JPS57211865A - Bi-directional duplex communication device - Google Patents

Bi-directional duplex communication device

Info

Publication number
JPS57211865A
JPS57211865A JP56097319A JP9731981A JPS57211865A JP S57211865 A JPS57211865 A JP S57211865A JP 56097319 A JP56097319 A JP 56097319A JP 9731981 A JP9731981 A JP 9731981A JP S57211865 A JPS57211865 A JP S57211865A
Authority
JP
Japan
Prior art keywords
signal
voice
data
amplifier
transmission line
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
JP56097319A
Other languages
Japanese (ja)
Other versions
JPS6321386B2 (en
Inventor
Hiroshi Hasegawa
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.)
TOUA TOKUSHIYU DENKI KK
Toa Corp
Toa Tokushu Denki KK
Original Assignee
TOUA TOKUSHIYU DENKI KK
Toa Electric Co Ltd
Toa Tokushu Denki KK
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 TOUA TOKUSHIYU DENKI KK, Toa Electric Co Ltd, Toa Tokushu Denki KK filed Critical TOUA TOKUSHIYU DENKI KK
Priority to JP56097319A priority Critical patent/JPS57211865A/en
Publication of JPS57211865A publication Critical patent/JPS57211865A/en
Publication of JPS6321386B2 publication Critical patent/JPS6321386B2/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
    • H04M11/062—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 prevent data and voice signals from mutual influences when both the signals are transmitted bi-directionally through the same transmission line by connecting subtracting circuits between the input and output terminals respectively. CONSTITUTION:When a data signal Ds is inputted to a data input terminal 79b, the input signal is modulated into a burst signal Bs with a tone frequency (f) included in a voice frequency band by a code modulating circuit 59b and supplied to an I/O part A through a transformer 66b and a transmission line 64a. Said input signal is amplified by an amplifier 50a and, even if a voice signal Vs is inputted simultaneously, only a burst signal Bs is selected by a band-pass filter 58a and demodulated and decoded into a data signal Ds. Said burst signal is simultaneously supplied to a subtracting circuit 74b. When a voice signal is not sent from the I/O part A, no signal is outputted from an amplifier 75b, but if a voice signal arrives, a voice signal is outputted from the subtracting circuit 74b to the amplifier 75b. In the same manner, voice and data signals are transmitted bi-directionally through a transmission line 64b.
JP56097319A 1981-06-22 1981-06-22 Bi-directional duplex communication device Granted JPS57211865A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56097319A JPS57211865A (en) 1981-06-22 1981-06-22 Bi-directional duplex communication device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56097319A JPS57211865A (en) 1981-06-22 1981-06-22 Bi-directional duplex communication device

Publications (2)

Publication Number Publication Date
JPS57211865A true JPS57211865A (en) 1982-12-25
JPS6321386B2 JPS6321386B2 (en) 1988-05-06

Family

ID=14189159

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56097319A Granted JPS57211865A (en) 1981-06-22 1981-06-22 Bi-directional duplex communication device

Country Status (1)

Country Link
JP (1) JPS57211865A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61109250U (en) * 1984-12-21 1986-07-10

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5117605A (en) * 1974-08-02 1976-02-12 Hitachi Ltd
JPS5457804A (en) * 1977-10-17 1979-05-10 Toshiba Corp Two-way information transmitter-receiver

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5117605A (en) * 1974-08-02 1976-02-12 Hitachi Ltd
JPS5457804A (en) * 1977-10-17 1979-05-10 Toshiba Corp Two-way information transmitter-receiver

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61109250U (en) * 1984-12-21 1986-07-10

Also Published As

Publication number Publication date
JPS6321386B2 (en) 1988-05-06

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