GB412904A - Improvements in or relating to modulated carrier wave communication systems - Google Patents
Improvements in or relating to modulated carrier wave communication systemsInfo
- Publication number
- GB412904A GB412904A GB2668832A GB2668832A GB412904A GB 412904 A GB412904 A GB 412904A GB 2668832 A GB2668832 A GB 2668832A GB 2668832 A GB2668832 A GB 2668832A GB 412904 A GB412904 A GB 412904A
- Authority
- GB
- United Kingdom
- Prior art keywords
- frequency
- sideband
- output
- passed
- combined
- 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
- 238000005562 fading Methods 0.000 abstract 1
- 238000007689 inspection Methods 0.000 abstract 1
- 230000002265 prevention Effects 0.000 abstract 1
- 239000011800 void material Substances 0.000 abstract 1
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03D—DEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER
- H03D3/00—Demodulation of angle-, frequency- or phase- modulated oscillations
- H03D3/02—Demodulation of angle-, frequency- or phase- modulated oscillations by detecting phase difference between two signals obtained from input signal
- H03D3/06—Demodulation of angle-, frequency- or phase- modulated oscillations by detecting phase difference between two signals obtained from input signal by combining signals additively or in product demodulators
- H03D3/12—Demodulation of angle-, frequency- or phase- modulated oscillations by detecting phase difference between two signals obtained from input signal by combining signals additively or in product demodulators by means of discharge tubes having more than two electrodes
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Monitoring And Testing Of Transmission In General (AREA)
Abstract
412,904. Wireless receiving systems. MARCONI'S WIRELESS TELEGRAPH CO., Ltd., Marconi House, Strand, London.- (Assignees of Crosby, M. G.; Riverhead, Long Island, New York, U.S.A.) Sept. 26, 1932, No. 26688. Void [Abridged as open to inspection under Sect. 91 of the Acts, Sept. 26, 1932]. [Class 40 (v).] In a high-frequency receiving system the carrier frequency and one sideband are separated from the other sideband, rectified and passed to the translating device. The other sideband and the carrier frequency may be passed to another detector and the output from the two detectors combined additively to give increased output. Fig. 1 shows a superheterodyne receiver for phase-modulated waves comprising high and intermediate frequency amplifiers 4, 6 and filters A, B each accepting one sideband and the mean intermediate frequency, corresponding to the carrier frequency in a plain receiver. The output from the filters is passed to detectors 12, 18, the outputs of which are combined in phase opposition. For amplitude modulation the detector outputs are combined in parallel. For receiving frequency-modulated waves, a filter 15 is interposed in the audiofrequency circuit, designed to give an output to input ratio which rises proportionally with the frequency. This filter may alternatively be incorporated in the audio-frequency circuit at the transmitter. The invention is mainly applicable to the prevention of fading.
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US565005A US2114335A (en) | 1931-09-25 | 1931-09-25 | Reception of phase modulated waves |
GB2668832A GB412904A (en) | 1932-09-26 | 1932-09-26 | Improvements in or relating to modulated carrier wave communication systems |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB2668832A GB412904A (en) | 1932-09-26 | 1932-09-26 | Improvements in or relating to modulated carrier wave communication systems |
Publications (1)
Publication Number | Publication Date |
---|---|
GB412904A true GB412904A (en) | 1934-07-05 |
Family
ID=10247612
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB2668832A Expired GB412904A (en) | 1931-09-25 | 1932-09-26 | Improvements in or relating to modulated carrier wave communication systems |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB412904A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1256275B (en) * | 1964-01-03 | 1967-12-14 | Int Standard Electric Corp | Harmonic discriminator for radio navigation receivers |
-
1932
- 1932-09-26 GB GB2668832A patent/GB412904A/en not_active Expired
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1256275B (en) * | 1964-01-03 | 1967-12-14 | Int Standard Electric Corp | Harmonic discriminator for radio navigation receivers |
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