JPS5714231A - Voice signal switching device - Google Patents
Voice signal switching deviceInfo
- 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
Links
- 230000002159 abnormal effect Effects 0.000 abstract 5
- 230000001360 synchronised effect Effects 0.000 abstract 2
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)
- Time-Division Multiplex Systems (AREA)
- Transmission Systems Not Characterized By The Medium Used For Transmission (AREA)
- Use Of Switch Circuits For Exchanges And Methods Of Control Of Multiplex Exchanges (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.
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)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02143734A (en) * | 1988-11-25 | 1990-06-01 | Sumitomo Electric Ind Ltd | Voice digital transmission system |
-
1980
- 1980-06-30 JP JP8894380A patent/JPS5714231A/en active Pending
Cited By (1)
| 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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