JPS6488164A - Frequency detecting device - Google Patents
Frequency detecting deviceInfo
- Publication number
- JPS6488164A JPS6488164A JP24375887A JP24375887A JPS6488164A JP S6488164 A JPS6488164 A JP S6488164A JP 24375887 A JP24375887 A JP 24375887A JP 24375887 A JP24375887 A JP 24375887A JP S6488164 A JPS6488164 A JP S6488164A
- Authority
- JP
- Japan
- Prior art keywords
- frequency
- value
- sample
- sign
- inverted
- 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
- Measuring Frequencies, Analyzing Spectra (AREA)
Abstract
PURPOSE:To take a high-accuracy measurement of frequency even when the frequency varies by employing a rounding-off method for a process of calculating the frequency such as the arithmetic of an instantaneous value at an intermediate point of time according to a sample value when successive sampled values are inverted in sign. CONSTITUTION:The output voltage of a power generator is inputted to a CPU through a voltage transformer PT and an A/D converter. The CPU does not cut away below the decimal place of the instantaneous value a1 at the intermedi ate point of time found from successive sample values a1 and a2 which are inverted in sign, but adds a value half as large as a denominator at the time of division to a numerator and uses the value as a dividend to cut away below the decimal place, thereby performing rounding operation. Further, the zero point and frequency of input data are also calculated similarly to detect the frequency with high accuracy irrelevantly to a sample frequency.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24375887A JPS6488164A (en) | 1987-09-30 | 1987-09-30 | Frequency detecting device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24375887A JPS6488164A (en) | 1987-09-30 | 1987-09-30 | Frequency detecting device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6488164A true JPS6488164A (en) | 1989-04-03 |
Family
ID=17108547
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP24375887A Pending JPS6488164A (en) | 1987-09-30 | 1987-09-30 | Frequency detecting device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6488164A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104237633A (en) * | 2014-09-05 | 2014-12-24 | 许继集团有限公司 | Quick frequency measurement method |
| CN106597092A (en) * | 2016-10-13 | 2017-04-26 | 江苏海事职业技术学院 | High-precision anti-interference fixed-point computer three-phase voltage frequency measurement phase-locking algorithm |
-
1987
- 1987-09-30 JP JP24375887A patent/JPS6488164A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104237633A (en) * | 2014-09-05 | 2014-12-24 | 许继集团有限公司 | Quick frequency measurement method |
| CN106597092A (en) * | 2016-10-13 | 2017-04-26 | 江苏海事职业技术学院 | High-precision anti-interference fixed-point computer three-phase voltage frequency measurement phase-locking algorithm |
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