GB495815A - Improvements in or relating to electric signal transmission systems - Google Patents
Improvements in or relating to electric signal transmission systemsInfo
- Publication number
- GB495815A GB495815A GB3186537A GB3186537A GB495815A GB 495815 A GB495815 A GB 495815A GB 3186537 A GB3186537 A GB 3186537A GB 3186537 A GB3186537 A GB 3186537A GB 495815 A GB495815 A GB 495815A
- Authority
- GB
- United Kingdom
- Prior art keywords
- section
- cable
- phase
- loss
- displacement
- 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
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N7/00—Television systems
- H04N7/10—Adaptations for transmission by electrical cable
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J43/00—Secondary-emission tubes; Electron-multiplier tubes
- H01J43/04—Electron multipliers
- H01J43/06—Electrode arrangements
- H01J43/18—Electrode arrangements using essentially more than one dynode
- H01J43/20—Dynodes consisting of sheet material, e.g. plane, bent
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B3/00—Line transmission systems
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B3/00—Line transmission systems
- H04B3/02—Details
- H04B3/04—Control of transmission; Equalising
- H04B3/14—Control of transmission; Equalising characterised by the equalising network used
- H04B3/141—Control of transmission; Equalising characterised by the equalising network used using multiequalisers, e.g. bump, cosine, Bode
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Computer Networks & Wireless Communication (AREA)
- Multimedia (AREA)
- Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
- Communication Cables (AREA)
Abstract
495,815. Loading. COLLARD, J., and MANIFOLD, M. BOWMAN-. Feb. 18, 1937, Nos. 31865/37 (divided out of 476,799, [Group XL]), and 464/38. [Class 40 (iv)] [Also in Group XL] Relates to networks for either correcting or imitating, over a wide band of frequencies in television and like transmission systems, distortion of amplitude and phase due to variation with frequency of the resistance and inductance of a cable or other transmission line, or of its capacity and leakance, or of all four of these quantities. For each section of the equalizer an individual reference frequency p is assigned ; it is the frequency at which the transmission loss due to that section is a specified fraction of the maximum value of such loss, and in an example is the frequency at which the reactance and resistance of each arm of the section in question are equal. According to the invention the values p of the reference frequencies for successive sections are so spaced that the transmission loss or phase delay or both at the reference frequencies increase by equal increments from section to section. The equalizers may be located at the end of a cable or may be distributed as loading at intervals short compared with the wave-lengths employed. The invention is applicable to any cable or other transmission line in which the loss is represented by #An#<n> and the phase-displacement by #An#<n>tan¢# where the pulsatance #<1. The Specification gives a mathematical analysis showing that if the loss due to the cable is F(#) and if the reference frequencies p1, P2 ... are chosen so that the quantities F(pn) are spaced at equal intervals x, while the nth section of the equalizer causes a loss of f(qn), where qn=pn/#, then the equalizers cause a total loss equal to that caused by the cable if F(#) is of the form A#n; it is found, moreover, that in this case the phase-displacement ##(qn) is proportional to #<n>tan¢n#. The theory is then applied to the particular case of constant-resistance sections, for instance those shown in Fig. 4, where L/C = R1 R2=Z0<SP>2>, Z0 being the characteristic impedance. A series of such sections can be made to represent a cable. The Specification shows that the required conditions can be satisfied by means of arms built up of reactances in series or parallel with resistances, the propagation constant k of the resulting ladder section being given by the logarithm of IIsr(q+jt)/IIgr (q +ja,) where the s, t, g and a are constants. When the values of the constants for a network giving the same attenuation and phase-displacement as the cable have been found, interchange of the constants tr and ar leads to the design of a correcting network which yields attenuation and phase-displacement that compensate those yielded by the cable. It is shown that if n < 1 the spacing interval x is finite and that for every term An#<n> in the attenuation characteristic there is a corresponding term An#<n>tan¢n# in the phase characteristic. A more powerfully attenuating section may have the form shown in Fig. 5, or a tee-section, Fig. 6, may be adopted. A chain of attenuators having different spacing factors x may be used provided that these factors satisfy a condition given in the Specification. The invention may be applied to correct the distortion in speaking-tubes, or in delay devices in which mechanical waves are transmitted through a fluid, the acoustic vibrations being first converted into their electrical equivalents. Specification 476,799 is referred to.
