JPS5754465A - Signal tone detection system - Google Patents

Signal tone detection system

Info

Publication number
JPS5754465A
JPS5754465A JP12991080A JP12991080A JPS5754465A JP S5754465 A JPS5754465 A JP S5754465A JP 12991080 A JP12991080 A JP 12991080A JP 12991080 A JP12991080 A JP 12991080A JP S5754465 A JPS5754465 A JP S5754465A
Authority
JP
Japan
Prior art keywords
output
tone
component
signal
suppressing
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
JP12991080A
Other languages
Japanese (ja)
Inventor
Toshiyuki Yamamoto
Yutaka Moriyama
Tatsuki Hayashi
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 JP12991080A priority Critical patent/JPS5754465A/en
Publication of JPS5754465A publication Critical patent/JPS5754465A/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
    • H04Q1/446—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)
  • Devices For Supply Of Signal Current (AREA)

Abstract

PURPOSE:To make discrimination for detection of audible signal tone, by half-wave rectifying the audible signal tone and providing a DC component suppressing circuit suppressing DC component of the output, in a digital terminal station device using an audio analysis and synthesis system. CONSTITUTION:A control signal makes initial set, and an output of an integrated binary circuit 6 is transmitted to AND circuits 7, 8 suppressing the DC component at high level. While the control signal is inintially set, the circuits 7, 8 are inhibited, and an output at output terminals 10, 11 for call tone and busy tone is at low level, allowing to avoid malfunction due to noise. When an audible signal tone comes and the control signal is initially set to be a high potential, the output of the circuit 6 is at high level, and the output at the terminal 10 is at high level when the call tone comes and the output at the terminal 11 is at a low level. Thus, an audible signal tone can be discriminated by the presence of signal components of an output signal of DC component suppressing circuit.
JP12991080A 1980-09-17 1980-09-17 Signal tone detection system Pending JPS5754465A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP12991080A JPS5754465A (en) 1980-09-17 1980-09-17 Signal tone detection system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP12991080A JPS5754465A (en) 1980-09-17 1980-09-17 Signal tone detection system

Publications (1)

Publication Number Publication Date
JPS5754465A true JPS5754465A (en) 1982-03-31

Family

ID=15021409

Family Applications (1)

Application Number Title Priority Date Filing Date
JP12991080A Pending JPS5754465A (en) 1980-09-17 1980-09-17 Signal tone detection system

Country Status (1)

Country Link
JP (1) JPS5754465A (en)

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