Praat sine wave speech11/23/2023 ![]() Obviously, the period T is measured in units of time, i.e. We'll learn more later about what else is going on in a signal like this. Here's about 0.025 (25 milliseconds) of a speech wave, with one of the quasi-periodic regions marked with an arrow: Real-world sounds are never perfectly periodic, though they may be pretty close to periodic - "quasi-periodic" - if we limit our attention to a small enough span of time. Of course, this presupposes that the pressure variation actually has a regular pattern of repetition, i.e. The period T is the time it takes for the same part of the wave's regular repetition to pass by our measurement point again. If we measure the pressure variation at a fixed point in time for a sinusoidal sound wave, and plot the measurements as a function of time, we get something like this: We'll consider both traveling waves, where the variation in pressure moves through the air as longitudinal or compression waves, and also in standing waves, where reflections create resonances (as in vocal tract formants). (Higher frequencies are interesting to bats, and much lower frequencies are interesting to meteorologists.) ![]() For our purposes, the transmission medium is air, and we'll be interested in variations that take place on a time scale ranging from about 1/20 of a second to about 1/20,000 of a second. ![]() How does the human vocal tract create and shape sounds? What is sound? Be able to define and calculate frequency, period, amplitude, wavelength, power.Ģ. Topics for the first sequence of lectures:ġ.
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