JPS5479508A - Change-over system for signal level - Google Patents
Change-over system for signal levelInfo
- Publication number
- JPS5479508A JPS5479508A JP14677677A JP14677677A JPS5479508A JP S5479508 A JPS5479508 A JP S5479508A JP 14677677 A JP14677677 A JP 14677677A JP 14677677 A JP14677677 A JP 14677677A JP S5479508 A JPS5479508 A JP S5479508A
- Authority
- JP
- Japan
- Prior art keywords
- pulse
- signal
- cable
- length
- change
- 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
Landscapes
- Dc Digital Transmission (AREA)
- Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
Abstract
PURPOSE: To change over signal levels automatically corresponding to the length of a transmission cable by extracting a delay pulse made to take a U-turn at the cable conductor of the transmission cable with the other terminal shorted and by varying the level of a transmitting signal depeding upon the delay time.
CONSTITUTION: One-side terminal parts 13 of two cable conductors of transmission line 11 are shorted and U-turn lines 11a and 11b are provided. When it is detected that the power supply is put to work, one pulse generated and compared with the pulse obtained by delaying this pulse by delay circuit 21 via U-turn lines 11a and 11b, so that when the delay time is more than a certain time proportional to the length of transmission line 11, a signal-level change-over pulse will be outputted from line 11c. Consequently, the obtained pulse allows signal level converter part 15 to vary the levels of transmitting signals of the 1st and 2nd devices 14 and 16. As a result, signal levels can be changed over automatically corresponding to the length of the transmission cable.
COPYRIGHT: (C)1979,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP14677677A JPS5479508A (en) | 1977-12-07 | 1977-12-07 | Change-over system for signal level |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP14677677A JPS5479508A (en) | 1977-12-07 | 1977-12-07 | Change-over system for signal level |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5479508A true JPS5479508A (en) | 1979-06-25 |
Family
ID=15415271
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP14677677A Pending JPS5479508A (en) | 1977-12-07 | 1977-12-07 | Change-over system for signal level |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5479508A (en) |
-
1977
- 1977-12-07 JP JP14677677A patent/JPS5479508A/en active Pending
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