JPS5444859A - Detection system for zero intersecting point - Google Patents
Detection system for zero intersecting pointInfo
- Publication number
- JPS5444859A JPS5444859A JP11057977A JP11057977A JPS5444859A JP S5444859 A JPS5444859 A JP S5444859A JP 11057977 A JP11057977 A JP 11057977A JP 11057977 A JP11057977 A JP 11057977A JP S5444859 A JPS5444859 A JP S5444859A
- Authority
- JP
- Japan
- Prior art keywords
- output
- level
- zero
- input
- discrimination
- 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
Links
Landscapes
- Digital Magnetic Recording (AREA)
- Manipulation Of Pulses (AREA)
Abstract
PURPOSE: To prevent the generation of several zero intersections even if a high-frequency noise is contained in a data signal, and to reduce the deviation from the original detection output position, by feeding back the only AC signal from the zero intersection detection output to the input part.
CONSTITUTION: The output of the reading head is applied to differential comparator 33 via differentiator 5, and output 40 of comparator 33 varies (waveform E) so as to give a two-level output; and then, it is fed back to input 35 via resistance 37 and capacitor 38, thereby giving the discrimination level of a zero intersection by resistance 36. When output 40 varies from the ground potential to a positive voltage, the level potential of zero intersection discrimination is deviated by +a3 to the positive via resistance 37 and C38. For the purpose, the value of C38 is selected in order to make +a3 nearly equal to the ground potential within the time of one bit, so that C38 will feed only AC components back to input 35. As a result, the discrimination level voltage becomes 22 (waveform D) and a3 and a4 are fixed to 15 to 20% of the data signal, so that the generation of a plural number of detection outputs due to a high-frequency noise will be eliminated.
COPYRIGHT: (C)1979,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP11057977A JPS5444859A (en) | 1977-09-16 | 1977-09-16 | Detection system for zero intersecting point |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP11057977A JPS5444859A (en) | 1977-09-16 | 1977-09-16 | Detection system for zero intersecting point |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5444859A true JPS5444859A (en) | 1979-04-09 |
Family
ID=14539406
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP11057977A Pending JPS5444859A (en) | 1977-09-16 | 1977-09-16 | Detection system for zero intersecting point |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5444859A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2013029417A (en) * | 2011-07-28 | 2013-02-07 | Brother Ind Ltd | Zero-cross detection circuit and image forming device including the same |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5080750A (en) * | 1973-11-14 | 1975-07-01 |
-
1977
- 1977-09-16 JP JP11057977A patent/JPS5444859A/en active Pending
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5080750A (en) * | 1973-11-14 | 1975-07-01 |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2013029417A (en) * | 2011-07-28 | 2013-02-07 | Brother Ind Ltd | Zero-cross detection circuit and image forming device including the same |
US8912468B2 (en) | 2011-07-28 | 2014-12-16 | Brother Kogyo Kabushiki Kaisha | Zero-crossing detector circuit and image forming apparatus having the same |
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