JPS5791067A - Data transmission and reception device - Google Patents

Data transmission and reception device

Info

Publication number
JPS5791067A
JPS5791067A JP55166553A JP16655380A JPS5791067A JP S5791067 A JPS5791067 A JP S5791067A JP 55166553 A JP55166553 A JP 55166553A JP 16655380 A JP16655380 A JP 16655380A JP S5791067 A JPS5791067 A JP S5791067A
Authority
JP
Japan
Prior art keywords
signal
switching
control signal
mode
data transmission
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
JP55166553A
Other languages
Japanese (ja)
Inventor
Mitsunari Kano
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 JP55166553A priority Critical patent/JPS5791067A/en
Publication of JPS5791067A publication Critical patent/JPS5791067A/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)
  • Communication Control (AREA)

Abstract

PURPOSE:To realize the transmitter and receiver with a circuit constitution of small scale and low cost, by using a signal frequency signal as a switching control signal, in a communication system which switch data and audio communication alternately. CONSTITUTION:As a switching control signal of call mode and data communication mode, a signal frequency signal is used, and the mode switching and formation of a callout signal for caller can be made stably with a small scale circuit, by using band pass filter for the switching of audio signal and control signal during call.
JP55166553A 1980-11-28 1980-11-28 Data transmission and reception device Pending JPS5791067A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP55166553A JPS5791067A (en) 1980-11-28 1980-11-28 Data transmission and reception device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP55166553A JPS5791067A (en) 1980-11-28 1980-11-28 Data transmission and reception device

Publications (1)

Publication Number Publication Date
JPS5791067A true JPS5791067A (en) 1982-06-07

Family

ID=15833391

Family Applications (1)

Application Number Title Priority Date Filing Date
JP55166553A Pending JPS5791067A (en) 1980-11-28 1980-11-28 Data transmission and reception device

Country Status (1)

Country Link
JP (1) JPS5791067A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4467142A (en) * 1981-09-18 1984-08-21 Licentia Patent-Verwaltungs-Gmbh System for transmitting emergency calls from persons requiring assistance
US5752216A (en) * 1994-07-06 1998-05-12 Dimensions International, Inc. Non-intrusive data interface system for air traffic control

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4467142A (en) * 1981-09-18 1984-08-21 Licentia Patent-Verwaltungs-Gmbh System for transmitting emergency calls from persons requiring assistance
US5752216A (en) * 1994-07-06 1998-05-12 Dimensions International, Inc. Non-intrusive data interface system for air traffic control

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