Priority Applications (10)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB6483/36A GB476799A (en) | 1936-03-03 | 1936-03-03 | Improvements in or relating to electric signal transmission systems |
US127924A US2158978A (en) | 1936-03-03 | 1937-02-26 | Electric signal transmission system |
FR818700D FR818700A (en) | 1936-03-03 | 1937-03-03 | Improvements to electrical transmission systems |
US190832A US2165838A (en) | 1936-03-03 | 1938-02-16 | Electric signal transmission system |
FR833987D FR833987A (en) | 1936-03-03 | 1938-02-18 | Improvements to oscillation transmission systems |
GB4439/39A GB524908A (en) | 1936-03-03 | 1939-02-10 | Improvements in or relating to wave transmission systems |
GB10280/40A GB541882A (en) | 1936-03-03 | 1940-06-13 | Improvements in or relating to wave transmission systems |
FR54937D FR54937E (en) | 1936-03-03 | 1946-08-26 | Improvements to oscillation transmission systems |
FR55162D FR55162E (en) | 1936-03-03 | 1946-08-26 | Improvements to oscillation transmission systems |
FR57145D FR57145E (en) | 1936-03-03 | 1946-08-26 | Improvements to oscillation transmission systems |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB443839A GB524907A (en) | 1939-02-10 | 1939-02-10 | Improvements in or relating to wave transmission systems |
Publications (1)
Publication Number | Publication Date |
---|---|
GB495815A true GB495815A (en) | 1938-11-18 |
Family
ID=9777178
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB3186537A Expired GB495815A (en) | 1936-03-03 | 1937-02-18 | Improvements in or relating to electric signal transmission systems |
GB443839A Expired GB524907A (en) | 1936-03-03 | 1939-02-10 | Improvements in or relating to wave transmission systems |
Family Applications After (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB443839A Expired GB524907A (en) | 1936-03-03 | 1939-02-10 | Improvements in or relating to wave transmission systems |
Country Status (1)
Country | Link |
---|---|
GB (2) | GB495815A (en) |
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1228683B (en) * | 1961-09-08 | 1966-11-17 | Siemens Ag | Arrangement for very short electromagnetic waves to compensate for the delay time distortions of hollow lines |
GB2210759A (en) * | 1987-10-05 | 1989-06-14 | Gen Electric | High frequency signal equalising |
GB2211054A (en) * | 1987-10-05 | 1989-06-21 | Gen Electric | High frequency signal equalising |
US5144267A (en) * | 1989-12-06 | 1992-09-01 | Scientific-Atlanta, Inc. | Variable slope network for off-premises CATV system |
US5231660A (en) * | 1988-03-10 | 1993-07-27 | Scientific-Atlanta, Inc. | Compensation control for off-premises CATV system |
US5345504A (en) * | 1988-03-10 | 1994-09-06 | Scientific-Atlanta, Inc. | Differential compensation control for off-premises CATV system |
WO2009131501A1 (en) * | 2008-04-23 | 2009-10-29 | Telefonaktiebolaget L M Ericsson (Publ) | Method for transmission line analysis |
CN106027435A (en) * | 2016-07-29 | 2016-10-12 | 成都四威功率电子科技有限公司 | Adjustable equalizer |
-
1937
- 1937-02-18 GB GB3186537A patent/GB495815A/en not_active Expired
-
1939
- 1939-02-10 GB GB443839A patent/GB524907A/en not_active Expired
Cited By (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1228683B (en) * | 1961-09-08 | 1966-11-17 | Siemens Ag | Arrangement for very short electromagnetic waves to compensate for the delay time distortions of hollow lines |
GB2210759A (en) * | 1987-10-05 | 1989-06-14 | Gen Electric | High frequency signal equalising |
GB2211054A (en) * | 1987-10-05 | 1989-06-21 | Gen Electric | High frequency signal equalising |
US4849981A (en) * | 1987-10-05 | 1989-07-18 | General Electric Company | High frequency signal driver for a laser diode and method of forming same |
GB2210759B (en) * | 1987-10-05 | 1992-04-22 | Gen Electric | High frequency signalling apparatus and method |
GB2211054B (en) * | 1987-10-05 | 1992-04-29 | Gen Electric | High frequency signal driving |
US5231660A (en) * | 1988-03-10 | 1993-07-27 | Scientific-Atlanta, Inc. | Compensation control for off-premises CATV system |
US5345504A (en) * | 1988-03-10 | 1994-09-06 | Scientific-Atlanta, Inc. | Differential compensation control for off-premises CATV system |
US5144267A (en) * | 1989-12-06 | 1992-09-01 | Scientific-Atlanta, Inc. | Variable slope network for off-premises CATV system |
WO2009131501A1 (en) * | 2008-04-23 | 2009-10-29 | Telefonaktiebolaget L M Ericsson (Publ) | Method for transmission line analysis |
US8428224B2 (en) | 2008-04-23 | 2013-04-23 | Telefonaktiebolaget L M Ericsson (Publ) | Method for transmission line analysis |
CN106027435A (en) * | 2016-07-29 | 2016-10-12 | 成都四威功率电子科技有限公司 | Adjustable equalizer |
Also Published As
Publication number | Publication date |
---|---|
GB524907A (en) | 1940-08-16 |
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