JPS56110373A - Tone signal detector - Google Patents

Tone signal detector

Info

Publication number
JPS56110373A
JPS56110373A JP1313080A JP1313080A JPS56110373A JP S56110373 A JPS56110373 A JP S56110373A JP 1313080 A JP1313080 A JP 1313080A JP 1313080 A JP1313080 A JP 1313080A JP S56110373 A JPS56110373 A JP S56110373A
Authority
JP
Japan
Prior art keywords
frequency
tone signal
circuit
signal
measuring
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
JP1313080A
Other languages
Japanese (ja)
Other versions
JPH0253984B2 (en
Inventor
Shigeru Kimura
Tatsunori Kato
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.)
Nippon Telegraph and Telephone Corp
Panasonic Mobile Communications Co Ltd
Original Assignee
Nippon Telegraph and Telephone Corp
Matsushita Communication Industrial 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 Nippon Telegraph and Telephone Corp, Matsushita Communication Industrial Co Ltd filed Critical Nippon Telegraph and Telephone Corp
Priority to JP1313080A priority Critical patent/JPS56110373A/en
Publication of JPS56110373A publication Critical patent/JPS56110373A/en
Publication of JPH0253984B2 publication Critical patent/JPH0253984B2/ja
Granted 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
    • H04Q1/448—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using one signalling frequency with conversion of a single frequency signal into a digital signal

Landscapes

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

Abstract

PURPOSE:To detect a tone signal with high sensitivity even in the high noise level environment, by measuring many times the frequency of an input signal and then concluding a detection of the tone signal in case the frequency of the tone signal is concluded with a certain probability or more. CONSTITUTION:The gate control circuit 3 opens the gate 4 for 3 periods of the input signal and then applies the reference frequency given from the reference frequency generator circuit 5 to the period measuring circuit 6. The frequency deciding circuit 7 decides whether the input signal is the tone signal to be detected or not from the contents of the counter 6. The measuring frequency counter 8 counts the measuring frequencies for the period of the input signal. The frequency coincidence counter 9 counts the output of the circuit 7. The signal detection threshold level circuit 10 compares the contents of the counters 8 and 9 to decide the tone signal detection, and then produces the tone signal detection output signal from the terminal 11.
JP1313080A 1980-02-05 1980-02-05 Tone signal detector Granted JPS56110373A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1313080A JPS56110373A (en) 1980-02-05 1980-02-05 Tone signal detector

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1313080A JPS56110373A (en) 1980-02-05 1980-02-05 Tone signal detector

Publications (2)

Publication Number Publication Date
JPS56110373A true JPS56110373A (en) 1981-09-01
JPH0253984B2 JPH0253984B2 (en) 1990-11-20

Family

ID=11824566

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1313080A Granted JPS56110373A (en) 1980-02-05 1980-02-05 Tone signal detector

Country Status (1)

Country Link
JP (1) JPS56110373A (en)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS49129082A (en) * 1973-04-20 1974-12-10
JPS5450214A (en) * 1977-09-28 1979-04-20 Fujitsu Ltd Synchronizing system

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS49129082A (en) * 1973-04-20 1974-12-10
JPS5450214A (en) * 1977-09-28 1979-04-20 Fujitsu Ltd Synchronizing system

Also Published As

Publication number Publication date
JPH0253984B2 (en) 1990-11-20

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