Download Auditory Neuroscience: Making Sense of Sound by Jan Schnupp PDF

By Jan Schnupp

An built-in evaluation of listening to and the interaction of actual, organic, and mental approaches underlying it. The booklet is supported via multimedia content material at auditoryneuroscience.com

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Spring force) required to achieve a given particle velocity. The speed of sound is high in materials that have a high acoustic impedance but a low density (essentially high spring forces and low masses). For air at ambient pressures and temperature, the speed of sound works out to about 343 m/s (equivalent to 1,235 km/h or 767 mph). , the springiness) of the air. For water, which is heavier but also much, much 42  Chapter 1 stiffer than air, the speed of sound is more than four times larger, at about 1,480 m/s (5,329 km/h or 3,320 mph).

The trade-off between time and frequency resolution is not just a problem for artificial sound analysis systems. Your ears, too, would ideally like to have both very high temporal resolution, telling you exactly when a sound occurred, and very high frequency resolution, giving you a precise spectral fingerprint, which would help you identify the sound source. Your ears do, however, have one little advantage over artificial sound analysis systems based on windowed Fourier analysis spectrograms. They can perform what some signal engineers have come to call multiresolution analysis.

But impulses may, of course, come thick and fast, causing impulse responses to overlap substantially in the resulting superposition, as in the example in the third row. This shows what might happen if the filter is excited by a form of “shot noise,” like a series of hailstones of different weights, raining down on a bell at rapid but random intervals. Although it is no longer immediately obvious, the output is still simply a superposition of lots of copies of the impulse response, each scaled and delayed appropriately according to each impulse in the input.

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