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Real-time impulse response measurement: Swept-sine technique with minimum latency for reflection and position sensing

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State-of-the art impulse response measurement technique imposes a measurement latency that constrains real-time application. This paper proposes a first swept-sine technique that can update subsequent impulse responses within a latency of one recording sample. We verify the technique for various LTI and non-LTI measurement setups by driving a mannequin through a test room. The extracted impulse responses correspond widely to conventional swept-sine technique, while we achieve an eight times higher update rate with our implementation on a conventional laptop. The observed mean error for the LTI case is -60 dB, and builds up to -35 dB with increasing LTI violation. We anticipate, the technique can significantly improve the resolution of ultrasound sensing, monitor quick changes in reflective environment or extract impulse responses for augmented reality applications at immersive update rate.

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