GB1118903A - A frequency-modulated receiver - Google Patents

A frequency-modulated receiver

Info

Publication number
GB1118903A
GB1118903A GB939066A GB939066A GB1118903A GB 1118903 A GB1118903 A GB 1118903A GB 939066 A GB939066 A GB 939066A GB 939066 A GB939066 A GB 939066A GB 1118903 A GB1118903 A GB 1118903A
Authority
GB
United Kingdom
Prior art keywords
signal
feedback
frequency
mixer
frequency deviation
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
GB939066A
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to GB939066A priority Critical patent/GB1118903A/en
Publication of GB1118903A publication Critical patent/GB1118903A/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
    • H03D3/001—Details of arrangements applicable to more than one type of frequency demodulator
    • H03D3/003—Arrangements for reducing frequency deviation, e.g. by negative frequency feedback
    • H03D3/004—Arrangements for reducing frequency deviation, e.g. by negative frequency feedback wherein the demodulated signal is used for controlling an oscillator, e.g. the local oscillator

Landscapes

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

Abstract

1,118,903. Frequency modulation. I. A. GUSYATINSKY, and J. N. MARGOLlN. 3 March, 1966, No. 9390/66. Heading H3R. A frequency modulated receiver in which the frequency deviation is reduced by negative feedback before being applied to a narrow band i.f. stage 6 includes an outer feedback loop providing the negative feedback, and an inner loop providing positive feedback to restore the initial frequency deviation. In one embodiment, Fig. 2, the i.f. signal from amplifier 4 is fed to a mixer 5 together with a negative feedback signal to effect the frequency deviation reduction, and after passing through the narrow band amplifier 6 it is fed to a further mixer 7 together with a positive feedback signal to restore the original frequency deviation. The resulting signal, which has a lower threshold level, is then demodulated by a disciminator 9. The feedback signals fed to the mixers 5, 7 are produced by mixing the output from mixer 7 with that from a fixed frequency oscillator 13, in a further mixer 12. In a first modification, Fig. 1 (not shown), the feedback signals are produced by modulating an oscillator (11) with the output from the discriminator (9). In a second modification, Fig. 3 (not shown), the feed back signal is produced 'in the same manner as in Fig. 2, and demodulation is effected by a phase-sensitive detector (14), the reference signal for which is derived from the oscillator (13).
GB939066A 1966-03-03 1966-03-03 A frequency-modulated receiver Expired GB1118903A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB939066A GB1118903A (en) 1966-03-03 1966-03-03 A frequency-modulated receiver

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB939066A GB1118903A (en) 1966-03-03 1966-03-03 A frequency-modulated receiver

Publications (1)

Publication Number Publication Date
GB1118903A true GB1118903A (en) 1968-07-03

Family

ID=9871064

Family Applications (1)

Application Number Title Priority Date Filing Date
GB939066A Expired GB1118903A (en) 1966-03-03 1966-03-03 A frequency-modulated receiver

Country Status (1)

Country Link
GB (1) GB1118903A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0088467A2 (en) * 1982-03-09 1983-09-14 Koninklijke Philips Electronics N.V. FM receiver including a frequency-locked loop

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0088467A2 (en) * 1982-03-09 1983-09-14 Koninklijke Philips Electronics N.V. FM receiver including a frequency-locked loop
EP0088467A3 (en) * 1982-03-09 1983-10-26 N.V. Philips' Gloeilampenfabrieken Fm receiver including a frequency-locked loop

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