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A study on more realistic room simulation for far-field keyword spotting

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Document pages: 7 pages

Abstract: We investigate the impact of more realistic room simulation for trainingfar-field keyword spotting systems without fine-tuning on in-domain data. Tothis end, we study the impact of incorporating the following factors in theroom impulse response (RIR) generation: air absorption, surface- andfrequency-dependent coefficients of real materials, and stochastic ray tracing.Through an ablation study, a wake word task is used to measure the impact ofthese factors in comparison with a ground-truth set of measured RIRs. On ahold-out set of re-recordings under clean and noisy far-field conditions, wedemonstrate up to $35.8 $ relative improvement over the commonly-used (singleabsorption coefficient) image source method. Source code is made available inthe Pyroomacoustics package, allowing others to incorporate these techniques intheir work.

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