JPS5567287A - Signal receiver - Google Patents

Signal receiver

Info

Publication number
JPS5567287A
JPS5567287A JP13987578A JP13987578A JPS5567287A JP S5567287 A JPS5567287 A JP S5567287A JP 13987578 A JP13987578 A JP 13987578A JP 13987578 A JP13987578 A JP 13987578A JP S5567287 A JPS5567287 A JP S5567287A
Authority
JP
Japan
Prior art keywords
circuits
duty
wave
limiter
outputs
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
JP13987578A
Other languages
Japanese (ja)
Other versions
JPS5944837B2 (en
Inventor
Katsumasa Ono
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.)
Hitachi Ltd
Original Assignee
Hitachi 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 Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP13987578A priority Critical patent/JPS5944837B2/en
Publication of JPS5567287A publication Critical patent/JPS5567287A/en
Publication of JPS5944837B2 publication Critical patent/JPS5944837B2/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
    • H04Q1/457—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using multi-frequency signalling with conversion of multifrequency signals into digital signals

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)

Abstract

PURPOSE:To prevent the influence dependent upon echo and obtain a square wave of duty 50% by operating AND between a signal obtained by converting an input signal to the aquare wave of duty 50% and a signal obtained by rectifying the output signa of a limiter circuit. CONSTITUTION:Multi-frequency signals applied to input terminal IN are applied to limiter circuits 15 and 15' where a square wave of duty 50% is obtained, after separated into one high-group frequency and one low-group frequency. Meanwhile, the maximum value of one-wave components of the input signal detected by maximum value detection circuits 3 and 3' is inputted to variable threshold circuits 4 and 4', and outputs of variable threshold circuits 4 and 4' are compared with the output of branching filter 1 by limiter circuits 2 and 2', and outputs are applied to rectifier circuits 14 and 14'. AND between outputs of circuits 14 and 14' and limiter circuits 15 and 15' is operated by AND circuits 16 and 16', and square-wave pulses of duty 50% are outputted and applied to band-pass filter circuit 5.
JP13987578A 1978-11-15 1978-11-15 signal receiver Expired JPS5944837B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP13987578A JPS5944837B2 (en) 1978-11-15 1978-11-15 signal receiver

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP13987578A JPS5944837B2 (en) 1978-11-15 1978-11-15 signal receiver

Publications (2)

Publication Number Publication Date
JPS5567287A true JPS5567287A (en) 1980-05-21
JPS5944837B2 JPS5944837B2 (en) 1984-11-01

Family

ID=15255591

Family Applications (1)

Application Number Title Priority Date Filing Date
JP13987578A Expired JPS5944837B2 (en) 1978-11-15 1978-11-15 signal receiver

Country Status (1)

Country Link
JP (1) JPS5944837B2 (en)

Also Published As

Publication number Publication date
JPS5944837B2 (en) 1984-11-01

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