GB621694A - Improvements in or relating to frequency discriminator circuit arrangements - Google Patents
Improvements in or relating to frequency discriminator circuit arrangementsInfo
- Publication number
- GB621694A GB621694A GB20973/46A GB2097346A GB621694A GB 621694 A GB621694 A GB 621694A GB 20973/46 A GB20973/46 A GB 20973/46A GB 2097346 A GB2097346 A GB 2097346A GB 621694 A GB621694 A GB 621694A
- Authority
- GB
- United Kingdom
- Prior art keywords
- frequency
- reactance
- rectifier
- crystal
- condenser
- 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
- 239000013078 crystal Substances 0.000 abstract 3
- 239000003990 capacitor Substances 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
- H03D3/16—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 electromechanical resonators
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03J—TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
- H03J7/00—Automatic frequency control; Automatic scanning over a band of frequencies
- H03J7/02—Automatic frequency control
- H03J7/04—Automatic frequency control where the frequency control is accomplished by varying the electrical characteristics of a non-mechanically adjustable element or where the nature of the frequency controlling element is not significant
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Rectifiers (AREA)
- Filters And Equalizers (AREA)
Abstract
621,694. Frequency modulation; automatic tuning correction. MARCONI'S WIRELESS TELEGRAPH CO., Ltd., and EASTER, B. July 12, 1946, No. 20973. [Class 40 (v)] A frequency discriminator for frequency modulation receivers or automatic frequency control comprises a pair of rectifiers D1, D2 with associated load impedances R1, R2 arranged so that the rectifier outputs are in mutual opposition, a divided input circuit L2, C2 connected or coupled between the rectifier circuits broadly resonant at the datum frequency, a piezo-electric crystal PC associated with one rectifier circuit and having its selfcapacitance balanced by a capacitor CN associated with the other rectifier and a reactance resonating with the crystal at the datum frequency and inserted in a common part of the rectifier circuit. The current through the series resonant crystal and reactance combination produces across the reactance the quadrature voltage required for the discriminator to operate. The reactance is preferably a condenser in which case the load resistors are connected to the input circuit side of the condenser to preserve the D.C. path (Fig. 2, not shown).
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB265357X | 1946-07-12 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB621694A true GB621694A (en) | 1949-04-14 |
Family
ID=10245170
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB20973/46A Expired GB621694A (en) | 1946-07-12 | 1946-07-12 | Improvements in or relating to frequency discriminator circuit arrangements |
Country Status (4)
| Country | Link |
|---|---|
| CH (1) | CH265357A (en) |
| DE (1) | DE841609C (en) |
| FR (1) | FR951695A (en) |
| GB (1) | GB621694A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2712600A (en) * | 1950-12-18 | 1955-07-05 | Gen Electric | Frequency response circuits |
| US2913580A (en) * | 1956-08-17 | 1959-11-17 | Hermes Electronics Co | Crystal discriminator network |
-
1946
- 1946-07-12 GB GB20973/46A patent/GB621694A/en not_active Expired
-
1947
- 1947-06-09 CH CH265357D patent/CH265357A/en unknown
- 1947-08-07 FR FR951695D patent/FR951695A/en not_active Expired
-
1949
- 1949-01-01 DE DEP30038D patent/DE841609C/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2712600A (en) * | 1950-12-18 | 1955-07-05 | Gen Electric | Frequency response circuits |
| US2913580A (en) * | 1956-08-17 | 1959-11-17 | Hermes Electronics Co | Crystal discriminator network |
Also Published As
| Publication number | Publication date |
|---|---|
| FR951695A (en) | 1949-11-02 |
| DE841609C (en) | 1952-06-16 |
| CH265357A (en) | 1949-11-30 |
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