JPS6422154A - Call signal circuit - Google Patents

Call signal circuit

Info

Publication number
JPS6422154A
JPS6422154A JP17839587A JP17839587A JPS6422154A JP S6422154 A JPS6422154 A JP S6422154A JP 17839587 A JP17839587 A JP 17839587A JP 17839587 A JP17839587 A JP 17839587A JP S6422154 A JPS6422154 A JP S6422154A
Authority
JP
Japan
Prior art keywords
call signal
signal
zero cross
current
voltage
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
JP17839587A
Other languages
Japanese (ja)
Other versions
JP2618900B2 (en
Inventor
Tsuneo Suzuki
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
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 filed Critical Toshiba Corp
Priority to JP17839587A priority Critical patent/JP2618900B2/en
Publication of JPS6422154A publication Critical patent/JPS6422154A/en
Application granted granted Critical
Publication of JP2618900B2 publication Critical patent/JP2618900B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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  • Devices For Supply Of Signal Current (AREA)

Abstract

PURPOSE:To correctly execute the start and stop of the supply of a call signal always in a zero cross by detecting the zero cross with a signal component depending upon a call signal voltage at a time when the current of the call signal goes to be reduced. CONSTITUTION:By a zero cross detector 5, a first signal synchronizing to the voltage component of the call signal is obtained by the zero cross detection of the call signal voltage, and on the other hand, by a zero cross detector 6, a second signal is obtained which, when the current of the call signal is increased, synchronizes almost to the current component and, when the call signal current is reduced, synchronizes almost to the call signal voltage. A timing control circuit 4 starts the supply of the call signal in synchronizing to the first signal and stops the supply of the call signal in synchronizing to the second signal.
JP17839587A 1987-07-17 1987-07-17 Ring signal circuit Expired - Fee Related JP2618900B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP17839587A JP2618900B2 (en) 1987-07-17 1987-07-17 Ring signal circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP17839587A JP2618900B2 (en) 1987-07-17 1987-07-17 Ring signal circuit

Publications (2)

Publication Number Publication Date
JPS6422154A true JPS6422154A (en) 1989-01-25
JP2618900B2 JP2618900B2 (en) 1997-06-11

Family

ID=16047749

Family Applications (1)

Application Number Title Priority Date Filing Date
JP17839587A Expired - Fee Related JP2618900B2 (en) 1987-07-17 1987-07-17 Ring signal circuit

Country Status (1)

Country Link
JP (1) JP2618900B2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05207136A (en) * 1992-01-29 1993-08-13 Nitsuko Corp System for controlling calling signal of subscriber line circuit

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05207136A (en) * 1992-01-29 1993-08-13 Nitsuko Corp System for controlling calling signal of subscriber line circuit

Also Published As

Publication number Publication date
JP2618900B2 (en) 1997-06-11

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Legal Events

Date Code Title Description
LAPS Cancellation because of no payment of annual fees