JPS5675738A - Line monitor - Google Patents

Line monitor

Info

Publication number
JPS5675738A
JPS5675738A JP15159879A JP15159879A JPS5675738A JP S5675738 A JPS5675738 A JP S5675738A JP 15159879 A JP15159879 A JP 15159879A JP 15159879 A JP15159879 A JP 15159879A JP S5675738 A JPS5675738 A JP S5675738A
Authority
JP
Japan
Prior art keywords
signal
monitoring signal
inverse
superimposed
transmission
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
JP15159879A
Other languages
Japanese (ja)
Inventor
Hideo Nagashima
Fuyuji Kano
Kazuo Okamura
Koji Yoshii
Shunei Takasago
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.)
IRIICHI TSUSHIN KOGYO KK
IRIICHI TSUUSHIN KOGYO KK
Nippon Telegraph and Telephone Corp
Original Assignee
IRIICHI TSUSHIN KOGYO KK
IRIICHI TSUUSHIN KOGYO KK
Nippon Telegraph and Telephone Corp
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 IRIICHI TSUSHIN KOGYO KK, IRIICHI TSUUSHIN KOGYO KK, Nippon Telegraph and Telephone Corp filed Critical IRIICHI TSUSHIN KOGYO KK
Priority to JP15159879A priority Critical patent/JPS5675738A/en
Publication of JPS5675738A publication Critical patent/JPS5675738A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B3/00—Line transmission systems
    • H04B3/02—Details
    • H04B3/46—Monitoring; Testing

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Monitoring And Testing Of Transmission In General (AREA)

Abstract

PURPOSE:To reduce a bad influence on transmission signal, even without the presence of vacant transmission band, by cancelling the monitoring signal through the application of inverse monitoring signal of the antiphase and the same amplitude as the monitoring signal extracted from superimposed signals to them. CONSTITUTION:A superimposed signal is received at an AGC73. The superimposed signal is split into two at a distributor 61 and filtered at a band pass filter 71. The phase delayed at the band pass filter 71 is advanced and the phase is inverted for the signal, which is represented at the output of a PLL oscillator 72 as an inverse monitoring signal 94. This inverse monitoring signal 94 and the monitoring signal 93 from the output 611 of the branch device 61 are added at a cancellation circuit 81, the monitoring signal 93 is disappeared, and only the transmission signal 91 is fed to one terminal 51.
JP15159879A 1979-11-22 1979-11-22 Line monitor Pending JPS5675738A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP15159879A JPS5675738A (en) 1979-11-22 1979-11-22 Line monitor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP15159879A JPS5675738A (en) 1979-11-22 1979-11-22 Line monitor

Publications (1)

Publication Number Publication Date
JPS5675738A true JPS5675738A (en) 1981-06-23

Family

ID=15522018

Family Applications (1)

Application Number Title Priority Date Filing Date
JP15159879A Pending JPS5675738A (en) 1979-11-22 1979-11-22 Line monitor

Country Status (1)

Country Link
JP (1) JPS5675738A (en)

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