For optimal Chi((2)) nonlinear interaction the phase matching condition must be satisfied. For type I and type II phase matched materials, this is generally achieved by controlling the temperature of the nonlinear media. We describe a technique to readout the phase-matching condition interferometrically, and experimentally demonstrate feedback control in a degenerate optical parametric amplifie...

1 Manana Kereselidze, Dr., V. Gulisashvili Forest Institute of the Agricultural University of Georgia, David Aghmashenebeli Alley, 13-th km., 0159, Tbilisi, Georgia, [email protected] 2 Slavimira Draganova, Dr., Assoc.Prof., Institute of Soil Science, Agrotechnologies and Plant Protection, 9 Shosse Bankya Str., 1080 Sofia, Bulgaria, sdraganova19@ gmail.com 3,5 Daniela Pilarska, Dr., P...

Across vertebrates, the observation that lower-pitched vocalizations are typically associated with larger and/or higher quality males has lead to the widespread belief that inter- and intra-sexual selection will produce male calls with low fundamental frequencies (F0). Here we investigated the response of oestrous red deer hinds to playback of re-synthesized male roars characterized by either h...

The four experiments reported here measure listeners' accuracy and consistency in adjusting a formant frequency of one- or two-formant complex sounds to match the timbre of a target sound. By presenting the target and the adjustable sound on different fundamental frequencies, listeners are prevented from performing the task by comparing the absolute or relative levels of resolved spectral compo...

To identify a speaker's sex, listeners may rely on sex-based differences in average fundamental frequency (F0), but overlap in male and female F0 ranges undermines such judgments. To test accuracy of sex-identification throughout the F0 range, listeners were asked to judge sex based on audio recordings of /ɑ/ spoken on a number of overlapping steady F0s by 10 male and 10 female English speakers...

Fundamental and formant frequencies influence perceived pitch and are sexually dimorphic in humans. The information content of these acoustic parameters can illuminate the forces of sexual selection shaping vocal sex differences as well as the mechanisms that ensure signal reliability. We use multiple regression to examine the relationships between somatic (height, adiposity, and strength) and ...

The dynamical parameters conventionally used to specify the orbit of a test particle in Kerr spacetime are the energy E, the axial component of the angular momentum, L z , and Carter's constant Q. These parameters are obtained by solving the Hamilton-Jacobi equation for the dynamical problem of geodesic motion. Employing the action-angle variable formalism, on the other hand, yields a different...

Spectra of vowels sung a t identical pitches by two tenor voices and two alto voices a r e compared. The formant frequencies and the source spectra a r e studied by matching the spectra on a terminal analogue of the vocal tract. As regards the source spectrum the alto voices show a higher relative amplitude of the fundamental than the tenor voices. As regards the formants, ari apparent differen...

The two experiments described here use a formant-matching task to investigate what abstract representations of sound are available to listeners. The first experiment examines how veridically and reliably listeners can adjust the formant frequency of a single-formant sound to match the timbre of a target single-formant sound that has a different bandwidth and either the same or a different funda...

This paper explores the existence and nature of accommodation processes within conversation, particularly convergence of fundamental frequency (Fo) of conversational participants over time. The study raises a number of issues related to methodologies for analysing interactional (typically conversational) data. Most important is the issue of the applicability of statistical sampling methods whic...