Entries tagged with "audio"

Tuesday 24 March 2009

Oramics

Daphne Oram, Radiophonic Workshop founder and electronic music pioneer

This post is in honour of Ada Lovelace Day.

A big part of my fascination with electronic music is thanks to the BBC Radiophonic Workshop, which I was first exposed to as a kid via Tom Baker-era Doctor Who (I’ve written here previously about Delia Derbyshire’s arrangement of the theme) and the original Hitch-Hiker’s Guide to the Galaxy radio series, which creator Douglas Adams conceived of in part as a radio play with the production values of a modern rock album. I learned later that they provided sound effects for The Goon Show and other BBC dramas.

But where did they come from? Who came up with the idea of a room tucked away in the Maida Vale Studios whose express purpose was to birth previously unimaginable sounds?

Daphne Oram (photo: BBC)The answer: Daphne Oram. As a teenager she had become a studio engineer at the BBC, entering the traditionally male domain during the height of WWII. Her duties included balancing sound levels and “shadowing” broadcasts from the Albert Hall during the Blitz, keeping a disc of the same piece synchronized to allow the music to play on even if the concert was interrupted by German bombs.

Later, when audio tape recorders came to the UK, she spent nights hauling the machines together to work on projects before returning them to their various studios in the morning. Excited by the possibilities of tape and electronics as composing tools, she lobbied for a dedicated studio for such experiments, and at last in 1958 the BBC established the Radiophonic Workshop with Daphne Oram as its first studio manager.

It was her hope that the new studio would be a centre for art music, but to her disappointment, the music department regarded the Workshop merely as a source of background music and funny noises. She resigned in 1959, though her work there would be the inspiration for those who followed in her footsteps—and for generations of viewers and listeners who grew up hearing their work.

Meanwhile, Daphne Oram went freelance, setting up a studio, which she called Tower Folly, at a farm in Kent. There, she worked on soundtracks and commercial pieces as well as concert pieces, and began work devising a sound synthesis system which she called “Oramics”. It used patterns on 35mm film to generate and shape sounds—essentially an early method of creating sound graphically. (If you have RealPlayer, the BBC’s tribute has a great audio clip from 1972 of Ms Oram demonstrating her invention.)

IMAGEShe also wrote An Individual Note of Music, Sound and Electronics, a playful and eccentric little volume that mingles circuit diagrams, metaphysical musings, electronic music history, and design notes for the Oramics system, which she hopes is a step toward more “humanised” machine interfaces. It’s long out of print, but Dan Pope of the band Gusset has posted a scanned PDF version.

Paradigm Discs have released a two-CD set of Daphne Oram’s work called simply Oramics—the page includes a few downloadable MP3s. Her piece Four Aspects also saw release this year on the Sub Rosa compilation An Anthology of Noise and Electronic Music, Vol. 2. It’s currently the only piece you’ll find on iTunes. Her commercial pieces are light and blippy, perhaps a little reminiscent of her contemporary Raymond Scott’s, while some of the longer, “serious” pieces are moody and introspective, foreshadowing the ambient music of later decades. Here’s hoping for more re-releases to come.

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Wednesday 24 October 2007

Fractal music

Wanted: self-similar audio waveform generation

I’ve been listening to a podcast from last year featuring Will Wright and Brian Eno, talking about generative art, and it gave me an interesting idea.

There have been a lot of attempts at so-called “fractal music” (here’s a bunch of links to several such projects), but all the ones I’ve heard just take a chunk of data from, say, the Mandelbrot set, and map it to one musical scale or another. It’s hard to really hear any self-similarity happening.

Which seems a lost opportunity. Think about it: sound waveforms themselves have fractal properties, because phenomena like vibration, resonance and oscillation happen on all physical scales. Speed up a thumping rhythm far enough and eventually it turns into a tone. And any waveform can theoretically be expressed as a mix of sine waves of different pitches. Fractal generation software lets you zoom in and out to see different fractals in near-infinite detail. What if we could do the same by speeding up or slowing down a piece of audio?

A big challenge, of course, would the problem of resolution. Whether you’re working with analog or digital audio, as you slow it down you’ll eventually start to lose detail in the high frequencies, until it all goes muddy. It’s akin to blowing up a photograph, until all you can see is the grain, or a bunch of great big pixels - or conversely, shrinking it until you run out of photograph. You could always pack in more data to describe a chunk of sound, but you’d end up with a gigantic file, and you’d always hit a wall somewhere. For best results the sound from our hypothetical audio-fractal would have to be computed on the fly.

Not a new idea, but as far as I know no one’s done it yet. There’s an entry for something called “All-Music-Set Player” at Halfbakery (a “communal database of original, fictitious inventions”) which is pretty close to the mark. I’m not interested in generating all music, just creating interesting sounds to explore.

Controls: speed, perhaps other parameters like density or default shape. It’d be interesting to work in some sort of “scrub” control too.

Issues: what language to write such a thing in? How do you describe the waveform? (some sort of generative grammar that sums wavelets?) How do you set up such a generator so that you can calculate a value for a sample at an arbitrary point on the time axis? Is it even possible? The fact that I can’t find any examples of fractal audio generators makes me wonder if the obstacle is simply one of processing power…

(The podcast that sparked all this, by the way, is from a seminar series put on by the Long Now Foundation: Ogg | MP3 | text summary I’m afraid of Spore. I think it might eat me.)

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