JPS5730451A - Modulator and demodulator of information processing center - Google Patents

Modulator and demodulator of information processing center

Info

Publication number
JPS5730451A
JPS5730451A JP10525080A JP10525080A JPS5730451A JP S5730451 A JPS5730451 A JP S5730451A JP 10525080 A JP10525080 A JP 10525080A JP 10525080 A JP10525080 A JP 10525080A JP S5730451 A JPS5730451 A JP S5730451A
Authority
JP
Japan
Prior art keywords
signal
multifrequency
response
demodulator
modulator
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
JP10525080A
Other languages
Japanese (ja)
Inventor
Takeshi Nakayama
Kunio Tabata
Kenichiro Kunikata
Tatsuo Kimura
Naohiro Masunaga
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.)
Fujitsu Ltd
Original Assignee
Fujitsu 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 Fujitsu Ltd filed Critical Fujitsu Ltd
Priority to JP10525080A priority Critical patent/JPS5730451A/en
Publication of JPS5730451A publication Critical patent/JPS5730451A/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
    • H04M11/066—Telephone sets adapted for data transmision

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
  • Communication Control (AREA)

Abstract

PURPOSE:To simplify the constitution of a circuit connecting mechanism by adding the functions of a multifrequency signal receiver to the modulator and demodulator of an information processing center and by switching operations in response to a signal from the circuit connecting mechanism. CONSTITUTION:A modulator and demodulator (MODEN) MOD has the function of detecting a multifrequency signal, the function of converting digitized four-bit multifrequency signal information into a series signal, and the function of switching and sending series signals to a signal line RD. When an operator at a terminal which is not in the figure dials some number with the handset off the hook, a call display signal Ci is inputted to a communication controller NCU and after a connection, a terminal ready signal ER arrives, so that the MODEM MOD sends back a data set ready signal DR. In response to a switching signal SEL from a voice response adapter VOA, an audio response is made and when a push-button signal is received from a push-button telephone as a terminal, it is sent from the signal line RD to a circuit adapter LA, which composes one character and performs successive reception. Then, the MODEM MOD finishes the reception of the multifrequency signal and received data.
JP10525080A 1980-07-31 1980-07-31 Modulator and demodulator of information processing center Pending JPS5730451A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP10525080A JPS5730451A (en) 1980-07-31 1980-07-31 Modulator and demodulator of information processing center

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP10525080A JPS5730451A (en) 1980-07-31 1980-07-31 Modulator and demodulator of information processing center

Publications (1)

Publication Number Publication Date
JPS5730451A true JPS5730451A (en) 1982-02-18

Family

ID=14402401

Family Applications (1)

Application Number Title Priority Date Filing Date
JP10525080A Pending JPS5730451A (en) 1980-07-31 1980-07-31 Modulator and demodulator of information processing center

Country Status (1)

Country Link
JP (1) JPS5730451A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59165543A (en) * 1983-03-09 1984-09-18 Fujitsu Ltd Key distribution system of cipher device

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59165543A (en) * 1983-03-09 1984-09-18 Fujitsu Ltd Key distribution system of cipher device
JPH0456504B2 (en) * 1983-03-09 1992-09-08 Fujitsu Ltd

Similar Documents

Publication Publication Date Title
US5117450A (en) Cellular telephone with standard telephone set
NZ233606A (en) Standard telephone set interfaced to cellular transceiver
CA2006140A1 (en) Communication device connected to telephone line together with telephone set
JPS5672567A (en) Automatic message communication system
GB1352212A (en) Remote control telephone apparatus
GB1277535A (en) Improvements in or relating to multiple data sets
JPS5730451A (en) Modulator and demodulator of information processing center
GB1085938A (en) Voice-frequency key dialling telephone system
JPS562778A (en) Data communication unit
JPS5664524A (en) Telephone installed on travelling object
GB1020404A (en) Improvements in or relating to telephone systems
IE49774B1 (en) Digital telephone station
JPS574649A (en) Calling system for combined circuit of data terminal and telephone terminal
JPS5690670A (en) Communication system
JPS5974759A (en) Changing device of abbreviated dial storage
JPS54158106A (en) Incoming switch system to telephone set equipment or picture communication equipment in telephone circuit
JPS62257257A (en) Telephone line changing-over control device
JPS5451702A (en) Automatic power supply cut-off circuit
JPS5758452A (en) Button telephone device
WO1988002964A1 (en) Telephone system
JPS58187050A (en) Automatic dial device
SU720787A1 (en) Customer telephone device
JPS6075195A (en) Dial pulse reception system
JPS5643860A (en) Signal discrimination system of circuit terminal
JPS5577270A (en) Communication unit