JPS5347702A - Tone detector - Google Patents

Tone detector

Info

Publication number
JPS5347702A
JPS5347702A JP12241876A JP12241876A JPS5347702A JP S5347702 A JPS5347702 A JP S5347702A JP 12241876 A JP12241876 A JP 12241876A JP 12241876 A JP12241876 A JP 12241876A JP S5347702 A JPS5347702 A JP S5347702A
Authority
JP
Japan
Prior art keywords
tone detector
frequency
hpf
lpf
shorten
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
JP12241876A
Other languages
Japanese (ja)
Inventor
Tsuneaki Oka
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.)
Toshiba Corp
Original Assignee
Toshiba Corp
Tokyo Shibaura 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 Toshiba Corp, Tokyo Shibaura Electric Co Ltd filed Critical Toshiba Corp
Priority to JP12241876A priority Critical patent/JPS5347702A/en
Publication of JPS5347702A publication Critical patent/JPS5347702A/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)
  • Mobile Radio Communication Systems (AREA)

Abstract

PURPOSE:To shorten the response time at the detection time of the multi-frequency tone signal and to obtain a high-speed operation, by using HPF and LPF of different cut-off frequency and giving a logical computation to the output.
JP12241876A 1976-10-13 1976-10-13 Tone detector Pending JPS5347702A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP12241876A JPS5347702A (en) 1976-10-13 1976-10-13 Tone detector

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP12241876A JPS5347702A (en) 1976-10-13 1976-10-13 Tone detector

Publications (1)

Publication Number Publication Date
JPS5347702A true JPS5347702A (en) 1978-04-28

Family

ID=14835324

Family Applications (1)

Application Number Title Priority Date Filing Date
JP12241876A Pending JPS5347702A (en) 1976-10-13 1976-10-13 Tone detector

Country Status (1)

Country Link
JP (1) JPS5347702A (en)

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