JPS57152755A - Transmission quality monitoring device - Google Patents

Transmission quality monitoring device

Info

Publication number
JPS57152755A
JPS57152755A JP3722881A JP3722881A JPS57152755A JP S57152755 A JPS57152755 A JP S57152755A JP 3722881 A JP3722881 A JP 3722881A JP 3722881 A JP3722881 A JP 3722881A JP S57152755 A JPS57152755 A JP S57152755A
Authority
JP
Japan
Prior art keywords
base band
band signals
oscilloscope
signals
bright points
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
JP3722881A
Other languages
Japanese (ja)
Inventor
Kazuo Suzuka
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.)
Hitachi Denshi KK
Original Assignee
Hitachi Denshi KK
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 Hitachi Denshi KK filed Critical Hitachi Denshi KK
Priority to JP3722881A priority Critical patent/JPS57152755A/en
Publication of JPS57152755A publication Critical patent/JPS57152755A/en
Pending legal-status Critical Current

Links

Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00Arrangements for detecting or preventing errors in the information received
    • H04L1/20Arrangements for detecting or preventing errors in the information received using signal quality detector
    • H04L1/206Arrangements for detecting or preventing errors in the information received using signal quality detector for modulated signals

Abstract

PURPOSE:To monitor the quality of signals, by sampling and holding in-phase and orthogonal base band signals obtained by detection of a differential phase modulation signal and inputting these base band signals to horizontal and vertical axes of an oscilloscope to observe bright points. CONSTITUTION:A differential phase modulation signal is detected to obtain in-phase and orthogonal base band signals Sb1 and Sb2, and these base band signals are inputted to sampling hold circuits SH1 and SH2 and are sampled and held by sampling pulses PS synchronized with a timing signal. Sampled and held signals SX and SY are inputted to input terminals of horizontal and vertical axes of an oscilloscope, and the state of bright points is observed on the oscilloscope. Bright points become as shown in figure A for a high quality of the receiving signal and becomes as shown in figure B for a low quality.
JP3722881A 1981-03-17 1981-03-17 Transmission quality monitoring device Pending JPS57152755A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP3722881A JPS57152755A (en) 1981-03-17 1981-03-17 Transmission quality monitoring device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP3722881A JPS57152755A (en) 1981-03-17 1981-03-17 Transmission quality monitoring device

Publications (1)

Publication Number Publication Date
JPS57152755A true JPS57152755A (en) 1982-09-21

Family

ID=12491737

Family Applications (1)

Application Number Title Priority Date Filing Date
JP3722881A Pending JPS57152755A (en) 1981-03-17 1981-03-17 Transmission quality monitoring device

Country Status (1)

Country Link
JP (1) JPS57152755A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4918708A (en) * 1986-03-17 1990-04-17 Hewlett-Packard Company Analysis of digital radio transmissions

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4918708A (en) * 1986-03-17 1990-04-17 Hewlett-Packard Company Analysis of digital radio transmissions

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