JPS55145461A - Digital signal/noise ratio monitoring device - Google Patents

Digital signal/noise ratio monitoring device

Info

Publication number
JPS55145461A
JPS55145461A JP5269279A JP5269279A JPS55145461A JP S55145461 A JPS55145461 A JP S55145461A JP 5269279 A JP5269279 A JP 5269279A JP 5269279 A JP5269279 A JP 5269279A JP S55145461 A JPS55145461 A JP S55145461A
Authority
JP
Japan
Prior art keywords
circuit
output
pulse
branch
held
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
JP5269279A
Other languages
Japanese (ja)
Other versions
JPS642259B2 (en
Inventor
Yoshihiko Akaiwa
Ichiro Takase
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 JP5269279A priority Critical patent/JPS55145461A/en
Publication of JPS55145461A publication Critical patent/JPS55145461A/en
Publication of JPS642259B2 publication Critical patent/JPS642259B2/ja
Granted legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/20—Arrangements for detecting or preventing errors in the information received using signal quality detector

Landscapes

  • Engineering & Computer Science (AREA)
  • Quality & Reliability (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
  • Dc Digital Transmission (AREA)

Abstract

PURPOSE:To realize the constitution with the digital circuit by branching the output of one reproducing circuit into at least two parts and then comparing the states of the two signals with the time shifted to count the number of disagreement, thus facilitating the IC formation. CONSTITUTION:The output of the carrier reproducing circuit or the clock reproducing circuit is applied to input terminal 51. The input signal is branched into three branches, and the input of the 2nd branch is sample-held by sampling circuit 53 at the rising time of the output pulse of delay circuit 52 of the 1st branch. The input of the 3rd branch is held by sampling circuit 55 at the rising time of the output pulse of delay circuit 54. These two sample-held signals are supplied to exclusive logic sum circuit 57, and the output of circuit 57 is punched at sampling circuit 58 and via the pulse of delay circuit 56. And the short pulse is generated in the case of disagreement. This short pulse is counted for a fixed time by counter 59, and the scale of S/N can be presumed based on the scale of the count value.
JP5269279A 1979-04-27 1979-04-27 Digital signal/noise ratio monitoring device Granted JPS55145461A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP5269279A JPS55145461A (en) 1979-04-27 1979-04-27 Digital signal/noise ratio monitoring device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP5269279A JPS55145461A (en) 1979-04-27 1979-04-27 Digital signal/noise ratio monitoring device

Publications (2)

Publication Number Publication Date
JPS55145461A true JPS55145461A (en) 1980-11-13
JPS642259B2 JPS642259B2 (en) 1989-01-17

Family

ID=12921934

Family Applications (1)

Application Number Title Priority Date Filing Date
JP5269279A Granted JPS55145461A (en) 1979-04-27 1979-04-27 Digital signal/noise ratio monitoring device

Country Status (1)

Country Link
JP (1) JPS55145461A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5810946A (en) * 1981-07-14 1983-01-21 Fujitsu Ltd Signal interruption detecting system
JPS5974756A (en) * 1982-10-21 1984-04-27 Kokusai Denshin Denwa Co Ltd <Kdd> Monitoring device of signal quality
JPS59161136A (en) * 1983-03-04 1984-09-11 Nippon Telegr & Teleph Corp <Ntt> Jitter detecting type communication supervising method
JPS6046155A (en) * 1983-08-23 1985-03-12 Nec Corp Squelch signal generating circuit
US5840022A (en) * 1993-03-22 1998-11-24 Siemens Aktiengesellschaft Method for imaging display of a part of the human body

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS51140503A (en) * 1975-05-30 1976-12-03 Nippon Telegr & Teleph Corp <Ntt> S/n discriminating circuit
JPS52126737U (en) * 1976-03-24 1977-09-27
JPS5315175A (en) * 1976-07-27 1978-02-10 Nippon Telegr & Teleph Corp <Ntt> Jitter measuring instrument

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS51140503A (en) * 1975-05-30 1976-12-03 Nippon Telegr & Teleph Corp <Ntt> S/n discriminating circuit
JPS52126737U (en) * 1976-03-24 1977-09-27
JPS5315175A (en) * 1976-07-27 1978-02-10 Nippon Telegr & Teleph Corp <Ntt> Jitter measuring instrument

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5810946A (en) * 1981-07-14 1983-01-21 Fujitsu Ltd Signal interruption detecting system
JPS5974756A (en) * 1982-10-21 1984-04-27 Kokusai Denshin Denwa Co Ltd <Kdd> Monitoring device of signal quality
JPS59161136A (en) * 1983-03-04 1984-09-11 Nippon Telegr & Teleph Corp <Ntt> Jitter detecting type communication supervising method
JPS6046155A (en) * 1983-08-23 1985-03-12 Nec Corp Squelch signal generating circuit
US5840022A (en) * 1993-03-22 1998-11-24 Siemens Aktiengesellschaft Method for imaging display of a part of the human body

Also Published As

Publication number Publication date
JPS642259B2 (en) 1989-01-17

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