JPS57133744A - Digital telephone set - Google Patents

Digital telephone set

Info

Publication number
JPS57133744A
JPS57133744A JP1873881A JP1873881A JPS57133744A JP S57133744 A JPS57133744 A JP S57133744A JP 1873881 A JP1873881 A JP 1873881A JP 1873881 A JP1873881 A JP 1873881A JP S57133744 A JPS57133744 A JP S57133744A
Authority
JP
Japan
Prior art keywords
signal
burst signal
converted
audio frequency
code
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
JP1873881A
Other languages
Japanese (ja)
Inventor
Hatsuki Kawamata
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.)
NEC Corp
Original Assignee
NEC Corp
Nippon Electric Co 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 NEC Corp, Nippon Electric Co Ltd filed Critical NEC Corp
Priority to JP1873881A priority Critical patent/JPS57133744A/en
Publication of JPS57133744A publication Critical patent/JPS57133744A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/253—Telephone sets using digital voice transmission

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Devices For Supply Of Signal Current (AREA)

Abstract

PURPOSE:To decrease the scale of circuit, by directly converting an audio frequency signal into digitized information burst signal and the digitized information burst signal into the audio frequency signal. CONSTITUTION:An audio frequency signal from a transmitter 21 is digitized at a converter 23 and converted into burst shape information burst signal. On the other hand, a service signal from a signal generator 25 is converted into a control bit signal at a coder 27 and given to a code multiplexer 31 together with an information burst signal. A code multiplexer 31 sums up the information burst signal, control bit signal and synchronizing bit signal, and the result is converted into a code burst signal and transmitted to a subscriber line 15 as a transmission line burst signal of bipolar via a 4-2 line converter 33. At reception, the reverse route is followed, and the code burst signal is converted into the audio frequency signal via the information burst signal.
JP1873881A 1981-02-10 1981-02-10 Digital telephone set Pending JPS57133744A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1873881A JPS57133744A (en) 1981-02-10 1981-02-10 Digital telephone set

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1873881A JPS57133744A (en) 1981-02-10 1981-02-10 Digital telephone set

Publications (1)

Publication Number Publication Date
JPS57133744A true JPS57133744A (en) 1982-08-18

Family

ID=11980003

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1873881A Pending JPS57133744A (en) 1981-02-10 1981-02-10 Digital telephone set

Country Status (1)

Country Link
JP (1) JPS57133744A (en)

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