JPS5775055A - Simultaneous transmission system for sound, hand-written character, and graphic pattern - Google Patents

Simultaneous transmission system for sound, hand-written character, and graphic pattern

Info

Publication number
JPS5775055A
JPS5775055A JP55150136A JP15013680A JPS5775055A JP S5775055 A JPS5775055 A JP S5775055A JP 55150136 A JP55150136 A JP 55150136A JP 15013680 A JP15013680 A JP 15013680A JP S5775055 A JPS5775055 A JP S5775055A
Authority
JP
Japan
Prior art keywords
signal
sound
transmitted
transmission
sound signal
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
JP55150136A
Other languages
Japanese (ja)
Inventor
Kenji Akiyama
Tomio Kishimoto
Yuichi Sato
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 JP55150136A priority Critical patent/JPS5775055A/en
Publication of JPS5775055A publication Critical patent/JPS5775055A/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
    • H04M11/062—Simultaneous speech and data transmission, e.g. telegraphic transmission over the same conductors using different frequency bands for speech and other data

Abstract

PURPOSE:To restrain degradation of the sound quality to a minimum, by not limiting the band width of a sound signal normally but limiting it only when the picture signal for hand-written characters, graphic patterns, etc. is transmitted. CONSTITUTION:In case that only a sound signal is inputted from an input terminal 1 and is transmitted in the transmission side, a switch 6 is connected to the side of a contact (a) by a switching signal 41 from a transmission control circuit 100, and the sound signal passes through a filter having a characteristic (a) to have the control signal band reduced and is supplied to a mixer 3 and is mixed with a control signal 4 from the control circuit 100 and is transmitted from an output terminal 7. In case that the picture signal for characters, graphic patterns, etc. is transmitted simultaneously with transmission of the sound signal, the transmission control circuit 100 counnects the switch 6 to the side of a contact (b) by the switching signal 41 after outputting the control signal 4. At this time, the sound signal has the band width limited by a filter 8 having a characteristic (b), and the picture signal from an input terminal 10 is multiplexed in the limited band, and they are transmitted. In the receiving side, filters are switched in accordance with the control signal to receive signals.
JP55150136A 1980-10-28 1980-10-28 Simultaneous transmission system for sound, hand-written character, and graphic pattern Pending JPS5775055A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP55150136A JPS5775055A (en) 1980-10-28 1980-10-28 Simultaneous transmission system for sound, hand-written character, and graphic pattern

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP55150136A JPS5775055A (en) 1980-10-28 1980-10-28 Simultaneous transmission system for sound, hand-written character, and graphic pattern

Publications (1)

Publication Number Publication Date
JPS5775055A true JPS5775055A (en) 1982-05-11

Family

ID=15490267

Family Applications (1)

Application Number Title Priority Date Filing Date
JP55150136A Pending JPS5775055A (en) 1980-10-28 1980-10-28 Simultaneous transmission system for sound, hand-written character, and graphic pattern

Country Status (1)

Country Link
JP (1) JPS5775055A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62257258A (en) * 1986-04-30 1987-11-09 Toyo Commun Equip Co Ltd Sound/image half double transmission equipment

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5084103A (en) * 1973-11-27 1975-07-07
JPS5311510A (en) * 1976-07-19 1978-02-02 Fujitsu Ltd Information signal multiplex communication system
JPS5338202A (en) * 1976-09-21 1978-04-08 Kokusai Denshin Denwa Co Ltd Multiplex communication system

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5084103A (en) * 1973-11-27 1975-07-07
JPS5311510A (en) * 1976-07-19 1978-02-02 Fujitsu Ltd Information signal multiplex communication system
JPS5338202A (en) * 1976-09-21 1978-04-08 Kokusai Denshin Denwa Co Ltd Multiplex communication system

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62257258A (en) * 1986-04-30 1987-11-09 Toyo Commun Equip Co Ltd Sound/image half double transmission equipment

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