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About 10,000 papers for “Frequency modulation”
Bruno Korst · 2016
This experiment includes the simulation and implementation of both FM modulator and demodulator. The particular case of a sinusoidal message signal modulating a sinusoidal carrier will be studied in detail. At the end of the experiment, students are encouraged to pair with neighbouring groups to implement a full modulation-demodulation system, using music from an mp3 player/phone and listening to the demodulated signal with
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J.S. Donal · Elsevier eBooks · 1961
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W.L. Everitt · Electrical Engineering · 1940
RADIO communication makes use of a medium common to the whole world for the transmission of many signals simultaneously. In order to accomplish this a high-frequency electromagnetic wave has one of its characteristics varied in accordance with the instantaneous variations of the signal to be transmitted. The control of these variations is called modulation. The various simultaneous messages can then be separated by: (a). Differences in the frequency band used. (b). Differences in signal strength. (c). Differences in direction of the source.
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Goldsmith, Alfred N.
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Hund, August, 1887- · The Journal of the Abraham Lincoln Association
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Electronics handbook series · 2000
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SpringerReference · 2011
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SpringerReference · 2011
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L.B. Fertig, J. H. Mc Clellan · Encyclopedia of RF and Microwave Engineering · 2005
Abstract In this article, concepts relating to instantaneous frequency, along with algorithms for its computation, are reviewed. First, several means by which instantaneous frequency is commonly defined are discussed, and the relationships between instantaneous frequency and time–frequency distributions are explored. Next, several measures of performance commonly used to evaluate instantaneous frequency algorithms, such as the Cramer–Rao lower bound, are examined. Finally, a number of algorithms that have been suggested for IFE are summarized. Despite the relative maturity of frequency modulation in the field of radiocommunications, the field of IFE is a growing one, and one in which research is still quite active.
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2024
Citation: 'modulation frequency' in the IUPAC Compendium of Chemical Terminology, 5th ed.; International Union of Pure and Applied Chemistry; 2025. Online version 5.0.0, 2025. 10.1351/goldbook.09955 • License: The IUPAC Gold Book is licensed under Creative Commons Attribution-ShareAlike CC BY-SA 4.0 International for individual terms. Requests for commercial usage of the compendium should be directed to IUPAC.
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Omas FGT · Bulletin of Miscellaneous Information (Royal Gardens Kew) · 2007
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Arguimbau, Lawrence Baker, Stuart, R D · CERN Document Server (European Organization for Nuclear Research) · 1956
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K.R. Sturley · The journal of the Institution of Electrical Engineers. Part 3, Radio and communication engineering · 1945
Frequency modulation is likely to play an important part in postwar radio developments. The present position of this method of communication is here reviewed; a brief discussion of the features of the three methods of modulation—amplitude, frequency and phase—is followed by a survey of the history of frequency modulation, with a consideration of its limitations, advantages and present applications.The first of the two main Sections of the paper is concerned with the production of a frequency-modulated signal; direct and indirect (integrated phase-modulation) methods are examined with particular reference to the variable-reactance valve modulator with automatic mean-frequency correction, and the indirect transposed-sideband modulator with a crystal-controlled master oscillator. Measuring and monitoring equipment is also described.The second main Section deals with frequency-modulated reception, and indicates the essential features of a frequency-modulated receiver, which, except for the amplitude limiter and frequency-to-amplitude converter (examined in detail), is similar to its ultra-short-wave counterpart for amplitude modulation. Also included are three Subsections dealing with tuning indicators, frequency-deviation compression, and distortion and interference. Possible future developments are discussed, and the paper concludes with a bibliography of the most important contributions to the literature of frequency modulation made over the past twenty years.
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Baghdady, Elie J. · DSpace@MIT (Massachusetts Institute of Technology) · 1957
Contains a report on a research project.
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2007
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Shapiro, L. D., Weiner, D. D. · DSpace@MIT (Massachusetts Institute of Technology) · 1957
Contains reports on two research projects.
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Luke, K. P., Sheftman, F. I. · DSpace@MIT (Massachusetts Institute of Technology) · 1958
Contains reports on two research projects.
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D. I. Dalgleish · Institution of Engineering and Technology eBooks · 1989
This chapter discusses frequency modulation (FM). FM was used for all the early satellite communications transmissions, firstly because it made it possible to achieve acceptable performance with the very limited power available from the satellites of the 1960s and secondly because much of the technology required had already been developed for terrestrial radio-relay systems.
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Steven A. Tretter · Information technology: transmission, processing and storage · 2003
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Yuliang Zhou, Sui Zhan, Yuanchao Geng et al. · Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE · 2013
For better performance of laser coupling in inertial confinement fusion (ICF), beam shaping of the focus spot is required. Among all the beam smoothing methods, the multi frequency modulation smoothing by spectral dispersion (MultiFM-SSD) proposed by LLE has the advantages of the faster smoothing and better operability. Strong frequency modulation to amplitude modulation conversion(FM-to-AM) will take place because of the complex spectrum imposed by the multi frequency modulators applied in the Multi FM-SSD method. The FM-to-AM effect is studied with numerical simulation including the polarization mode dispersion and group velocity dispersion. The results reveal that the modulation frequencies and bandwidths of multi modulators will influence the contrast degree of the FM-to-AM effect. The compensation of the FM-to-AM with arbitrary waveform generator (AWG) is also numerically simulated. The FM-to-AM effect is effectively suppressed, i.e. the non-uniformity of the pulse decreases substantially, by applying multiple intensity and phase compensation (the compensation function is obtained via G-S algorithm).
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