GB548968A - Improvements in or relating to signal transmission circuit arrangements - Google Patents
Improvements in or relating to signal transmission circuit arrangementsInfo
- Publication number
- GB548968A GB548968A GB2717/41A GB271741A GB548968A GB 548968 A GB548968 A GB 548968A GB 2717/41 A GB2717/41 A GB 2717/41A GB 271741 A GB271741 A GB 271741A GB 548968 A GB548968 A GB 548968A
- Authority
- GB
- United Kingdom
- Prior art keywords
- circuit
- frequency
- frequencies
- transmission circuit
- band
- 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
- 230000008054 signal transmission Effects 0.000 title 1
- 230000005540 biological transmission Effects 0.000 abstract 3
- 230000004048 modification Effects 0.000 abstract 1
- 238000012986 modification Methods 0.000 abstract 1
- 238000000926 separation method Methods 0.000 abstract 1
- 230000001629 suppression Effects 0.000 abstract 1
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
- H03F1/42—Modifications of amplifiers to extend the bandwidth
- H03F1/48—Modifications of amplifiers to extend the bandwidth of aperiodic amplifiers
- H03F1/50—Modifications of amplifiers to extend the bandwidth of aperiodic amplifiers with tubes only
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
- H03F3/38—DC amplifiers with modulator at input and demodulator at output; Modulators or demodulators specially adapted for use in such amplifiers
- H03F3/40—DC amplifiers with modulator at input and demodulator at output; Modulators or demodulators specially adapted for use in such amplifiers with tubes only
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03G—CONTROL OF AMPLIFICATION
- H03G5/00—Tone control or bandwidth control in amplifiers
- H03G5/02—Manually-operated control
- H03G5/04—Manually-operated control in untuned amplifiers
- H03G5/06—Manually-operated control in untuned amplifiers having discharge tubes
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Amplifiers (AREA)
- Transmitters (AREA)
Abstract
548,968. Transmission systems. MARCONI'S WIRELESS TELEGRAPH CO., Ltd. Feb. 28, 1941, No. 2717. Convention date, Feb. 29, 1940. [Class 40 (iv)] In an arrangement for separating the lower frequencies (say 0-400) from the upper frequencies (say 400-10,000) in a transmission circuit 7, 8, a rough separation is effected by low and high-pass filters constituted by resistance/condensers combinations 11, 12 and13, 14 and the currents in the low-frequency circuit 5 modulate a carrier of a frequency higher than any in the transmission circuit and are then filtered to remove side-band components corresponding to the frequencies of the other channel and rectified. A voltage derived from the rectified currents is then applied by way of a filter similar to filters 13, 14 to a second grid 39 of a tube 40 in the high-frequency channel to balance out the lowfrequency components that were not stopped by the circuits 13, 14. In a modification, the equivalent of a bandpass filter cutting off at 50 and 60 cycles is obtained by the provision of two circuits like the circuit 5 the outputs of which have ranges of 0-50 and 0-60 cycles. These outputs are fed in opposition to the final circuit. By feeding this combined output in a suitable direction to another circuit from which the original ranges were derived, a band suppression effect may be obtained. Preferably the high-frequency band-pass filter is tunable.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US321562A US2255642A (en) | 1940-02-29 | 1940-02-29 | Multiple channel signal transmission system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB548968A true GB548968A (en) | 1942-11-02 |
Family
ID=23251109
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB2717/41A Expired GB548968A (en) | 1940-02-29 | 1941-02-28 | Improvements in or relating to signal transmission circuit arrangements |
Country Status (2)
| Country | Link |
|---|---|
| US (1) | US2255642A (en) |
| GB (1) | GB548968A (en) |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2534627A (en) * | 1946-05-22 | 1950-12-19 | Rca Corp | Video amplifier with separate channels for high and low frequencies |
| US2627549A (en) * | 1950-08-18 | 1953-02-03 | Rca Corp | Band width reducing system and method |
| US2771518A (en) * | 1953-03-27 | 1956-11-20 | Rca Corp | Frequency band separation amplifier system |
| BE527208A (en) * | 1953-03-28 | |||
| US2840646A (en) * | 1954-07-26 | 1958-06-24 | Cons Electrodynamics Corp | Two-channel d. c. amplifiers |
| US2760011A (en) * | 1954-10-25 | 1956-08-21 | Cons Electrodynamics Corp | Frequency separating apparatus |
| US3079568A (en) * | 1959-02-09 | 1963-02-26 | Acf Ind Inc | Broad band amplifier |
| US3168705A (en) * | 1962-08-01 | 1965-02-02 | Okamura Shiro | Signal delaying apparatus |
| US4363009A (en) * | 1980-05-08 | 1982-12-07 | Wavetek Indiana, Inc. | L-C Filter with impedance transformers |
-
1940
- 1940-02-29 US US321562A patent/US2255642A/en not_active Expired - Lifetime
-
1941
- 1941-02-28 GB GB2717/41A patent/GB548968A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| US2255642A (en) | 1941-09-09 |
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