GB528152A - Transmission of frequency modulated valves - Google Patents
Transmission of frequency modulated valvesInfo
- Publication number
- GB528152A GB528152A GB12788/39A GB1278839A GB528152A GB 528152 A GB528152 A GB 528152A GB 12788/39 A GB12788/39 A GB 12788/39A GB 1278839 A GB1278839 A GB 1278839A GB 528152 A GB528152 A GB 528152A
- Authority
- GB
- United Kingdom
- Prior art keywords
- frequency
- quadrature
- phase
- circuit
- coil
- 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
- 230000005540 biological transmission Effects 0.000 title 1
- 238000004804 winding Methods 0.000 abstract 3
- 230000010355 oscillation Effects 0.000 abstract 2
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03C—MODULATION
- H03C3/00—Angle modulation
- H03C3/02—Details
- H03C3/06—Means for changing frequency deviation
Landscapes
- Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
- Noise Elimination (AREA)
Abstract
528,152. Frequency modulation. STANDARD TELEPHONES & CABLES, Ltd. April 28, 1939, No. 12788. Convention date, May 21, 1938. [Class 40 (v)'] Frequency-modulated signals are received by combining them with locally-generated waves in phase-quadrature, and thereafter utilizing any component resulting from lack of frequency and phase-quadrature agreement to maintain the phase-quadrature relation, and at the same time to produce a demodulated current. Incoming signals are fed from a transformer 5 to balanced detectors 7, 8. The parallel input winding 9 is coupled to the output circuit of a variablefrequency oscillator 12, the back-coupled grid circuit of which includes a winding 14, with a magnetic core, and a control winding 16. The latter is in series with a coil 20 which is coupled to a network 19, tuned to the carrier-frequency and shunted across the signal input. Normally the oscillator 12 supplies a carrier-frequency oscillation to the coil 9 in phase-quadrature with the signals. This leaves the series coils 16, 20 unaffected. The arrival of a frequency-modulated signal, however, increases the spac:e-current say through detector 7, at the expense of detector 8, and so produces a control voltage across the resistances 22, 23. This alters the biasing current through the coil 16 and causes the tuning of the circuit 13 to keep in step with the changing frequency of the incoming signals, thus automatically maintaining the locally-generated oscillations in the required phase-quadrature. At the same time, voltages corresponding with the original signal appear across the series resistance 26. The band-pass action of the circuit 19 also automatically keeps in step with the shifting frequency of the incoming signals.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US209183A US2259000A (en) | 1938-05-21 | 1938-05-21 | Transmission of frequency modulated waves |
Publications (1)
Publication Number | Publication Date |
---|---|
GB528152A true GB528152A (en) | 1940-10-23 |
Family
ID=22777706
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB12788/39A Expired GB528152A (en) | 1938-05-21 | 1939-04-28 | Transmission of frequency modulated valves |
Country Status (5)
Country | Link |
---|---|
US (1) | US2259000A (en) |
CH (1) | CH234266A (en) |
FR (1) | FR854976A (en) |
GB (1) | GB528152A (en) |
NL (1) | NL61925C (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2989622A (en) * | 1958-12-29 | 1961-06-20 | Bell Telephone Labor Inc | Hybrid sideband frequency modulation system |
Families Citing this family (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2541066A (en) * | 1943-11-24 | 1951-02-13 | Sperry Corp | Object detecting and warning system and method |
US2488584A (en) * | 1943-12-08 | 1949-11-22 | Rca Corp | Locked-in oscillator circuits |
US2494795A (en) * | 1945-02-03 | 1950-01-17 | Philco Corp | Frequency-detector and frequency-control circuits |
US2510906A (en) * | 1945-03-24 | 1950-06-06 | Avco Mfg Corp | Frequency modulation receiver |
US2609494A (en) * | 1950-01-24 | 1952-09-02 | Padevco Inc | Frequency modulation system for receiving one of two overlapping waves |
US2983814A (en) * | 1956-02-01 | 1961-05-09 | Raytheon Co | Signal receivers |
NL128777C (en) * | 1958-08-14 | |||
DE1199337B (en) * | 1959-02-04 | 1965-08-26 | Peter G S Mero | Phase discriminator |
FR2938261B1 (en) | 2008-11-13 | 2010-11-19 | Arkema France | MANUFACTURE OF CARBOXYLIC ACID VINYL ETHYLENE / ESTER COPOLYMERS FROM RENEWABLE MATERIALS, COPOLYMERS OBTAINED AND USES THEREOF |
FR2939139B1 (en) | 2008-12-03 | 2012-12-21 | Arkema France | COMPOSITION COMPRISING POLYPROPYLENE AND / OR COPOLYMER OF PROPYLENE OBTAINED FROM RENEWABLE MATERIALS AND USES THEREOF |
-
1938
- 1938-05-21 US US209183A patent/US2259000A/en not_active Expired - Lifetime
-
1939
- 1939-04-28 GB GB12788/39A patent/GB528152A/en not_active Expired
- 1939-05-19 FR FR854976D patent/FR854976A/en not_active Expired
- 1939-05-22 CH CH234266D patent/CH234266A/en unknown
- 1939-05-22 NL NL93492A patent/NL61925C/xx active
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2989622A (en) * | 1958-12-29 | 1961-06-20 | Bell Telephone Labor Inc | Hybrid sideband frequency modulation system |
Also Published As
Publication number | Publication date |
---|---|
FR854976A (en) | 1940-04-29 |
NL61925C (en) | 1948-11-15 |
US2259000A (en) | 1941-10-14 |
CH234266A (en) | 1944-09-15 |
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