GB601135A - Electric pulse modulating systems - Google Patents
Electric pulse modulating systemsInfo
- Publication number
- GB601135A GB601135A GB19333/45A GB1933345A GB601135A GB 601135 A GB601135 A GB 601135A GB 19333/45 A GB19333/45 A GB 19333/45A GB 1933345 A GB1933345 A GB 1933345A GB 601135 A GB601135 A GB 601135A
- Authority
- GB
- United Kingdom
- Prior art keywords
- pulses
- pulse
- width
- circuit
- undulations
- 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
- 238000013016 damping Methods 0.000 abstract 1
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B14/00—Transmission systems not characterised by the medium used for transmission
- H04B14/02—Transmission systems not characterised by the medium used for transmission characterised by the use of pulse modulation
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K7/00—Modulating pulses with a continuously-variable modulating signal
- H03K7/08—Duration or width modulation ; Duty cycle modulation
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K9/00—Demodulating pulses which have been modulated with a continuously-variable signal
- H03K9/08—Demodulating pulses which have been modulated with a continuously-variable signal of duration- or width-mudulated pulses or of duty-cycle modulated pulses
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Electrotherapy Devices (AREA)
- Manipulation Of Pulses (AREA)
- Transmission Systems Not Characterized By The Medium Used For Transmission (AREA)
- Amplifiers (AREA)
- Particle Accelerators (AREA)
- Radar Systems Or Details Thereof (AREA)
- Channel Selection Circuits, Automatic Tuning Circuits (AREA)
- Variable-Direction Aerials And Aerial Arrays (AREA)
Abstract
601,135. Pulse modulation circuits. STANDARD TELEPHONES & CABLES, Ltd. July 27, 1945, No. 19333. Convention date, July 29, 1944. [Class 40 (v)] In a pulse width modulating system, a tuned circuit is recurrently shock-excited to produce a series of undulations, the tuning being varied by the modulation voltage to vary the width of the undulations and the derived pulses. Pulses from a generator 1 shock-excite the tuned circuit 2, the diode 3 damping out the wave train after the first positive half-cycle. A modulating voltage from source 5 applied to the reactance valve 4 causes the tuning of the circuit 2 to vary, changing the width of the first positive half-cycle. This undulation is fed. through a high-pass filter 6 to a pulseshaping amplifier 7 and to a differentiating and inverting circuit 8 to produce narrow pulses coincident with the leading and trailing edges of the first pulse. Where the input pulses are of short duration, they may be converted into a saw-tooth wave, Fig. 3 (not shown), to prevent the generation of undesired waveforms by the trailing edges. Specification 600,284 is referred to.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US547124A US2421025A (en) | 1944-07-29 | 1944-07-29 | Demodulator system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB601135A true GB601135A (en) | 1948-04-28 |
Family
ID=24183427
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB13867/45A Expired GB601128A (en) | 1944-07-29 | 1945-06-01 | Improvements in or relating to arrangements for demodulating duration modulated pulses |
| GB19333/45A Expired GB601135A (en) | 1944-07-29 | 1945-07-27 | Electric pulse modulating systems |
Family Applications Before (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB13867/45A Expired GB601128A (en) | 1944-07-29 | 1945-06-01 | Improvements in or relating to arrangements for demodulating duration modulated pulses |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US2421025A (en) |
| BE (1) | BE474952A (en) |
| ES (1) | ES179746A1 (en) |
| FR (3) | FR951329A (en) |
| GB (2) | GB601128A (en) |
Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| BE458361A (en) * | 1945-03-15 | |||
| US2570236A (en) * | 1945-04-28 | 1951-10-09 | Conrad H Hoeppner | Discriminator circuit |
| US2532338A (en) * | 1945-11-15 | 1950-12-05 | Columbia Broadcasting Syst Inc | Pulse communication system |
| US2605409A (en) * | 1946-03-27 | 1952-07-29 | Forbes Gordon Donald | Pulse narrowing circuit |
| US2462100A (en) * | 1946-04-18 | 1949-02-22 | Fed Telecomm Lab Inc | Demodulator system for time modulated pulses |
| US2529172A (en) * | 1948-12-30 | 1950-11-07 | Gen Electric | Pulse discriminating circuits |
| US2702853A (en) * | 1950-02-08 | 1955-02-22 | Gen Electric | Wave shaping circuits |
| FR1116169A (en) * | 1953-11-04 | 1956-05-04 | Gen Electric Co Ltd | Electric circuit with stabilized decrement |
| BE562784A (en) * | 1956-11-30 | |||
| US4521736A (en) * | 1979-05-09 | 1985-06-04 | Ampex Corporation | Demodulator for pulse width modulated signals |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2181309A (en) * | 1935-04-09 | 1939-11-28 | Telefunken Gmbh | Electrical impulse segregation circuit |
| US2113214A (en) * | 1936-10-29 | 1938-04-05 | Rca Corp | Method of frequency or phase modulation |
| BE428656A (en) * | 1937-06-18 | |||
| US2359447A (en) * | 1942-06-20 | 1944-10-03 | Rca Corp | Electrical circuit |
| US2391776A (en) * | 1943-05-29 | 1945-12-25 | Rca Corp | Intelligence transmission system |
-
0
- BE BE474952D patent/BE474952A/xx unknown
-
1944
- 1944-07-29 US US547124A patent/US2421025A/en not_active Expired - Lifetime
-
1945
- 1945-06-01 GB GB13867/45A patent/GB601128A/en not_active Expired
- 1945-07-27 GB GB19333/45A patent/GB601135A/en not_active Expired
-
1947
- 1947-08-06 FR FR951329D patent/FR951329A/en not_active Expired
- 1947-08-06 FR FR57637D patent/FR57637E/en not_active Expired
- 1947-08-06 FR FR57636D patent/FR57636E/en not_active Expired
- 1947-09-16 ES ES0179746A patent/ES179746A1/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| FR951329A (en) | 1949-10-29 |
| GB601128A (en) | 1948-04-28 |
| FR57637E (en) | 1953-03-17 |
| US2421025A (en) | 1947-05-27 |
| BE474952A (en) | |
| ES179746A1 (en) | 1947-11-01 |
| FR57636E (en) | 1953-03-17 |
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