JPS57181236A - Waveform amplification detecting system - Google Patents

Waveform amplification detecting system

Info

Publication number
JPS57181236A
JPS57181236A JP6552681A JP6552681A JPS57181236A JP S57181236 A JPS57181236 A JP S57181236A JP 6552681 A JP6552681 A JP 6552681A JP 6552681 A JP6552681 A JP 6552681A JP S57181236 A JPS57181236 A JP S57181236A
Authority
JP
Japan
Prior art keywords
amplifier
output
waveform
gain
circuit
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
JP6552681A
Other languages
Japanese (ja)
Other versions
JPS645774B2 (en
Inventor
Tadao Ogawa
Takemi Endo
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.)
Fujitsu Ltd
Original Assignee
Fujitsu 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 Fujitsu Ltd filed Critical Fujitsu Ltd
Priority to JP6552681A priority Critical patent/JPS57181236A/en
Publication of JPS57181236A publication Critical patent/JPS57181236A/en
Publication of JPS645774B2 publication Critical patent/JPS645774B2/ja
Granted legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B3/00—Line transmission systems
    • H04B3/02—Details
    • H04B3/04—Control of transmission; Equalising
    • H04B3/06—Control of transmission; Equalising by the transmitted signal
    • H04B3/08—Control of transmission; Equalising by the transmitted signal in negative-feedback path of line amplifier

Abstract

PURPOSE:To make the amplitude and waveform of an amplifier output constant by controlling the gain of an amplifier on the basis of a difference output between the positive and negative peak values of an input signal. CONSTITUTION:The output of a transmission-side amplifier 9 is supplied to a variable gain amplifier 13 through a transmission line 11. The output of the amplifier 13 is supplied to a subtracting circuit 18 through a branching circuit 15, a peak detector 16 for a positive-side waveform, and a peak detector 17 for a negative-side waveform. The output of the circuit 18 controls the gain of the amplifier 13 through a DC amplifier 19. Therefore, the outputs of the detectors 16 and 17 are processed by subtracting processing, so the influence of DC wanderings is canceled.
JP6552681A 1981-04-30 1981-04-30 Waveform amplification detecting system Granted JPS57181236A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP6552681A JPS57181236A (en) 1981-04-30 1981-04-30 Waveform amplification detecting system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP6552681A JPS57181236A (en) 1981-04-30 1981-04-30 Waveform amplification detecting system

Publications (2)

Publication Number Publication Date
JPS57181236A true JPS57181236A (en) 1982-11-08
JPS645774B2 JPS645774B2 (en) 1989-01-31

Family

ID=13289542

Family Applications (1)

Application Number Title Priority Date Filing Date
JP6552681A Granted JPS57181236A (en) 1981-04-30 1981-04-30 Waveform amplification detecting system

Country Status (1)

Country Link
JP (1) JPS57181236A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6133025A (en) * 1984-07-25 1986-02-15 Nec Corp Method and device for automatic gain control of spread spectrum signal
JPS6248839A (en) * 1985-08-28 1987-03-03 Hitachi Cable Ltd Optical reception circuit
JPS63120532A (en) * 1986-11-07 1988-05-24 Fujitsu Ltd Automatic gain control circuit
US5163172A (en) * 1988-11-14 1992-11-10 Kone Elevator Gmbh Procedure and apparatus for the measurement of the currents in a frequency converter

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0480660U (en) * 1990-11-21 1992-07-14

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6133025A (en) * 1984-07-25 1986-02-15 Nec Corp Method and device for automatic gain control of spread spectrum signal
JPS6248839A (en) * 1985-08-28 1987-03-03 Hitachi Cable Ltd Optical reception circuit
JPS63120532A (en) * 1986-11-07 1988-05-24 Fujitsu Ltd Automatic gain control circuit
JPH0564893B2 (en) * 1986-11-07 1993-09-16 Fujitsu Ltd
US5163172A (en) * 1988-11-14 1992-11-10 Kone Elevator Gmbh Procedure and apparatus for the measurement of the currents in a frequency converter

Also Published As

Publication number Publication date
JPS645774B2 (en) 1989-01-31

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