Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 131 for “"Frequency modulation"”.
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Generalized frequency modulation
In frequency modulation (FM) systems, a continuous-time information signal is modulated onto a sinusoidal carrier wave by using the information signal to modulate the frequency of the carrier wave. In this thesis, a more general type of modulation is developed, of which FM is a special case, that …
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Efficient frequency modulation systems
[114] leaves. 2 reprints
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A music synthesizer using frequency modulation.
Thesis. 1976. B.S.--Massachusetts Institute of Technology. Dept. of Electrical Engineering and Computer Science.
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A Wide-Bandwidth Galvanically Isolated Current Sensor with Frequency Modulation
… includes a voltage-controlled oscillator-based frequency modulator that offers inductive galvanic isolation and a phase-locked loop-based frequency demodulator. This current sensor solution is implemented in a 65nm CMOS technology, occupies an area of 1.88 mm^2, and achieves a bandwidth of 12.5 …
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The design of a radio altimeter using frequency modulation method
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering, 1937 [second author], and Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Aeronautical Engineering, 1937 [first author].
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Reduction of power supply EMI emission by switching frequency modulation
The effect of PWM frequency modulation on power supply conducted EM! noise emission is investigated. Significant reduction of emission is possible with PWM frequency modulation scheme. A forward converter is used to verify the effectiveness of the scheme. A guidance of parameter selection for noise …
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Numerical modeling and ray tracing of SPatIal Frequency modulation for Imaging
… of a simple system that implements SPatIal Frequency modulation for Imaging (SPIFI). SPIFI utilizes a chirped frequency mask that modulates the intensity of light along a single axis at a linear frequency sweep giving each lateral position a unique spatial frequency. By taking the Fourier …
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Evaluation of frequency modulation for reducing acoustic feedback in hearing aids
Thesis (M.Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1997.
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A survey of frequency modulation broadcast programming policy in north central Ohio
Thesis (M.A.)--Michigan State University of Agriculture and Applied Science. Dept. of Television and Radio, 1961
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Transient frequency modulation absorption spectroscopy as a probe of gas-liquid scattering
… of gas-liquid scattering dynamics via transient frequency modulated absorption spectroscopy (TFMAS). Using this technique in the near infrared (NIR), the inelastic scattering of gaseous CN(X 2Σ +) radicals from fluorinated and aliphatic liquid surfaces was found to be predominantly impulsive. …
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Development and Utilization of the Frequency Modulation Subcarrier as a Commercial Communications Medium
Made available in DSpace on 2015-05-12T21:38:59Z (GMT). No. of bitstreams: 2 license.txt: 4848 bytes, checksum: 96035ab3f5e1c23cc7138a224ce498bd (MD5) 6607710.PDF: 7195189 bytes, checksum: 06876f99f8c415eda6135332fda155ac (MD5) Previous issue date: 1966
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Extending frequency modulation spectroscopy : sensitive and selective high resolution laser absorption in the visible and ultraviolet
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Chemistry, 1996.
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Spectral Matching of Musical Instrument Tones
… music: finding parameters for wavetable and frequency modulation (FM) synthesis that reproduce a particular tone. Previous FM and wavetable matching methods have used trial-and-error or computationally expensive techniques in matching sounds.
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RF phase modulation of optical signals and optical/electrical signal processing
Analog RF phase modulation of optical signals has been a topic of interest for many years, mainly focusing on Intensity Modulation Direct Detection (IMDD). The virtues of coherent detection combined with the advantages of Frequency Modulation, however, have not been explored thoroughly. By …
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Unified Three-terminal Switch Model for Current Mode Controls
… model for current-mode control in the frequency domain. A continuous time domain model was recently proposed as a successful model for current-mode control architectures with different implementation. However, the model was derived by describing function method, which is very …
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Spectrum Awareness: Deep Learning and Isolation Forest Approaches for Open-set Identification of Signals
… waveform (Single-Carrier (SC), Single-Carrier Frequency Division Multiple Access (SC-FDMA), Orthogonal Frequency Division Multiplexing (OFDM), Amplitude Modulation (AM), Frequency Modulation (FM)) or a radar waveform (Linear Frequency Modulation (LFM) or Phase-coded). However, the downside to …
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Spread spectrum modulation system for burst mode DC-DC converters
… in the audible range. This thesis explores a frequency modulation scheme and transient control that attenuates audible noise harmonics while minimizing the tradeoff for converter regulation, efficiency, and output voltage ripple.
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Modulation of alternating current waves
… in clear and logical form, an analysis of high-frequency modulation. This will be done in order to explain each of the various methods of obtaining modulation, and the characteristics of the resultant waves. The question of side bands will be considered in detail. The subject of circuits and …
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A Comprehensive Study of Hybrid Vertical -Cavity Surface -Emitting Lasers
The high frequency modulation response for hybrid VCSELs is measured and compared to the theoretical response of the VCSEL derived through small signal analysis, with good agreement. For the two single mode structure wafers measured, the VCSELs with the implant aperture located farther away from …
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