  We propose a novel audio watermarking system that is robust to the distortion
due to the indoor acoustic propagation channel between the loudspeaker and the
receiving microphone. The system utilizes a set of new algorithms that
effectively mitigate the impact of room reverberation and interfering sound
sources without using dereverberation procedures. The decoder has low-latency
and it operates asynchronously, which alleviates the need for explicit
synchronization with the encoder. It is also robust to standard audio
processing operations in legacy watermarking systems, e.g., compression and
volume change. The effectiveness of the system is established with a real-time
system under general room conditions.
