Capturing a space's reverb using convolution
In audio signal processing, convolution reverb is a process for digitally simulating the reverberation of a physical or virtual space. It is based on the mathematical convolution operation, and uses a pre-recorded audio sample of the impulse response of the space being modelled. To apply the reverberation effect, the impulse-response recording is first stored in a digital signal-processing system. This is then convolved with the incoming audio signal to be processed.
The primary goal of a convolution reverb is to sample real spaces, in order to simulate the acoustics of the sampled space.
Using a small Genelec monitor I played a sine sweep (12 sec, 30 sec, 60 sec) in the 6-storey stairwell that is used as a fire escape at London College of Communication. The tall enclosed nature of this space combined with hard concrete surfaces and lots of stairs create a unique and spacious reverb. 2 Fostex digital recorders were used, one to play back the sine sweep and one to record in both mono and stereo.
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Electromagnetnic Microphone
This is a journey.. into sound… Electromagnetic sound!
These mics are sold as ‘telephone pick-up coil’ for about £5 in Maplin. It’s a small pick-up coil in black plastic moulding with rubber suction pad to attach to a telephone, designed to pick up conversations for recording. Kind of like old-school spy equipment..
Anything electronic or electrical will generate a magnetic field, and this baby will pick up that signal..
..and it goes a little something like this:
- Library card reader
- Lift
- G4 Mac
- iMac
- Mobile phone
- Photocopier
- PC Laptop
- TV
- Payphone
Go get Adobe Flash Player!
Etta Ermini Dance Theatre ~ Fixed Wheel
I was commissioned to compose music and create sound design for a piece of physical dance theatre by Etta Ermini.
After initial discussions about the concept I made the decision to use only sounds recorded from bicycle parts. The chainwheel, forks, frames, wheels, brake levers and spokes became percussion, bells, gongs and were struck or bowed to create a library of samples and loops for placing into Sony Acid. You can listen to the individual cues here
Fixed Wheel is a 30 minute Physical Theatre piece for two male performers and a bicycle. It depicts the joys and pitfalls of the life and love of a geeky bike freak and his alter ego. The movement material is explosive and, at times, quirky. Dialogues are witty and acerbic. The acrobatic use of the prop, a bright blue BMX bicycle, heightens the tense atmosphere. This playful look at loss and longing aims to connect to the personal experiences of the audience. Be safe, wear a helmet!
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