Communication device and communication method

Abstract

One embodiment provides a communication device for transmitting a video to an external device through first to third transmission lines, the communication device including: a transmission module configured to transmit first color difference information and second color difference information concerned with adjacent two pixels through the first transmission line, to transmit first luminance information concerned with one of the two pixels through the second transmission line, and to transmit second luminance information concerned with the other of the two pixels through the third transmission line.

1 . An electronic apparatus configured to communicate via a HDMI cable with an external apparatus, the electronic apparatus comprising:
 input circuitry configured to receive first encoded video data of a first format,
 wherein the first encoded video data comprises a first pixel, a second pixel, a third pixel, and a fourth pixel, the second pixel is adjacent to the first pixel, the third pixel is adjacent to the second pixel, and the fourth pixel is adjacent to the third pixel; 
   processor circuitry configured to:
 decode the first encoded video data to generate a first decoded video data; and 
 encode the first decoded video data to generate a second encoded video data of a second format, 
 wherein the second format comprises YCbCr 4:2:0, and the second encoded video data comprises (1) a first luminance value of the first pixel, (2) a second luminance value of the second pixel, (3) a third luminance value of the third pixel, (4) a fourth luminance value of the fourth pixel, (5) a first color difference value, and (6) a second color difference value; and 
   a terminal configured to transmit the second encoded video data via channels 0, 1, and 2 of the HDMI cable by transmitting the first color difference value and the second color difference value via the channel 0 within a period, and transmitting the first luminance value, the second luminance value, the third luminance value, and the fourth luminance value via the channels 1 and 2 within the period.   
     
     
         2 . The electronic apparatus of  claim 1 ,
 wherein the processor circuitry is further configured to determine whether the external apparatus indicates support for the second format,   wherein the terminal configured to transmit the second encoded video data to the external apparatus, if the external apparatus indicates support for the second format, and   wherein the terminal configured not to transmit the second encoded video data to the external apparatus, if the external apparatus does not indicate support for the second format.   
     
     
         3 . The electronic apparatus of  claim 2 ,
 wherein the processor circuitry is further configured to determine whether the external apparatus indicates support for the second format based on EDID (Extended Display Identification Data) of the external apparatus.   
     
     
         4 . The electronic apparatus of  claim 1 ,
 wherein the period is determined in accordance with at least one cycle of a TMDS (Transition Minimized Differential Signaling) clock.   
     
     
         5 . The electronic apparatus of  claim 1 , further comprising
 storage configured to store the first encoded video data,   wherein the input circuitry configured to receive the first encoded video data stored in the storage.   
     
     
         6 . The electronic apparatus of  claim 1 , further comprising
 an optical disc drive configured to read the first encoded video data stored in an optical disc.   
     
     
         7 . The electronic apparatus of  claim 1 ,
 wherein the input circuitry is further configured to receive the first encoded video data via a network.   
     
     
         8 . The electronic apparatus of  claim 1 ,
 wherein the first encoded video data comprises 4K2K video.   
     
     
         9 . The electronic apparatus of  claim 1 ,
 wherein the first encoded video data comprises a 3D video comprising a right-eye frame and a left-eye frame.   
     
     
         10 . The electronic apparatus of  claim 1 , further comprising
 a tuner to receive a television broadcasting signal of a television program.   
     
     
         11 . The electronic apparatus of  claim 1 , further comprising
 a display configured to a video of the first encoded video data.   
     
     
         12 . An electronic apparatus configured to communicate via a HDMI cable with an external apparatus, the electronic apparatus comprising:
 a terminal configured to receive encoded video data via channels 0, 1, and 2 of the HDMI cable; and   processor circuitry configured to:
 receive the encoded video data conforming to YCbCr 4:2:0 via the terminal, if the electronic apparatus indicates support for YCbCr 4:2:0,
 wherein the encoded video data comprises (1) a first luminance value of a first pixel, (2) a second luminance value of a second pixel, (3) a third luminance value of a third pixel, (4) a fourth luminance value of a fourth pixel, (5) a first color difference value, and (6) a second color difference value, the second pixel is adjacent to the first pixel, the third pixel is adjacent to the second pixel, and the fourth pixel is adjacent to the third pixel; and 
 
 decode the encoded video data to generate a decoded video data; 
   a display configured to display the video of the decoded video data,   wherein the first color difference value and the second color difference value are received via the channel 0 within a period, and   wherein the first luminance value, the second luminance value, the third luminance value, and the fourth luminance value are received via the channels 1 and 2 within the period   
     
     
         13 . The electronic apparatus of  claim 12 ,
 wherein whether the electronic apparatus indicates support for YCbCr 4:2:0 is determined based on EDID (Extended Display Identification Data) of the electronic apparatus.   
     
     
         14 . The electronic apparatus of  claim 12 ,
 wherein the period is determined in accordance with at least one cycle of a TMDS (Transition Minimized Differential Signaling) clock.   
     
