GB642782A/en
Expired legal-status Critical Current

Links

Classifications

    • 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
    • H03D3/22—Demodulation of angle-, frequency- or phase- modulated oscillations by detecting phase difference between two signals obtained from input signal by means of active elements with more than two electrodes to which two signals are applied derived from the signal to be demodulated and having a phase difference related to the frequency deviation, e.g. phase detector

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
  • Gyroscopes (AREA)
  • Optical Transform (AREA)

Abstract

642,782. Frequency modulation. PHILIPS ELECTRICAL, Ltd. Jan. 21, 1948, No. 1845. Convention date, Jan. 24, 1947. [Class 40 (v)] In a mixing detector circuit for frequency modulated oscillations comprising two coupled oscillatory circuits 3, 4 tuned to the central frequency of the frequency-modulated signal, to the first of which the frequency modulated signals are applied, the variably phase-displaced signals, 90 degrees out of phase for the central frequency, being each appliedto one of two control grids 6, 5 of a mixer valve, a third circuit 8 tuned to the central frequency of the signals is coupled to the second circuit to improve by its damping the linearity of the detector. A formula for the coupling and damping is given.
GB1845/48A 1947-01-24 1948-01-21 Improvements in or relating to circuits for demodulating frequency-modulated oscillations Expired GB642782A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL642782X 1947-01-24

Publications (1)

Publication Number Publication Date
GB642782A true GB642782A (en) 1950-09-13

Family

ID=19791820

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1845/48A Expired GB642782A (en) 1947-01-24 1948-01-21 Improvements in or relating to circuits for demodulating frequency-modulated oscillations

Country Status (5)

Country Link
US (1) US2617022A (en)
DE (1) DE810521C (en)
FR (1) FR960109A (en)
GB (1) GB642782A (en)
NL (1) NL66627C (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2773182A (en) * 1951-07-19 1956-12-04 Hartford Nat Bank & Trust Co Circuit-arrangement for silent tuning in a frequency-modulation receiver
US2888558A (en) * 1954-11-18 1959-05-26 Radio Frequency Lab Inc Frequency shift discriminator
US2844720A (en) * 1954-12-06 1958-07-22 Radio Frequency Lab Inc Frequency shift discriminator
DE1018480B (en) * 1956-03-26 1957-10-31 Telefunken Gmbh Discriminator arrangement for very high frequencies
US2994830A (en) * 1959-04-13 1961-08-01 Texas Instruments Inc Tetrode transistor fm detector

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE469561A (en) * 1942-05-06
GB566556A (en) * 1943-08-27 1945-01-03 Gen Electric Co Ltd Improvements in frequency-modulation apparatus
NL74381C (en) * 1944-07-13
US2445996A (en) * 1945-01-13 1948-07-27 Philco Corp Frequency modulation detector circuit
US2457016A (en) * 1945-10-26 1948-12-21 Rca Corp Frequency modulation receiver tuning aid

Also Published As

Publication number Publication date
FR960109A (en) 1950-04-13
US2617022A (en) 1952-11-04
DE810521C (en) 1951-08-13
NL66627C (en)

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