JPS5741068A - Call signal generator - Google Patents

Call signal generator

Info

Publication number
JPS5741068A
JPS5741068A JP11736080A JP11736080A JPS5741068A JP S5741068 A JPS5741068 A JP S5741068A JP 11736080 A JP11736080 A JP 11736080A JP 11736080 A JP11736080 A JP 11736080A JP S5741068 A JPS5741068 A JP S5741068A
Authority
JP
Japan
Prior art keywords
switch group
digital pattern
various
digital
call signal
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
JP11736080A
Other languages
Japanese (ja)
Inventor
Susumu Iwasaki
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.)
NEC Corp
Original Assignee
NEC Corp
Nippon 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 NEC Corp, Nippon Electric Co Ltd filed Critical NEC Corp
Priority to JP11736080A priority Critical patent/JPS5741068A/en
Publication of JPS5741068A publication Critical patent/JPS5741068A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M19/00—Current supply arrangements for telephone systems
    • H04M19/02—Current supply arrangements for telephone systems providing ringing current or supervisory tones, e.g. dialling tone or busy tone

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Devices For Supply Of Signal Current (AREA)

Abstract

PURPOSE:To generate call signals which have been combined optionally, by 1 set of hardware, by providing a digital code sequence generator. CONSTITUTION:A digital code sequence generating circuit 1 is constituted of a microprocessor 2 and a switch group 3, and the microprocessor 2 generates a digital pattern sequence designated by the switch group 3. This digital pattern sequence is analogized through a D/A converter 4, its distortion component is removed by a low-pass filter 5, and it is sent out as a prescribed call signal by an amplifying and boosting means 6. Accordingly, various low frequency signals based on the digital pattern sequence are formed, by which various call signals are generated. Also, various digital pattern sequences are generated by a set data of the switch group 3.
JP11736080A 1980-08-26 1980-08-26 Call signal generator Pending JPS5741068A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP11736080A JPS5741068A (en) 1980-08-26 1980-08-26 Call signal generator

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP11736080A JPS5741068A (en) 1980-08-26 1980-08-26 Call signal generator

Publications (1)

Publication Number Publication Date
JPS5741068A true JPS5741068A (en) 1982-03-06

Family

ID=14709746

Family Applications (1)

Application Number Title Priority Date Filing Date
JP11736080A Pending JPS5741068A (en) 1980-08-26 1980-08-26 Call signal generator

Country Status (1)

Country Link
JP (1) JPS5741068A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58168364A (en) * 1982-03-29 1983-10-04 Fujitsu Ltd Ringing system
FR2535558A1 (en) * 1982-10-27 1984-05-04 Trt Telecom Radio Electr RINGER SIGNAL GENERATOR
US4631361A (en) * 1984-06-28 1986-12-23 Itt Corporation Programmable ring generator
US5442698A (en) * 1991-06-21 1995-08-15 Adc Telecommunications, Inc. Ringing generator for telephones
JP2003333179A (en) * 2002-05-17 2003-11-21 Oki Electric Ind Co Ltd Ring signal generating apparatus

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58168364A (en) * 1982-03-29 1983-10-04 Fujitsu Ltd Ringing system
FR2535558A1 (en) * 1982-10-27 1984-05-04 Trt Telecom Radio Electr RINGER SIGNAL GENERATOR
JPS5999856A (en) * 1982-10-27 1984-06-08 テレコミユニカシオン・ラジオエレクトリツク・エ・テレホニク・テ・ア−ル・テ Ringing signal generator
US4584576A (en) * 1982-10-27 1986-04-22 Telecommunications Radioelectriques Et Telephoniques T.R.T. Ringing signal generator
US4631361A (en) * 1984-06-28 1986-12-23 Itt Corporation Programmable ring generator
US5442698A (en) * 1991-06-21 1995-08-15 Adc Telecommunications, Inc. Ringing generator for telephones
JP2003333179A (en) * 2002-05-17 2003-11-21 Oki Electric Ind Co Ltd Ring signal generating apparatus

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