     
         15 . The electronic apparatus of  claim 12 ,
 wherein the encoded video data comprises 4K2K video.   
     
     
         16 . The electronic apparatus of  claim 12 ,
 wherein the encoded video data comprises a 3D video comprising a right-eye frame and a left-eye frame.   
     
     
         17 . The electronic apparatus of  claim 12 , further comprising:
 a tuner configured to receive a television broadcasting signal of a television program; and   a selector configured to select either one of an output from the tuner and an output from the processor circuitry and provide the selected output to the display.   
     
     
         18 . A method for communicating with an external apparatus via an HDMI cable, the method comprising:
 inputting first encoded video data of a first format,
 wherein the first encoded video data comprises a first pixel, a second pixel, a third pixel, and a fourth pixel, the second pixel is adjacent to the first pixel, the third pixel is adjacent to the second pixel, and the fourth pixel is adjacent to the third pixel; 
   decoding the first encoded video data to generate a first decoded video data;   encoding the first decoded video data to generate a second encoded video data of a second format,
 wherein the second format comprises YCbCr 4:2:0, and the second encoded video data comprises (1) a first luminance value of the first pixel, (2) a second luminance value of the second pixel, (3) a third luminance value of the third pixel, (4) a fourth luminance value of the fourth pixel, (5) a first color difference value, and (6) a second color difference value; and 
   transmitting the second encoded video data via channels 0, 1, and 2 of the HDMI cable by transmitting the first color difference value and the second color difference value via the channel 0 within a period, and transmitting the first luminance value, the second luminance value, the third luminance value, and the fourth luminance value via the channels 1 and 2 within the period.   
     
     
         19 . The method of  claim 18 , further comprising
 determining whether the external apparatus indicates support for the second format,   wherein the transmitting the second encoded video data is performed, if the external apparatus indicates support for the second format, and   wherein the transmitting the second encoded video data is not performed, if the external apparatus does not indicate support for the second format.   
     
     
         20 . The method of  claim 19 , further comprising
 determining whether the external apparatus indicates support for the second format based on EDID (Extended Display Identification Data) of the external apparatus.   
     
     
         21 . The method of  claim 18 ,
 wherein the period is determined in accordance with at least one cycle of a TMDS (Transition Minimized Differential Signaling) clock.   
     
     
         22 . The method of  claim 18 , further comprising
 reading the first encoded video data from a storage,   wherein the storage stores the first encoded video data.   
     
     
         23 . The method of  claim 18 , further comprising
 reading, by an optical disc drive, the first encoded video data from an optical disc.   
     
     
         24 . The method of  claim 18 , further comprising
 receiving the first encoded video data via a network.   
     
     
         25 . The method of  claim 18 ,
 wherein the first encoded video data comprises 4K2K video.   
     
     
         26 . The method of  claim 18 ,
 wherein the first encoded video data comprises a 3D video comprising a right-eye frame and a left-eye frame.   
     
     
         27 . The method of  claim 18 , further comprising
 receiving a television broadcasting signal of a television program by a tamer.   
     
     
         28 . The method of  claim 18 , further comprising
 displaying a video of the first encoded video data on a screen.   
     
     
         29 . A method for communicating with an external apparatus via an HDMI cable, the method comprising:
 inputting encoded video data via channels 0, 1, and 2 of the HDMI cable; and
 wherein the second format comprises YCbCr 4:2:0, the encoded video data comprises (1) a first luminance value of a first pixel, (2) a second luminance value of a second pixel, (3) a third luminance value of a third pixel, (4) a fourth luminance value of a fourth pixel, (5) a first color difference value, and (6) a second color difference value, the second pixel is adjacent to the first pixel, the third pixel is adjacent to the second pixel, and the fourth pixel is adjacent to the third pixel; and 
   decoding the encoded video data to generate a decoded video data;   displaying the video of the decoded video data,   wherein the first color difference value and the second color difference value are received via the channel 0 within a period, and   wherein the first luminance value, the second luminance value, the third luminance value, and the fourth luminance value are received via the channels 1 and 2 within the period   
     
     
         30 . The method of  claim 28 , further comprising
 determining whether support for YCbCr 4:2:0 is indicated based on EDID (Extended Display Identification Data).   
     
     
         31 . The method of  claim 28 ,
 wherein the period is determined in accordance with at least one cycle of a TMDS (Transition Minimized Differential Signaling) clock.   
     
     
         32 . The method of  claim 28 ,
 wherein the encoded video data comprises 4K2K video.   
     
     
         33 . The method of  claim 28 ,
 wherein the encoded video data comprises a 3D video comprising a right-eye frame and a left-eye frame.   
     
     
         34 . The method of  claim 28 , further comprising
 receiving a television broadcasting signal of a television program by a tuner,   wherein the displaying is performed based on the television broadcasting data or the encoded video data, whichever is selected.