JPS55158761A - Alarm device for discrimination reproducing circuit - Google Patents

Alarm device for discrimination reproducing circuit

Info

Publication number
JPS55158761A
JPS55158761A JP6540679A JP6540679A JPS55158761A JP S55158761 A JPS55158761 A JP S55158761A JP 6540679 A JP6540679 A JP 6540679A JP 6540679 A JP6540679 A JP 6540679A JP S55158761 A JPS55158761 A JP S55158761A
Authority
JP
Japan
Prior art keywords
output
discrimination
voltage
noise
signal
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
JP6540679A
Other languages
Japanese (ja)
Inventor
Eiji Itaya
Tadayoshi Kato
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 JP6540679A priority Critical patent/JPS55158761A/en
Publication of JPS55158761A publication Critical patent/JPS55158761A/en
Pending 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)
  • Dc Digital Transmission (AREA)

Abstract

PURPOSE:To ensure the assured working of the alarm circuit without giving any effect to the output of the main signal, by providing another set of discrimination reproducing circuits of different threshold levels and in parallel each other. CONSTITUTION:The threshold voltage of comparators 3a and 3b are set to value B and D by variable resistors 6-1 and 6-2 each. And the level of voltage D is set to the higher value than the noise level and outside the discrimination uncertain width linking the upper and lower parts of voltage B. As a result, output OP-1 of comparator 6-1 has the signal containing the noise; while the output OP-2 of comparator 6-2 has the output signal which is not affected by the noise respectively. Accordingly, the output of logic circuit 5 delivers H when either output OP-1 or OP-2 becomes 1, and output L is obtained either one or both of the above outputs become O. Thus the clear detection is secured for the fault of discrimination reproducing circuit 1 or 3 or the OFF-state of the input signal if the alarm is set to be given in the case of output L.
JP6540679A 1979-05-26 1979-05-26 Alarm device for discrimination reproducing circuit Pending JPS55158761A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP6540679A JPS55158761A (en) 1979-05-26 1979-05-26 Alarm device for discrimination reproducing circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP6540679A JPS55158761A (en) 1979-05-26 1979-05-26 Alarm device for discrimination reproducing circuit

Publications (1)

Publication Number Publication Date
JPS55158761A true JPS55158761A (en) 1980-12-10

Family

ID=13286104

Family Applications (1)

Application Number Title Priority Date Filing Date
JP6540679A Pending JPS55158761A (en) 1979-05-26 1979-05-26 Alarm device for discrimination reproducing circuit

Country Status (1)

Country Link
JP (1) JPS55158761A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59239A (en) * 1982-06-25 1984-01-05 Nec Corp Pulse code modulation signal cut-off detecting circuit

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5394810A (en) * 1977-01-31 1978-08-19 Nec Corp Signal monitor system
JPS5431212A (en) * 1977-08-15 1979-03-08 Nec Corp Monitor circuit for digital signal transmission line

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5394810A (en) * 1977-01-31 1978-08-19 Nec Corp Signal monitor system
JPS5431212A (en) * 1977-08-15 1979-03-08 Nec Corp Monitor circuit for digital signal transmission line

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59239A (en) * 1982-06-25 1984-01-05 Nec Corp Pulse code modulation signal cut-off detecting circuit

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