JPS57211891A - Tone detector - Google Patents

Tone detector

Info

Publication number
JPS57211891A
JPS57211891A JP9662381A JP9662381A JPS57211891A JP S57211891 A JPS57211891 A JP S57211891A JP 9662381 A JP9662381 A JP 9662381A JP 9662381 A JP9662381 A JP 9662381A JP S57211891 A JPS57211891 A JP S57211891A
Authority
JP
Japan
Prior art keywords
signal
timing circuit
level
tone
output
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
JP9662381A
Other languages
English (en)
Inventor
Yasuo Miyazaki
Kunio Yamamoto
Yasutsugu Nagahama
Yusuke Ogata
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 JP9662381A priority Critical patent/JPS57211891A/ja
Publication of JPS57211891A publication Critical patent/JPS57211891A/ja
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)
  • Monitoring And Testing Of Exchanges (AREA)
JP9662381A 1981-06-24 1981-06-24 Tone detector Pending JPS57211891A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP9662381A JPS57211891A (en) 1981-06-24 1981-06-24 Tone detector

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP9662381A JPS57211891A (en) 1981-06-24 1981-06-24 Tone detector

Publications (1)

Publication Number Publication Date
JPS57211891A true JPS57211891A (en) 1982-12-25

Family

ID=14169963

Family Applications (1)

Application Number Title Priority Date Filing Date
JP9662381A Pending JPS57211891A (en) 1981-06-24 1981-06-24 Tone detector

Country Status (1)

Country Link
JP (1) JPS57211891A (ja)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63196146A (ja) * 1987-02-10 1988-08-15 Anritsu Corp 信号受信装置

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5522406B2 (ja) * 1972-11-24 1980-06-17

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5522406B2 (ja) * 1972-11-24 1980-06-17

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63196146A (ja) * 1987-02-10 1988-08-15 Anritsu Corp 信号受信装置

Similar Documents

Publication Publication Date Title
JPS53129079A (en) Spectrum change monitoring system
JPS5574467A (en) Method of eliminating noise from known frequency
JPS5761327A (en) Periodicity pulse extraction circuit
JPS57211891A (en) Tone detector
JPS5737907A (en) Fm wave detector
JPS56135128A (en) Knocking oscillation detection device
JPS5430727A (en) Noise eliminator circuit of synchronous separator circuit
JPS5764127A (en) Loose parts monitor
JPS5232655A (en) Logic low-pass filter circuit
JPS6460063A (en) Noise reducer
JPS6460064A (en) Noise reducer
JPS56115024A (en) Automatic threshold level setting circuit
JPS56143960A (en) Noise detector
JPS6430071A (en) Reproducing circuit for digital optical disk
JPS5740711A (en) Audio signal reproducing device equipped with noise eliminating circuit
JPS5558455A (en) Analogue output device for ultrasonic flaw detection
JPS57186811A (en) Amplifier
JPS53117925A (en) Frequency control circuit
JPS5434669A (en) Frequency discriminator
JPS6460066A (en) Noise reduction device
JPS5444860A (en) Waveform shaping circuit
JPS5510214A (en) Channel counter circuit
JPS5487110A (en) Detection circuit for television synchronizing signal
JPS57150288A (en) Drop-out detecting device
JPS5636204A (en) Noise erasing unit