JPS5689165A - Intermittent ringing tone generation system - Google Patents

Intermittent ringing tone generation system

Info

Publication number
JPS5689165A
JPS5689165A JP16551179A JP16551179A JPS5689165A JP S5689165 A JPS5689165 A JP S5689165A JP 16551179 A JP16551179 A JP 16551179A JP 16551179 A JP16551179 A JP 16551179A JP S5689165 A JPS5689165 A JP S5689165A
Authority
JP
Japan
Prior art keywords
output
ringing tone
intermittent
signal
outputs
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
JP16551179A
Other languages
Japanese (ja)
Inventor
Hiroyuki Takeya
Tadashi Murayama
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 JP16551179A priority Critical patent/JPS5689165A/en
Publication of JPS5689165A publication Critical patent/JPS5689165A/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 suppress click noise, by changing the intermittent part of the ringing tone stepwise by signals different in amplitude. CONSTITUTION:Decimal counter 13 outputs successively the PCM code, which is obtained by sampling sine waves from output terminals M01-M31 of memory device 11, to clocks. Memory device 41 outputs the PCM code, which is obtained by sampling sine waves having the half amplitude of the said sine waves, from terminals M02-M32. The output of intermittent ringing generator 18 is applied to waveform converter 42. Converter 42 outputs the signal from terminal E before and after output of the signal from terminal D. Consequently, the signal where the envelope of the ringing tone is changed in steps at the intermittent point is output to output terminals 19-22, and thus, click noise is suppressed sufficiently.
JP16551179A 1979-12-21 1979-12-21 Intermittent ringing tone generation system Pending JPS5689165A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP16551179A JPS5689165A (en) 1979-12-21 1979-12-21 Intermittent ringing tone generation system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP16551179A JPS5689165A (en) 1979-12-21 1979-12-21 Intermittent ringing tone generation system

Publications (1)

Publication Number Publication Date
JPS5689165A true JPS5689165A (en) 1981-07-20

Family

ID=15813775

Family Applications (1)

Application Number Title Priority Date Filing Date
JP16551179A Pending JPS5689165A (en) 1979-12-21 1979-12-21 Intermittent ringing tone generation system

Country Status (1)

Country Link
JP (1) JPS5689165A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4972466A (en) * 1988-03-04 1990-11-20 Northern Telecom Limited Digital composite tone alerting

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4972466A (en) * 1988-03-04 1990-11-20 Northern Telecom Limited Digital composite tone alerting

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