JPS56143728A - Detecting circuit for out-band signal or noise - Google Patents

Detecting circuit for out-band signal or noise

Info

Publication number
JPS56143728A
JPS56143728A JP4711880A JP4711880A JPS56143728A JP S56143728 A JPS56143728 A JP S56143728A JP 4711880 A JP4711880 A JP 4711880A JP 4711880 A JP4711880 A JP 4711880A JP S56143728 A JPS56143728 A JP S56143728A
Authority
JP
Japan
Prior art keywords
circuit
filter
circuits
detecting circuit
constitution
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
JP4711880A
Other languages
Japanese (ja)
Inventor
Yasuhiro Kumagai
Hiroyuki Hasegawa
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 JP4711880A priority Critical patent/JPS56143728A/en
Publication of JPS56143728A publication Critical patent/JPS56143728A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/06—Receivers
    • H04B1/10—Means associated with receiver for limiting or suppressing noise or interference

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Diaphragms For Cameras (AREA)
  • Noise Elimination (AREA)

Abstract

PURPOSE:To detect precisely the existence of a frequency component outside of a specific band, by managing with only one filter when the filter requires complicate constitution, by constituting simply a detecting circuit by using one filter and a few peripheral circuits. CONSTITUTION:An input signal is led out from both the input terminal and output terminal of by-pass filter 1 and applied to rectifying circuits 2 and 3, respectively. Then, adding circuit 4 adds together outputs of circuits 2 and 3 to obtain voltages which are to cancel mutually. Integral network 5 extracts the mean DC voltage of the output voltage of circuit 4. The comparison potential of circuit 5 (discriminating circuit) is determined and if a signal containing out-band components exceeding some amount is inputted and surpasses the comparison potential, it can be detected by comparing circuit 6. Thus, the detecting circuit or discriminating circuit can be composed of one filter and simple peripheral circuits only.
JP4711880A 1980-04-10 1980-04-10 Detecting circuit for out-band signal or noise Pending JPS56143728A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4711880A JPS56143728A (en) 1980-04-10 1980-04-10 Detecting circuit for out-band signal or noise

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4711880A JPS56143728A (en) 1980-04-10 1980-04-10 Detecting circuit for out-band signal or noise

Publications (1)

Publication Number Publication Date
JPS56143728A true JPS56143728A (en) 1981-11-09

Family

ID=12766242

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4711880A Pending JPS56143728A (en) 1980-04-10 1980-04-10 Detecting circuit for out-band signal or noise

Country Status (1)

Country Link
JP (1) JPS56143728A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61154526U (en) * 1985-03-18 1986-09-25
JP2006025273A (en) * 2004-07-09 2006-01-26 Hitachi Kokusai Denki Engineering:Kk Noise squelch circuit
JP2008058401A (en) * 2006-08-29 2008-03-13 Canon Inc Controller and imaging apparatus
JP2008058402A (en) * 2006-08-29 2008-03-13 Canon Inc Control device and imaging apparatus

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5533335A (en) * 1978-08-31 1980-03-08 Fujitsu Ltd Signaling signal detection system

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5533335A (en) * 1978-08-31 1980-03-08 Fujitsu Ltd Signaling signal detection system

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61154526U (en) * 1985-03-18 1986-09-25
JP2006025273A (en) * 2004-07-09 2006-01-26 Hitachi Kokusai Denki Engineering:Kk Noise squelch circuit
JP4625278B2 (en) * 2004-07-09 2011-02-02 株式会社五洋電子 Noise squelch circuit
JP2008058401A (en) * 2006-08-29 2008-03-13 Canon Inc Controller and imaging apparatus
JP2008058402A (en) * 2006-08-29 2008-03-13 Canon Inc Control device and imaging apparatus

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