DeepAI AI Chat
Log In Sign Up

Multipath-enabled private audio with noise

by   Anadi Chaman, et al.

We address the problem of privately communicating audio messages to multiple listeners in a reverberant room, using a set of loudspeakers. We propose two methods based on emitting noise. In the first method, the loudspeakers emit noise signals that are appropriately filtered so that after echoing along the multiple paths in the room, they sum up and descramble to yield distinct meaningful audio messages only at specific focusing spots, while being incoherent everywhere else. In the second method, adapted from wireless communications, we project noise signals onto the nullspace of the MIMO channel matrix between the loudspeakers and listeners. Loudspeakers reproduce a sum of the projected noise signals and intended messages. Again because of the echoes, the MIMO nullspace changes between the different locations in the room. Thus the listeners at focusing spots hear intended messages, while the acoustic channel of an eavesdropper at any other location is jammed. We show using both numerical and real experiments, that with a small number of speakers and a few impulse response measurements, audio messages can be indeed be communicated to a set of listeners while ensuring negligible intelligibility elsewhere.


page 3

page 4


Cocktails, but no party: multipath-enabled private audio

We describe a private audio messaging system that uses echoes to unscram...

Filtered Noise Shaping for Time Domain Room Impulse Response Estimation From Reverberant Speech

Deep learning approaches have emerged that aim to transform an audio sig...

Audio Watermarking over the Air With Modulated Self-Correlation

We propose a novel audio watermarking system that is robust to the disto...

Optimal Order of Encoding for Gaussian MIMO Multi-Receiver Wiretap Channel

The Gaussian multiple-input multiple-output (MIMO) multi-receiver wireta...

Signaling Design for MIMO-NOMA with Different Security Requirements

Signaling design for secure transmission in two-user multiple-input mult...

Neural Audio Fingerprint for High-specific Audio Retrieval based on Contrastive Learning

Most of existing audio fingerprinting systems have limitations to be use...

Presenting a Method for Improving Echo Hiding

In this article, one of the most important methods of steganography on V...