JPS5697881A - Frequency measuring device - Google Patents
Frequency measuring deviceInfo
- Publication number
- JPS5697881A JPS5697881A JP40680A JP40680A JPS5697881A JP S5697881 A JPS5697881 A JP S5697881A JP 40680 A JP40680 A JP 40680A JP 40680 A JP40680 A JP 40680A JP S5697881 A JPS5697881 A JP S5697881A
- Authority
- JP
- Japan
- Prior art keywords
- frequency
- local oscillation
- higher harmonic
- found
- input signal
- 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
Landscapes
- Measuring Frequencies, Analyzing Spectra (AREA)
Abstract
PURPOSE: To take accurate measurement even if an input frequency varies, by measuring an intermediate frequency and local oscillation frequency at least three times at intervals of time, and by determining a higher harmonic degree by obtaining a mean value of two different combinations.
CONSTITUTION: An input signal frequency is measured by control means 25 at least three times simultaneously at intervals of time through intermediate frequency measuring means 17 and local oscillation frequency measuring means 18. As for two different combinations of those three measurements or more, higher harmonic degrees (n) are found from two intermediate frequencies Fi1 and Fi2, and local oscillation frequencies Fl1 and Fl2 by using expression I. From those arithmetic results, higher harmonic degree N is found and from this N, local oscillation frequency Fl and corresponding intermediate frequency Fi, the frequency of the input signal is found by arithmetic circuit 29. In this constitution, since the higher harmonic degree is determined by averaging the arithmetic results, accurate measurements can be taken even if the frequency of the input signal varies.
COPYRIGHT: (C)1981,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP40680A JPS5849828B2 (en) | 1980-01-07 | 1980-01-07 | frequency measurement device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP40680A JPS5849828B2 (en) | 1980-01-07 | 1980-01-07 | frequency measurement device |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS5697881A true JPS5697881A (en) | 1981-08-06 |
JPS5849828B2 JPS5849828B2 (en) | 1983-11-07 |
Family
ID=11472911
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP40680A Expired JPS5849828B2 (en) | 1980-01-07 | 1980-01-07 | frequency measurement device |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5849828B2 (en) |
-
1980
- 1980-01-07 JP JP40680A patent/JPS5849828B2/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
JPS5849828B2 (en) | 1983-11-07 |
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