GB457776A - Improvements in or relating to the electrical transmission of telegraphic, telephonic or other signals - Google Patents
Improvements in or relating to the electrical transmission of telegraphic, telephonic or other signalsInfo
- Publication number
- GB457776A GB457776A GB16119/35A GB1611935A GB457776A GB 457776 A GB457776 A GB 457776A GB 16119/35 A GB16119/35 A GB 16119/35A GB 1611935 A GB1611935 A GB 1611935A GB 457776 A GB457776 A GB 457776A
- Authority
- GB
- United Kingdom
- Prior art keywords
- resistance
- artificial line
- diagonal
- shunted
- derived
- 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
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/14—Two-way operation using the same type of signal, i.e. duplex
- H04L5/1407—Artificial lines or their setting
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Computer Networks & Wireless Communication (AREA)
- Arrangements For Transmission Of Measured Signals (AREA)
- Measurement Of Resistance Or Impedance (AREA)
Abstract
457,776. Two-way transmission. GIULI, I. DE, OSTI, A. L., SANNIO, L., and TOMELLINI, L., 46, Via Calabria, Rome. June 4, 1935, No. 16119. Convention date, June 2, 1934. [Class 40 (iv)] [See also Group XL] In duplex telephony or duplex A.C. or D.C. telegraphy employing a Wheatstone bridge, the artificial line does not match the natural line, and the mismatch is compensated by combining in the receiver the effects of voltages differing in phase and derived from a number of points in the artificial line. In this way the receiving diagonal is dissociated from the transmitting diagonal for all the Fourier components of a signal, Thus an artificial line b, comprising resistance and capacity only may be used with a cable I loaded with distributed inductance, and the unbalance currents in the receiving diagonal A are neutralized by means of currents derived from points D, E, F, of the artificial line through amplifiers M, N, P. These compensating currents are applied to separate coils in the relay Q in such a sense as to neutralize the current derived from the diagonal A. The resistance of each section of the artificial line is made proportional to the wave-length of the component to be collected from that section. The relay Q can be replaced, by means of a multipole switch, by a test set, Fig. 2 (not shown), so that the effects of the components can be observed separately and in combination. In practice the amplifier A comprises resistancecoupled valves fed through altering devices consisting of condensers and rejector circuits shunted by resistance and through a transformer primary of which is shunted by resistance and inductance while its secondary is shunted by resistance, Fig. 3 (not shown).
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| IT457776X | 1934-06-02 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB457776A true GB457776A (en) | 1936-12-04 |
Family
ID=11258154
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB16119/35A Expired GB457776A (en) | 1934-06-02 | 1935-06-04 | Improvements in or relating to the electrical transmission of telegraphic, telephonic or other signals |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB457776A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4052556A (en) * | 1974-11-14 | 1977-10-04 | Siemens Aktiengesellschaft | Circuit arrangement for balancing a two wire full duplex data transmission system |
-
1935
- 1935-06-04 GB GB16119/35A patent/GB457776A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4052556A (en) * | 1974-11-14 | 1977-10-04 | Siemens Aktiengesellschaft | Circuit arrangement for balancing a two wire full duplex data transmission system |
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