Caption display device for digital TV and method thereof

• US 6,348,951 B1
• Filed: 02/23/2000
• Issued: 02/19/2002
• Est. Priority Date: 03/02/1999
• Status: Expired due to Term

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Kim, Man Hyo
• Primary Examiner(s): HSIA, SHERRIE Y
• Application Number:
  US09/511,311
• Time in Patent Office: 727 Days
• Field of Search: H04/N.5445, H04/N.974, H04/N.976, 348/564, 348/563, 348/569, 348/468, 348/584, 348/589, 348/598, 348/600
• US Class Current: 348/564
• CPC Class Codes: H04N 21/434 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 Class Codes: H04N 21/4348 Demultiplexing of additional data and video streams
• CPC Class Codes: H04N 21/4858 for modifying screen layout parameters, e.g. fonts, size of the windows
• CPC Class Codes: H04N 21/4884 for displaying subtitles

Abstract

A caption display device for a digital TV enables the users to adjust density of a caption window displayed on a screen of the digital TV. The caption display device for the digital TV includes: a video decoder unit for decoding an inputted MPEG II transport stream, and separately outputting a user data for caption and an MPEG II video data; an ATV caption command decoder unit for decoding the user data separated in the video decoder unit, and outputting a data having a caption command and a caption text; a user interactive control unit for sensing an interactive data inputted from the user; a caption control unit for outputting a caption text background control command in order to control a blending rate by using the user interactive signal outputted from the user interactive control unit; a blending unit for blending the ATV caption data separated in the ATV caption command decoder unit with the caption text background control command outputted from the caption control unit, and outputting a Muxing data; a video combining unit for combining and outputting the MPEG II video data separated in the video decoder unit and the Muxing data outputted from the blending unit; and a video data processing unit for processing and outputting a color blending according to the signal outputted from the video combining unit.

Claims

1. A caption display device for a digital TV, comprising:

a video decoder unit for decoding an inputted MPEG II transport stream, and separately outputting a user data for caption and an MPEG II video data;

an ATV caption command decoder unit for decoding the user data separated in the video decoder unit, and outputting a data including a caption command and a caption text;

a user interactive control unit for sensing an interactive data inputted from the user;

a caption control unit for outputting a caption text background control command in order to control a blending rate by using a user interactive signal outputted from the user interactive control unit;

a blending unit for blending an ATV caption data separated in the ATV caption command decoder unit with the caption text background control command outputted from the caption control unit, and outputting a Muxing data;

a video combining unit for combining and outputting the MPEG II video data separated in the video decoder unit and the Muxing data outputted from the blending unit; and

a video data processing unit for processing and outputting a color blending according to a signal outputted from the video combining unit.

2. The device according to claim 1, wherein the ATV caption command decoder unit comprises a header of 1 byte consisting of upper 3 bits indicating a service number and lower 5 bits indicating a size.

3. The device according to claim 1, wherein the user interactive control unit comprises a dedicated register of 8 bits or 16 bits.

4. The device according to claim 1, wherein the caption control unit outputs the caption text background control command in order to control a blending rate of 8 bits or 16 bits.

5. The device according to claim 1, wherein the blending unit blends an ATV caption packet header separated in the ATV caption command decoder unit with the ATV caption data and the caption text background control command outputted from the caption control unit, and outputs the Muxing data.

6. A caption display device for a digital TV, comprising:

an extract unit for separately extracting a user data and an MPEG II video data from an MPEG II transport stream;

a control unit for sensing an interactive data inputted from the user, and outputting a caption text background control command in order to control a blending rate;

a data processing unit for receiving the user data, outputting an ATV caption data, blending the ATV caption data with the caption text background control command, and outputting a Muxing data; and

an output unit for combining the MPEG II video data and the Muxing data, and processing and outputting a color blending.

7. A caption display method for a digital TV, comprising:

a first step for separately extracting a user data and an MPEG II video data from an MPEG II transport stream;

a second step for sensing an interactive data inputted from the user, and outputting a caption text background control command in order to control a blending rate;

a third step for receiving the user data, outputting an ATV caption data, blending the ATV caption data with the caption text background control command, and outputting a Muxing data; and

a fourth step for combining the MPEG II video data and the Muxing data, and processing and outputting a color blending.