JPS57185741A - Monitoring device for phase modulator - Google Patents

Monitoring device for phase modulator

Info

Publication number
JPS57185741A
JPS57185741A JP56070975A JP7097581A JPS57185741A JP S57185741 A JPS57185741 A JP S57185741A JP 56070975 A JP56070975 A JP 56070975A JP 7097581 A JP7097581 A JP 7097581A JP S57185741 A JPS57185741 A JP S57185741A
Authority
JP
Japan
Prior art keywords
signal
phase modulator
mixer
phase
monitoring device
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.)
Granted
Application number
JP56070975A
Other languages
Japanese (ja)
Other versions
JPS6232660B2 (en
Inventor
Kenji Mizoe
Tomio Sakuma
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.)
NEC Corp
Original Assignee
NEC Corp
Nippon Electric Co 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 NEC Corp, Nippon Electric Co Ltd filed Critical NEC Corp
Priority to JP56070975A priority Critical patent/JPS57185741A/en
Publication of JPS57185741A publication Critical patent/JPS57185741A/en
Publication of JPS6232660B2 publication Critical patent/JPS6232660B2/ja
Granted legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B14/00—Transmission systems not characterised by the medium used for transmission
    • H04B14/002—Transmission systems not characterised by the medium used for transmission characterised by the use of a carrier modulation
    • H04B14/006—Angle modulation

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
  • Monitoring And Testing Of Transmission In General (AREA)

Abstract

PURPOSE:To obtain a monitoring device for phase modulator with simple constitution, by using a characteristic in which a mixer is operated as a phase detector. CONSTITUTION:The outputs of an original oscillator 10 and a phase modulator 11 are respectively applied to a mixer 4 and a signal in a frequency difference between the frequency of a phase-modulated signal and a carrier from the oscillator 10 is obtained at an output terminal of said mixer, and the low frequency component corresponds to a modulated input signal. Thus, a signal applied to one of a comparator 8 via a low-pass filter 9 and an amplifier 7 is a modulated input signal component via the phase modulator 11 and since a signal applied another input terminal of the comparator 8 is the original modulation input signal, if the phase modulator has any failure, both of them are not coincident, and a failure signal is obtained at a terminal 14.
JP56070975A 1981-05-12 1981-05-12 Monitoring device for phase modulator Granted JPS57185741A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56070975A JPS57185741A (en) 1981-05-12 1981-05-12 Monitoring device for phase modulator

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56070975A JPS57185741A (en) 1981-05-12 1981-05-12 Monitoring device for phase modulator

Publications (2)

Publication Number Publication Date
JPS57185741A true JPS57185741A (en) 1982-11-16
JPS6232660B2 JPS6232660B2 (en) 1987-07-16

Family

ID=13447023

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56070975A Granted JPS57185741A (en) 1981-05-12 1981-05-12 Monitoring device for phase modulator

Country Status (1)

Country Link
JP (1) JPS57185741A (en)

Also Published As

Publication number Publication date
JPS6232660B2 (en) 1987-07-16

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