GB1013761A - Improved compatible single-sideband system - Google Patents
Improved compatible single-sideband systemInfo
- Publication number
- GB1013761A GB1013761A GB2237162A GB2237162A GB1013761A GB 1013761 A GB1013761 A GB 1013761A GB 2237162 A GB2237162 A GB 2237162A GB 2237162 A GB2237162 A GB 2237162A GB 1013761 A GB1013761 A GB 1013761A
- Authority
- GB
- United Kingdom
- Prior art keywords
- modulation
- amplitude
- carrier
- wave
- phase
- 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
- H03C1/60—Modulators in which carrier or one sideband is wholly or partially suppressed with one sideband wholly or partially suppressed
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
- H03F1/02—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation
- H03F1/0205—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation in transistor amplifiers
- H03F1/0294—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation in transistor amplifiers using vector summing of two or more constant amplitude phase-modulated signals
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
Abstract
1,013,761. Single sideband systems. L. R. KAHN. June 8, 1962 [June 14, 1961], No. 22371/62. Heading H3R. In a compatible S.S.B. transmitter an S.S.B. wave (without carrier) is produced and applied to a pair of networks 26, 28 non-linearly processing its amplitude so that the ratio of its amplitude to the original modulation amplitude increases with the latter; and then each of the network outputs added in summation circuits 30, 46 to pure carrier of amplitudes respectively equal to and twice the maximum amplitude level of the two processed S.S.B. waves (without carrier). This produces 1 PM and 0À5 PM single sideband plus carrier waves respectively, at 100% modulation (PM denoting phase modulation), which are then added together in a mixer 44 and transposed up in frequency from a 500 kc/s. oscillator 56. This output is then limited at 68 and transposed up to transmitter carrier frequency by an oscillator 74 before being modulated by amplitude modulating voltage, preferably derived from the S.S.B. filter 18 by a product demodulator 86 with carrier input. The non-linear networks 26, 28 ensure that at 100% modulation the phase modulation corresponds to 1PM + 0À5PM but at lower modulation levels the phase modulation is less and approximates to that of an unmodified single sideband plus carrier wave. The non- linear networks may each comprise three parallel connected paths, two of them each including a reverse biased diode oppositely poled in each case to pass only positive and negative extremes of the modulation amplitude to a phase shifting tuned network. The bias of each network is then adjusted to give the required total phase deviation as a function of the original amplitude modulation index and the square of that index, i.e. of the amplitude of the S.S.B. (without carrier) wave.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US117143A US3212008A (en) | 1961-06-14 | 1961-06-14 | Compatible single-sideband system |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1013761A true GB1013761A (en) | 1965-12-22 |
Family
ID=22371181
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB2237162A Expired GB1013761A (en) | 1961-06-14 | 1962-06-08 | Improved compatible single-sideband system |
Country Status (2)
Country | Link |
---|---|
GB (1) | GB1013761A (en) |
NL (1) | NL140378B (en) |
-
1962
- 1962-06-08 GB GB2237162A patent/GB1013761A/en not_active Expired
- 1962-06-13 NL NL279632A patent/NL140378B/en unknown
Also Published As
Publication number | Publication date |
---|---|
NL140378B (en) | 1973-11-15 |
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