Real-time high-resolution delay estimation in audio communication using inaudible pilot signals

We describe the construction of inaudible pilot signals and associated receiver processing techniques that can be used in audio communication, so that an accurate estimation of the signal´s end-to-end delay can be obtained. Considering the properties of the human auditory system, we structure the pilot signal so that it is acoustically untraceable and maximizes the time accuracy of the delay estimation. We provide simulation results verifying the effectiveness of the techniques, and also demonstrate its superiority compared to systems with widely used pulses in similar schemes.