JPS51131203A - Telephone switching system - Google Patents

Telephone switching system

Info

Publication number
JPS51131203A
JPS51131203A JP5467975A JP5467975A JPS51131203A JP S51131203 A JPS51131203 A JP S51131203A JP 5467975 A JP5467975 A JP 5467975A JP 5467975 A JP5467975 A JP 5467975A JP S51131203 A JPS51131203 A JP S51131203A
Authority
JP
Japan
Prior art keywords
switching system
telephone switching
voice signals
signals
remodulating
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
JP5467975A
Other languages
Japanese (ja)
Other versions
JPS5838977B2 (en
Inventor
Tsunemi Shikauchi
Masakazu Okada
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 JP5467975A priority Critical patent/JPS5838977B2/en
Publication of JPS51131203A publication Critical patent/JPS51131203A/en
Publication of JPS5838977B2 publication Critical patent/JPS5838977B2/en
Expired legal-status Critical Current

Links

Landscapes

  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
  • Time-Division Multiplex Systems (AREA)
  • Transmission Systems Not Characterized By The Medium Used For Transmission (AREA)

Abstract

PURPOSE: The switching system incorporating a PCM micro circuit that prevents the telephone exchange quality to be degraded by transmitting voice signals in the form of digital signals and improving the signal-to-noise ratio by delta remodulating voice signals only at the intermediate relay station.
COPYRIGHT: (C)1976,JPO&Japio
JP5467975A 1975-05-12 1975-05-12 Signal transmission method Expired JPS5838977B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP5467975A JPS5838977B2 (en) 1975-05-12 1975-05-12 Signal transmission method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP5467975A JPS5838977B2 (en) 1975-05-12 1975-05-12 Signal transmission method

Publications (2)

Publication Number Publication Date
JPS51131203A true JPS51131203A (en) 1976-11-15
JPS5838977B2 JPS5838977B2 (en) 1983-08-26

Family

ID=12977464

Family Applications (1)

Application Number Title Priority Date Filing Date
JP5467975A Expired JPS5838977B2 (en) 1975-05-12 1975-05-12 Signal transmission method

Country Status (1)

Country Link
JP (1) JPS5838977B2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63131629A (en) * 1986-11-20 1988-06-03 Nec Corp Disconnecting and connecting system for ordering line

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0463562U (en) * 1990-10-12 1992-05-29

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63131629A (en) * 1986-11-20 1988-06-03 Nec Corp Disconnecting and connecting system for ordering line

Also Published As

Publication number Publication date
JPS5838977B2 (en) 1983-08-26

Similar Documents

Publication Publication Date Title
JPS5242324A (en) Chroma signal processing system
JPS5412506A (en) Time-division exchange conference system
JPS51131203A (en) Telephone switching system
JPS53140908A (en) First ringing control system in time sharing exchanger
AU497812B2 (en) Digital telephone exchange conference circuit
JPS526406A (en) Inter-frame encoding system
JPS5217739A (en) Call request sysem by voice communication
JPS5547768A (en) Facsimile callout system
JPS53117922A (en) Absence reception voice answer skip system
JPS54109709A (en) Verification system
JPS54162905A (en) Radiotelephony equipment
JPS52125213A (en) Absence transfer system
JPS51149717A (en) Solid state smage scanner
JPS5413207A (en) Fascimile reception system
JPS52154318A (en) Terminal connection method in digital data transmission system
JPS5224024A (en) Image communication system
JPS52122020A (en) Calling signal system
JPS5255812A (en) Telautographing equipment
JPS5373905A (en) Radiotelephony control system
JPS5384621A (en) Error resending system of picture signal
JPS5210103A (en) Cantilever
JPS5368012A (en) Click sound preventing system
JPS5218157A (en) Pcm encoder
JPS5313338A (en) Digital delay circuit
JPS5399803A (en) Separating signal system for subscriber's line