GB596877A - Improvements in or relating to circuit arrangements for suppressing the carrier in amodulated carrier wave - Google Patents
Improvements in or relating to circuit arrangements for suppressing the carrier in amodulated carrier waveInfo
- Publication number
- GB596877A GB596877A GB11299/45A GB1129945A GB596877A GB 596877 A GB596877 A GB 596877A GB 11299/45 A GB11299/45 A GB 11299/45A GB 1129945 A GB1129945 A GB 1129945A GB 596877 A GB596877 A GB 596877A
- Authority
- GB
- United Kingdom
- Prior art keywords
- carrier
- amplifier
- coil
- pure
- gain
- 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
- H03C—MODULATION
- H03C1/00—Amplitude modulation
- H03C1/52—Modulators in which carrier or one sideband is wholly or partially suppressed
Landscapes
- Amplitude Modulation (AREA)
- Gyroscopes (AREA)
Abstract
596,877. Modulating systems. SPERRY GYROSCOPE CO., Inc. May 3, 1945, No. 11299. Convention date, May 3, 1944. [Class 40 (v)] [Also in Group XXXV] A modulated carrier wave is relieved of its carrier component by applying it to two branched channels which are ultimately recombined in an output circuit, one channel including an amplitude-levelling valve and a variable-gain amplifier, the other including a phase-shifting network. The gain of the variable amplifier being automatically adjusted so that the pure carrier is balanced out at the output. The modulated carrier applied at terminals 11 feeds two channels 12, 13, the channel 12 including an amplifier 17 giving a gain which varies inversely with its input voltage, thus levelling the wave amplitude. After passing reversed limiters 18, 19, the wave is fed through a link circuit 22 and a tuned amplifier 15 to terminals 24 at which pure carrier may be taken off. The pure carrier is also fed to a combining coil 33. The other channel 13 includes an amplifier 26 and a phase-shifting network 27 which feeds carrier and side-bands into the coil 33 in such phase that the two carrier feeds are in opposition and tend to cancel out. Any residual carrier is detected by the balanced modulator 34, the valves 35, 36 being fed in push-pull from the coil 33 and in parallel from the link circuit 22. Any residual carrier present in the coil 33 gives an unbalanced D.C. voltage in the anode circuits of the valves 35, 36 which is used as automatic gain control bias for the amplifier 15 and causes a balance of pure carrier in the coil 33, so that pure side-bands are available at the terminals 32. The A.G.C. bias derived from the balanced modulator may be applied in opposite senses to the valves 15, 26 (Fig. 2, not shown).
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US533992A US2423866A (en) | 1944-05-03 | 1944-05-03 | Wave separator |
Publications (1)
Publication Number | Publication Date |
---|---|
GB596877A true GB596877A (en) | 1948-01-13 |
Family
ID=24128264
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB11299/45A Expired GB596877A (en) | 1944-05-03 | 1945-05-03 | Improvements in or relating to circuit arrangements for suppressing the carrier in amodulated carrier wave |
Country Status (3)
Country | Link |
---|---|
US (1) | US2423866A (en) |
FR (1) | FR963714A (en) |
GB (1) | GB596877A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1206034B (en) * | 1961-11-17 | 1965-12-02 | Siemens Ag | Automatic compensation of a bridge modulator circuit of a carrier frequency amplifier |
DE1276135B (en) * | 1964-04-03 | 1968-08-29 | Rca Corp | Device for generating carrier-free and modulation-signal-free sidebands of a modulated carrier oscillation |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
USRE24053E (en) * | 1949-01-11 | 1955-08-23 | Source | |
US2629782A (en) * | 1949-08-20 | 1953-02-24 | Bell Telephone Labor Inc | Reduction of phase distortion |
US2679629A (en) * | 1950-03-15 | 1954-05-25 | Gen Electric | Frequency measuring circuit |
US2703865A (en) * | 1950-05-15 | 1955-03-08 | Int Standard Electric Corp | Frequency modulation carrier current system |
US2991408A (en) * | 1957-02-28 | 1961-07-04 | Sperry Rand Corp | Modulation suppressor |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
USRE15089E (en) * | 1921-04-19 | Radiotelephony | ||
US1976457A (en) * | 1931-09-17 | 1934-10-09 | Bell Telephone Labor Inc | Method of and means for removing modulation from a modulated wave |
-
0
- FR FR963714D patent/FR963714A/fr not_active Expired
-
1944
- 1944-05-03 US US533992A patent/US2423866A/en not_active Expired - Lifetime
-
1945
- 1945-05-03 GB GB11299/45A patent/GB596877A/en not_active Expired
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1206034B (en) * | 1961-11-17 | 1965-12-02 | Siemens Ag | Automatic compensation of a bridge modulator circuit of a carrier frequency amplifier |
DE1276135B (en) * | 1964-04-03 | 1968-08-29 | Rca Corp | Device for generating carrier-free and modulation-signal-free sidebands of a modulated carrier oscillation |
Also Published As
Publication number | Publication date |
---|---|
FR963714A (en) | 1950-07-19 |
US2423866A (en) | 1947-07-15 |
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