Auditory Neuroscience: Making Sense of Sound by Jan Schnupp

By Jan Schnupp

An built-in evaluate of listening to and the interaction of actual, organic, and mental strategies underlying it. The publication is supported through multimedia content material at auditoryneuroscience.com

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So what do you do? Well, acoustically speaking, Christ Church cathedral is just another linear system, with reverberations, echoes, and resonances that can easily be captured entirely by its impulse response. All you need to do is make one decent “impulse” inside the cathedral. Visit the cathedral at a time when few visitors are around, clap your hands together hard and, using a portable recorder with a decent microphone, record the sound that is produced, with all its reverberation. Then use a computer to convolve the studio recorded drama with the canned Christ Church impulse response, and presto, the entire scene will sound as if it was recorded inside the cathedral.

Instead, it vibrates strongly only at its own resonance frequencies. Consequently, we can think of a struck bell or tuning fork as a sort of mechanical frequency filter. The input may contain all frequencies in equal measure, but only resonant frequencies come out. Frequencies that don’t fit the object’s mechanical tuning properties do not pass. 5, that tuning forks, bells, and other similar objects are damped. If you strike them to make them vibrate, their impulse response is an exponentially decaying oscillation.

5-ms-wide sliding Hanning window, that on the right with a much longer, 21-ms-wide window. The left spectrogram shows clearly that the sound started more or less exactly at time t = 0, but it gives limited frequency resolution. 10 The time-frequency trade-off: Short temporal analysis windows give high temporal precision but poor spectral resolution. castanet in considerably greater detail, but is much fuzzier about when exactly the sound started. The trade-off between time and frequency resolution is not just a problem for artificial sound analysis systems.

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