JPS5735764A - Fundamental frequency measuring device - Google Patents
Fundamental frequency measuring deviceInfo
- Publication number
- JPS5735764A JPS5735764A JP11070680A JP11070680A JPS5735764A JP S5735764 A JPS5735764 A JP S5735764A JP 11070680 A JP11070680 A JP 11070680A JP 11070680 A JP11070680 A JP 11070680A JP S5735764 A JPS5735764 A JP S5735764A
- Authority
- JP
- Japan
- Prior art keywords
- adds
- arithmetic device
- fourier coefficient
- fourier
- fundamental frequency
- 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
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R23/00—Arrangements for measuring frequencies; Arrangements for analysing frequency spectra
- G01R23/02—Arrangements for measuring frequency, e.g. pulse repetition rate; Arrangements for measuring period of current or voltage
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Measuring Frequencies, Analyzing Spectra (AREA)
Abstract
PURPOSE:To measure fundamental frequency at high accuracy even when a signal to be measured containes noise of high order by high speed Fourier transforming the input signal and finding out frequency that makes ampliture maximum by this Fourier coefficient. CONSTITUTION:An A/D converter 10 converts a signal to be measured inputted in a measuring time T into a digital signal and adds to a storage device 11, and a high speed Fourier transformer 12 calculates the Fourier coefficient and adds to a storage device 13. An arithmetic device 14 calculates the sum of square of the Fourier coefficient and adds to a storage device 15. A comparison arithmetic device 16 detects the degree (n) that makes am<2>+bm<2> maximum and adds it to an arithmetic device 17. On the other hand, a correction arithmetic device 18 to which Fourier coefficient of (m), (n) degree is added by the high speed Fourier transformer 12 determines the ratio of Fourier coefficient and finds out an error DELTAn. Then, the arithmetic device 17 adds (n) and DELTAn and displays the fundamental frequency on a display device 19. By this way, correct measurement can be effected without influenced by noise.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11070680A JPS5735764A (en) | 1980-08-12 | 1980-08-12 | Fundamental frequency measuring device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11070680A JPS5735764A (en) | 1980-08-12 | 1980-08-12 | Fundamental frequency measuring device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS5735764A true JPS5735764A (en) | 1982-02-26 |
Family
ID=14542387
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11070680A Pending JPS5735764A (en) | 1980-08-12 | 1980-08-12 | Fundamental frequency measuring device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5735764A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63183719U (en) * | 1987-05-18 | 1988-11-25 | ||
| JPH03240317A (en) * | 1990-02-19 | 1991-10-25 | Alps Electric Co Ltd | Digital pll circuit |
| CN103048539A (en) * | 2012-12-28 | 2013-04-17 | 南京工程学院 | Accurate acquisition device and method of power frequency in audio forensics |
-
1980
- 1980-08-12 JP JP11070680A patent/JPS5735764A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63183719U (en) * | 1987-05-18 | 1988-11-25 | ||
| JPH03240317A (en) * | 1990-02-19 | 1991-10-25 | Alps Electric Co Ltd | Digital pll circuit |
| CN103048539A (en) * | 2012-12-28 | 2013-04-17 | 南京工程学院 | Accurate acquisition device and method of power frequency in audio forensics |
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