SE8103035L - RADIORECEIVER - Google Patents

RADIORECEIVER

Info

Publication number
SE8103035L
SE8103035L SE8103035A SE8103035A SE8103035L SE 8103035 L SE8103035 L SE 8103035L SE 8103035 A SE8103035 A SE 8103035A SE 8103035 A SE8103035 A SE 8103035A SE 8103035 L SE8103035 L SE 8103035L
Authority
SE
Sweden
Prior art keywords
mixer
local oscillator
signal
detector
fed
Prior art date
Application number
SE8103035A
Other languages
Unknown language ( )
Swedish (sv)
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 SE8103035L publication Critical patent/SE8103035L/en

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/06—Receivers
    • H04B1/16—Circuits
    • H04B1/26—Circuits for superheterodyne receivers
    • 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

Abstract

This invention relates to a radio receiver for receiving frequency shift keyed radio signals. The receiver has a mixer 2 which receives the transmitted signals, a local oscillator 3 which feeds a mixing signal to the mixer 2 and a detector 7 which is fed from the mixer 2 through a single receiving channel. A chopper 8 applies a chopping signal to the local oscillator 3 to change the frequency of the oscillator between two values none of which lies midway between the two frequencies, the chopping signal being fed also to the detector 7 in synchronism with that applied to the local oscillator 3 to logically compare the chopper signal with the mixer output so that the detector detects the transmitted binary bits. The invention is useful in the fields of paging, telemetry and communication systems. <IMAGE>
SE8103035A 1980-05-16 1981-05-14 RADIORECEIVER SE8103035L (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB8016220 1980-05-16
GB8028339A GB2076238B (en) 1980-05-16 1980-09-02 Radio receiver

Publications (1)

Publication Number Publication Date
SE8103035L true SE8103035L (en) 1981-11-17

Family

ID=26275533

Family Applications (1)

Application Number Title Priority Date Filing Date
SE8103035A SE8103035L (en) 1980-05-16 1981-05-14 RADIORECEIVER

Country Status (6)

Country Link
DE (1) DE3118852A1 (en)
DK (1) DK215781A (en)
FR (1) FR2482804A1 (en)
GB (1) GB2076238B (en)
NO (1) NO811615L (en)
SE (1) SE8103035L (en)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2086158B (en) * 1980-08-23 1984-05-02 Plessey Co Ltd Radio receiver
US4628518A (en) * 1981-08-20 1986-12-09 Plessey Overseas Limited Radio receiver
GB2146876B (en) * 1983-09-14 1987-03-04 Plessey Co Plc Fsk radio receiver
US5414736A (en) * 1991-08-12 1995-05-09 Matsushita Electric Industrial Co., Ltd. FSK data receiving system
GB9603660D0 (en) * 1996-02-21 1996-04-17 Cedardell Ltd Fm detection apparatus and method
CN1156987C (en) * 1996-05-28 2004-07-07 皇家菲利浦电子有限公司 a receiver, a demodulator and a demodulation method
US7308024B2 (en) 2000-02-28 2007-12-11 Thomson Licensing Modulation scheme for FDD/TDD transceivers
USD1014954S1 (en) * 2023-06-21 2024-02-20 Nike, Inc. Shoe

Family Cites Families (3)

* 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
DK120711B (en) * 1969-03-11 1971-07-05 Storno As Electrical circuit for detecting a tone signal.
US3899741A (en) * 1973-11-12 1975-08-12 Cermetek Inc Frequency shift keyed detector

Also Published As

Publication number Publication date
GB2076238A (en) 1981-11-25
NO811615L (en) 1981-11-17
GB2076238B (en) 1983-11-30
FR2482804A1 (en) 1981-11-20
DK215781A (en) 1981-11-17
DE3118852A1 (en) 1982-03-04

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Legal Events

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NAV Patent application has lapsed

Ref document number: 8103035-5

Effective date: 19830413