GB426227A - Improvements in or relating to radio signalling - Google Patents
Improvements in or relating to radio signallingInfo
- Publication number
- GB426227A GB426227A GB2435/34A GB243534A GB426227A GB 426227 A GB426227 A GB 426227A GB 2435/34 A GB2435/34 A GB 2435/34A GB 243534 A GB243534 A GB 243534A GB 426227 A GB426227 A GB 426227A
- Authority
- GB
- United Kingdom
- Prior art keywords
- signal
- frequency
- phase
- amplifier
- resistance
- 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
- H03—ELECTRONIC CIRCUITRY
- H03C—MODULATION
- H03C5/00—Amplitude modulation and angle modulation produced simultaneously or at will by the same modulating signal
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Transmitters (AREA)
- Noise Elimination (AREA)
- Circuits Of Receivers In General (AREA)
Abstract
426,227. Wireless signalling. ARMSTRONG, E. H., 211, Central Park West, New York, U.S.A. Jan. 24, 1934, No. 2435. Convention date, Jan. 24, 1933. [Class 40 (v)] Frequency or phase modulation is effected by aperiodic circuits, the phase shift of the carrier wave being directly proportional to the amplitude and inversely proportional to the frequency of the signal. The output from a constantfrequency oscillator 1, Fig. 1, is connected (a) through an amplifier 2 to a resistance 3, and (b) in parallel to two amplifiers 4, 5 coupled at 6 to the signal source 26, and at 9, 10 to an amplifier 12 which feeds back to the resistance 3 currents displaced in phase by the signal components. As shown in Fig. 3, A represents the signal voltage and B the corresponding plate voltages impressed on the valves 4, 5. The vector MN at C represents the voltage across the resistance 3 in the output of amplifier 2 when no signal component is present, whilst ON and NP represent the phase-shift over one cycle of signal current. The resulting phasemodulated carrier is fed through further amplifiers, filters, and current-limiters to the transmitting aerial. Since the time taken to shift the phase is inversely proportional to the frequency of modulation, a correction circuit 27, 28 is introduced at the signal input. This feeds to the transformer 6 a voltage which is inversely proportional to the signal frequency, thereby maintaining constant modulation for high notes and low. The initial small phaseshift may be increased, say for television, to any desired extent by frequency-multiplying, combined if necessary with heterodyning. Specifications 290,642, [Class 40 (v)], and 426,228 are referred to.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US653237A US1941069A (en) | 1933-01-24 | 1933-01-24 | Radiosignaling |
Publications (1)
Publication Number | Publication Date |
---|---|
GB426227A true GB426227A (en) | 1935-03-29 |
Family
ID=24620034
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB2436/34A Expired GB426228A (en) | 1933-01-24 | 1934-01-24 | Improvements in or relating to radio signalling |
GB2435/34A Expired GB426227A (en) | 1933-01-24 | 1934-01-24 | Improvements in or relating to radio signalling |
Family Applications Before (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB2436/34A Expired GB426228A (en) | 1933-01-24 | 1934-01-24 | Improvements in or relating to radio signalling |
Country Status (6)
Country | Link |
---|---|
US (1) | US1941069A (en) |
BE (1) | BE433916A (en) |
DE (1) | DE924809C (en) |
FR (1) | FR771091A (en) |
GB (2) | GB426228A (en) |
NL (1) | NL44760C (en) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB509820A (en) * | 1937-11-19 | 1939-07-19 | Edmond Maurice Deloraine | Improvements in or relating to electric signalling systems |
BE480549A (en) * | 1938-11-12 | |||
DE927749C (en) * | 1942-05-12 | 1955-05-16 | Studiengesellschaft Fuer Elekt | Circuit arrangement for limiting the amplitude |
DE972138C (en) * | 1943-12-31 | 1959-05-27 | Funkstrahl Ges Fuer Nachrichte | Arrangement for limiting the amplitude of alternating voltages, in particular of frequency-modulated oscillations |
DE1277375B (en) * | 1964-11-06 | 1968-09-12 | Te Ka De Fernmeldeapp G M B H | Method for frequency modulation of relatively low carrier frequencies, especially in the km wave range |
Family Cites Families (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE361387C (en) * | 1920-02-28 | 1922-10-13 | Marconi Wireless Telegraph Co | Wireless telephony transmitter |
DE424239C (en) * | 1920-08-31 | 1926-01-22 | Siemens & Halske Akt Ges | Method for wireless high frequency telephony |
US1599586A (en) * | 1922-04-27 | 1926-09-14 | John Hays Hammond Jr | Radiant signaling system |
US1885826A (en) * | 1926-12-08 | 1932-11-01 | American Telephone & Telegraph | System of photography employing frequency modulation |
US1941447A (en) * | 1927-05-18 | 1933-12-26 | Edwin H Armstrong | Radio telephone signaling |
GB290642A (en) * | 1927-05-18 | 1929-07-18 | Edwin Howard Armstrong | Improvements in radio telephone signalling |
US1819508A (en) * | 1927-08-11 | 1931-08-18 | Rca Corp | Communication by frequency variation |
US1872364A (en) * | 1927-10-08 | 1932-08-16 | Westinghouse Electric & Mfg Co | Radiotransmitting system |
US1867567A (en) * | 1929-02-01 | 1932-07-19 | Rca Corp | Detection of frequency modulated signals |
US1917102A (en) * | 1929-07-22 | 1933-07-04 | Gen Electric | Frequency modulation |
-
0
- BE BE433916D patent/BE433916A/xx unknown
- NL NL44760D patent/NL44760C/xx active
-
1933
- 1933-01-24 US US653237A patent/US1941069A/en not_active Expired - Lifetime
-
1934
- 1934-01-24 FR FR771091D patent/FR771091A/en not_active Expired
- 1934-01-24 GB GB2436/34A patent/GB426228A/en not_active Expired
- 1934-01-24 GB GB2435/34A patent/GB426227A/en not_active Expired
- 1934-01-25 DE DEA2624D patent/DE924809C/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
BE433916A (en) | |
DE924809C (en) | 1955-03-07 |
FR771091A (en) | 1934-09-29 |
NL44760C (en) | 1900-01-01 |
GB426228A (en) | 1935-03-29 |
US1941069A (en) | 1933-12-26 |
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