JPS5775092A - Dial signal detection system - Google Patents

Dial signal detection system

Info

Publication number
JPS5775092A
JPS5775092A JP15178180A JP15178180A JPS5775092A JP S5775092 A JPS5775092 A JP S5775092A JP 15178180 A JP15178180 A JP 15178180A JP 15178180 A JP15178180 A JP 15178180A JP S5775092 A JPS5775092 A JP S5775092A
Authority
JP
Japan
Prior art keywords
circuit
signal
pattern
comparison discrimination
digitized
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
JP15178180A
Other languages
Japanese (ja)
Inventor
Shigeki Tanaka
Shinichi Miwa
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 JP15178180A priority Critical patent/JPS5775092A/en
Publication of JPS5775092A publication Critical patent/JPS5775092A/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
    • H04Q1/457—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 reduce the circuit scale without providing a filter circuit to integrate the circuit, by providing a pattern generating circuit to detect directly a digitized PB (push button) signal. CONSTITUTION:The PB signal transmitted by a digital signal transmission line has the waveform shaped by a receiving circuit 21 and is applied to a frequency discriminating circuit 22. The frequency discriminated circuit 22 has a shift register 24, a pattern generation circuit 25, and a comparison discrimination circuit 26. The pattern generation circuit 25 generates pulse patterns, which are due to digitizing of the PB signal and whose number corresponds to the number of combinations of two frequencies, and inputs them to the comparison discrimination circuit 26. The comparison discrimination circuit 26 compares the digitized PB signal of the output of the shift register 24 with plural pulse patterns, and an output corresponding to a coincident pattern is applied to a pulse cold generation circuit 23. Thus, the PB signal is detected with a simple constitution without demodulating it to an analogue signal.
JP15178180A 1980-10-29 1980-10-29 Dial signal detection system Pending JPS5775092A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP15178180A JPS5775092A (en) 1980-10-29 1980-10-29 Dial signal detection system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP15178180A JPS5775092A (en) 1980-10-29 1980-10-29 Dial signal detection system

Publications (1)

Publication Number Publication Date
JPS5775092A true JPS5775092A (en) 1982-05-11

Family

ID=15526154

Family Applications (1)

Application Number Title Priority Date Filing Date
JP15178180A Pending JPS5775092A (en) 1980-10-29 1980-10-29 Dial signal detection system

Country Status (1)

Country Link
JP (1) JPS5775092A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0081294A3 (en) * 1981-11-06 1984-05-16 Electronics Corporation Of Israel Limited Tone detector

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS53110307A (en) * 1977-03-08 1978-09-27 Nec Corp Multi-frequency signal receiving system

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS53110307A (en) * 1977-03-08 1978-09-27 Nec Corp Multi-frequency signal receiving system

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0081294A3 (en) * 1981-11-06 1984-05-16 Electronics Corporation Of Israel Limited Tone detector

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