Causing a voice enabled device to defend against inaudible signal attacks

Nirupam Roy (Inventor), Romit Roy Choudhury (Inventor), Haitham Al Hassanieh (Inventor)

Research output: Patent


A voice enabled device includes a transducer to capture multiple inaudible signals received from multiple ultrasonic speakers and audio recording electronics to process the multiple inaudible signals to generate digital output samples, which are recorded sound data comprising non-linearities from frequency-shifted versions of the multiple inaudible signals to within an audible frequency range. A processing device is to detect, within the recorded sound data, at least a portion of the non-linearities, e.g., via: comparison of the recorded sound data with expected patterns from an audible audio signal generated by human voice; and detection of non-linear variations within the recorded sound data as compared to the expected patterns. In response to the detection, the processing device is further to suppress an action programmed for response to a voice command corresponding to the recorded sound data.
Original languageEnglish (US)
U.S. patent number11264047
Filing date4/24/20
StatePublished - Mar 1 2022


Dive into the research topics of 'Causing a voice enabled device to defend against inaudible signal attacks'. Together they form a unique fingerprint.

Cite this