JPS5589759A - Frequency detector - Google Patents

Frequency detector

Info

Publication number
JPS5589759A
JPS5589759A JP16340078A JP16340078A JPS5589759A JP S5589759 A JPS5589759 A JP S5589759A JP 16340078 A JP16340078 A JP 16340078A JP 16340078 A JP16340078 A JP 16340078A JP S5589759 A JPS5589759 A JP S5589759A
Authority
JP
Japan
Prior art keywords
circuit
signal
frequency
time
sweep
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
JP16340078A
Other languages
Japanese (ja)
Inventor
Yoshito Desaki
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.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial Co 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 Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Priority to JP16340078A priority Critical patent/JPS5589759A/en
Publication of JPS5589759A publication Critical patent/JPS5589759A/en
Pending legal-status Critical Current

Links

Landscapes

  • Measuring Frequencies, Analyzing Spectra (AREA)

Abstract

PURPOSE: To enable to detect a plurality of frequencies in a short time and to reduce the cost, by providing the input circuit, trigger signal generating circuit, sweep generator, threshold circuit and time difference detection circuit.
CONSTITUTION: The control signal unknown in the frequency is inputted to the input terminal 1, and the trigger signal from the input terminal 4 is produced at the reception side so that it has the time distance in matching with minimum continuous time width among a plurality of control signal incoming. The sweep oscilator 3 performs sweep by taking synchronism with the trigger signal to continuously change the frequency. The output of the sweep oscillator 3 is modulated with the incoming signal at the modulator 2 and the beat signal being the difference frequency is outputted. The output signal of the modulator 2 is rectified at the rectifying circuit 5 and inputted to the threshold circuit 7 via LPF6. The output of the circuit 7 is fed to the time difference detection circuit. The time diference from the trigger signal indicates the frequency of incoming signal. Accordingly, a number of frequencies can be detected in a short time without using many filters.
COPYRIGHT: (C)1980,JPO&Japio
JP16340078A 1978-12-27 1978-12-27 Frequency detector Pending JPS5589759A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP16340078A JPS5589759A (en) 1978-12-27 1978-12-27 Frequency detector

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP16340078A JPS5589759A (en) 1978-12-27 1978-12-27 Frequency detector

Publications (1)

Publication Number Publication Date
JPS5589759A true JPS5589759A (en) 1980-07-07

Family

ID=15773166

Family Applications (1)

Application Number Title Priority Date Filing Date
JP16340078A Pending JPS5589759A (en) 1978-12-27 1978-12-27 Frequency detector

Country Status (1)

Country Link
JP (1) JPS5589759A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003075497A (en) * 2001-09-03 2003-03-12 Hioki Ee Corp Cable-inspecting apparatus

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003075497A (en) * 2001-09-03 2003-03-12 Hioki Ee Corp Cable-inspecting apparatus

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