Patent ID: 11887588
Assignee: LG ELECTRONICS INC.
Field: Computer technology (Electrical engineering)
Classification: CPC G  H | IPC G  H

Claim 0:
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.