JPS5596754A - Digital frequency detection system - Google Patents
Digital frequency detection systemInfo
- Publication number
- JPS5596754A JPS5596754A JP334479A JP334479A JPS5596754A JP S5596754 A JPS5596754 A JP S5596754A JP 334479 A JP334479 A JP 334479A JP 334479 A JP334479 A JP 334479A JP S5596754 A JPS5596754 A JP S5596754A
- Authority
- JP
- Japan
- Prior art keywords
- filter
- power
- linear pcm
- cam
- 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
Abstract
PURPOSE: To decide whether a tone signal exists or not by causing a digitized signal to pass through a cam filter including a specific frequency or a frequency, which is obtained by converting this specific frequency, at the zero point and by measuring the power ratio before and after the cam filter.
CONSTITUTION: Non-linear PCM signals and linear PCM signals are inputted from terminal 3 and terminal 3a respectively, and the former is converted to a linear PCM signal by expander EXP. Expander EXP is connected to frequency shifter FSH, high-pass filter HPF and cam filter CF1. Power calculator P1 measures power Pt1 before input of cam filter CF1, and power calculator P2 measures power Pt2 after output of filter CF1. Then, it is decided by decision equipment DC1 whether the tone signal exists or not.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP334479A JPS5596754A (en) | 1979-01-18 | 1979-01-18 | Digital frequency detection system |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP334479A JPS5596754A (en) | 1979-01-18 | 1979-01-18 | Digital frequency detection system |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5596754A true JPS5596754A (en) | 1980-07-23 |
Family
ID=11554732
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP334479A Pending JPS5596754A (en) | 1979-01-18 | 1979-01-18 | Digital frequency detection system |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5596754A (en) |
-
1979
- 1979-01-18 JP JP334479A patent/JPS5596754A/en active Pending
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