JPS5868330A - Detecting circuit for identical frequency interference - Google Patents

Detecting circuit for identical frequency interference

Info

Publication number
JPS5868330A
JPS5868330A JP16677881A JP16677881A JPS5868330A JP S5868330 A JPS5868330 A JP S5868330A JP 16677881 A JP16677881 A JP 16677881A JP 16677881 A JP16677881 A JP 16677881A JP S5868330 A JPS5868330 A JP S5868330A
Authority
JP
Grant status
Application
Patent type
Prior art keywords
signal
electric power
wave
showing
interference
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.)
Pending
Application number
JP16677881A
Other versions
JPS6359612B2 (en )
Inventor
Toshio Miki
Original Assignee
Nippon Telegr & Teleph Corp <Ntt>
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

Links

Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B1/00Details 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
    • H04B1/06Receivers
    • H04B1/10Means associated with receiver for limiting or suppressing noise or interference induced by transmission

Abstract

PURPOSE:To an interference detecting signal corresponding to the electric power ratio of an interference wave to a desired wave under no influence of variation in reception level, by detecting the beat signal of the composite wave of the desired wave and interference wave. CONSTITUTION:In a receiver used for digital communication which employs an angle modulation system, a received signal applied to a terminal 10 is converted by a square-law detector 11 into a signal 17 showing momentary received electric power to obtain a signal showing the amplitude of the received signal, which is applied to an HPF12 and an LPF13. The HPF12 outputs a signal 18 showing momentary received electric power while the DC component of received electric power and the variation component due to fading are removed, and the LPF13 outputs a signal 19 showing mean received electric power which contains the variation component due to the fading to apply them to a divider 14 respectively. The output of the divider 14 is converted by an envelope detector 15 into an envelope voltage, so that an identical frequency interference detecting signal voltage corresponding to the electric power ratio of an interference wave to a desired wave is developed at a terminal 16.
JP16677881A 1981-10-19 1981-10-19 Expired JPS6359612B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP16677881A JPS6359612B2 (en) 1981-10-19 1981-10-19

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP16677881A JPS6359612B2 (en) 1981-10-19 1981-10-19

Publications (2)

Publication Number Publication Date
JPS5868330A true true JPS5868330A (en) 1983-04-23
JPS6359612B2 JPS6359612B2 (en) 1988-11-21

Family

ID=15837504

Family Applications (1)

Application Number Title Priority Date Filing Date
JP16677881A Expired JPS6359612B2 (en) 1981-10-19 1981-10-19

Country Status (1)

Country Link
JP (1) JPS6359612B2 (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6043932A (en) * 1983-08-22 1985-03-08 Nec Corp Receiver
JPS63229927A (en) * 1987-03-18 1988-09-26 Sony Corp Fm communication equipment
JPH02222233A (en) * 1989-02-22 1990-09-05 Iwatsu Electric Co Ltd Same channel interference quantity measuring instrument
JPH02250438A (en) * 1989-03-24 1990-10-08 Kyowa Densetsu Kaisha Ltd Radio wave interference ratio measuring method and equipment using the method
US5901173A (en) * 1996-12-09 1999-05-04 Raytheon Company Noise Estimator

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6043932A (en) * 1983-08-22 1985-03-08 Nec Corp Receiver
JPH0446022B2 (en) * 1983-08-22 1992-07-28 Nippon Electric Co
JPS63229927A (en) * 1987-03-18 1988-09-26 Sony Corp Fm communication equipment
JPH02222233A (en) * 1989-02-22 1990-09-05 Iwatsu Electric Co Ltd Same channel interference quantity measuring instrument
JPH02250438A (en) * 1989-03-24 1990-10-08 Kyowa Densetsu Kaisha Ltd Radio wave interference ratio measuring method and equipment using the method
US5901173A (en) * 1996-12-09 1999-05-04 Raytheon Company Noise Estimator
US6094463A (en) * 1996-12-09 2000-07-25 Raytheon Company Phaselock threshold correction
US6229858B1 (en) 1996-12-09 2001-05-08 Raytheon Company Phaselock threshold correction

Also Published As

Publication number Publication date Type
JPS6359612B2 (en) 1988-11-21 grant

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