JPS5291306A - Multi-frequency signal receiving system - Google Patents

Multi-frequency signal receiving system

Info

Publication number
JPS5291306A
JPS5291306A JP771676A JP771676A JPS5291306A JP S5291306 A JPS5291306 A JP S5291306A JP 771676 A JP771676 A JP 771676A JP 771676 A JP771676 A JP 771676A JP S5291306 A JPS5291306 A JP S5291306A
Authority
JP
Japan
Prior art keywords
frequency signal
signal receiving
receiving system
circuits
rectification
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
JP771676A
Other languages
Japanese (ja)
Inventor
Koichi Hasegawa
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.)
NEC Corp
Original Assignee
NEC Corp
Nippon Electric 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 NEC Corp, Nippon Electric Co Ltd filed Critical NEC Corp
Priority to JP771676A priority Critical patent/JPS5291306A/en
Publication of JPS5291306A publication Critical patent/JPS5291306A/en
Pending 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 simplify the construction and improve the performance of a circuit by providing rectification circuits between tuning circuits and detection circuits thereby starting a timer circuit based on the maximum value calculation in the rectification circuits.
JP771676A 1976-01-26 1976-01-26 Multi-frequency signal receiving system Pending JPS5291306A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP771676A JPS5291306A (en) 1976-01-26 1976-01-26 Multi-frequency signal receiving system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP771676A JPS5291306A (en) 1976-01-26 1976-01-26 Multi-frequency signal receiving system

Publications (1)

Publication Number Publication Date
JPS5291306A true JPS5291306A (en) 1977-08-01

Family

ID=11673451

Family Applications (1)

Application Number Title Priority Date Filing Date
JP771676A Pending JPS5291306A (en) 1976-01-26 1976-01-26 Multi-frequency signal receiving system

Country Status (1)

Country Link
JP (1) JPS5291306A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS54104212A (en) * 1978-02-02 1979-08-16 Fujitsu Ltd Receiver for multi-frequency signal
JPS59167130A (en) * 1983-03-14 1984-09-20 Nippon Telegr & Teleph Corp <Ntt> Wave dividing and synthesizing method for radio equipment

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS54104212A (en) * 1978-02-02 1979-08-16 Fujitsu Ltd Receiver for multi-frequency signal
JPS59167130A (en) * 1983-03-14 1984-09-20 Nippon Telegr & Teleph Corp <Ntt> Wave dividing and synthesizing method for radio equipment

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