Devices and methods for transmitting and receiving data of a sink device to change video display resolution based on error counter value detected at the sink device using HDMI

Patent metadata

Field	Value
Publication number	US-9942605-B2
Application number	US-201515125563-A
Country	US
Kind code	B2
Filing date	Mar 11, 2015
Priority date	Mar 12, 2014
Publication date	Apr 10, 2018
Grant date	Apr 10, 2018

Abstract

A method for transmitting and receiving data of a sink device by using HDMI is disclosed. A method for transmitting and receiving data of a sink device by using HDMI comprises receiving video data through at least one channel of HDMI from a source device; generating an error counter value by performing CED (Character Error Detection) on the received video data; in case the error counter value exceeds a threshold value, transmitting to the source device a CEC message requesting resolution change of the video data; and receiving video data with a resolution changed according to the CEC message from the source device.

First claim

The invention claimed is:

1. A method for transmitting and receiving data of a sink device by using a High Definition Multimedia Interface (HDMI), the method comprising:
receiving, from a source device, video data through at least one channel of the HDMI;
counting an error counter value regarding the at least one channel of the HDMI by performing Character Error Detection (CED) on the received video data;
when the error counter value is larger than a pre-configured threshold value, transmitting, to the source device, a Consumer Electronics Control (CEC) message requesting to change resolution of the received video data; and
receiving, from the source device, another video data with changed resolution according to the CEC message.

2. The method of claim 1 , further comprising:
mapping the error counter value to Status and Control Data Channel (SCDC) data.

3. The method of claim 1 , wherein the CEC message includes Video Identification Code (VIC) information indicating specific resolution to be changed for the received video data.

4. The method of claim 3 , further comprising:
storing VIC information indicating the changed resolution of the another video data,
wherein the changed resolution is configured as a default resolution for the source device.

5. The method of claim 3 , further comprising:
when the error counter value is larger than the pre-configured threshold value, outputting a User Interface (UI) including a message suggesting replacement of an HDMI cable or downgrading video resolution.

6. A sink device transmitting and receiving data by using a High Definition Multimedia Interface (HDMI), the sink device comprising:
a HDMI receiver transmitting and receiving audio/video data through the HDMI; and
a controller controlling data transmission and reception of the HDMI receiver, wherein the sink device is configured to:
receive, from a source device, video data through at least one channel of the HDMI;
count an error counter value regarding the at least one channel of the HDMI by performing Character Error Detection (CED) on the received video data;
when the error counter value is larger than a pre-configured threshold value, transmit, to the source device, a Consumer Electronics Control (CEC) message requesting to change resolution of the received video data; and
receive, from the source device, another video data with changed resolution according to the CEC message.

7. The sink device of claim 6 , wherein the sink device is configured to map the error counter value to Status and Control Data Channel (SCDC) data.

8. The sink device of claim 6 , wherein the CEC message includes Video Identification Code (VIC) information indicating specific resolution to be changed for the received video data.

9. The sink device of claim 8 , wherein the sink device is configured to store VIC information indicating the changed resolution of the another video data, and
wherein the changed resolution is configured as a default resolution for the source device.

10. The sink device of claim 8 , wherein, when the error counter value is larger than the pre-configured threshold value, the sink device is configured to output a User Interface (UI) including a message suggesting replacement of an HDMI cable or downgrading video resolution.

11. A method for transmitting and receiving data of a source device by using a High Definition Multimedia Interface (HDMI), the method comprising:
obtaining video resolution information indicating video resolution supported by a sink device, by reading Extended Display Identification Data (EDID) of the sink device;
transmitting, to the sink device, video data based on the obtained video resolution information;
receiving, from the sink device, a Consumer Electronics Control (CEC) message requesting to change resolution of the transmitted video data; and
transmitting, to the sink device, another video data with changed resolution according to the CEC message.

12. The method of claim 11 ,
wherein the CEC message includes Video Identification Code (VIC) information indicating specific resolution to be changed for the transmitted video data.

13. The method of claim 12 , wherein the changed resolution of the another video data is a downgraded resolution.

14. The method of claim 11 , further comprising:
reading a Character Error Detection (CED) error counter value corresponding to the transmitted video data from Status and Control Data Channel (SCDC) data of the sink device.

15. A source device transmitting and receiving data by using a HDMI, the source device comprising:
an HDMI transmitter transmitting and receiving data through the HDMI; and
a controller controlling data transmission and reception of the HDMI transmitter, wherein the source device is configured to:
obtain video resolution information indicating video resolution supported by a sink device, by reading Extended Display Identification Data (EDID) of the sink device;
transmit, to the sink device, video data based on the video resolution information;
receive, from the sink device, a Consumer Electronics Control (CEC) message requesting to change resolution of the transmitted video data; and
transmit, to the sink device, another video data with changed resolution according to the CEC message.

16. The source device of claim 15 ,
wherein the CEC message includes Video Identification Code (VIC) information indicating specific resolution to be changed for the transmitted video data.

17. The source device of claim 16 , wherein the changed resolution of the another video data is a downgraded resolution.

18. The source device of claim 15 , the source device is configured to read a Character Error Detection (CED) error counter value corresponding to the transmitted video data from Status and Control Data Channel (SCDC) data of the sink device.

Assignees

• Lg Electronics Inc

Inventors

• Lee Hyeonjae
• Kim Dokyun
• Park Jangwoong
• Yang Hyunsik

Classifications

• H04N21/615

  Signal processing at physical level (signal processing in analog two-way television systems H04N7/173) · CPC title

• H04N21/472

  End-user interface for requesting content, additional data or services; End-user interface for interacting with content, e.g. for content reservation or setting reminders, for requesting event notification, for manipulating displayed content {(end-user interfaces for retrieving video data from a database G06F16/739; network services for supporting unicast streaming H04L65/612)} · CPC title

• H04L1/0045

  Arrangements at the receiver end · CPC title

• H04N21/4394

  involving operations for analysing the audio stream, e.g. detecting features or characteristics in audio streams (arrangements characterised by components specially adapted for monitoring, identification or recognition of audio in broadcast systems H04H60/58) · CPC title

• H04N21/434

  Disassembling of a multiplex stream, e.g. demultiplexing audio and video streams, extraction of additional data from a video stream; Remultiplexing of multiplex streams; Extraction or processing of SI; Disassembling of packetised elementary stream {(demultiplexing of data packets for data networks, e.g. RTP/UDP H04L65/00)} · CPC title