JPS55151839A - Automatic level control circuit for telephone - Google Patents

Automatic level control circuit for telephone

Info

Publication number
JPS55151839A
JPS55151839A JP5909979A JP5909979A JPS55151839A JP S55151839 A JPS55151839 A JP S55151839A JP 5909979 A JP5909979 A JP 5909979A JP 5909979 A JP5909979 A JP 5909979A JP S55151839 A JPS55151839 A JP S55151839A
Authority
JP
Japan
Prior art keywords
control
dial
level
circuit
control circuit
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.)
Granted
Application number
JP5909979A
Other languages
Japanese (ja)
Other versions
JPS5928307B2 (en
Inventor
Yutaka Nishino
Makoto Yoshitoshi
Yukio Akazawa
Kaneyuki Nishihara
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.)
Nippon Telegraph and Telephone Corp
Original Assignee
Nippon Telegraph and Telephone 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 Nippon Telegraph and Telephone Corp filed Critical Nippon Telegraph and Telephone Corp
Priority to JP5909979A priority Critical patent/JPS5928307B2/en
Publication of JPS55151839A publication Critical patent/JPS55151839A/en
Publication of JPS5928307B2 publication Critical patent/JPS5928307B2/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/26—Devices for calling a subscriber
    • H04M1/30—Devices which can set up and transmit only one digit at a time
    • H04M1/50—Devices which can set up and transmit only one digit at a time by generating or selecting currents of predetermined frequencies or combinations of frequencies

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Control Of Amplification And Gain Control (AREA)

Abstract

PURPOSE:To reduce the change of the dial DC level by giving the control to the bias state of the amplifying circuit forming the output circuit of the dial generator and thus controlling the DC power consumption of the amplifying circuit, thus preventing the malfunction of the exchange. CONSTITUTION:Control part 5 of the automatic level control circuit detects the current supplied from the station, and then generates the binary signal. Controlled part 6 receive the control signal from part 5 through control signal line 8. And in case the control is given to the AC level of the dial signal, the control is also given concurrently to the bias state of amplifying circuit 3 forming the output circuit of dial generator 2. Thus the DC power consumption is controlled for circuit 3 to eliminate the change of the dial DC level. As a result, the malfunction can be avoided for the exchange.
JP5909979A 1979-05-16 1979-05-16 Dial signal automatic level adjustment circuit for telephones Expired JPS5928307B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP5909979A JPS5928307B2 (en) 1979-05-16 1979-05-16 Dial signal automatic level adjustment circuit for telephones

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP5909979A JPS5928307B2 (en) 1979-05-16 1979-05-16 Dial signal automatic level adjustment circuit for telephones

Publications (2)

Publication Number Publication Date
JPS55151839A true JPS55151839A (en) 1980-11-26
JPS5928307B2 JPS5928307B2 (en) 1984-07-12

Family

ID=13103539

Family Applications (1)

Application Number Title Priority Date Filing Date
JP5909979A Expired JPS5928307B2 (en) 1979-05-16 1979-05-16 Dial signal automatic level adjustment circuit for telephones

Country Status (1)

Country Link
JP (1) JPS5928307B2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59500344A (en) * 1982-03-04 1984-03-01 エステイーシー・ピーエルシー gain adjustment circuit

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59500344A (en) * 1982-03-04 1984-03-01 エステイーシー・ピーエルシー gain adjustment circuit

Also Published As

Publication number Publication date
JPS5928307B2 (en) 1984-07-12

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