Audio/visual device and control method thereof

1. An audio/video (AV) device comprising:

a first signal transmitter configured to output a video signal and a first audio signal corresponding to the video signal to a display device;

a first signal receiver configured to receive a feedback signal of the first audio signal from the display device;

a second signal transmitter configured to output a second audio signal corresponding to the video signal; and

a controller configured to determine a processing delay time of the display device by comparing the first audio signal and the feedback signal, and control the second signal transmitter to delay the output of the second audio signal based on the determined processing delay time,

wherein the controller is further configured to form a mute section in the first audio signal, to detect the mute section from the feedback signal with respect to the first audio signal received from the display device, and to determine the processing delay time based on a time difference between a point of time when the mute section of the first audio signal is outputted and a point of time when the mute section is detected from the feedback signal.

2. The AV device according to claim 1 , wherein the mute section is periodically provided in the first audio signal.

3. The AV device according to claim 1 , wherein the mute section formed in the first audio signal has a pattern.

4. The AV device according to claim 1 , wherein the controller is further configured to control the first signal transmitter to output the first audio signal in response to an audio change occurring.

5. The AV device according to claim 4 , wherein the controller is further configured to determine that the audio change occurs in response to a user's input being received.

6. The AV device according to claim 4 , further comprising a second signal receiver configured to receive the video signal and the audio signal from a source device,

wherein the controller is further configured to determine that the audio change occurs in response to the received video signal or audio signal being changed.

7. The AV device according to claim 1 , further comprising a signal processor configured to process the second audio signal,

wherein the controller is further configured to control the second signal transmitter to output the second audio signal based on a processing delay time of the display device and a processing delay time of the signal processor.

8. The AV device according to claim 1 , wherein the first signal receiver complies with a Sony/Philips Digital Interface (S/PDIF) standard.

9. A method of controlling an audio/video (AV) device, the method comprising:

outputting a video signal and a first audio signal corresponding to the video signal to a display device;

receiving a feedback signal of the first audio signal from the display device;

determining a processing delay time of the display device by comparing the first audio signal and the feedback signal; and

outputting a second audio signal corresponding to the video signal, the second audio signal being delayed based on the determined processing delay time,

wherein the outputting the video signal and the first audio signal further comprises forming a mute section in the first audio signal, and

wherein the determining comprises detecting the mute section from the feedback signal with respect to the first audio signal received from the display device, and determining the processing delay time based on a time difference between a point of time when the mute section of the first audio signal is outputted and a point of time when the mute section is detected from the feedback signal.

10. The method according to claim 9 , wherein the mute section is periodically provided in the first audio signal.

11. The method according to claim 9 , wherein the mute section formed in said first audio signal has a pattern.

12. The method according to claim 9 , wherein the outputting the first audio signal comprises outputting the first audio signal in response to an audio change occurring.

13. The method according to claim 12 , wherein the outputting the first audio signal comprises determining that the audio change occurs in response to a user's input being received.

14. The method according to claim 12 , further comprising receiving the video signal and the audio signal from a source device,

wherein the outputting the first audio signal comprises determining that the audio change occurs in response to the received video signal or audio signal being changed.

15. The method according to claim 9 , further comprising processing the second audio signal,

wherein the outputting the second audio signal comprises outputting the second audio signal based on a processing delay time of the display device and a processing delay time of the second audio signal.

16. The method according to claim 9 , wherein the receiving the feedback signal comprises receiving the feedback signal complying with a Sony/Philips Digital Interface (S/PDIF) standard.