JPS561634A - Equalizer - Google Patents

Equalizer

Info

Publication number
JPS561634A
JPS561634A JP7781379A JP7781379A JPS561634A JP S561634 A JPS561634 A JP S561634A JP 7781379 A JP7781379 A JP 7781379A JP 7781379 A JP7781379 A JP 7781379A JP S561634 A JPS561634 A JP S561634A
Authority
JP
Japan
Prior art keywords
signal
circuit
distortion
delay
homega
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
JP7781379A
Other languages
Japanese (ja)
Inventor
Seijiro Yokoyama
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 JP7781379A priority Critical patent/JPS561634A/en
Publication of JPS561634A publication Critical patent/JPS561634A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/015—Reducing echo effects

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Filters And Equalizers (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
  • Filters That Use Time-Delay Elements (AREA)

Abstract

PURPOSE:To secure the safe elimination of the amplitude distortion and the delay distortion which are caused by the multipath propagation, by selecting properly the attenuation factor, the phase transition amount and the delay amount each. CONSTITUTION:The input signal at signal input terminal 11 is referred to as Ei, and the output signal at signal output terminal 18 is as Eo each. Thus in order to turn signal Ei receiving the multipath distortion into nondistortion signal Eio, the transmission function Homega of the circuit is set so as to secure Homega=1 in relation to Eo=HomegaXEi. For this purpose, attenuation factor (k) of attenuation circuit 13 is set equal to amplitude ratio (g) of the reflected wave to the main wave. And the equation of omegagamma+phi=omegalambda is satisfied, where the delay time of delay circuit 16 is gamma, the phase transition amount of phase-shift circuit 17 is phi, the propagation time difference is lambda between the main wave and the reflected wave, and the angle frequency is omega respectively. As a result, the signal which is perfectly free from the distortion can be obtained. The amplification factor of amplifying circuit 15 is set to 1/k.
JP7781379A 1979-06-20 1979-06-20 Equalizer Pending JPS561634A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP7781379A JPS561634A (en) 1979-06-20 1979-06-20 Equalizer

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7781379A JPS561634A (en) 1979-06-20 1979-06-20 Equalizer

Publications (1)

Publication Number Publication Date
JPS561634A true JPS561634A (en) 1981-01-09

Family

ID=13644455

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7781379A Pending JPS561634A (en) 1979-06-20 1979-06-20 Equalizer

Country Status (1)

Country Link
JP (1) JPS561634A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6043928A (en) * 1983-08-20 1985-03-08 Fujitsu Ltd Automatic frequency distortion compensating device
JPS60142630A (en) * 1983-12-28 1985-07-27 Fujitsu Ltd Compensating device of propagation distorsion
US7974799B2 (en) 2006-02-14 2011-07-05 Fujitsu Limited Backboard transmission method, backboard transmission apparatus, and substrate unit

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6043928A (en) * 1983-08-20 1985-03-08 Fujitsu Ltd Automatic frequency distortion compensating device
JPS60142630A (en) * 1983-12-28 1985-07-27 Fujitsu Ltd Compensating device of propagation distorsion
US7974799B2 (en) 2006-02-14 2011-07-05 Fujitsu Limited Backboard transmission method, backboard transmission apparatus, and substrate unit

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