JPS5741059A - Frequency discriminating system - Google Patents

Frequency discriminating system

Info

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
Application number
JP55116315A
Other languages
Japanese (ja)
Inventor
Noboru Kanzaki
Kenji Etsuno
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Tamura Electric Works Ltd
Original Assignee
Tamura Electric Works Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Tamura Electric Works Ltd filed Critical Tamura Electric Works Ltd
Priority to JP55116315A priority Critical patent/JPS5741059A/en
Publication of JPS5741059A publication Critical patent/JPS5741059A/en
Pending legal-status Critical Current

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

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Dc Digital Transmission (AREA)
  • Selective Calling Equipment (AREA)
  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)

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.
JP55116315A 1980-08-23 1980-08-23 Frequency discriminating system Pending JPS5741059A (en)

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)

* Cited by examiner, † Cited by third party
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

Cited By (4)

* Cited by examiner, † Cited by third party
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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