JPS5491108A - Multi-frequency signal detection system - Google Patents

Multi-frequency signal detection system

Info

Publication number
JPS5491108A
JPS5491108A JP15875777A JP15875777A JPS5491108A JP S5491108 A JPS5491108 A JP S5491108A JP 15875777 A JP15875777 A JP 15875777A JP 15875777 A JP15875777 A JP 15875777A JP S5491108 A JPS5491108 A JP S5491108A
Authority
JP
Japan
Prior art keywords
circuit
signal
output
input
frequency
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
JP15875777A
Other languages
Japanese (ja)
Other versions
JPS5828995B2 (en
Inventor
Atsushi Aiiso
Yujiro Sasahara
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.)
Fujitsu Ltd
Original Assignee
Fujitsu 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 Fujitsu Ltd filed Critical Fujitsu Ltd
Priority to JP52158757A priority Critical patent/JPS5828995B2/en
Publication of JPS5491108A publication Critical patent/JPS5491108A/en
Publication of JPS5828995B2 publication Critical patent/JPS5828995B2/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
    • H04Q1/45—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using multi-frequency signalling
    • H04Q1/453—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using multi-frequency signalling in which m-out-of-n signalling frequencies are transmitted

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)

Abstract

PURPOSE:To output a multi-fequency signal input as a pulse train from a holding circuit by resetting automatically the holding circuit, which the multi-frequency signal input at every frequency, each time it operates. CONSTITUTION:A multi-frequency input signal is caused to pass through low-pass filters 21 to 26 from input end 1, and a pertinent frequency signal is detected by signal detector circuits 31 to 36 and is inputted to FF 51 to 56 to be operated. Then, the output is taken out from output ends 61 to 66; and simultaneously, after each output of six frequencies is delayed by a fixed time in timing circuit 12 through OR circuit 11, FF 51 to 56 are rset according to control signal 14 which gives an input signal gate in AND circuit 13. Logic of OR circuit 11 is not operated by resetting FF 51 to 56, and timing circuit 12 is reset to return FF 51 to 56 to an initial state. This operation is repeated to take out a pulse train from output ends 61 to 66.
JP52158757A 1977-12-28 1977-12-28 Multi-frequency signal detection method Expired JPS5828995B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP52158757A JPS5828995B2 (en) 1977-12-28 1977-12-28 Multi-frequency signal detection method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP52158757A JPS5828995B2 (en) 1977-12-28 1977-12-28 Multi-frequency signal detection method

Publications (2)

Publication Number Publication Date
JPS5491108A true JPS5491108A (en) 1979-07-19
JPS5828995B2 JPS5828995B2 (en) 1983-06-20

Family

ID=15678668

Family Applications (1)

Application Number Title Priority Date Filing Date
JP52158757A Expired JPS5828995B2 (en) 1977-12-28 1977-12-28 Multi-frequency signal detection method

Country Status (1)

Country Link
JP (1) JPS5828995B2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113050025A (en) * 2021-02-02 2021-06-29 中国电子科技集团公司第二十九研究所 Method for improving direction-finding precision of millimeter wave signals without frequency information based on partition direction-finding

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5234608A (en) * 1975-08-01 1977-03-16 Nec Corp Multifrequency signal receiving system

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5234608A (en) * 1975-08-01 1977-03-16 Nec Corp Multifrequency signal receiving system

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113050025A (en) * 2021-02-02 2021-06-29 中国电子科技集团公司第二十九研究所 Method for improving direction-finding precision of millimeter wave signals without frequency information based on partition direction-finding
CN113050025B (en) * 2021-02-02 2022-07-15 中国电子科技集团公司第二十九研究所 Method for improving direction-finding precision of millimeter wave signals without frequency information based on partition direction finding

Also Published As

Publication number Publication date
JPS5828995B2 (en) 1983-06-20

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