GB1517121A - Radio receiver for fsk signals - Google Patents

Radio receiver for fsk signals

Info

Publication number
GB1517121A
GB1517121A GB135877A GB135877A GB1517121A GB 1517121 A GB1517121 A GB 1517121A GB 135877 A GB135877 A GB 135877A GB 135877 A GB135877 A GB 135877A GB 1517121 A GB1517121 A GB 1517121A
Authority
GB
United Kingdom
Prior art keywords
output
input
flop
signal
khz
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
GB135877A
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.)
STC PLC
Original Assignee
Standard Telephone and Cables PLC
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 Standard Telephone and Cables PLC filed Critical Standard Telephone and Cables PLC
Priority to GB135877A priority Critical patent/GB1517121A/en
Priority to DE19782800253 priority patent/DE2800253A1/en
Priority to BE2057141A priority patent/BE868898A/en
Publication of GB1517121A publication Critical patent/GB1517121A/en
Priority to HK16283A priority patent/HK16283A/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

Landscapes

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

Abstract

1517121 Data transmission; F.S.K. receivers STANDARD TELEPHONES & CABLES Ltd 13 Jan 1977 1358/77 Heading H4P An F.S.K. radio receiver comprises first and second signal paths A, B each including a mixer circuit 1 or 2 followed by a low pass filter 5 or 6 and a limiting amplifier 7 or 8. A local oscillator 3 running at the carrier frequency fc of the received signal is connected directly to mixer circuit 1 and through a 90‹ phase shift circuit 4, e.g. an RC circuit, to the other mixer circuit 2. The outputs from the amplifiers 7 and 8 are connected respectively to the CK and D inputs of a D-type flip-flop 9 having an output Q. In operation, the received signals have a' frequency fc Œ # kHz where # is the FSK modulation deviation; when the signal is offset by + # kHz the arrangement is such that the amplifiers deliver two square waves in quadrature and this quadrature phase shift is reversed when the offset shifts to -# kHz. The flipflop 9 is positive-edge triggered on the CK input to give a one or a zero at the Q output, whichever is present at the D input during the clock transition. The receiver thus produces a logical output, representative of the original modulation, depending whether the input signal is high or low of the local oscillator. The wave-forms associated with the operation of the flip-flop 9 are described with reference to Fig. 2 (not shown). In a modification a second D-type flip-flop is provided with amplifier 8 connected to its CK input and amplifier 7 connected to its D input, the Q output of one flipflop and the Q output of the other flip-flop being added algebraically. It is stated that this arrangement improves error-rate performance at low signal to noise ratios.
GB135877A 1977-01-13 1977-01-13 Radio receiver for fsk signals Expired GB1517121A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
GB135877A GB1517121A (en) 1977-01-13 1977-01-13 Radio receiver for fsk signals
DE19782800253 DE2800253A1 (en) 1977-01-13 1978-01-04 RADIO RECEIVER
BE2057141A BE868898A (en) 1977-01-13 1978-07-11 RADIO RECEIVER FOR DISCREET FREQUENCY MODULATION SIGNALS ON A RADIO CARRIER
HK16283A HK16283A (en) 1977-01-13 1983-05-12 Radio receiver for fsk signals

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB135877A GB1517121A (en) 1977-01-13 1977-01-13 Radio receiver for fsk signals

Publications (1)

Publication Number Publication Date
GB1517121A true GB1517121A (en) 1978-07-12

Family

ID=9720633

Family Applications (1)

Application Number Title Priority Date Filing Date
GB135877A Expired GB1517121A (en) 1977-01-13 1977-01-13 Radio receiver for fsk signals

Country Status (4)

