22 papers · ranked by Valyu relevance
Victor Lazzarini, Joseph Timoney
Frequency modulation (FM) and phase modulation (PM) are well-known synthesis methods, which have been deployed widely in musical instruments. More recently, some synthesisers have implemented direct forms of FM (as opposed to PM), allowing, at least as part of their design, for higher-order modulation topologies.…
Parthasarathy, Rishab, Michael Popik, Noah Haefner
In this project, we wanted to discover an analog topology that could effectively convert amplitude-modulated (AM) signals to frequency-modulated (FM) signals, while also ensuring that both sets of signals were within their respective radio frequency (RF) bands. To that end, an effective topology for doing so was…
Jerry Jacob, Nitish Patel, Sucheta Sehgal, Sushank Chaudhary
Computational models of the cell can be used to study the impact of drugs and assess pathological risks. Typically, these models are computationally demanding or challenging to implement in dedicated hardware for real-time emulation. A new Frequency Modulation (FM) model is proposed to address these limitations. This…
Oleg V. Gendelman, Luis M. Baldelomar Pinto, Lawrence A. Bergman, Alexander F. Vakakis
It is shown that harmonic signals incorporating a new type of weak non-standard frequency modulation (wNSFM) have unexpected spectral properties, namely, ever expanding broadband frequency spectra with progressing time. As such, they represent a new class of signals with spectra with strong frequency-time coupling.…
David Samuel Rose, Aleksandar Opančar, Štěpán Zelníček, Veronika Šromová + 1 more
Kilohertz-frequency (kHz) electrical stimulation (1–100 kHz) is emerging as a powerful tool in both invasive and non-invasive neurostimulation applications, including functional electrical stimulation, spinal cord stimulation, and non-invasive brain stimulation. Most commonly these paradigms rely on amplitude…
Jerry Jacob, Nitish Patel, Sucheta Sehgal
Computational models of the cell can be used to study the impact of drugs and assess pathological risks. Typically, computational models are computationally demanding or difficult to implement in dedicated hardware for real-time emulation. A new Frequency Modulation (FM) model is proposed to address these limitations.…
Yanfei Cao, Junjie Su, Yan Yan, Zhichen Lin + 2 more
'Bal S. Virdee'] This paper aims to design the modulation strategy of SiC motor controller for vehicles with low EMI, low device loss and low voltage/current ripple. The equivalent evaluation model of input voltage, output current and switching loss of the inverter under periodic spread spectrum modulation strategy is…
Azalía G. Gil, Alfonso T. Muriel-Barrado, Mario Pérez-Escribano, Carlos Molero + 1 more
This paper presents the analysis, design, fabrication, and experimental validation of a dual-mode frequency/amplitude modulator based on a time-modulated varactor diode. By exploiting the varactor as a time-varying capacitor in combination with an operational amplifier configured as an inverting integrator and a…
Yuri I. Abramovich, Dan William Dickey, Víctor Abramovich
- The problem of a constant modulus (CM) continuous wave (CW) waveform design with the thumb-tack ambiguity function that meets the NTIA RSEC requirements is addressed. The ad-hoc and alternating projection techniques are proposed to modify the spectrum of a prototype waveform to meet the NTIA RSEC requirements…
Weiwei Yang, Xingyu Jia, Jingyi Wang, Xinlun Cai + 2 more
Frequency-modulated lasers (FMLs) are widely used in spectroscopy, biology, and LiDAR. These applications' performance highly depends on the fast and precise tracking of the FMLs' absolute frequencies, which remains a challenge. Here we demonstrated integrated lithium niobate electro-optic frequency combs with…
Maximilian Scherer, Tianlu Wang, Robert Guggenberger, Luka Milosevic + 1 more
Neural communication across different spatial and temporal scales is a topic of great interest in clinical and basic science. Phase-amplitude coupling (PAC) has attracted particular interest due to its functional role in a wide range of cognitive and motor functions. Here, we introduce a novel measure termed the direct…
