GB632374A - Improvements in discriminators and detector circuits for angle-modulated waves - Google Patents
Improvements in discriminators and detector circuits for angle-modulated wavesInfo
- Publication number
- GB632374A GB632374A GB26788/46A GB2678846A GB632374A GB 632374 A GB632374 A GB 632374A GB 26788/46 A GB26788/46 A GB 26788/46A GB 2678846 A GB2678846 A GB 2678846A GB 632374 A GB632374 A GB 632374A
- Authority
- GB
- United Kingdom
- Prior art keywords
- frequency
- reactances
- condenser
- discriminator
- circuits
- 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
- 230000000903 blocking effect Effects 0.000 abstract 1
- 230000001939 inductive effect Effects 0.000 abstract 1
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03D—DEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER
- H03D3/00—Demodulation of angle-, frequency- or phase- modulated oscillations
- H03D3/02—Demodulation of angle-, frequency- or phase- modulated oscillations by detecting phase difference between two signals obtained from input signal
- H03D3/06—Demodulation of angle-, frequency- or phase- modulated oscillations by detecting phase difference between two signals obtained from input signal by combining signals additively or in product demodulators
- H03D3/08—Demodulation of angle-, frequency- or phase- modulated oscillations by detecting phase difference between two signals obtained from input signal by combining signals additively or in product demodulators by means of diodes, e.g. Foster-Seeley discriminator
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Transmitters (AREA)
Abstract
632,374. Frequency and phase modulation. MARCONI'S WIRELESS TELEGRAPH CO., Ltd. Sept. 6, 1946, No. 26788. Convention date, Sept. 6, 1945. [Class 40 (v)] A discriminator-detector circuit for anglemodulated waves comprises a pair of series circuits 15, 14 and 16, 17 in parallel from the unlike but equal reactances 14, 17 of which at the carrier unmodulated frequency, a pair of rectifiers 20, 21 are fed developing variable opposed voltages across load resistances 30, 31, depending on the variation of the reactances with frequency. The circuits 15, 14 and 16, 17 may be series resonant at the unmodul.ated carrier frequency or, if not, the reactances 15, 16 and 14, 17 are made approximately equal to form a resonant tank circuit 8 tunable by one condenser 16, to which the other condenser 14 is ganged to maintain the output reactances 14, 17, equal at the unmodulated frequency. Alternatively the circuits 15, 14 and 16, 17 may each be series resonant at slightly different frequencies on opposite sides of the centre frequency. The inputs to the diodes are applied by way of condensers 23, 25 and vary in accordance with variation of the reactances 14, 17 with frequency. The input valve 1 may be an amplifier and/or limiter, feeding the discriminator by way of a D.C. blocking condenser 19 or, Fig. 2 (not shown), the tank circuit 8 may be atÀhigh D.C. potential and connected to earth by a condenser, a parallel resistance providing a non-inductive lead to the limiter valve anode and broadening the discriminator timing. With phase-modulated waves a de-emphasis correcting network follows the detector.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US632374XA | 1945-09-06 | 1945-09-06 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB632374A true GB632374A (en) | 1949-11-28 |
Family
ID=22047889
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB26788/46A Expired GB632374A (en) | 1945-09-06 | 1946-09-06 | Improvements in discriminators and detector circuits for angle-modulated waves |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB632374A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2671851A (en) * | 1952-02-07 | 1954-03-09 | Gen Precision Lab Inc | Monocyclic square discriminator |
-
1946
- 1946-09-06 GB GB26788/46A patent/GB632374A/en not_active Expired
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2671851A (en) * | 1952-02-07 | 1954-03-09 | Gen Precision Lab Inc | Monocyclic square discriminator |
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