JPS57206145A - End office device for transport of cable telephone - Google Patents

End office device for transport of cable telephone

Info

Publication number
JPS57206145A
JPS57206145A JP9182281A JP9182281A JPS57206145A JP S57206145 A JPS57206145 A JP S57206145A JP 9182281 A JP9182281 A JP 9182281A JP 9182281 A JP9182281 A JP 9182281A JP S57206145 A JPS57206145 A JP S57206145A
Authority
JP
Japan
Prior art keywords
signal
digital
circuit
converted
ssb
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
JP9182281A
Other languages
Japanese (ja)
Inventor
Tokuhiro Kawakami
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 JP9182281A priority Critical patent/JPS57206145A/en
Publication of JPS57206145A publication Critical patent/JPS57206145A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J1/00—Frequency-division multiplex systems
    • H04J1/02—Details
    • H04J1/04—Frequency-transposition arrangements
    • H04J1/05—Frequency-transposition arrangements using digital techniques

Abstract

PURPOSE:To improve the effective use of a cable logarithm and at the same time to avoid the limitation caused to the intermediate space by the inter-cable near-end crosstalk attenuation, by combining a digital arithmetic system and a frequency dividing transmission system while using the features of a DELTAM system. CONSTITUTION:A voice band signal supplied through an input terminal 1 of said band signal is multiplexed by a muliplexing circuit 4. The multiplexed signal is converted into a linear PCM code through a DELTAM/PCM converting circuit 10. A digital processing circuit 11 converts the PCM code into a digital SSB-FDM signal through a high-speed Fourier conversion and a digital filter. The digital SSB- FDM signal is then converted into an analog SSB-FDM signal by a D/A converter 12. This analog signal is converted into a frequency band suited to the transmission of signal by a modulating circuit 13 and a carrier current supply circuit 14. A branching filter 15 is shown in the diagram.
JP9182281A 1981-06-15 1981-06-15 End office device for transport of cable telephone Pending JPS57206145A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP9182281A JPS57206145A (en) 1981-06-15 1981-06-15 End office device for transport of cable telephone

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP9182281A JPS57206145A (en) 1981-06-15 1981-06-15 End office device for transport of cable telephone

Publications (1)

Publication Number Publication Date
JPS57206145A true JPS57206145A (en) 1982-12-17

Family

ID=14037306

Family Applications (1)

Application Number Title Priority Date Filing Date
JP9182281A Pending JPS57206145A (en) 1981-06-15 1981-06-15 End office device for transport of cable telephone

Country Status (1)

Country Link
JP (1) JPS57206145A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0421489A2 (en) * 1984-03-01 1991-04-10 Sony Corporation Magnetic transducer head utilizing the magnetoresistance effect

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5739186A (en) * 1980-08-15 1982-03-04 Asahi Chem Ind Co Ltd Improved fluorine composite membrane

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5739186A (en) * 1980-08-15 1982-03-04 Asahi Chem Ind Co Ltd Improved fluorine composite membrane

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0421489A2 (en) * 1984-03-01 1991-04-10 Sony Corporation Magnetic transducer head utilizing the magnetoresistance effect
EP0544642A2 (en) * 1984-03-01 1993-06-02 Sony Corporation Magnetic transducer head apparatus utilizing the magnetoresistance effect

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