US 11,705,135 B2
Detection of liveness
John Paul Lesso, Edinburgh (GB)
Assigned to Cirrus Logic, Inc., Austin, TX (US)
Filed by Cirrus Logic International Semiconductor Ltd., Edinburgh (GB)
Filed on Oct. 1, 2020, as Appl. No. 17/60,339.
Application 17/060,339 is a continuation of application No. 16/156,623, filed on Oct. 10, 2018, granted, now 10,847,165.
Claims priority of provisional application 62/572,001, filed on Oct. 13, 2017.
Claims priority of application No. 1801664 (GB), filed on Feb. 1, 2018.
Prior Publication US 2021/0027791 A1, Jan. 28, 2021
This patent is subject to a terminal disclaimer.
Int. Cl. G10L 17/26 (2013.01); G10L 17/00 (2013.01); G10L 25/51 (2013.01); G10L 25/03 (2013.01); G01S 7/539 (2006.01); G01S 15/88 (2006.01); G01S 7/52 (2006.01); G01S 15/58 (2006.01); H04W 88/02 (2009.01)
CPC G10L 17/26 (2013.01) [G01S 7/52004 (2013.01); G01S 7/539 (2013.01); G01S 15/58 (2013.01); G01S 15/88 (2013.01); G10L 17/00 (2013.01); G10L 25/51 (2013.01); G10L 25/03 (2013.01); H04W 88/02 (2013.01)] 13 Claims
OG exemplary drawing
 
12. A system for liveness detection in a device, the system comprising:
at least one microphone input, for receiving an audio signal from a microphone; and
at least one transducer output, for transmitting a signal to an ultrasound, and the system being configured for:
receiving a speech signal from the at least one microphone input;
generating a control signal through the transducer output, for transmitting an ultrasound signal through a transducer of the device;
detecting a reflection of the transmitted ultrasound signal;
detecting Doppler shifts in the reflection of the generated ultrasound signal; and
identifying whether the received speech signal is indicative of liveness of a speaker based on the detected Doppler shifts,
and the method further comprising:
obtaining information about a position of the device relative to the voice source; and
adjusting the transmit power of the ultrasound signal based on the information about the position of the device relative to the voice source;
wherein adjusting the transmit power comprises increasing the transmit power when the device is moved further away from the voice source.