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Real-time auralisation system for virtual microphone positioning

机译:实时听觉化系统,用于虚拟麦克风定位

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摘要

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.
机译:开发了一种计算机应用程序来模拟录音应用程序中麦克风的定位过程。预先记录在被研究房间区域上的密集,规则的脉冲响应网格使虚拟麦克风捕获的声音通过实时卷积与代表声源的消声流进行听觉化。重叠相加方法的一个基于块的变体,其中许多小子卷积的总和产生了输出数据样本的每个块。当所应用的RIR滤波器在连续的音频输出块上变化时,将应用短暂的交叉淡入淡出以避免音频中的毛刺。所施加的脉冲响应的最大可能长度由音频处理块的大小(因此延迟)决定。该程序。较大的块可缩短每个样品的处理时间。在23.2毫秒的延迟(44.1kHz的1024个样本)下,可以在标准便携式计算机上施加9秒的脉冲响应。

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