US 11,887,588 B2
Display device
Woojin Choi, Seoul (KR)
Assigned to LG ELECTRONICS INC., Seoul (KR)
Appl. No. 17/417,462
Filed by LG ELECTRONICS INC., Seoul (KR)
PCT Filed Jun. 20, 2019, PCT No. PCT/KR2019/007420
§ 371(c)(1), (2) Date Jun. 23, 2021,
PCT Pub. No. WO2020/256184, PCT Pub. Date Dec. 24, 2020.
Prior Publication US 2022/0059089 A1, Feb. 24, 2022
Int. Cl. G10L 15/20 (2006.01); G10L 15/22 (2006.01); G10L 21/0264 (2013.01); G10L 25/06 (2013.01); H04R 3/04 (2006.01); H04R 29/00 (2006.01)
CPC G10L 15/20 (2013.01) [G10L 15/22 (2013.01); G10L 21/0264 (2013.01); G10L 25/06 (2013.01); H04R 3/04 (2013.01); H04R 29/001 (2013.01); G10L 2015/223 (2013.01)] 17 Claims
OG exemplary drawing
 
1. A display device comprising:
an external device interface configured to connect the display device to an external speaker;
a microphone configured to receive a microphone signal; and
a controller configured to:
transmit an inaudible test signal to the external speaker to measure a signal delay between the external speaker and the display device, and
extract a voice signal by removing an acoustic signal output from the external speaker from the microphone signal based on the measured signal delay,
wherein the controller is further configured to:
in response to the external speaker not being initially connected to the display device, determine if a volume of the display device is set to zero,
in response to the volume of the display device being set to zero, transmit the inaudible test signal to the external speaker, and
in response to the volume of the display device not being set to zero, transmit the audible test signal to the external speaker.