GB501028A - Improvements in or relating to electric signalling systems - Google Patents
Improvements in or relating to electric signalling systemsInfo
- Publication number
- GB501028A GB501028A GB2290337A GB2290337A GB501028A GB 501028 A GB501028 A GB 501028A GB 2290337 A GB2290337 A GB 2290337A GB 2290337 A GB2290337 A GB 2290337A GB 501028 A GB501028 A GB 501028A
- Authority
- GB
- United Kingdom
- Prior art keywords
- equipment
- pentode
- signal
- transformer
- shd
- 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.)
- Expired
Links
- 230000011664 signaling Effects 0.000 title 1
- 101100533625 Neurospora crassa (strain ATCC 24698 / 74-OR23-1A / CBS 708.71 / DSM 1257 / FGSC 987) drc-4 gene Proteins 0.000 abstract 2
- 101150090425 SLD1 gene Proteins 0.000 abstract 2
- 101150033482 SLD2 gene Proteins 0.000 abstract 2
- 101100533627 Schizosaccharomyces pombe (strain 972 / ATCC 24843) drc1 gene Proteins 0.000 abstract 2
- 230000005540 biological transmission Effects 0.000 abstract 2
- 101100440887 Drosophila melanogaster shd gene Proteins 0.000 abstract 1
- 101100310210 Mus musculus Shd gene Proteins 0.000 abstract 1
- 230000001771 impaired effect Effects 0.000 abstract 1
- 238000004804 winding Methods 0.000 abstract 1
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J1/00—Frequency-division multiplex systems
- H04J1/02—Details
- H04J1/14—Arrangements providing for calling or supervisory signals
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J1/00—Details of electrodes, of magnetic control means, of screens, or of the mounting or spacing thereof, common to two or more basic types of discharge tubes or lamps
- H01J1/02—Main electrodes
- H01J1/13—Solid thermionic cathodes
- H01J1/14—Solid thermionic cathodes characterised by the material
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q1/00—Details of selecting apparatus or arrangements
- H04Q1/18—Electrical details
- H04Q1/30—Signalling arrangements; Manipulation of signalling currents
- H04Q1/44—Signalling arrangements; Manipulation of signalling currents using alternate current
- H04Q1/444—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies
- H04Q1/446—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using one signalling frequency
- H04Q1/4465—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using one signalling frequency the same frequency being used for all signalling information, e.g. A.C. nr.9 system
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
Abstract
501,028. Two-way transmission ; automatic volume control. STANDARD TELEPHONES & CABLES, Ltd., NEILSON, C. B. V., and THOMAS, P. R. Aug. 20, 1937, No. 22903. [Claas 40 (iv)] A repeater comprising pentode or like amplifying valves in the ` go ' and return ' paths is provided with voice frequency signal responsive equipment between the pentode and the hybrid coil to which the pentode output circuit is connected, the impedance of the equipment being so chosen that transmission through the repeater is not impaired and the equipment receives adequate signal power. The signal responsive equipment may be connected across the secondary of the transformer T between the pentode V and the hybrid coil HC. Alternatively, the equipment may be connected across the primary of the transformer T in place of the resistance r, to the secondary of a transformer the primary of which is in series with the pentode output circuit, Fig. 4, or to a third winding on the transformer T as at R5, Fig. 3. The signal responsive equipment may comprise an amplifier AMP, Fig. 5, connected to acceptor circuits AC1 and AC2 tuned to again control frequency and a signal-frequency respectively. Gain control signals passing through circuit AC1 operate a relay SLD1 to energize control equipment GCD. Similarly, signal frequencies operate SLD2 to energize signal recording equipment SSR. Any voice frequency current operates an echo suppressor device ES by opening the normally closed circuit at sld1, sld2 or shd. Contacts shd are operated by a relay SHD which is operated by voice-currents other than those passed by AC1 and AC2.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NL50376D NL50376C (en) | 1937-08-20 | ||
| GB2290337A GB501028A (en) | 1937-08-20 | 1937-08-20 | Improvements in or relating to electric signalling systems |
| FR842319D FR842319A (en) | 1937-08-20 | 1938-08-19 | Signaling devices |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2290337A GB501028A (en) | 1937-08-20 | 1937-08-20 | Improvements in or relating to electric signalling systems |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB501028A true GB501028A (en) | 1939-02-20 |
Family
ID=10186920
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB2290337A Expired GB501028A (en) | 1937-08-20 | 1937-08-20 | Improvements in or relating to electric signalling systems |
Country Status (3)
| Country | Link |
|---|---|
| FR (1) | FR842319A (en) |
| GB (1) | GB501028A (en) |
| NL (1) | NL50376C (en) |
-
0
- NL NL50376D patent/NL50376C/xx active
-
1937
- 1937-08-20 GB GB2290337A patent/GB501028A/en not_active Expired
-
1938
- 1938-08-19 FR FR842319D patent/FR842319A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| NL50376C (en) | |
| FR842319A (en) | 1939-06-09 |
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