In this paper we propose excitation-based features for extracting information about the manner of articulation for stop consonants. The excitation-based features are derived from very low frequency information in the signal and also from the normalized error computed from the linear prediction residual. The proposed zero-frequency filtered signal brings out the region of glottal activity during...

A study has been made on the parametric excitation of a nonlinear system with hardening springs. I n the parametric excitation of linear systems, the only subharmonic predicted i s a subharmonic of order 1/2. However, i n the parametric excitation of nonlinear systems, i t i s shown th I ? higher order subharmonics can exist, depending both on the amplitude and frequency of the parametric excit...

Primary sensory cortical areas continuously receive thalamic inputs that arrive at different frequencies depending on the amount of sensory activity. The cortical response to repeated sensory stimuli rapidly adapts and different frequencies recruit cortical neuronal networks to different extents. GABAergic inhibition limits the spread of excitation within cortical neuronal networks. However, it...

Excitation spectra of single GaAs/AlxGa12xAs quantum dots ~QD’s! are studied by using a technique of far-infrared single-photon detection. The spectra consist of a single resonance line, the resonance frequency of which is by several percent larger than the cyclotron-resonance frequency but is substantially smaller than the magnetoplasma frequencies of mesa-etched QD’s earlier found through the...