GB480444A - Improvements in or relating to electric signalling systems - Google Patents
Improvements in or relating to electric signalling systemsInfo
- Publication number
- GB480444A GB480444A GB2322536A GB2322536A GB480444A GB 480444 A GB480444 A GB 480444A GB 2322536 A GB2322536 A GB 2322536A GB 2322536 A GB2322536 A GB 2322536A GB 480444 A GB480444 A GB 480444A
- Authority
- GB
- United Kingdom
- Prior art keywords
- output
- input
- filters
- impedance
- pass
- 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
- H03—ELECTRONIC CIRCUITRY
- H03C—MODULATION
- H03C1/00—Amplitude modulation
- H03C1/52—Modulators in which carrier or one sideband is wholly or partially suppressed
- H03C1/54—Balanced modulators, e.g. bridge type, ring type or double balanced type
- H03C1/56—Balanced modulators, e.g. bridge type, ring type or double balanced type comprising variable two-pole elements only
- H03C1/58—Balanced modulators, e.g. bridge type, ring type or double balanced type comprising variable two-pole elements only comprising diodes
Landscapes
- Amplitude Modulation (AREA)
Abstract
480,444. Modulating systems ; impedance networks. GENERAL ELECTRIC CO., Ltd., and LEY, D. A. Aug. 24, 1936, No. 23225. [Classes 40 (iii) and 40 (v)] In modulating and demodulating arrangements in which the input and output frequency bands are close together, the necessary provision for the avoidance of distortion, that the combined impedance of the input and output circuits as seen from the modulator or demodulator shall be constant over a substantial part of their combined pass ranges, is achieved by the use of two filters which are made complementary by means of suitable fractional terminations. Figs. 1 and 2 show a modulator C having input and output filters A, B, the input and output terminals of the modulator being the same in Fig. 1. The cut-off frequencies of the two filters are adjacent, and they are designed as complementary low and high-pass filters having fractional terminations 7, 8. Fig. 3 shows a demodulator C of which the input circuit includes a valve 6, which is of constant impedance as seen from the demodulator. The low-pass output filter B is provided with a complementary high-pass filter D in parallel, both having fractional terminations 7, 8 in order to render the output impedance constant over the working range.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2322536A GB480444A (en) | 1936-08-24 | 1936-08-24 | Improvements in or relating to electric signalling systems |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2322536A GB480444A (en) | 1936-08-24 | 1936-08-24 | Improvements in or relating to electric signalling systems |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB480444A true GB480444A (en) | 1938-02-23 |
Family
ID=10192174
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB2322536A Expired GB480444A (en) | 1936-08-24 | 1936-08-24 | Improvements in or relating to electric signalling systems |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB480444A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2606286A (en) * | 1948-12-08 | 1952-08-05 | Rca Corp | Interference reducing system |
-
1936
- 1936-08-24 GB GB2322536A patent/GB480444A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2606286A (en) * | 1948-12-08 | 1952-08-05 | Rca Corp | Interference reducing system |
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