RoSS: Rotation-induced Aliasing for Audio Source Separation

Hyungjoo Seo, Sahil Bhandary Karnoor, Romit Roy Choudhury

Research output: Chapter in Book/Report/Conference proceedingConference contribution


This paper considers the problem of audio source separation, where the goal is to isolate a target audio signal (say Alice's speech) from a mixture of multiple interfering signals (e.g., when many people are talking). This problem has gained renewed interest mainly due to the significant growth in voice-controlled devices, including robots in homes, offices, and other public facilities. Although a rich body of work exists on the core topic of source separation, we find that rotational motion of the microphones (e.g., a swiveling robot-head) offers complementary gains. We show that rotating the microphone array to the optimal orientation can produce desirable 'delay aliasing' between two interferers, causing the two interferers to appear as one. In general, a mixture of K signals becomes a mixture of (K - 1) signals, a mathematically concrete gain. We show that the gain translates well to practice, provided two rotation-related challenges can be mitigated. This paper is focused on mitigating these challenges and demonstrating the end-to-end performance on a fully functional prototype. We believe that our Rotational Source Separation (RoSS) module could be plugged into actual robot heads or into other devices (like Amazon Show) that are also capable of rotation.

Original languageEnglish (US)
Title of host publicationProceedings - ICRA 2023
Subtitle of host publicationIEEE International Conference on Robotics and Automation
PublisherInstitute of Electrical and Electronics Engineers Inc.
Number of pages7
ISBN (Electronic)9798350323658
StatePublished - 2023
Externally publishedYes
Event2023 IEEE International Conference on Robotics and Automation, ICRA 2023 - London, United Kingdom
Duration: May 29 2023Jun 2 2023

Publication series

NameProceedings - IEEE International Conference on Robotics and Automation
ISSN (Print)1050-4729


Conference2023 IEEE International Conference on Robotics and Automation, ICRA 2023
Country/TerritoryUnited Kingdom

ASJC Scopus subject areas

  • Software
  • Control and Systems Engineering
  • Electrical and Electronic Engineering
  • Artificial Intelligence


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