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JPS5558658A - Subscriber's line telephone transmission system - Google Patents

Subscriber's line telephone transmission system

Info

Publication number
JPS5558658A
JPS5558658A JP13104378A JP13104378A JPS5558658A JP S5558658 A JPS5558658 A JP S5558658A JP 13104378 A JP13104378 A JP 13104378A JP 13104378 A JP13104378 A JP 13104378A JP S5558658 A JPS5558658 A JP S5558658A
Authority
JP
Japan
Prior art keywords
signals
time base
subscriber
line
receiving
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
JP13104378A
Other languages
Japanese (ja)
Inventor
Fujio Amamiya
Isao Kawashima
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 JP13104378A priority Critical patent/JPS5558658A/en
Publication of JPS5558658A publication Critical patent/JPS5558658A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M11/00—Telephonic communication systems specially adapted for combination with other electrical systems
    • H04M11/06—Simultaneous speech and data transmission, e.g. telegraphic transmission over the same conductors

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Time-Division Multiplex Systems (AREA)
  • Reduction Or Emphasis Of Bandwidth Of Signals (AREA)

Abstract

PURPOSE:To multiplex a line and eliminate side tone completely by compressing the time base of sound signals, etc., and performing the multiple use of a subscriber's line and performing transmission and receiving alternately. CONSTITUTION:Terminals 24a-24m have a signal time base compressing means respectively and are equipped with a means, which detects control signals corresponding to its own channel from control signals transmitted from synchronizing signal transmission circuit 22, respectively and are operated synchronously with control signals. A multiplex frame constitution is adopted for time base-compressed sound signals, etc., and they are sent to the exchanged side through subscriber's line 19 and are separated into analogue signals and digital signals by circuit 20. Digital signals are sent to exchange 23 as they are, and analogue signals have the time base expanded by circuit 21 and are expanded for respective channels and are transmitted to exchange 23. Next, the operation opposite to the above is performed for receiving in the terminal side. Then, in respect to a channel assigned to each terminal, the first half and the latter half are used for transmission and receiving respectively.
JP13104378A 1978-10-26 1978-10-26 Subscriber's line telephone transmission system Pending JPS5558658A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP13104378A JPS5558658A (en) 1978-10-26 1978-10-26 Subscriber's line telephone transmission system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP13104378A JPS5558658A (en) 1978-10-26 1978-10-26 Subscriber's line telephone transmission system

Publications (1)

Publication Number Publication Date
JPS5558658A true JPS5558658A (en) 1980-05-01

Family

ID=15048676

Family Applications (1)

Application Number Title Priority Date Filing Date
JP13104378A Pending JPS5558658A (en) 1978-10-26 1978-10-26 Subscriber's line telephone transmission system

Country Status (1)

Country Link
JP (1) JPS5558658A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58170240A (en) * 1982-03-31 1983-10-06 Fujitsu Ltd Digital radio communication system
JPS58191551A (en) * 1982-05-06 1983-11-08 Nec Home Electronics Ltd Transmitting and reception method of time division sound multiplexing
JPS6119249A (en) * 1984-06-29 1986-01-28 シーメンス、アクチエンゲゼルシヤフト Signal transmitting method and device

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS498113A (en) * 1972-05-10 1974-01-24
JPS4929709A (en) * 1972-07-19 1974-03-16
JPS5011117A (en) * 1973-05-28 1975-02-05

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS498113A (en) * 1972-05-10 1974-01-24
JPS4929709A (en) * 1972-07-19 1974-03-16
JPS5011117A (en) * 1973-05-28 1975-02-05

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58170240A (en) * 1982-03-31 1983-10-06 Fujitsu Ltd Digital radio communication system
JPS58191551A (en) * 1982-05-06 1983-11-08 Nec Home Electronics Ltd Transmitting and reception method of time division sound multiplexing
JPS6119249A (en) * 1984-06-29 1986-01-28 シーメンス、アクチエンゲゼルシヤフト Signal transmitting method and device

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