Showing papers by "Unto K. Laine published in 1992"

A real-time DSP implementation of a flute model

Abstract: A computationally efficient semiphysical time-domain model of the flute is presented. The traditional method of modeling the one-dimensional wave propagation as a transmission-line, where all the losses as well as reflection and dispersion effects have been lumped to linear filters at the ends of the line, is used. The model is excited by white noise, and the nonlinear interaction between the excitation and the tube resonator has been modeled by a static memoryless nonlinearity. The model is simple enough to be computationally efficient, but has retained many important features of a real instrument. The real-time implementation has been done on a Texas Instruments TMS320C30 floating-point signal processor using a sampling rate of 44.1 kHz. >

Famlet, to be or not to be a wavelet?

Abstract: A class of orthogonal time domain functions called famlets is introduced. Famlets are produced from their frequency domain representatives by using the inverse Fourier transform. The basic theory behind famlets and the famlet transform associated with them is formulated, and their usage in nonuniform resolution spectrum analysis is described. The similarities and dissimilarities of famlets and wavelets are discussed. >

Real-Time Implementation Techniques for a Continuously Variable Digital Delay in Modeling Musical Instruments.

Abstract: A monolithic card is formed of three plastic sheets bonded together, wherein the center sheet has a plurality of holes, each filled with a magnetic disc adapted to be axially poled. The center sheet is punched at one station, then located at a second station beneath a flexible card of magnetic material, and with its holes aligned with respective punches which simultaneously punch discs from the card and force them into holes. The center and outer sheets are stacked, and bonded under heat and pressure. The discs are magnetized with polarities at one card face distributed in a desired pattern.

Aspect of the physiological sources of vocal vibrato: A study of fundamental-period-synchronous changes in electroglottographic signals obtained from one singer and two excised human larynges

Abstract: The following experiment was carried out in order to see whether it is possible to get information about the physiological mechanisms of fundamental frequency variation in the vibrato of singing voice by investigating the fundamental-period-synchronous changes in electroglottographic signals. Electroglottograms were taken from one trained female amateur singer while singing /a:/ at comfortable pitch and loudness level in the chest register mode a) with habitual vibrato, b) with exaggerated vibrato and c) while being abruptly pushed on the abdominal wall. For a comparison, EGG-signals were taken from samples produced with two excised human larynges; in those samples fundamental frequency was changed either by varying subglottic pressure or introducing longitudinal stretch on the vocal folds by manual rotation of the cricothyroid articulation. The results suggest that only if phonation shifts from modal to falsetto register changes in amplitude, SQ and QOQ of the EGG-signal differ for laryngeally produced a...