JPS57176846A - Noise removing circuit - Google Patents

Noise removing circuit

Info

Publication number
JPS57176846A
JPS57176846A JP56061053A JP6105381A JPS57176846A JP S57176846 A JPS57176846 A JP S57176846A JP 56061053 A JP56061053 A JP 56061053A JP 6105381 A JP6105381 A JP 6105381A JP S57176846 A JPS57176846 A JP S57176846A
Authority
JP
Japan
Prior art keywords
signal
pulse
envelope
modulated
component
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
JP56061053A
Other languages
Japanese (ja)
Other versions
JPS6225397B2 (en
Inventor
Toshiyuki 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.)
TOUKIYOU JIYUUKI KOGYO KK
Juki Corp
Original Assignee
TOUKIYOU JIYUUKI KOGYO KK
Tokyo Juki Industrial 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 TOUKIYOU JIYUUKI KOGYO KK, Tokyo Juki Industrial Co Ltd filed Critical TOUKIYOU JIYUUKI KOGYO KK
Priority to JP56061053A priority Critical patent/JPS57176846A/en
Publication of JPS57176846A publication Critical patent/JPS57176846A/en
Publication of JPS6225397B2 publication Critical patent/JPS6225397B2/ja
Granted legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/60—Receivers

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Sewing Machines And Sewing (AREA)
  • Noise Elimination (AREA)

Abstract

PURPOSE:To remove noises caused by external illumination, by making an envelope of the peak voltage while the peak value of the pulse input signal is held, and outputting the difference between the signal obtained by fetching the AC component in the envelope and the input pulse. CONSTITUTION:If lights coming from outside illumination, etc., exist when a pulse light is generated from a luminescent device and a pulse-like photodetecting signal 2 is generated by receiving the light with a photodetector, the photodetecting signal is modulated and becomes a modulated signal MW. When the signal MW is inputted into a peak holding circuit 1, the circuit 1 fetches only the envelope of the signal MW and outputs a signal EW. Since the signal EW passes through the circuit 1, there is no lag between the phase of the signal EW and that of the signal 2. When the signal EW is passed through an HPF 3, only the AC component of the signal EW is fetched and the component becomes a signal HW. The signals HW and MW are inputted into a subtractor 4 and an output signal 5 of the difference is outputted. In this way, the output signal 5 in which noises caused by lights coming from outside are removed and which is not modulated is obtained.
JP56061053A 1981-04-22 1981-04-22 Noise removing circuit Granted JPS57176846A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56061053A JPS57176846A (en) 1981-04-22 1981-04-22 Noise removing circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56061053A JPS57176846A (en) 1981-04-22 1981-04-22 Noise removing circuit

Publications (2)

Publication Number Publication Date
JPS57176846A true JPS57176846A (en) 1982-10-30
JPS6225397B2 JPS6225397B2 (en) 1987-06-02

Family

ID=13160078

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56061053A Granted JPS57176846A (en) 1981-04-22 1981-04-22 Noise removing circuit

Country Status (1)

Country Link
JP (1) JPS57176846A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61279296A (en) * 1985-06-03 1986-12-10 プルボスト・ソシエテ・アノニム Apparatus for detecting thickness change of fabric and correction thereof

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0231993U (en) * 1988-08-25 1990-02-28

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61279296A (en) * 1985-06-03 1986-12-10 プルボスト・ソシエテ・アノニム Apparatus for detecting thickness change of fabric and correction thereof
JPH0234633B2 (en) * 1985-06-03 1990-08-06 Prouvost Sa

Also Published As

Publication number Publication date
JPS6225397B2 (en) 1987-06-02

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