Acoustic characteristics of speech signals differ with gender due to physiological differences of the glottis and the vocal tract. Previous research [1] showed that adding the voice-source related measuresH∗ 1 −H∗ 2 andH∗ 1 −A3 improved gender classification accuracy compared to using only the fundamental frequency (F0) and formant frequencies. H∗ i refers to the i–th source spectral harmonic m...

We demonstrated a 670 mW continuous-wave single-frequency laser source at 780 nm by using external-cavity-enhanced second-harmonic generation of a seeded fiber amplifier in periodically poled lithium niobate. A maximum second-harmonic conversion efficiency of 58% was achieved. The source can work stably over 1 h by locking the frequency-doubling cavity, while the power stability is less than 2%.

This paper describes a method for decomposing steady-state instrument data into excitation and formant filter components. The input data, taken from several series of recordings of acoustical instruments is analyzed in the frequency domain, and for each series a model is built, which most accurately represents the data as a source-filter system. The source part is taken to be a harmonic excitat...

on a region Da UN with known potential 4> and permeability K. In the physical situation, K is determined in a laboratory test of a core sample and can be quite unrepresentative of the real permeability. The potential is more accurately measured as the height of a water column, but is also subject to some measurement error. Consequently, a direct calculation of / by performing the differentiatio...

Biomedical Engineering) Harmonic Source Wavefront Correction for Ultrasound Imaging

In this paper we propose a new method for a generalized model representing the time-varying spectral characteristics of quasi harmonic instruments. This approach comprises a linear sourcefilter model, a parameter estimation method and a model evaluation based on the prototype’s variance. The source-filter-model is composed of an excitation source generating sinusoidal parameter trajectories and...