JPS6460222A - Carrier relay signal noise detection - Google Patents

Carrier relay signal noise detection

Info

Publication number
JPS6460222A
JPS6460222A JP62211262A JP21126287A JPS6460222A JP S6460222 A JPS6460222 A JP S6460222A JP 62211262 A JP62211262 A JP 62211262A JP 21126287 A JP21126287 A JP 21126287A JP S6460222 A JPS6460222 A JP S6460222A
Authority
JP
Japan
Prior art keywords
signal
period
circuit
zero
noise generation
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
JP62211262A
Other languages
Japanese (ja)
Inventor
Kazuhiko Kumagai
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
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 filed Critical NEC Corp
Priority to JP62211262A priority Critical patent/JPS6460222A/en
Publication of JPS6460222A publication Critical patent/JPS6460222A/en
Pending legal-status Critical Current

Links

Landscapes

  • Emergency Protection Circuit Devices (AREA)
  • Noise Elimination (AREA)

Abstract

PURPOSE:To exactly detect noise generation in an information transmission zone, by comparing the zero-cross period of received frequency deviation signal and the period of reference period signal with each other, and by discriminating the case where the periods are different from each other, to be of noise generation. CONSTITUTION:The carrier relay signal (a) of input to an input terminal 1 is converted to rectangular wave signal b by a Schmidt trigger circuit 2, and the input to monomulti-circuits 3, 4 and an inverter circuit 5 is provided at the same time. After that, by taking the AND of the output signals c, d of the monomulti-circuits 3, 4 in an AND circuit 6, the output of comparing reference period signal e is generated from the AND circuit 6. The reference period signal e, and signal f showing a zero-cross period generated via the inverter circuit 5 are compared with each other by a DFF circuit 7. Then, the zero-cross period of the frequency deviation signal of information signal is monitored by the signal f, and when the signal f is different from the signal e showing an original natural period, than it is discriminated as noise generation.
JP62211262A 1987-08-27 1987-08-27 Carrier relay signal noise detection Pending JPS6460222A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP62211262A JPS6460222A (en) 1987-08-27 1987-08-27 Carrier relay signal noise detection

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP62211262A JPS6460222A (en) 1987-08-27 1987-08-27 Carrier relay signal noise detection

Publications (1)

Publication Number Publication Date
JPS6460222A true JPS6460222A (en) 1989-03-07

Family

ID=16602998

Family Applications (1)

Application Number Title Priority Date Filing Date
JP62211262A Pending JPS6460222A (en) 1987-08-27 1987-08-27 Carrier relay signal noise detection

Country Status (1)

Country Link
JP (1) JPS6460222A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02174516A (en) * 1988-12-23 1990-07-05 Nec Corp Demodulation of carrier relay signal

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS551741A (en) * 1978-06-19 1980-01-08 Matsushita Electric Ind Co Ltd Receiver
JPS58253A (en) * 1981-06-24 1983-01-05 Seishin Seiyaku Kk Composition for ion exchange resin
JPS5849086A (en) * 1981-09-18 1983-03-23 Toshiba Corp Single phase reversible ac/dc converting circuit

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS551741A (en) * 1978-06-19 1980-01-08 Matsushita Electric Ind Co Ltd Receiver
JPS58253A (en) * 1981-06-24 1983-01-05 Seishin Seiyaku Kk Composition for ion exchange resin
JPS5849086A (en) * 1981-09-18 1983-03-23 Toshiba Corp Single phase reversible ac/dc converting circuit

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02174516A (en) * 1988-12-23 1990-07-05 Nec Corp Demodulation of carrier relay signal

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