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TitleReal-time auralisation system for virtual microphone positioning
Author(s)Barker, Tom
Campos, Guilherme
Dias, Paulo
Vieira, José
Mendonça, Catarina
Santos, Jorge A.
Issue dateSep-2012
CitationBarker T., Campos G., Dias P., Vieira J., Mendonça C., Santos J. “Real-time auralisation system for virtual microphone positioning”. Proc. of the 15th Int. Conference on Digital Audio Effects (DAFx-12), York, UK, September 17-21, pp. 137-143, September 2012.
Abstract(s)A computer application was developed to simulate the process of microphone positioning in sound recording applications. A dense, regular grid of impulse responses pre-recorded on the region of the room under study allowed the sound captured by a virtual mi- crophone to be auralised through real-time convolution with an anechoic stream representing the sound source. Convolution was performed using a block-based variation on the overlap-add method where the summation of many small sub- convolutions produced each block of output data samples. As the applied RIR filter varied on successive audio output blocks, a short cross fade was applied to avoid glitches in the audio. The maximum possible length of impulse response applied was governed by the size of audio processing block (hence la- tency) employed by the program. Larger blocks allowed a lower processing time per sample. At 23.2ms latency (1024 samples at 44.1kHz), it was possible to apply 9 second impulse responses on a standard laptop computer.
TypeConference paper
Publisher version
AccessOpen access
Appears in Collections:CAlg - Artigos em livros de atas/Papers in proceedings
CIPsi - Comunicações

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