JPS5741059A - Frequency discriminating system - Google Patents
Frequency discriminating systemInfo
- Publication number
- JPS5741059A JPS5741059A JP55116315A JP11631580A JPS5741059A JP S5741059 A JPS5741059 A JP S5741059A JP 55116315 A JP55116315 A JP 55116315A JP 11631580 A JP11631580 A JP 11631580A JP S5741059 A JPS5741059 A JP S5741059A
- Authority
- JP
- Japan
- Prior art keywords
- logic
- time
- continued
- frequency
- reversed
- 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
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/10—Frequency-modulated carrier systems, i.e. using frequency-shift keying
- H04L27/14—Demodulator circuits; Receiver circuits
- H04L27/156—Demodulator circuits; Receiver circuits with demodulation using temporal properties of the received signal, e.g. detecting pulse width
- H04L27/1566—Demodulator circuits; Receiver circuits with demodulation using temporal properties of the received signal, e.g. detecting pulse width using synchronous sampling
Abstract
PURPOSE:To realize a frequency discriminating system by which the adjustment of inductance and a capacitor is not required, by monitoring whether logic ''1'' or ''0'' of an input signal is continued for a prescribed time, and it is reversed or not. CONSTITUTION:Frequency signals inputted to terminals J1, J2 are applied to a microprocessor MPU through a band pass filter part BPF, an amplifying part AMP and a limiter part LIM. The microprocessor consists of an RAM, an ROM and a CPU, detects logic at the reference point of an input signal, monitors whether the same logic is continued or not for each T1 and T2 time, when the logic is ''1'' and ''0'', also monitors whether the logic ''0'' and ''1'' after reversal are continued or not for each T2 and T1 time, when the logic has been reversed within each time of T1 and T2, and decides that frequency of an incoming signal is smaller than 1/ (T1+T2), when an output has been obtained in each monitoring operation.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP55116315A JPS5741059A (en) | 1980-08-23 | 1980-08-23 | Frequency discriminating system |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP55116315A JPS5741059A (en) | 1980-08-23 | 1980-08-23 | Frequency discriminating system |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5741059A true JPS5741059A (en) | 1982-03-06 |
Family
ID=14683948
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP55116315A Pending JPS5741059A (en) | 1980-08-23 | 1980-08-23 | Frequency discriminating system |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5741059A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1987001256A1 (en) * | 1985-08-16 | 1987-02-26 | Npd Major Núcleo De Pesquisa E Desenvolvimento | Telephone and demodulator |
JPS6424593A (en) * | 1987-07-20 | 1989-01-26 | Anritsu Corp | Data transmitter |
JPH02106742U (en) * | 1989-02-09 | 1990-08-24 |
-
1980
- 1980-08-23 JP JP55116315A patent/JPS5741059A/en active Pending
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1987001256A1 (en) * | 1985-08-16 | 1987-02-26 | Npd Major Núcleo De Pesquisa E Desenvolvimento | Telephone and demodulator |
JPS6424593A (en) * | 1987-07-20 | 1989-01-26 | Anritsu Corp | Data transmitter |
JPH0479199B2 (en) * | 1987-07-20 | 1992-12-15 | Anritsu Corp | |
JPH02106742U (en) * | 1989-02-09 | 1990-08-24 |
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