JPS55141853A - Frequency detecting system - Google Patents

Frequency detecting system

Info

Publication number
JPS55141853A
JPS55141853A JP4973379A JP4973379A JPS55141853A JP S55141853 A JPS55141853 A JP S55141853A JP 4973379 A JP4973379 A JP 4973379A JP 4973379 A JP4973379 A JP 4973379A JP S55141853 A JPS55141853 A JP S55141853A
Authority
JP
Japan
Prior art keywords
integration
output
circuit
pair
multiplication
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.)
Granted
Application number
JP4973379A
Other languages
Japanese (ja)
Other versions
JPS5846102B2 (en
Inventor
Yoshikazu Ikeda
Masamitsu Norikoshi
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.)
KDDI Corp
Original Assignee
Kokusai Denshin Denwa KK
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 Kokusai Denshin Denwa KK filed Critical Kokusai Denshin Denwa KK
Priority to JP54049733A priority Critical patent/JPS5846102B2/en
Publication of JPS55141853A publication Critical patent/JPS55141853A/en
Publication of JPS5846102B2 publication Critical patent/JPS5846102B2/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q1/00—Details of selecting apparatus or arrangements
    • H04Q1/18—Electrical details
    • H04Q1/30—Signalling arrangements; Manipulation of signalling currents
    • H04Q1/44—Signalling arrangements; Manipulation of signalling currents using alternate current
    • H04Q1/444—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies
    • H04Q1/446—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using one signalling frequency

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Measuring Frequencies, Analyzing Spectra (AREA)
  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)

Abstract

PURPOSE:To perform final frequency detection with the combination of the result obtained each integration, by providing a plurality of start phases at integration section and executing the Fourier integration through overlapped phases while shifting time. CONSTITUTION:The input signal x(t) is multipled by each waveform of the cosine wave oscillator 43a and sine wave oscillator 43b at the multiplication circuits 42a, 42b. The pair (44a1, 44b1) of the first integration circuit integrates the output of the multiplication circuit 42a for a given time T, and the integration is repeated one after another. On the other hand, the pair (44a2, 44b2) of the second integration circuit starts the integration from the time at the center of the integration section of the first pair, integrates the output of the multiplication circuit 42b for a given time T and this is repeated after that. The result of integration of each is output at the final integration section, fed to the square circuits 45a, 45b at the next stage, squeared and the input of the same timing is added at the addition circuit 46. The output of addition is compared with the specified value at the discrimination circuit 47 to transmit the output.
JP54049733A 1979-04-24 1979-04-24 Frequency detection method Expired JPS5846102B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP54049733A JPS5846102B2 (en) 1979-04-24 1979-04-24 Frequency detection method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP54049733A JPS5846102B2 (en) 1979-04-24 1979-04-24 Frequency detection method

Publications (2)

Publication Number Publication Date
JPS55141853A true JPS55141853A (en) 1980-11-06
JPS5846102B2 JPS5846102B2 (en) 1983-10-14

Family

ID=12839383

Family Applications (1)

Application Number Title Priority Date Filing Date
JP54049733A Expired JPS5846102B2 (en) 1979-04-24 1979-04-24 Frequency detection method

Country Status (1)

Country Link
JP (1) JPS5846102B2 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6277746A (en) * 1985-10-01 1987-04-09 Oki Electric Ind Co Ltd Ring trip system
US6731745B1 (en) 1999-05-10 2004-05-04 Mitsubishi Denki Kabushiki Kaisha Frequency deviation detecting apparatus and frequency deviation detecting method
US7227943B2 (en) 2001-12-06 2007-06-05 Ricoh Company, Ltd. Tone detector
WO2019225014A1 (en) * 2018-05-25 2019-11-28 株式会社東陽テクニカ Spectrum analysis method and device therefor

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6277746A (en) * 1985-10-01 1987-04-09 Oki Electric Ind Co Ltd Ring trip system
US6731745B1 (en) 1999-05-10 2004-05-04 Mitsubishi Denki Kabushiki Kaisha Frequency deviation detecting apparatus and frequency deviation detecting method
US7227943B2 (en) 2001-12-06 2007-06-05 Ricoh Company, Ltd. Tone detector
WO2019225014A1 (en) * 2018-05-25 2019-11-28 株式会社東陽テクニカ Spectrum analysis method and device therefor
US11268857B2 (en) 2018-05-25 2022-03-08 Toyo Corporation Spectrum analysis method and spectrum analysis apparatus

Also Published As

Publication number Publication date
JPS5846102B2 (en) 1983-10-14

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