Md Abu Zobair, Behzad Boroomandisorkhabi, Mina Esmaeelpour, Minh Long Hoang + 1 more
'Minh Long Hoang' 'Vikram Pakrashi'] This review explores various advanced photonic-assisted techniques for microwave frequency measurement, highlighting their distinct advantages and challenges in detecting multi-tone and broadband microwave frequency signals. Different optical processing techniques for instantaneous…
Jonathan Regev, Helia Relaño-Iborra, Johannes Zaar, Torsten Dau
The processing and perception of amplitude modulation (AM) in the auditory system reflect a frequency-selective process, often described as a modulation filterbank. Previous studies on perceptual AM masking reported similar results for older listeners with hearing impairment (HI) and young listeners with normal hearing…
Alexandra Barayeu, Ramona Schäfer, Jan Grewe, Jan Benda
Beats are periodic amplitude modulations resulting from the superposition of two spectrally close periodic signals, where the difference between the two signal frequencies defines the frequency of the beat. Such amplitude modulations are known to be well encoded in corresponding firing rate modulations in auditory…
Rabi Shrestha, Hichem Guerboukha, Zhaoji Fang, Edward Knightly + 1 more
'Daniel M. Mittleman'] As the demand for bandwidth in wireless communication increases, carrier frequencies will reach the terahertz (THz) regime. One of the common preconceived notions is that, at these high frequencies, signals can radiate with high directivity which inherently provides more secure channels. Here, we…
Kiwon Rhee, Jaeyoung Baik, Changhoon Song, Hyun-Chool Shin + 1 more
'Jun Chen'] The importance of information gathering is emphasized to minimize casualties and economic losses in warfare. Through electronic warfare, which utilizes electromagnetic waves, it is possible to discern the enemy’s intentions and respond accordingly, thereby leading the battle advantageously. Consequently…
Yifan Quan, Manoj V. H. Subramanya, Yifu Ouyang, Michael Mardini + 3 more
This paper presents a study of coherent dynamic nuclear polarization (DNP) using frequency swept pulses at 94 GHz which optimize the polarization transfer efficiency. Accordingly, an enhancement ℇ∼496 was observed using 10mM trityl-OX063 as the polarizing agent in a standard d8-glycerol:D2O:H2O :: 6:3:1 glassing matrix…
Authors not listed
This paper formally defines an operational isomorphism between spectral damping in molecular vibronic systems and neuromodulatory control in biological sensory systems. Without asserting causal continuity or physical identity across scales, we show that both domains instantiate the same class of output-selective…
Temidayo O. Otunniyi, Hermanus C. Myburgh, Stefano Mariani
Realising a low-complexity Farrow channelisation algorithm for multi-standard receivers in software-defined radio is a challenging task. A Farrow filter operates best at low frequencies while its performance degrades towards the Nyquist region. This makes wideband channelisation in software-defined radio a challenging…
Siyu Liu, Kaitao Lin, Weiye Hu, Zhenzhao Yi + 3 more
'Jianghai Wo' 'Jianping Yao'] Abstract—We propose and implement a microwave photonic multi-mode injection-locked frequency divider (ILFD) with a wide frequency operational range based on an optoelectronic oscillator (OEO). In the OEO, a Mach-Zehnder modulator (MZM) and a photodetector (PD) are employed to construct a…
Dimitris A. Barkas, George Ch. Ioannidis, Stavros D. Kaminaris, Constantinos S. Psomopoulos + 1 more
'Constantinos S. Psomopoulos' 'Fco Javier Rodríguez'] During the last few decades, the poor quality of produced electric power is a key factor that has affected the operation of critical electrical infrastructure such as high-voltage equipment. This type of equipment exhibits multiple different failures, which…
Authors not listed
This report compares various simulation and data analysis methods for free induction decay (FID) signals in Nuclear Magnetic Resonance (NMR) Spectroscopy. The methods discussed include discrete fast Fourier transformation (FFT), least squares fitting (LSF), short-time Fourier transformation (STFT), and wavelet…