JPS5596753A - Digital multi-frequency receiving system - Google Patents
Digital multi-frequency receiving systemInfo
- Publication number
- JPS5596753A JPS5596753A JP334379A JP334379A JPS5596753A JP S5596753 A JPS5596753 A JP S5596753A JP 334379 A JP334379 A JP 334379A JP 334379 A JP334379 A JP 334379A JP S5596753 A JPS5596753 A JP S5596753A
- Authority
- JP
- Japan
- Prior art keywords
- power
- filter
- calculators
- decision
- linear pcm
- 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 Transmission Methods That Use Modulated Carrier Waves (AREA)
Abstract
PURPOSE: To simplify a circuit constitution considerably by measuring the power ratio before and after a cam filter for decision to decide whether a specific frequency exists or not.
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 spectrum inverter INV and low-pass filter LPF. Then, cam filters CF1 and CF2, filters CF1a and CF2a for decision, and power calculators P1∼P4 are provided, and calculators P1 and P2 measure power Pt1 before input of filter CF2a and power Pt2 after output of it respectively. Similarly, calculators P3 and P4 measure power Pt3 before input of filter CF1a and power Pt4 after output of it respectively. Then, it is decided with powers Pt1∼Pt4 and number ZCt1 of zero crossing as data by decision equipment DC1 whether tone signals exist or not.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP334379A JPS5596753A (en) | 1979-01-18 | 1979-01-18 | Digital multi-frequency receiving system |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP334379A JPS5596753A (en) | 1979-01-18 | 1979-01-18 | Digital multi-frequency receiving system |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5596753A true JPS5596753A (en) | 1980-07-23 |
Family
ID=11554704
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP334379A Pending JPS5596753A (en) | 1979-01-18 | 1979-01-18 | Digital multi-frequency receiving system |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5596753A (en) |
-
1979
- 1979-01-18 JP JP334379A patent/JPS5596753A/en active Pending
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