GB1127451A - Improvements relating to carrier shift telegraphy - Google Patents

Improvements relating to carrier shift telegraphy

Info

Publication number
GB1127451A
GB1127451A GB489565A GB489565A GB1127451A GB 1127451 A GB1127451 A GB 1127451A GB 489565 A GB489565 A GB 489565A GB 489565 A GB489565 A GB 489565A GB 1127451 A GB1127451 A GB 1127451A
Authority
GB
United Kingdom
Prior art keywords
modulator
signals
improvements relating
telegraphy
frequency
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
GB489565A
Inventor
Robert Keith Portway Galpin
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.)
Associated Electrical Industries Ltd
Original Assignee
Associated Electrical Industries Ltd
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 Associated Electrical Industries Ltd filed Critical Associated Electrical Industries Ltd
Priority to GB489565A priority Critical patent/GB1127451A/en
Priority to DE19661462403 priority patent/DE1462403A1/en
Publication of GB1127451A publication Critical patent/GB1127451A/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
    • 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
    • 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

Abstract

1,127,451. Telegraphy. ASSOCIATED ELECTRICAL INDUSTRIES Ltd. 26 Jan., 1966 [4 Feb., 1965], No. 4895/65. Heading H4P. In a frequency shift telegraph receiver the input signals f1, f2 pass to two modulators fed also by carrier frequency f 0 . One or the other of the inputs to one modulator is 90 degrees out of phase with the corresponding input to the other modulator. The modulator outputs pass, one via a 90 degrees phase shifter, to a combiner circuit, which gives on-off keyed signals of frequency f1-f2 on a pair of output leads. Low pass filters suppress other signals at the output.
GB489565A 1965-02-04 1965-02-04 Improvements relating to carrier shift telegraphy Expired GB1127451A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
GB489565A GB1127451A (en) 1965-02-04 1965-02-04 Improvements relating to carrier shift telegraphy
DE19661462403 DE1462403A1 (en) 1965-02-04 1966-02-03 Method and circuit arrangement for determining phase or frequency shifts, in particular for carrier frequency telegraph systems

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB489565A GB1127451A (en) 1965-02-04 1965-02-04 Improvements relating to carrier shift telegraphy

Publications (1)

Publication Number Publication Date
GB1127451A true GB1127451A (en) 1968-09-18

Family

ID=9785894

Family Applications (1)

Application Number Title Priority Date Filing Date
GB489565A Expired GB1127451A (en) 1965-02-04 1965-02-04 Improvements relating to carrier shift telegraphy

Country Status (2)

Country Link
DE (1) DE1462403A1 (en)
GB (1) GB1127451A (en)

Cited By (4)

* 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)
FR2464603A1 (en) * 1979-09-04 1981-03-06 Int Standard Electric Corp RADIO COMMUNICATION RECEIVER IN FREQUENCY DISPLACEMENT MODULATION
EP0070695A2 (en) * 1981-07-16 1983-01-26 International Standard Electric Corporation Radio receiver for frequency shift keyed signals
EP0098665A2 (en) * 1982-07-07 1984-01-18 Philips Electronics Uk Limited Data demodulator for a direct frequency modulated signal

Cited By (7)

* 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)
FR2464603A1 (en) * 1979-09-04 1981-03-06 Int Standard Electric Corp RADIO COMMUNICATION RECEIVER IN FREQUENCY DISPLACEMENT MODULATION
EP0070695A2 (en) * 1981-07-16 1983-01-26 International Standard Electric Corporation Radio receiver for frequency shift keyed signals
EP0070695A3 (en) * 1981-07-16 1984-05-30 International Standard Electric Corporation Radio receiver for frequency shift keyed signals
EP0098665A2 (en) * 1982-07-07 1984-01-18 Philips Electronics Uk Limited Data demodulator for a direct frequency modulated signal
GB2124046A (en) * 1982-07-07 1984-02-08 Philips Electronic Associated Data demodulator for a direct frequency modulated signal
EP0098665A3 (en) * 1982-07-07 1984-05-30 Philips Electronics Uk Limited Data demodulator for a direct frequency modulated signal

Also Published As

Publication number Publication date
DE1462403A1 (en) 1968-12-19

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