GB569260A - Frequency modulation reproducing systems - Google Patents
Frequency modulation reproducing systemsInfo
- Publication number
- GB569260A GB569260A GB11267/43A GB1126743A GB569260A GB 569260 A GB569260 A GB 569260A GB 11267/43 A GB11267/43 A GB 11267/43A GB 1126743 A GB1126743 A GB 1126743A GB 569260 A GB569260 A GB 569260A
- Authority
- GB
- United Kingdom
- Prior art keywords
- frequency
- tube
- discriminator
- gramophone
- modulation
- 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
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B14/00—Transmission systems not characterised by the medium used for transmission
- H04B14/002—Transmission systems not characterised by the medium used for transmission characterised by the use of a carrier modulation
- H04B14/006—Angle modulation
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R19/00—Electrostatic transducers
- H04R19/04—Microphones
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Computer Networks & Wireless Communication (AREA)
- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Inductance-Capacitance Distribution Constants And Capacitance-Resistance Oscillators (AREA)
- Transmitters (AREA)
Abstract
569,260. Gramophone reproducing circuits. RADIO CORPORATION OF AMERICA. July 12, 1943, No. 11267. Convention date, Sept. 23, 1942, [Class 40 (iv)] [Also in Group XL] In a gramophone reproducing or other system in which movements are translated into currents of the kind in which such movements effect frequency or phase-modulation of a current of higher frequency, modulation is effected in a multi -electrode tube with an oscillation-generating section having electron coupling with the output electrode. This tube is followed by a discriminator in the form of a circuit tuned to a frequency slightly different from the mean frequency of the oscillator, and a diode-triode tube for rectifying and amplifying the output of the discriminator circuit. All these elements may be mounted in the tone arm as shown in Fig. 3. In a modification, Fig. 5, only the frequency-modulating circuits are in the tone arm and the frequency-modulated oscillators are taken by a low impedance transmission line to a discriminator 40 associated with a diode-triode tube 22. In this case the leads from the pick-up pass through damping boxes.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US459375A US2481886A (en) | 1942-09-23 | 1942-09-23 | Frequency modulation reproducing system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB569260A true GB569260A (en) | 1945-05-15 |
Family
ID=23824522
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB11267/43A Expired GB569260A (en) | 1942-09-23 | 1943-07-12 | Frequency modulation reproducing systems |
Country Status (2)
| Country | Link |
|---|---|
| US (1) | US2481886A (en) |
| GB (1) | GB569260A (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2682579A (en) * | 1951-08-13 | 1954-06-29 | Weathers Paul | High-frequency modulated oscillator transducer system |
| US2754372A (en) * | 1952-01-17 | 1956-07-10 | Weathers Paul | Variable capacity phonograph-record pickup unit |
| US2843679A (en) * | 1953-08-31 | 1958-07-15 | Ephraim W Hogue | Capacity-type transducer |
| US2866856A (en) * | 1954-02-15 | 1958-12-30 | Weathers Paul | Controlled oscillator systems |
| US2907835A (en) * | 1954-08-13 | 1959-10-06 | Kalmus Henry Paul | Capacitive transducer |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE315498C (en) * | 1918-04-19 | |||
| GB373973A (en) * | 1929-12-07 | 1932-06-02 | Dubilier Condenser Co 1925 Ltd | Improvements in photograph pick-up arrangements |
| US2008690A (en) * | 1932-07-01 | 1935-07-23 | Rca Corp | Oscillator system |
| US2208091A (en) * | 1936-06-10 | 1940-07-16 | Radio Patents Corp | Frequency variation response circuit |
| US2230231A (en) * | 1936-10-24 | 1941-02-04 | Rca Corp | Phase and frequency modulation |
| US2241569A (en) * | 1939-05-06 | 1941-05-13 | Radio Patents Corp | Variable frequency response circuit |
| US2304633A (en) * | 1940-02-15 | 1942-12-08 | Farnsworth Television & Radio | Electric recording and reproducing system |
| US2368052A (en) * | 1941-04-29 | 1945-01-23 | Patents Res Corp | Electric translating system |
-
1942
- 1942-09-23 US US459375A patent/US2481886A/en not_active Expired - Lifetime
-
1943
- 1943-07-12 GB GB11267/43A patent/GB569260A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| US2481886A (en) | 1949-09-13 |
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