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An Acoustic Scale Model of Stonehenge

The Sound Blog

How was it built?

The 1:12 scale model of Stonehenge in the semi-anechoic chamber at the University of Salford. The model is about 2.6m in diameter (for original was about 30m across).

Over the last 18 months I’ve been constructing a 1:12 scale model of Stonehenge. I want to better understand the ancient acoustics within the circle. By creating Stonehenge ‘Lego’ I can test how the site would have sounded in it’s various historic configurations. With so many stones displaced or missing in Stonehenge, the acoustics nowadays is very different to how it would have sounded thousands of years ago.

Basics of acoustic scale modelling

Scale models are a tried and tested technique in acoustics, with a history dating back to the 1930s [1]. For this 1:12 scale model, we shrunk all the dimensions of the structure by a factor of 12 and then tested it using sound at…

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How we Measured the Acoustic Scale Model of Stonehenge

The Sound Blog

Fig. 1. The 1:12 Acoustic Scale Model of Stonehenge. Read this blog post for more on how the model was constructed.

Impulse response

To characterise an architectural space, we measure a set of impulse response. You could measure one of these by creating a short impulsive sound and picking up the sound elsewhere on a microphone. Fig. 2 is an example from the model scale measurement for the source near the altar stone and the microphone inside the outer sarsen stones. First the sound direct from source to receiver arrives, followed quickly by a series of reflections from various stones.

Fig. 2. Impulse response, source near altar stone, microphone inside outer sarsens.

Impulsive sounds can be used, for example you can make quick room measurements by bursting a balloon. But more accurate results are obtained using a signal that sweeps through all the frequencies from low to high in a…

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Anger needs no visa

via Anger needs no visa

Anger needs no visa

Wee Ginger Dug

This week we learned two things which are a result of Brexit. Well, I say “learned”. Both of them were entirely predictable. The first is that the British government has decided to adopt draconian immigration laws which will effectively prevent low skilled workers or people who don’t possess fluency in English from coming to the UK, and so putting at risk many economic sectors which have relied upon labour from EU countries. The second is that the EU isn’t going to do the UK any favours as it negotiates a final trade deal with Brexit Britain. Greece has signalled that it could veto any trade deal with the UK unless illegally acquired cultural artifacts are returned to Greece meaning that it could refuse to consent to any deal unless the Elgin Marbles are returned to Athens. Spain has stated that it could veto a deal unless the question of Spanish…

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The Tories are conducting a war on consent and our right to choose

via The Tories are conducting a war on consent and our right to choose

The Tories are conducting a war on consent and our right to choose

Fear and Loathing in Great Britain

A little contribution from someone I’m guessing wasn’t a fan and didn’t appreciate my choice.

We are living in very dark times in which our right to be informed and to choose how we want to live and be, as human beings, is being repressed and stolen from us by those who believe they have the right to impose their will on us without our permission. This is a crime against humanity, in which people are forced to live by coercion. Nothing better demonstrates this than the DWP sanctions regime, forced compliance by deliberately depriving people of the means of survival. In our first world country that means money, which we are almost universally dependent on to survive.

We quite rightly protest the unnecessary hardships imposed, the unbelievable suffering and resultant deaths, but there is an underlying, deeper crime being committed by our ever more authoritarian government. We are being…

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Stirring up trouble

via Stirring up trouble