GB412904A - Improvements in or relating to modulated carrier wave communication systems - Google Patents

Improvements in or relating to modulated carrier wave communication systems

Info

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
Application number
GB2668832A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
BAE Systems Electronics Ltd
Original Assignee
Marconis Wireless Telegraph Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Priority to US565005A priority Critical patent/US2114335A/en
Application filed by Marconis Wireless Telegraph Co Ltd filed Critical Marconis Wireless Telegraph Co Ltd
Priority to GB2668832A priority patent/GB412904A/en
Publication of GB412904A publication Critical patent/GB412904A/en
Expired legal-status Critical Current

Links

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.
GB2668832A 1931-09-25 1932-09-26 Improvements in or relating to modulated carrier wave communication systems Expired GB412904A (en)

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)

* Cited by examiner, † Cited by third party
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

Cited By (1)

* Cited by examiner, † Cited by third party
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

Similar Documents

Publication Publication Date Title
GB527666A (en) Improvements in or relating to modulated carrier wave signalling systems
US2378298A (en) Composite-modulation radio service system
GB539793A (en) Improvements in or relating to fading compensation in radio receivers
GB868952A (en) Compatible single sideband radio transmission system
US2989622A (en) Hybrid sideband frequency modulation system
GB548599A (en) Improvements in frequency modulation systems for radio communication
GB784663A (en) Improvements in or relating to single-sideband radio transmission systems
GB412904A (en) Improvements in or relating to modulated carrier wave communication systems
US2007416A (en) Volume control circuit
US2114335A (en) Reception of phase modulated waves
GB388213A (en) Improvements in or relating to modulated carrier wave signal transmitting and receiving systems
GB448448A (en) Improvements in or relating to modulated carrier wave receivers
GB413647A (en) Improvements in or relating to carrier wave transmission systems
US2186146A (en) Side band suppression system
Crosby Exalted-carrier amplitude-and phase-modulation reception
US2173156A (en) Amplitude modulation reception
GB426228A (en) Improvements in or relating to radio signalling
JP2802089B2 (en) Microwave relay method
JPS6340925Y2 (en)
US2712598A (en) Wireless broadcasting systems
GB1391289A (en) Four channel stereophonic system
GB336096A (en) Improvements in multiplex high frequency signalling systems
US6927623B2 (en) Amplitude-modulated signal receiving circuit
GB468172A (en) Improvements in or relating to radio receiving and other modulated carrier wave apparatus
US20030103631A1 (en) Medium-frequency stereo broadcast receiving circuit