نتایج جستجو برای: excitation frequency
تعداد نتایج: 537625 فیلتر نتایج به سال:
In this work strange behaviour of an impact oscillator with a one sided elastic constraint discovered experimentally [1, 2] is compared with the predictions obtained using its mathematical model. Particular attention is paid to the chaos recorded near grazing frequency when a non-impacting orbit becomes an impacting one under increasing excitation frequency. Extensive experimental investigation...
The paper presents the speaker normalization technique we implemented in a teaching and training system for hearing handicapped children with the goal to reduce inter-speaker variability in time-frequency speech representation. In an effort to reduce variance caused by variation in vocal tract shape among speakers, a formant based nonlinear frequency warping approach to vocal tract normalizatio...
Coherent excitation and control of lattice motion by electromagnetic radiation in optical frequency range has been reported through variety of indirect interaction mechanisms with phonon modes. However, coherent phonon excitation by direct interaction of electromagnetic radiation and nuclei has not been demonstrated experimentally in terahertz (THz) frequency range mainly due to the lack of THz...
We report on amplitude and phase imaging of out-of-plane sinusoidal surface vibration at nanometer scales with a heterodyne holographic interferometer. The originality of the proposed method is to make use of a multiplexed local oscillator to address several optical sidebands into the temporal bandwidth of a sensor array. This process is called coherent frequency-division multiplexing. It enabl...
In primary auditory cortex (AI) neurons, tones typically evoke a brief depolarization, which can lead to spiking, followed by a long-lasting hyperpolarization. The extent to which the hyperpolarization is due to synaptic inhibition has remained unclear. Here we report in vivo whole-cell voltage-clamp measurements of tone-evoked excitatory and inhibitory synaptic conductances of AI neurons of th...
A new method for two-band approximation of excitation signals in an LPC model, to improve speech naturalness in very low rate coding, is proposed. Based on a simpli ed model of Multi-Band Excitation, the method accurately determines the degree of periodicity, using the concept of Instantaneous Frequency (IF) estimation in frequency domain. The harmonic structure in the spectrum of LPC residual,...
To solve the problem of resonance during quasi-static calibration of high-g accelerometers, we deduce the relationship between the minimum excitation pulse width and the resonant frequency of the calibrated accelerometer according to the second-order mathematical model of the accelerometer, and improve the quasi-static calibration theory. We establish a quasi-static calibration testing system, ...
This paper examines the Lombard effect on the excitation features in speech production. These features correspond mostly to the acoustic features at subsegmental (< pitch period) level. The instantaneous fundamental frequency F0 (i.e., pitch), the strength of excitation at the instants of significant excitation and a loudness measure reflecting the sharpness of the impulse-like excitation aroun...
This presentation concerns the simulation of disordered voices. The synthesis is based on shaping functions, which are nonlinear memoryless inputoutput characteristics that transform a trigonometric driving function into a synthetic phonatory excitation signal. One advantage of the shaping fuction model is that the instantaneous frequency and the spectral balance of the phonatory excitation sig...
As power electronic converters become more widely used in aviation systems, the associated capacitive loads harmonic filter circuits increase accordingly. The risk of self-excitation aeronautical synchronous generators due to is thus increased. Compared with a generator conventional fixed-frequency system, this process complicated variable-frequency supply (360–800 Hz), as both varied frequency...
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