JPS5560365A - Supervisory system - Google Patents

Supervisory system

Info

Publication number
JPS5560365A
JPS5560365A JP13339078A JP13339078A JPS5560365A JP S5560365 A JPS5560365 A JP S5560365A JP 13339078 A JP13339078 A JP 13339078A JP 13339078 A JP13339078 A JP 13339078A JP S5560365 A JPS5560365 A JP S5560365A
Authority
JP
Japan
Prior art keywords
signal
decoder
polygonal line
companding
coder
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
JP13339078A
Other languages
Japanese (ja)
Inventor
Takashi Matsuda
Koji Mizushima
Masahiko Matsushita
Yasuo Ito
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
NEC Corp
Nippon Telegraph and Telephone Corp
Original Assignee
Fujitsu Ltd
NEC Corp
Nippon Telegraph and Telephone Corp
Nippon 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 Fujitsu Ltd, NEC Corp, Nippon Telegraph and Telephone Corp, Nippon Electric Co Ltd filed Critical Fujitsu Ltd
Priority to JP13339078A priority Critical patent/JPS5560365A/en
Publication of JPS5560365A publication Critical patent/JPS5560365A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/24—Testing correct operation

Abstract

PURPOSE:To exercise an economical and highly-reliable supervision, by making a PCM terminal equipment, using a coder and decoder with polygonal line companding characteristics, generate and detect a supervisory signal digitally in addition to an intra-office supervision by intra-office reflection. CONSTITUTION:In a PCM terminal equipment using a coder with polygonal line companding characteristics, a digital supervisory signal from reference digital code generating circuit 1 which generates one or several specific patterns in a segment of polygonal line companding law is decoded by decoder 5 into a PAM signal. Then, the PAM signal is decoded by decoder 10 into a digital supervisory signal, which is compared with a signal from the reference digital code generating circuit, so that when the both disagree each other, an alarm signal will be sent out.
JP13339078A 1978-10-30 1978-10-30 Supervisory system Pending JPS5560365A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP13339078A JPS5560365A (en) 1978-10-30 1978-10-30 Supervisory system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP13339078A JPS5560365A (en) 1978-10-30 1978-10-30 Supervisory system

Publications (1)

Publication Number Publication Date
JPS5560365A true JPS5560365A (en) 1980-05-07

Family

ID=15103616

Family Applications (1)

Application Number Title Priority Date Filing Date
JP13339078A Pending JPS5560365A (en) 1978-10-30 1978-10-30 Supervisory system

Country Status (1)

Country Link
JP (1) JPS5560365A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03216022A (en) * 1990-01-20 1991-09-24 Fujitsu Ltd Voice encoder/decoder

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03216022A (en) * 1990-01-20 1991-09-24 Fujitsu Ltd Voice encoder/decoder

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