Method for setting mute flags to improve compatibilities and the high definition multimedia interface system using the same method

1. A source device that transmits data to a sink device using: High Definition Multimedia Interface (HDMI), comprising:

a transmitter for transmitting at least one of video data, audio data and auxiliary data to the sink device; and

a controller for controlling the source device to transmit a subpacket to the sink device in response to status change of the source device such that the sink device mutes either the video signal or the audio signal,

wherein the control subpacket contains flags, one mute flag for muting the audio signal and one mute flag for muting the video signal of the sink device.

2. The source device according to claim 1 , wherein the single mute flag for audio signal comprises audio mute setting flag and audio mute clearing flag.

3. The source device according to claim 1 , wherein the single mute flag for video signal comprises video mute setting flag and video mute clearing flag.

4. The source device according to claim 1 , wherein the control signal comprises subpacket that consists of 8 bytes, SB0 through SB7.

5. The source device according to claim 1 , wherein the control signal comprises complex mute flag which controls both of audio signal and video signal and the complex mute flag is contained in SB0 and single mute flag is contained in one of SB 1 through SB 7 .

6. The source device according to claim 1 , wherein the source device is one of set-top box and DVD player, and the sink device is a digital TV.

7. A mute flag controlling method in a source device that transmits data to a sink device using High Definition Multimedia Interface (HDMI) comprising the steps of:

detecting status change of the source device;

generating the subpacket for the sink device; and

transmitting the subpacket to the sink device such that the sink device mutes either the video signal or the audio signal in response to the status change of the source device,

wherein the subpacket contains mute flags, one mute flag for muting the audio signal and one mute flag for muting the video signal of the sink device,

wherein the subpacket is generated at the source device in response to status change of the source device and contains mute flags, one mute flag for muting the audio signal and one mute flag for muting the video signal of the sink device.

8. The mute flag controlling method according to claim 7 , wherein the single mute flag for audio signal comprises an audio mute setting flag and an audio mute clearing flag.

9. The mute flag controlling method according to claim 7 , wherein the single mute flag for video signal comprises a video mute setting flag and a video mute clearing flag.

10. The mute flag controlling method according to claim 7 , wherein the control signal comprises subpacket that consists of 8 bytes, SB0 through SB7.

11. The mute flag controlling method according to claim 7 , wherein the control signal comprises complex mute flag which controls both of audio signal and video signal, and the complex mute flag is contained in SB0 and single mute flag is contained in one of SB 1 through SB 7 .

12. The mute flag controlling method according to claim 7 , wherein the source device is one of set-top box and DVD player, and the sink device is a digital TV.

13. The source device according to claim 12 , wherein the source device is one of set-top box and DVD player, and the sink device is a digital TV.

14. A sink device that receives data from source device using High Definition Multimedia Interface (HDMI), comprising:

a receiver for receiving at least one of video data, audio data, and auxilary data from the source device; and

a controller for controlling the sink device to mute either the video signal or the audio signal when the receiver receives control subpacket from the source device,

wherein the control subpacket is generated at the source device in response to status change of the source device, and contains flags, one mute flag for muting the audio signal and one mute flag for muting the video signal of the sink device.

15. The sink device according to claim 14 , wherein the single mute flag for audio signal comprises audio mute setting flag and audio mute clearing flag.

16. The sink device according to claim 14 , wherein the single mute flag for video signal comprises video mute setting flag and video mute clearing flag.

17. A mute flag controlling method in a sink device that receives data from a source device using a High Definition Multimedia Interface (HDMI), comprising the steps of:

receiving a subpacket from the source device; and

muting one of the video signal or audio signal according to the received subpacket,

wherein the subpacket is generated at the source device in response to status change of the source device and contains mute flags, one mute flag for muting the audio signal and one mute flag for muting the video signal of the sink device.

18. The mute flag controlling method according to claim 17 , further comprising:

receiving a single mute flag for clearing either video signal or audio signal from the source device; and

releasing the mute of the audio signal or the video signal according to the single mute flag.

19. The mute flag controlling method according to claim 17 , wherein the source device is one of set-top box and DVD player, and the sink device is a digital TV.