JPS57115033A - Data transmission and reception device - Google Patents
Data transmission and reception deviceInfo
- Publication number
- JPS57115033A JPS57115033A JP109081A JP109081A JPS57115033A JP S57115033 A JPS57115033 A JP S57115033A JP 109081 A JP109081 A JP 109081A JP 109081 A JP109081 A JP 109081A JP S57115033 A JPS57115033 A JP S57115033A
- Authority
- JP
- Japan
- Prior art keywords
- noise
- data signal
- signal
- cable
- level
- 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
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B3/00—Line transmission systems
- H04B3/02—Details
- H04B3/04—Control of transmission; Equalising
- H04B3/10—Control of transmission; Equalising by pilot signal
- H04B3/11—Control of transmission; Equalising by pilot signal using pilot wire
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Detection And Prevention Of Errors In Transmission (AREA)
- Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
- Noise Elimination (AREA)
Abstract
PURPOSE:To enable stable communication with less error rate even on a communication line of high noise, by cancelling noise superimposed on a data signal through the use of noise signal induced in a noise detection cable and controlling the data signal level and the reception signal level against noise signal level. CONSTITUTION:A data signal from a transmitter 2 is appied to a variable gain amplifier 11 and controlled according to the noise signal level induced in a noise detection cable 16 and applied to a communication cable 9 via a transformer 4. The received data signal is applied to a noise separator 21, the noise signal is subtracted and applied to a variable attenuator 19. The data signal is attenuated with a variable attenuator 19 according to the level of noise signal from the cable 16 and applied to a receiver 7.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP109081A JPS57115033A (en) | 1981-01-09 | 1981-01-09 | Data transmission and reception device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP109081A JPS57115033A (en) | 1981-01-09 | 1981-01-09 | Data transmission and reception device |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS57115033A true JPS57115033A (en) | 1982-07-17 |
Family
ID=11491797
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP109081A Pending JPS57115033A (en) | 1981-01-09 | 1981-01-09 | Data transmission and reception device |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS57115033A (en) |
-
1981
- 1981-01-09 JP JP109081A patent/JPS57115033A/en active Pending
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