JPS5531366A - Disengaged line signal detection system - Google Patents

Disengaged line signal detection system

Info

Publication number
JPS5531366A
JPS5531366A JP10513578A JP10513578A JPS5531366A JP S5531366 A JPS5531366 A JP S5531366A JP 10513578 A JP10513578 A JP 10513578A JP 10513578 A JP10513578 A JP 10513578A JP S5531366 A JPS5531366 A JP S5531366A
Authority
JP
Japan
Prior art keywords
line signal
disengaged
disengaged line
signal
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
JP10513578A
Other languages
Japanese (ja)
Other versions
JPS5726019B2 (en
Inventor
Shinichi Kuriaki
Mitsukazu Koyama
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.)
Fujitsu Ltd
Original Assignee
Fujitsu 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 Fujitsu Ltd filed Critical Fujitsu Ltd
Priority to JP10513578A priority Critical patent/JPS5531366A/en
Publication of JPS5531366A publication Critical patent/JPS5531366A/en
Publication of JPS5726019B2 publication Critical patent/JPS5726019B2/ja
Granted legal-status Critical Current

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Abstract

PURPOSE: To prevent wrong detection of the disengaged line signal and to catch the disengaged line signal swiftly and correctly by detecting the disengaged line signal by use of the outputs of the voice zone element detection circuit out of the control signal and the control signal element detection circuit, together with the output of the signal demodulation circuit.
CONSTITUTION: In case the disengaged line signal has not been detected, an output exists in the control signal element circuit 40, while an output does not exist in the voice zone element detection circuit 39 out of the control signal, and when the disengaged line singal has appeared in the output of the signal demodulation circuit 38, it is judged that the disengaged line signal has been detected. And after the disengaged line signal has been detected, in case an output does not exist in the circuit 40, or an output exists in the circuit 39, it is judged that the disengaged line signal has not been detected yet, and the operation is shifted to detection of the disengaged line signal. Thus, it is possible to prevent wrong detection of the disengaged line signal, and to catch the disengaged line signal swiftly and correctly.
COPYRIGHT: (C)1980,JPO&Japio
JP10513578A 1978-08-29 1978-08-29 Disengaged line signal detection system Granted JPS5531366A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP10513578A JPS5531366A (en) 1978-08-29 1978-08-29 Disengaged line signal detection system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP10513578A JPS5531366A (en) 1978-08-29 1978-08-29 Disengaged line signal detection system

Publications (2)

Publication Number Publication Date
JPS5531366A true JPS5531366A (en) 1980-03-05
JPS5726019B2 JPS5726019B2 (en) 1982-06-02

Family

ID=14399299

Family Applications (1)

Application Number Title Priority Date Filing Date
JP10513578A Granted JPS5531366A (en) 1978-08-29 1978-08-29 Disengaged line signal detection system

Country Status (1)

Country Link
JP (1) JPS5531366A (en)

Also Published As

Publication number Publication date
JPS5726019B2 (en) 1982-06-02

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