GB579117A - Improvements in or relating to means for increasing the signal to noise ratio in radio transmission systems - Google Patents
Improvements in or relating to means for increasing the signal to noise ratio in radio transmission systemsInfo
- Publication number
- GB579117A GB579117A GB16435/41A GB1643541A GB579117A GB 579117 A GB579117 A GB 579117A GB 16435/41 A GB16435/41 A GB 16435/41A GB 1643541 A GB1643541 A GB 1643541A GB 579117 A GB579117 A GB 579117A
- Authority
- GB
- United Kingdom
- Prior art keywords
- wave
- modulated
- carrier
- signal
- repetitive
- 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
- H03K—PULSE TECHNIQUE
- H03K9/00—Demodulating pulses which have been modulated with a continuously-variable signal
- H03K9/04—Demodulating pulses which have been modulated with a continuously-variable signal of position-modulated pulses
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K9/00—Demodulating pulses which have been modulated with a continuously-variable signal
- H03K9/06—Demodulating pulses which have been modulated with a continuously-variable signal of frequency- or rate-modulated pulses
Landscapes
- Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
- Amplitude Modulation (AREA)
- Radar Systems Or Details Thereof (AREA)
- Noise Elimination (AREA)
Abstract
579,117. Wireless receiving systems. STANDARD TELEPHONES & CABLES, Ltd., and EARP, C. W. Dec. 19, 1941, No. 16435. [Class 40 (v)] A system for the demodulation of a carrier wave of complex wave form repetitive at some predetermined period of time, the repetitive characteristic being modified by the intelligence bearing modulation, consists in dividing the modulated complex carrier wave along two paths having a difference in electrical length equal to the repetition period of the carrier wave or an exact multiple thereof, and combining the signals from the two paths in a balanced modulator or differential detector. Either or both of the paths may include a further modulator for combining the wave with a carrier -wave of constant frequency. The signal from 1, which comprises a series.of pulses which are modulated as regards amplitude, time or duration, is applied through channel A directly to one input of a differential detector D and indirectly by channel B to the second input. Channel B includes a delay network DN which introduces a time delay equal to the interval between the pulses. The output, taken from a low pass filter LF comprises the intelligence which is in the form of a modification of the pulse or repetitive part of the complex carrier. If either or both channels A, B contains a modulator for combining with a constant frequency wave (Fig. 2, not shown) the output consists of the intelligence modulated on to the constant frequency wave. In these arrangements, all components of the repetitive signal combine in the detector to give an output while noise being of random phase does not tend to combine to produce an output. The Specification describes the application of the system to the following types of signal :-modulated carrier and tone telegraph transmission, amplitude, duration and time modulated pulse transmissions, and modulation on a phase or frequency modulated carrier wave.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB272430X | 1941-12-19 | ||
GB8798/43A GB585827A (en) | 1941-12-19 | 1943-06-01 | Improvements in or relating to the demodulation of time-modulated electrical pulses |
Publications (1)
Publication Number | Publication Date |
---|---|
GB579117A true GB579117A (en) | 1946-07-24 |
Family
ID=32232364
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB16435/41A Expired GB579117A (en) | 1941-12-19 | 1941-12-19 | Improvements in or relating to means for increasing the signal to noise ratio in radio transmission systems |
Country Status (6)
Country | Link |
---|---|
US (2) | US2426187A (en) |
BE (2) | BE480687A (en) |
CH (1) | CH272430A (en) |
ES (1) | ES177443A1 (en) |
FR (2) | FR939281A (en) |
GB (1) | GB579117A (en) |
Families Citing this family (28)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2720592A (en) * | 1945-11-26 | 1955-10-11 | Howard L Schultz | Self-synchronization system |
US2677761A (en) * | 1945-11-26 | 1954-05-04 | Us Navy | Communication system |
US2605410A (en) * | 1946-08-27 | 1952-07-29 | Rca Corp | Pulse-time discriminator |
NL66481C (en) * | 1947-01-14 | |||
US2482782A (en) * | 1947-02-13 | 1949-09-27 | Jr George W Lenny | Pulse discrimination system |
