JPS5714231A - Voice signal switching device - Google Patents

Voice signal switching device

Info

Publication number
JPS5714231A
JPS5714231A JP8894380A JP8894380A JPS5714231A JP S5714231 A JPS5714231 A JP S5714231A JP 8894380 A JP8894380 A JP 8894380A JP 8894380 A JP8894380 A JP 8894380A JP S5714231 A JPS5714231 A JP S5714231A
Authority
JP
Japan
Prior art keywords
circuit
synchronism
abnormal
sent
data
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
JP8894380A
Other languages
Japanese (ja)
Inventor
Kenji Hashi
Ichiji Munesawa
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 JP8894380A priority Critical patent/JPS5714231A/en
Publication of JPS5714231A publication Critical patent/JPS5714231A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L7/00—Arrangements for synchronising receiver with transmitter
    • H04L7/0079—Receiver details
    • H04L7/0083—Receiver details taking measures against momentary loss of synchronisation, e.g. inhibiting the synchronisation, using idle words or using redundant clocks

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Use Of Switch Circuits For Exchanges And Methods Of Control Of Multiplex Exchanges (AREA)
  • Time-Division Multiplex Systems (AREA)
  • Transmission Systems Not Characterized By The Medium Used For Transmission (AREA)

Abstract

PURPOSE:To eliminate noises due to abnormal synchronism occurring when a device is troubled, by detecting the abnormal synchronism of multiplexed PCM voice signals by the checking circuit of a demodulator, and by fixing voice signal data as data with a no-signal level when the abnormal synchronism is found. CONSTITUTION:Multiplex PCM voice signals selected by a changeover circuit are sent to a clock generating circuit 4, and a clock regenerated by the circuit is frequency-divided by a counter circuit 18, whose output is sent to a synchronism checking circuit 19. A voice signal sent to a shift register 5, on the other hand, is sent to the circuit 19 via a synchronous separating circuit 6. Then, the detected synchronizing signal from the circuit 6 and the clock from the circuit 18 are compared mutually by the synchronism checking circuit in terms of timing to check the existence of abnormal synchronism. When they are not synchronized with each other, a switching control signal Se is sent to a data switching circuit 7 to select no-sound level data, so that noises due to abnormal synchronism occurring when a device is troubled are prevented.
JP8894380A 1980-06-30 1980-06-30 Voice signal switching device Pending JPS5714231A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP8894380A JPS5714231A (en) 1980-06-30 1980-06-30 Voice signal switching device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8894380A JPS5714231A (en) 1980-06-30 1980-06-30 Voice signal switching device

Publications (1)

Publication Number Publication Date
JPS5714231A true JPS5714231A (en) 1982-01-25

Family

ID=13956956

Family Applications (1)

Application Number Title Priority Date Filing Date
JP8894380A Pending JPS5714231A (en) 1980-06-30 1980-06-30 Voice signal switching device

Country Status (1)

Country Link
JP (1) JPS5714231A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02143734A (en) * 1988-11-25 1990-06-01 Sumitomo Electric Ind Ltd Voice digital transmission system

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02143734A (en) * 1988-11-25 1990-06-01 Sumitomo Electric Ind Ltd Voice digital transmission system

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