Country Link
BE (1) BE868898A (en)
DE (1) DE2800253A1 (en)
GB (1) GB1517121A (en)
HK (1) HK16283A (en)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2440124A1 (en) * 1978-10-24 1980-05-23 Int Standard Electric Corp RADIO RECEIVER FOR SOUND FREQUENCY MODULES
FR2464603A1 (en) * 1979-09-04 1981-03-06 Int Standard Electric Corp RADIO COMMUNICATION RECEIVER IN FREQUENCY DISPLACEMENT MODULATION
GB2141007A (en) * 1983-06-02 1984-12-05 Standard Telephones Cables Ltd Demodulator logic for frequency shift keyed signals
EP0151334A2 (en) * 1983-07-14 1985-08-14 Stc Plc Direct conversion frequency modulation radio receiver
US4605903A (en) * 1985-11-07 1986-08-12 Motorola, Inc. FSK demodulator with high noise immunity digital phase detector
EP0197708A2 (en) * 1985-04-03 1986-10-15 Stc Plc Digital zero IF circuit
US4672640A (en) * 1984-03-01 1987-06-09 Standard Telephones & Cables Public Limited Company Radio receiver
GB2189114A (en) * 1986-02-12 1987-10-14 Plessey Co Plc Radio receivers

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3412190C2 (en) * 1984-04-02 1986-12-18 Telefunken electronic GmbH, 7100 Heilbronn Integrable receiver circuit
DE3733967A1 (en) * 1987-10-08 1989-04-27 Bermbach Rainer Quadrature superposition method for demodulating the carrier-frequency received signal in radio clock receivers

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1278559B (en) * 1966-04-30 1968-09-26 Standard Elektrik Lorenz Ag Receiver for frequency-modulated signals
DE1616312B2 (en) * 1968-01-25 1973-10-18 Helmut 8000 Muenchen Spieler Single sideband transmission device according to the third method
DE2358288A1 (en) * 1973-11-22 1975-06-05 Standard Elektrik Lorenz Ag RECEIVER FOR FREQUENCY-MODULATED HF SIGNALS
GB1530602A (en) * 1975-10-14 1978-11-01 Standard Telephones Cables Ltd Demodulator for fm signals

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4254503A (en) * 1978-10-24 1981-03-03 International Standard Electric Corporation Radio receiver for tone modulated signals
FR2440124A1 (en) * 1978-10-24 1980-05-23 Int Standard Electric Corp RADIO RECEIVER FOR SOUND FREQUENCY MODULES
FR2464603A1 (en) * 1979-09-04 1981-03-06 Int Standard Electric Corp RADIO COMMUNICATION RECEIVER IN FREQUENCY DISPLACEMENT MODULATION
GB2141007A (en) * 1983-06-02 1984-12-05 Standard Telephones Cables Ltd Demodulator logic for frequency shift keyed signals
US4571738A (en) * 1983-06-02 1986-02-18 Standard Telephones And Cables Plc Demodulator logic for frequency shift keyed signals
EP0151334A3 (en) * 1983-07-14 1986-11-20 Stc Plc Direct conversion frequency modulation radio receiver
EP0151334A2 (en) * 1983-07-14 1985-08-14 Stc Plc Direct conversion frequency modulation radio receiver
US4672640A (en) * 1984-03-01 1987-06-09 Standard Telephones & Cables Public Limited Company Radio receiver
EP0197708A2 (en) * 1985-04-03 1986-10-15 Stc Plc Digital zero IF circuit
EP0197708A3 (en) * 1985-04-03 1988-01-13 Stc Plc Digital zero if circuit
US4605903A (en) * 1985-11-07 1986-08-12 Motorola, Inc. FSK demodulator with high noise immunity digital phase detector
GB2189114A (en) * 1986-02-12 1987-10-14 Plessey Co Plc Radio receivers
GB2189114B (en) * 1986-02-12 1990-03-14 Plessey Co Plc Radio receivers

Also Published As

Publication number Publication date
DE2800253C2 (en) 1987-01-15
BE868898A (en) 1978-11-03
DE2800253A1 (en) 1978-07-20
HK16283A (en) 1983-05-20

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Legal Events

Date Code Title Description
PS Patent sealed
PE20 Patent expired after termination of 20 years

Effective date: 19970112