JPS5575364A - Ringing tone control unit - Google Patents

Ringing tone control unit

Info

Publication number
JPS5575364A
JPS5575364A JP14944778A JP14944778A JPS5575364A JP S5575364 A JPS5575364 A JP S5575364A JP 14944778 A JP14944778 A JP 14944778A JP 14944778 A JP14944778 A JP 14944778A JP S5575364 A JPS5575364 A JP S5575364A
Authority
JP
Japan
Prior art keywords
circuit
ringing tone
detector
level
output
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
JP14944778A
Other languages
Japanese (ja)
Inventor
Naoki Yamauchi
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.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric Corp
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 Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to JP14944778A priority Critical patent/JPS5575364A/en
Publication of JPS5575364A publication Critical patent/JPS5575364A/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
    • H04M19/04—Current supply arrangements for telephone systems providing ringing current or supervisory tones, e.g. dialling tone or busy tone the ringing-current being generated at the substations

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)

Abstract

PURPOSE:To ensure the sound wave generation in accordance with the circumferential situation by using both the ambient noise level and the elapsed time as the control input and thus preventing the ringing tone from becoming the noise source, thus ensuring the effective generation of the ringing tone. CONSTITUTION:Detector 31 consists of the microphone which detects the ambient noise or the sound wave to convert them into the electric signals, and others. In addition to detector 31, control circuit 32 is provided to receive supply of the signal of start signal input line 1 which supplies the output signal of detector circuit 31 and the start signal of the device. Thus the output of circuit 32 is supplied to ringing tone driving circuit 2 to generate the ringing tone. Then the following circuits are installed to circuit 32: input circuit 323 connected to detector 31 and input line 1; central process circuit 321; memory circuit 322 connected to circuit 321; and output circuit 324 which controls driving circuit 2 respectively. The level of the output value and the elapsed time are varied at circuit 32 in accordance with the level of the ambient noise, and the control is given to circuit 2. And the level of the ringing tone sent from sound wave generator 3 is fitted to the circumferential situation.
JP14944778A 1978-12-01 1978-12-01 Ringing tone control unit Pending JPS5575364A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP14944778A JPS5575364A (en) 1978-12-01 1978-12-01 Ringing tone control unit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP14944778A JPS5575364A (en) 1978-12-01 1978-12-01 Ringing tone control unit

Publications (1)

Publication Number Publication Date
JPS5575364A true JPS5575364A (en) 1980-06-06

Family

ID=15475311

Family Applications (1)

Application Number Title Priority Date Filing Date
JP14944778A Pending JPS5575364A (en) 1978-12-01 1978-12-01 Ringing tone control unit

Country Status (1)

Country Link
JP (1) JPS5575364A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5925500U (en) * 1982-08-09 1984-02-17 株式会社東芝 Primary system equipment of nuclear power plant
JPS62173852U (en) * 1986-04-22 1987-11-05
EP0507482A2 (en) * 1991-04-04 1992-10-07 Nokia Mobile Phones Ltd. Telephone ring generator with automatic volume control according to the ambient noise level

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5925500U (en) * 1982-08-09 1984-02-17 株式会社東芝 Primary system equipment of nuclear power plant
JPS62173852U (en) * 1986-04-22 1987-11-05
EP0507482A2 (en) * 1991-04-04 1992-10-07 Nokia Mobile Phones Ltd. Telephone ring generator with automatic volume control according to the ambient noise level

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