High-frequency asymptotic representation of a wave field concentrated near the boundary of an elastic mediumNo Abstract available for this article.doi:10.1007/BF01086732P. V. KrauklisN. V. TsepelevKluwer Academic Publishers-Plenum PublishersJournal of Soviet Mathematics
where N is an integer mode number between 100,000 and 1,000,000, that multiplies fr from the microwave domain to the optical domain. Fig. 1 Frequency comb representations and detection of the offset frequency. a Time and frequency domain representation of an optical frequency comb. The optical...
a Time-domain representation of the THz signal reflected from a single-layer PET foil with a nominal thickness of 23 µm (blue) and corresponding model function (orange) used for thickness determination. Details on the model function can be found in the “Methods” section. b Spectral amp...
For the sake of illustration, let ∊(t) be zero, then p(t) is the ideal linear up chirp pulse that can be found in the literature. In analytic signal representation such chirp pulse is given by (21)p(t)=ψ(t)expj2πfct+Kc2t2+θ0 The PSD of chirp pulses centered at 4492.8 ...
A phase locked loop (PLL) compares a divided down representation of the oscillator with a frequency reference. The PLL’s output is level shifted to provide the high voltage necessary to bias the varactor, which closes a feedback loop by voltage tuning the oscillator. This loop forces the ...
We first transform the constant-Q acoustic wave equation into the corresponding wave integral representation with the Green’s function accounting for viscoelastic coefficients in the frequency domain. The frequency-domain BE method is used to solve the integral equation for each subregion in multilayer...
However, the beat spectrogram represents the variation of tempo over time while the joint acoustic and modulation representation reveals rhythmic patterns independently of time. The difference between both representations is that the beat spectrogram provides temporal information while it neglects the ...
QTFDs seek to combine the instantaneous power and spectralenergy densityof the signal into oneTF domain representation. However, missing samples and randomly under-sampled nonstationary signals give rise to artifacts that spread over both the TF domain and the ambiguity domain, which are related by...
Signal waveform is the basic physical layer element that fundamentally determines the most important key performance indicator in communication systems, namely spectral efficiency. Traditional waveforms rely on orthogonal Nyquist shaping but result in re
determines which frequency is used. Analog-to-digital converter 16 is designed to provide a digital representation of an input signal burst with resolution sufficient to preserve the frequency information and yield an indication of the signal amplitude. A signal burst has two structural components: a...