This article addresses the problem of designing twochannel near-perfect-reconstruction lter banks over multidimensional lattices. First, a cosine-modulated lter structure having arbitrary spatial shift and phase parameters is considered. The use of this structure leads to many possible two-channel multirate systems. The perfect reconstruction conditions are studied and appropriate choices for t...

1. The dynamics of the centre mechanism of individual cat X retinal ganglion cells is investigated. The visual stimuli consist of temporal contrast modulation of stationary patterns. In order to study the response of the centre mechanism, patterns were either sine gratings of high spatial frequency or small circular spots positioned over the receptive-field centre. 2. Responses to contrast reve...

The origin of quasi periodic modulations of flux in the kilohertz range (kHz QPOs), observed in lowmass X-ray binaries, is usually assumed to be physically distinct from that of the “normal branch oscillations” (NBOs) in the Z-sources. We show that a low-frequency modulation of the kHz QPOs is a natural consequence of the non-linear relativistic resonance suggested previously to explain the pro...

Satellite transmissions classically use constant amplitude linear modulation schemes, such as M-state phase shift keying (M-PSK), because of their high robustness to amplifier non-linearities. However, other modulation formats are interesting in a satellite transmission context. For instance, non-linear modulations such as Gaussian minimum shift keying (GMSK) present a higher spectral efficienc...

Non-linear frequency modulation infrared thermal wave detection system was established to detect and analyze debonding defects of different sizes CFRP laminates. Principal component analysis, signal reconstruction, total harmonic distortion are used process the image sequence collected by imager, processing effect is evaluated signal-to-noise ratio. Compared with other two algorithms, principal...

In this paper, three state of the art non-stationary sinusoidal analysis methods based on Fourier transform (FT) are compared the derivative method, reassignment and generalized reassignment. 1 The derivative method and reassignment were designed to analyze linear log-AM/linear FM sinusoids. Generalized reassignment can analyze sinusoids containing arbitrary order modulations, however the discu...

The dependence on spin-lattice (T1) relaxation of the first-harmonic absorption EPR signal (V'1) detected in phase quadrature with the Zeeman modulation has been investigated both theoretically and experimentally for nitroxide spin labels. Spectral simulations were performed by iterative solution of the Bloch equations that contained explicitly both the modulation and microwave magnetic fields ...

Last years, Wavelet Packet Modulation (WPM) or Wavelet Packet Transform based Orthogonal Frequency Division Multiplexing (WPT-OFDM) have been introduced to wired and wireless communication fields as efficient Multicarrier Modulation (MCM) techniques. The wavelets have interesting features such as flexibility, compatibility and localization in both time and frequency domains with no need to use ...