US2761062A (en) * | 1947-12-09 | 1956-08-28 | Collins Radio Co | Carrier-sensing anti-noise receiving system |
US2580148A (en) * | 1947-12-09 | 1951-12-25 | Collins Radio Co | Antinoise carrier receiving system |
US2554112A (en) * | 1947-12-18 | 1951-05-22 | Libois Louis Joseph | Multiplex transmission system by means of electrical impulses |
US3087152A (en) * | 1948-07-01 | 1963-04-23 | Aircraft Radio Corp | Radar beacon receiver for positionmodulated pulse signals |
US2718638A (en) * | 1950-01-20 | 1955-09-20 | Itt | Signal correlation radio receiver |
US2839734A (en) * | 1950-05-01 | 1958-06-17 | William T Hanley | Frequency slope detection sonar |
US2935604A (en) * | 1951-12-01 | 1960-05-03 | Toro Michael J Di | Long range communication system |
US2926243A (en) * | 1951-12-11 | 1960-02-23 | Melpar Inc | Distance measuring systems |
US2841704A (en) * | 1952-04-09 | 1958-07-01 | Philco Corp | Signal integrating system |
US2767259A (en) * | 1952-10-01 | 1956-10-16 | Rca Corp | Noise compensation in electron beam devices |
US2914762A (en) * | 1954-02-24 | 1959-11-24 | Raytheon Co | Dual channel noise coherence reducers |
US3013122A (en) * | 1955-01-05 | 1961-12-12 | Gen Electric | Multiplex system |
US2908812A (en) * | 1955-11-09 | 1959-10-13 | George J Laurent | Pulse-to-pulse non-linear filters |
US2982853A (en) * | 1956-07-02 | 1961-05-02 | Research Corp | Anti-multipath receiving system |
US3042915A (en) * | 1957-04-09 | 1962-07-03 | Gen Electric | Signal processing arrangement |
US3095540A (en) * | 1960-11-17 | 1963-06-25 | Avco Corp | Intermediate frequency balance bias system |
US3205443A (en) * | 1961-06-26 | 1965-09-07 | Gen Electronic Lab Inc | Interfering signal resolving system |
US3305632A (en) * | 1963-11-14 | 1967-02-21 | Internat Telemeter Corp | Television receiver if frequency stabilizing system |
US3267384A (en) * | 1964-03-16 | 1966-08-16 | Automatic Elect Lab | Phase discriminator of optimum linearity bandwidth |
US3539932A (en) * | 1966-06-14 | 1970-11-10 | Hoffman Electronics Corp | Circuits and methods for measuring the amplitude of plural signals |
US3492576A (en) * | 1966-07-29 | 1970-01-27 | Bell Telephone Labor Inc | Differential phase modulated communication system |
US3573642A (en) * | 1969-03-10 | 1971-04-06 | Motorola Inc | Band-limited fm detector |
US4027247A (en) * | 1975-11-11 | 1977-05-31 | Bell Telephone Laboratories, Incorporated | Receiver especially for use as a diversity combining receiver with channel selection capability |
Family Cites Families (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2230212A (en) * | 1932-06-20 | 1941-01-28 | Rca Corp | Signal receiver |
US2226459A (en) * | 1935-11-23 | 1940-12-24 | Philco Radio & Television Corp | Signal-deriving circuit |
GB491728A (en) * | 1937-03-10 | 1938-09-08 | Eric Lawrence Casling White | Improvements in or relating to circuit arrangements for separating electric signal pulses |
NL88393C (en) * | 1937-06-18 | |||
CH206044A (en) * | 1937-07-11 | 1939-07-15 | Sport Ag | Method and device for receiving frequency-modulated oscillations. |
BE436744A (en) * | 1938-10-21 | |||
US2227906A (en) * | 1938-10-29 | 1941-01-07 | Rca Corp | Envelope current device |
US2212420A (en) * | 1938-12-15 | 1940-08-20 | Hazeltine Corp | Periodic wave repeater |
US2266154A (en) * | 1939-02-25 | 1941-12-16 | Emi Ltd | Thermionic valve circuits |
US2239757A (en) * | 1940-01-02 | 1941-04-29 | Rca Corp | Signal detecting system |
US2340432A (en) * | 1942-05-23 | 1944-02-01 | Rca Corp | Phase modulation receiver |
-
0
- BE BE476627D patent/BE476627A/xx unknown
- BE BE480687D patent/BE480687A/xx unknown
-
1941
- 1941-12-19 GB GB16435/41A patent/GB579117A/en not_active Expired
-
1942
- 1942-11-23 US US466655A patent/US2426187A/en not_active Expired - Lifetime
-
1944
- 1944-05-30 US US538062A patent/US2462110A/en not_active Expired - Lifetime
-
1946
- 1946-08-29 FR FR939281D patent/FR939281A/en not_active Expired
-
1947
- 1947-03-31 ES ES0177443A patent/ES177443A1/en not_active Expired
- 1947-08-05 FR FR951004D patent/FR951004A/en not_active Expired
- 1947-09-23 CH CH272430D patent/CH272430A/en unknown
Also Published As
Publication number | Publication date |
---|---|
FR939281A (en) | 1948-11-09 |
BE476627A (en) | |
CH272430A (en) | 1950-12-15 |
US2462110A (en) | 1949-02-22 |
ES177443A1 (en) | 1947-05-01 |
BE480687A (en) | |
US2426187A (en) | 1947-08-26 |
FR951004A (en) | 1949-10-13 |
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