Multi-screen display apparatus and method for digital broadcast receiver

A multi-screen display method for a digital broadcast receiver, comprising:

• receiving data bursts of a primary service channel and at least one secondary service channel by predetermined time duration;
• extracting video and audio data from the received data bursts;
• decoding the extracted video and audio data corresponding to the primary service channel and the at least one secondary service channel, with all types of video frames being decoded for the primary service channel, and only at least one predetermined type of video frame being decoded for the at least one secondary service channel selected from the group of i) only I-frames and ii) only I- and P-frames;
• storing the extracted video data in corresponding buffers, a first buffer for storing the video data of the primary service channel and at least one second buffer for storing the video data of a corresponding secondary service channel, wherein the at least one second buffer is sized dependent upon types of video frames of the at least one secondary service channel;
• multiplexing the extracted video data corresponding to the primary service channel and the at least one secondary service channel;
• displaying the multiplexed video data corresponding to the primary service channel and the at least one secondary service channel in the form of a multiplexed screen image;
• outputting the audio data of the primary service channel in synchronization with the video data of the primary service channel;
• and
• displaying a frame selection option for the at least one secondary service channel enabling user selection of a first frame option in which only I-frames are displayed, a second frame option in which only I- and P-frames are displayed, and a third frame option enabling user selection of a specific temporally positioned frame in a frames per second sequence to be displayed.

A multi-screen display apparatus for a mobile terminal equipped with a digital broadcast receiver, comprising:

• the digital broadcast receiver comprising:
• a broadcast reception unit for receiving data of a primary service channel and at least one secondary service channel in a time frame,
• a protocol processing unit for extracting video data from the received data,
• a decoding unit comprising:
• a video decoder for decoding video data of all types of video frames of the primary service channel and only at least one predetermined type of video frame of the at least one secondary service channel;
• and
• a multiplexed screen processing unit for multiplexing video data output by the decoding unit;
• a radio frequency unit for supporting radio communication;
• a control unit for controlling the radio frequency unit to process a call received while the multiplexed screen processing unit generates and outputs a multiplexed screen image in a multi-screen display mode;
• a display unit for displaying the multiplexed video data, output by the multiplexed screen processing unit, in the form of a multiplexed screen image, with a secondary service channel screen displayed in the form of a picture-in-picture (PIP) inset screen;
• and
• wherein when the secondary screen displayed in the form of the PIP inset screen is selected and an outgoing call is requested, the control unit controls the radio frequency unit to establish a communication channel on the basis of information provided through the secondary service channel associated with the selected secondary screen.

A multi-screen display method for a digital broadcast receiver, comprising:

• receiving data bursts of a primary service channel and at least one secondary service channel by predetermined time duration;
• extracting video and audio data from the received data bursts;
• determining whether the video data of the at least one secondary service channel is at least one predetermined type of video frame every time duration, selected from the group of:
• i) only I-frames and ii) only I- and P-frames;
• when the video data of the at least one secondary service channel is the predetermined type of video frame,
• decoding the video data of the primary service channel and the at least one secondary service channel and the audio data of a predetermined service channel,
• storing the decoded video data of the primary service channel in a first buffer;
• storing the decoded video data of the at least one secondary service channel in a corresponding second buffer sized dependent upon the predetermined type of video data in the at least one secondary service channel;
• multiplexing the decoded video data of the primary service channel and the at least one secondary service channel, and
• displaying the video data of the primary service channel and the at least one secondary service channels in the form of a multiplexed screen image, with a secondary service channel screen displayed in the form of a picture-in-picture (PIP) inset screen;
• when the video data of the at least one secondary service channel is not the predetermined type of video frame,
• decoding only the video and audio data of the primary service channel, and
• displaying the video data of the primary service channel;
• outputting the audio data of the primary service channel in synchronization with the video data of the primary service channel;
• detecting a selection of the secondary service channel screen displayed in the form of the PIP insert screen and an outgoing call request, and in response, establishing a communication channel on the basis of information provided through the secondary service channel associated with the selected secondary screen.

A multi-screen display method for a digital broadcast receiver, comprising:

• receiving data of a primary service channel and at least one secondary service channel;
• extracting video and audio data from the received data,
• decoding the video data of the primary and secondary service channels in a unit of a video frame, wherein all types of video data are decoded for the primary channel, and only at least one predetermined type of video data is decoded for the at least one secondary service channel selected from the group of:
• i) only I-frames and ii) only I- and P-frames;
• multiplexing the decoded video data of the primary service channel and the at least one secondary service channel,
• displaying the decoded video data of the primary service channel and the at least one secondary service channel in the form of a multiplexed screen image, and outputting the decoded audio data;
• and
• displaying a frame selection option for the at least one secondary service channel enabling user selection of a first frame option in which only I-frames are displayed, a second frame option in which only I- and P-frames are displayed, and a third frame option enabling user selection of a specific temporally positioned frame in a frames per second sequence to be displayed.

A multi-screen display method for a mobile terminal equipped with a digital broadcast receiver, comprising:

• receiving data bursts of a primary service channel and at least one secondary service channel by predetermined time duration,
• extracting video and audio data from the received data bursts,
• decoding the video data of the primary and secondary service channels in a unit of a video frame, wherein all types of video data are decoded for the primary channel, and only at least one predetermined type of video data is decoded for the at least one secondary service channel selected from the group of:
• i) only I-frames and ii) only I- and P-frames;
• storing the decoded video data of the at least one secondary service channel in a corresponding buffer sized dependent upon the predetermined type of video data in the at least one secondary service channel;
• multiplexing the decoded video data of the primary service channel and the at least one secondary service channel,
• displaying the decoded video data of the primary service channel and the at least one secondary service channel in the form of a multiplexed screen image of selectable screens, and outputting the audio data;
• displaying a frame selection option for the at least one secondary service channel enabling user selection of a first frame option in which only I-frames are displayed, a second frame option in which only I- and P-frames are displayed, and a third frame option enabling user selection of a specific temporally positioned frame in a frames per second sequence to be displayed;
• resizing the video data of the at least one secondary service channel in accordance with a size set by a user, with a position of the at least one secondary screen determined according to a user command;
• when an incoming call is detected in the multi-screen display mode, displaying information about a caller and an incoming call alert;
• and
• when an outgoing call request is detected in the multi-screen display mode, transmitting a call request.