JPS57176846A - Noise removing circuit - Google Patents
Noise removing circuitInfo
- 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
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.
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)
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)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0231993U (en) * | 1988-08-25 | 1990-02-28 |
-
1981
- 1981-04-22 JP JP56061053A patent/JPS57176846A/en active Granted
Cited By (2)
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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