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GB1048064A - Improvements in or relating to frequency modulated or shifted telegraph and like receivers - Google Patents

Improvements in or relating to frequency modulated or shifted telegraph and like receivers

Info

Publication number
GB1048064A
GB1048064A GB2257565A GB2257565A GB1048064A GB 1048064 A GB1048064 A GB 1048064A GB 2257565 A GB2257565 A GB 2257565A GB 2257565 A GB2257565 A GB 2257565A GB 1048064 A GB1048064 A GB 1048064A
Authority
GB
United Kingdom
Prior art keywords
telegraph
degrees
signals
mixers
pass
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
GB2257565A
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.)
Telefunken Patentverwertungs GmbH
Original Assignee
Telefunken Patentverwertungs GmbH
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 Telefunken Patentverwertungs GmbH filed Critical Telefunken Patentverwertungs GmbH
Publication of GB1048064A publication Critical patent/GB1048064A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/10—Frequency-modulated carrier systems, i.e. using frequency-shift keying
    • H04L27/14—Demodulator circuits; Receiver circuits
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/10—Frequency-modulated carrier systems, i.e. using frequency-shift keying
    • H04L27/14—Demodulator circuits; Receiver circuits
    • H04L27/144—Demodulator circuits; Receiver circuits with demodulation using spectral properties of the received signal, e.g. by using frequency selective- or frequency sensitive elements
    • H04L27/152—Demodulator circuits; Receiver circuits with demodulation using spectral properties of the received signal, e.g. by using frequency selective- or frequency sensitive elements using controlled oscillators, e.g. PLL arrangements
    • H04L27/1525—Demodulator circuits; Receiver circuits with demodulation using spectral properties of the received signal, e.g. by using frequency selective- or frequency sensitive elements using controlled oscillators, e.g. PLL arrangements using quadrature demodulation

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Superheterodyne Receivers (AREA)
  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)

Abstract

1,048,064. Telegraphy. TELEFUNKEN PATENTVERWERTUNGS G.m.b.H. May 27, 1965 [May 29, 1964], No. 22575/65. Heading H4P. A receiver for frequency shift telegraph signals comprises an oscillator providing a signal of frequency equal to the mean of the shift frequencies, which signal is fed to two mixers, one via a 90 degrees phase shifter. The received telegraph signals pass to the mixers, the mixer outputs having a relative phase of Œ90 degrees dependent upon the frequency received. From these outputs is derived the D.C. telegraph signal. In a first embodiment, the mixer outputs pass to phase shifters which produce signals having a relative phase of 0 degrees or 180 degrees which pass to a phase detector to provide double current signals. In a second embodiment the mixers feed a gating and delay arrangement which provides pulses to operate a toggle giving the double current signals.
GB2257565A 1964-05-29 1965-05-27 Improvements in or relating to frequency modulated or shifted telegraph and like receivers Expired GB1048064A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DET26273A DE1190495B (en) 1964-05-29 1964-05-29 Circuit arrangement for demodulating frequency-shift keyed telegraphy messages

Publications (1)

Publication Number Publication Date
GB1048064A true GB1048064A (en) 1966-11-09

Family

ID=7552656

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2257565A Expired GB1048064A (en) 1964-05-29 1965-05-27 Improvements in or relating to frequency modulated or shifted telegraph and like receivers

Country Status (2)

Country Link
DE (1) DE1190495B (en)
GB (1) GB1048064A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2431226A1 (en) * 1978-07-11 1980-02-08 Int Standard Electric Corp Radio receiver for fsk signals - has local oscillator with output fed to D=flip=flop via two mixers and two limiting amplifier stages (DK 4.2.80)
FR2440124A1 (en) * 1978-10-24 1980-05-23 Int Standard Electric Corp RADIO RECEIVER FOR SOUND FREQUENCY MODULES

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2143386B (en) * 1983-07-14 1987-01-14 Standard Telephones Cables Ltd Radio receiver
CH667170A5 (en) * 1984-12-07 1988-09-15 Industrieorientierte Forsch METHOD FOR DETECTING THE INFORMATION OF A RECEIVE SIGNAL, IN PARTICULAR WITH FREQUENCY REVERSE.

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2431226A1 (en) * 1978-07-11 1980-02-08 Int Standard Electric Corp Radio receiver for fsk signals - has local oscillator with output fed to D=flip=flop via two mixers and two limiting amplifier stages (DK 4.2.80)
FR2440124A1 (en) * 1978-10-24 1980-05-23 Int Standard Electric Corp RADIO RECEIVER FOR SOUND FREQUENCY MODULES

Also Published As

Publication number Publication date
DE1190495B (en) 1965-04-08

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