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SE8104972L - RECEIVER FOR HIGH FREQUENCY SIGNALS - Google Patents

RECEIVER FOR HIGH FREQUENCY SIGNALS

Info

Publication number
SE8104972L
SE8104972L SE8104972A SE8104972A SE8104972L SE 8104972 L SE8104972 L SE 8104972L SE 8104972 A SE8104972 A SE 8104972A SE 8104972 A SE8104972 A SE 8104972A SE 8104972 L SE8104972 L SE 8104972L
Authority
SE
Sweden
Prior art keywords
mixer
receiver
frequencies
transmitted
signals
Prior art date
Application number
SE8104972A
Other languages
Unknown language ( )
Swedish (sv)
Other versions
SE452832B (en
Inventor
P A K Moon
P E Chadwick
N C Thompson
Original Assignee
Plessey Overseas
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 Plessey Overseas filed Critical Plessey Overseas
Publication of SE8104972L publication Critical patent/SE8104972L/en
Publication of SE452832B publication Critical patent/SE452832B/en

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

Landscapes

  • Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Superheterodyne Receivers (AREA)
  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
  • Input Circuits Of Receivers And Coupling Of Receivers And Audio Equipment (AREA)
  • Structure Of Receivers (AREA)

Abstract

This invention relates to a radio receiver for receiving frequency shift keyed radio signals in which differing binary bits are transmitted at respective ones of two frequencies. The receiver has a mixer (2) which receives the transmitted signals and a local oscillator (3) which feeds a mixing signal to the mixer and is switchable between two frequencies neither of which lies midway between the two transmitted frequencies. A controlling switch (6) is fed with signals derived from the mixer (2) and switches the local oscillator (3) so as to maintain the frequency of the signal derived from the mixer (2) at a predetermined value. The invention is particularly useful in pagers. <IMAGE>
SE8104972A 1980-08-23 1981-08-21 RECEIVER FOR RECEIVING OF FREQUENCY CHANGE TRANSFER HIGH FREQUENCY SIGNALS SE452832B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB8027511A GB2086158B (en) 1980-08-23 1980-08-23 Radio receiver

Publications (2)

Publication Number Publication Date
SE8104972L true SE8104972L (en) 1982-02-24
SE452832B SE452832B (en) 1987-12-14

Family

ID=10515636

Family Applications (1)

Application Number Title Priority Date Filing Date
SE8104972A SE452832B (en) 1980-08-23 1981-08-21 RECEIVER FOR RECEIVING OF FREQUENCY CHANGE TRANSFER HIGH FREQUENCY SIGNALS

Country Status (7)

Country Link
DE (1) DE3132233A1 (en)
DK (1) DK155066C (en)
FR (1) FR2489059B1 (en)
GB (1) GB2086158B (en)
HK (1) HK48485A (en)
NO (1) NO152190C (en)
SE (1) SE452832B (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2137836B (en) * 1983-04-06 1986-07-23 Multitone Electronics Plc Fm demodulators
US4580101A (en) * 1983-04-06 1986-04-01 Multitone Electronics Plc FM demodulators with local oscillator frequency control circuits
GB2146876B (en) * 1983-09-14 1987-03-04 Plessey Co Plc Fsk radio receiver
SE470077B (en) * 1992-03-30 1993-11-01 Ericsson Ge Mobile Communicat Method and apparatus for demodulating a frequency modulated signal

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1172977A (en) * 1965-11-23 1969-12-03 Plessey Co Ltd Improvements in or relating to Demodulation Systems
US3414826A (en) * 1967-04-03 1968-12-03 Gen Electric Voltage-controlled oscillator
JPS5831065B2 (en) * 1976-04-09 1983-07-04 日本電気株式会社 FSK demodulator
GB2076238B (en) * 1980-05-16 1983-11-30 Plessey Co Ltd Radio receiver

Also Published As

Publication number Publication date
DK365181A (en) 1982-02-24
NO152190C (en) 1985-08-14
SE452832B (en) 1987-12-14
GB2086158B (en) 1984-05-02
FR2489059A1 (en) 1982-02-26
DK155066B (en) 1989-01-30
GB2086158A (en) 1982-05-06
NO812770L (en) 1982-02-24
FR2489059B1 (en) 1986-07-18
HK48485A (en) 1985-06-28
DK155066C (en) 1989-07-03
NO152190B (en) 1985-05-06
DE3132233C2 (en) 1991-10-02
DE3132233A1 (en) 1982-06-24

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