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Additional resources for Audio Bandwidth Extension: Application of Psychoacoustics, Signal Processing and Loudspeaker Design

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142]). In the Laplace domain, we have P (s) = s 2 ρSX(s)/(2πr). 5. 6 With a voltage or current step as the input, the displacement would be expected to reach its steady-state value in a fraction of a second, according to the traditional model. The displacement may, however, continue to increase. This phenomenon is called creep. Creep is due the viscoelastic effects (Knudsen and Jensen [145], Fl¨ugge [74]) of the spring (spider) and edge of the loudspeaker’s suspension. 11 Lumped-element model of the impedance-type analogy of an electrodynamic loudspeaker preceded by an LC high-pass crossover filter, which is not part of the actual model.

3) can be approximated by two normal distributions that correspond to the male and female voice, respectively. 5 Hz, respectively, whereas those for a female voice are twice as large. Conversational speech includes discourse as well as pause, and the proportion of actual speech periods relative to the total period is called ‘speech ratio’. In conversational speech, the speech ratio for individual talkers is about 1/3 (Furui [80]), and can be used as a feature for speech detection in a speech–music discriminator (Aarts and Toonen Dekkers [6]).

2 An infinite impulse response (IIR) filter in direct form-I structure. The input signal x(k) is filtered by the filter, yielding the output signal y(k). The boxes labeled ‘T ’ are one sample (unit) delay elements. The signal at each forward tap is multiplied with the corresponding coefficients b, while the signal in the recursive (feedback) part is multiplied with the corresponding coefficients a, respectively and the frequency response can be found by substituting z = e−i . It is obvious that an FIR filter has only zeros and no poles.

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