JPS57143975A - Transmission system for push-button information - Google Patents

Transmission system for push-button information

Info

Publication number
JPS57143975A
JPS57143975A JP2847181A JP2847181A JPS57143975A JP S57143975 A JPS57143975 A JP S57143975A JP 2847181 A JP2847181 A JP 2847181A JP 2847181 A JP2847181 A JP 2847181A JP S57143975 A JPS57143975 A JP S57143975A
Authority
JP
Japan
Prior art keywords
signal
push
generating circuit
multifrequency
button switches
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
JP2847181A
Other languages
English (en)
Japanese (ja)
Other versions
JPS63982B2 (enrdf_load_stackoverflow
Inventor
Tetsuo Takemura
Takao Kato
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.)
Hitachi Ltd
Original Assignee
Hitachi 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 Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP2847181A priority Critical patent/JPS57143975A/ja
Publication of JPS57143975A publication Critical patent/JPS57143975A/ja
Publication of JPS63982B2 publication Critical patent/JPS63982B2/ja
Granted 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
    • H04M11/066—Telephone sets adapted for data transmision

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Devices For Supply Of Signal Current (AREA)
  • Use Of Switch Circuits For Exchanges And Methods Of Control Of Multiplex Exchanges (AREA)
JP2847181A 1981-03-02 1981-03-02 Transmission system for push-button information Granted JPS57143975A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2847181A JPS57143975A (en) 1981-03-02 1981-03-02 Transmission system for push-button information

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2847181A JPS57143975A (en) 1981-03-02 1981-03-02 Transmission system for push-button information

Publications (2)

Publication Number Publication Date
JPS57143975A true JPS57143975A (en) 1982-09-06
JPS63982B2 JPS63982B2 (enrdf_load_stackoverflow) 1988-01-09

Family

ID=12249559

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2847181A Granted JPS57143975A (en) 1981-03-02 1981-03-02 Transmission system for push-button information

Country Status (1)

Country Link
JP (1) JPS57143975A (enrdf_load_stackoverflow)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59100661A (ja) * 1982-11-30 1984-06-09 Toshiba Corp 音声・デ−タ交換システム

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59100661A (ja) * 1982-11-30 1984-06-09 Toshiba Corp 音声・デ−タ交換システム

Also Published As

Publication number Publication date
JPS63982B2 (enrdf_load_stackoverflow) 1988-01-09

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