JPS561631A - Detecting system for automatic equalizer training signal - Google Patents

Detecting system for automatic equalizer training signal

Info

Publication number
JPS561631A
JPS561631A JP7654179A JP7654179A JPS561631A JP S561631 A JPS561631 A JP S561631A JP 7654179 A JP7654179 A JP 7654179A JP 7654179 A JP7654179 A JP 7654179A JP S561631 A JPS561631 A JP S561631A
Authority
JP
Japan
Prior art keywords
signal
level
circuit
output
automatic equalizer
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
JP7654179A
Other languages
Japanese (ja)
Inventor
Kenji Inoue
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 JP7654179A priority Critical patent/JPS561631A/en
Publication of JPS561631A publication Critical patent/JPS561631A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
    • H04L25/03006—Arrangements for removing intersymbol interference
    • H04L25/03012—Arrangements for removing intersymbol interference operating in the time domain
    • H04L25/03114—Arrangements for removing intersymbol interference operating in the time domain non-adaptive, i.e. not adjustable, manually adjustable, or adjustable only during the reception of special signals
    • H04L25/03133—Arrangements for removing intersymbol interference operating in the time domain non-adaptive, i.e. not adjustable, manually adjustable, or adjustable only during the reception of special signals with a non-recursive structure

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)

Abstract

PURPOSE:To detect the training signal for setting the characteristics of the automatic equalizer, by making effective the output of the level deciding circuit only when the reception signal level is higher than the prescribed level and then starting the detection for the fixed segment advised by CCIT. CONSTITUTION:The signal sent from input terminal 11 is demodulated at demodulator circuit 24, and the demodulated in-phase signal and the orthogonal signal are obtained at terminals 25 and 26 each. Then the square sum is produced through envelope signal producing circuit 27 for both the demodulated in-phase signal and the orthogonal signal. On the other hand, the reception signal from terminal 11 undergoes the level decision by reception signal level detector 12, and the logic product is obtained through AND logic circuit 29 between the above decision output and the output of level deciding circuit 28. Then the output of circuit 28 is made effective only when the reception signal level is higher than the prescribed value, and thus the detection is started for the fixed segment advised by CCIT. In this way, the training signal can be detected for setting the characteristics of the automatic equalizer.
JP7654179A 1979-06-18 1979-06-18 Detecting system for automatic equalizer training signal Pending JPS561631A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP7654179A JPS561631A (en) 1979-06-18 1979-06-18 Detecting system for automatic equalizer training signal

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7654179A JPS561631A (en) 1979-06-18 1979-06-18 Detecting system for automatic equalizer training signal

Publications (1)

Publication Number Publication Date
JPS561631A true JPS561631A (en) 1981-01-09

Family

ID=13608122

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7654179A Pending JPS561631A (en) 1979-06-18 1979-06-18 Detecting system for automatic equalizer training signal

Country Status (1)

Country Link
JP (1) JPS561631A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4608703A (en) * 1983-05-12 1986-08-26 Ricoh Company, Ltd. Synchronization detection system for data transmission

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4608703A (en) * 1983-05-12 1986-08-26 Ricoh Company, Ltd. Synchronization detection system for data transmission

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