GB596519A - Improvements in detector circuits for angle-modulated oscillations - Google Patents
Improvements in detector circuits for angle-modulated oscillationsInfo
- Publication number
- GB596519A GB596519A GB19347/45A GB1934745A GB596519A GB 596519 A GB596519 A GB 596519A GB 19347/45 A GB19347/45 A GB 19347/45A GB 1934745 A GB1934745 A GB 1934745A GB 596519 A GB596519 A GB 596519A
- Authority
- GB
- United Kingdom
- Prior art keywords
- frequency
- input circuit
- condenser
- centre frequency
- coils
- 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
- 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
Abstract
596,519. Frequency modulation. MARCONI'S WIRELESS TELEGRAPH CO., Ltd. July 28, 1945, No. 19347. Convention date, July 28, 1944. [Class 40 (v)] A detector for angle modulated oscillations comprises two series resonant circuits, oppositely mistuned with respect to a centre frequency, arranged so that the inductances have a common terminal, and the condensers have a common terminal coupled through a low impedance to an input circuit tuned to the centre frequency, means for rectifying the voltages developed across the inductances and differentially combining the rectified voltages. As shown in Fig. 1, series resonant circuits C1, L1 and C2, L2 are mistuned on opposite sides of the frequency to which the input circuit 6, fed from a limiter 1, is tuned. The common terminal of condensers C1, C2 is coupled through a low impedance condenser C3 to a low potential point on the input circuit. The junction of coils L1, L2 is connected to earth through byepass condenser 9<1>, while the voltages appearing across coils L1, L2 are rectified by diodes 10, 11 respectively, and an audio output taken off through chole 12. The capacity coupling C3 may be replaced by inductive coupling (Fig. 2, not shown). In a modification, Fig. 4, the coils L1, L2 are shunted by damping resistors R3, R4. In tuning this embodiment, the ganged condensers C1, C2 are adjusted to tune the series resonant circuits C1, L1 and C2, L2 to one side of the centre frequency, and the circuit C1, L1 is then tuned to the opposite side of the centre frequency by an auxiliary condenser C4. The discriminator may be fed through a concentric cable terminated by a resistance and connected to the input circuit through a blocking condenser (Fig. 6, not shown) or a coupling coil (Fig. 7, not shown). The discriminator may be used as a monitor for a frequency modulated transmission, when it is coupled to the output circuit of the transmitter. Specification 296,678, [Class 40 (v)], is referred to.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US546959A US2457013A (en) | 1944-07-28 | 1944-07-28 | Angle modulated wave discriminator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB596519A true GB596519A (en) | 1948-01-06 |
Family
ID=24182725
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB19347/45A Expired GB596519A (en) | 1944-07-28 | 1945-07-28 | Improvements in detector circuits for angle-modulated oscillations |
Country Status (2)
| Country | Link |
|---|---|
| US (1) | US2457013A (en) |
| GB (1) | GB596519A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1100722B (en) * | 1957-05-07 | 1961-03-02 | Philips Nv | Push-pull frequency demodulator |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2700103A (en) * | 1946-05-15 | 1955-01-18 | Selove Walter | Balanced-detector circuit |
| US2576249A (en) * | 1947-08-28 | 1951-11-27 | Bell Telephone Labor Inc | Level ratio measuring system |
| US2664505A (en) * | 1951-07-26 | 1953-12-29 | Bell Telephone Labor Inc | Frequency modulation detector |
| US2873367A (en) * | 1953-11-19 | 1959-02-10 | Rca Corp | Angle modulation detector |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2243417A (en) * | 1939-06-01 | 1941-05-27 | Rca Corp | Frequency modulation receiver |
| US2293501A (en) * | 1940-03-15 | 1942-08-18 | Rca Corp | Method of and means for reducing the effects of multipath phenomenon |
| US2334189A (en) * | 1940-06-05 | 1943-11-16 | Rca Corp | Relay system and associated circuits therefor |
| US2286378A (en) * | 1940-08-31 | 1942-06-16 | Rca Corp | Frequency modulated wave detector |
| US2312070A (en) * | 1940-12-07 | 1943-02-23 | Rca Corp | Frequency discriminator circuit |
| US2361625A (en) * | 1941-12-22 | 1944-10-31 | Rca Corp | Frequency and phase modulation receiver |
| US2351193A (en) * | 1942-06-13 | 1944-06-13 | Rca Corp | Frequency modulation detector circuit |
-
1944
- 1944-07-28 US US546959A patent/US2457013A/en not_active Expired - Lifetime
-
1945
- 1945-07-28 GB GB19347/45A patent/GB596519A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1100722B (en) * | 1957-05-07 | 1961-03-02 | Philips Nv | Push-pull frequency demodulator |
Also Published As
| Publication number | Publication date |
|---|---|
| US2457013A (en) | 1948-12-21 |
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