Video decoder with closed caption data on video output

• US 6,018,369 A
• Filed: 03/21/1996
• Issued: 01/25/2000
• Est. Priority Date: 03/21/1996
• Status: Expired due to Term

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Patterson, James T.
• Primary Examiner(s): RAO, ANAND SHASHIKANT
• Application Number:
  US08/619,232
• Time in Patent Office: 1,405 Days
• Field of Search: 348/423, 348/426, 348/390, 348/460, 348/461, 348/465, 348/468, 348/569, 348/473, 348/476, 348/478, 348/845.1, 348/845.2, 348/845.3
• US Class Current: 348/461
• CPC Class Codes: H04N 21/426 Internal components of the client ; Characteristics thereof H04N5/44 takes precedence
• CPC Class Codes: H04N 21/43074 of additional data with content streams on the same device, e.g. of EPG data or interactive icon with a TV program
• CPC Class Codes: H04N 21/4348 Demultiplexing of additional data and video streams
• CPC Class Codes: H04N 21/4884 for displaying subtitles
• CPC Class Codes: H04N 21/85406 involving a specific file format, e.g. MP4 format
• CPC Class Codes: H04N 7/0885 for the transmission of subtitles

Abstract

An arrangement and method for receiving a compressed video stream and generating a decompressed video signal and closed caption data therefrom employs a video decoder a video decompressor that decompresses the compressed video stream to generate a decompressed video signal. The video decoder has a closed caption data embedder that produces closed caption data contained in the compressed video stream for embedding into a video output signal of the video decoder. A single video signal output port is coupled to the video decompressor and the closed caption data embedder and produces the video output signal which includes the decompressed video signal and the embedded closed caption data.

Claims

1. A video decoder for receiving a compressed digital video stream and generating a single decompressed digital video signal with embedded closed caption digital data therefrom to be provided to an analog video encoder, the video decoder comprising:

a video decompressor that decompresses the compressed digital video stream to generate a decompressed digital video signal;

a closed caption data embedder that produces closed caption digital data contained in the compressed digital video stream for embedding into the digital video output signal; and

a single video signal output port, coupled to the video decompressor and the closed caption data embedder, producing the single digital video output signal comprising the decompressed digital video signal and the embedded closed caption digital data to be provided to the analog video encoder contemporaneously.

2. The video decoder of claim 1, further comprising a user data type detector that detects closed caption digital data in the compressed digital video stream and generates a signal to cause said closed caption data embedder to process the closed caption digital data in the compressed digital video stream.

3. The video decoder of claim 2, further comprising a user data start code detector that detects the presence of user data in the compressed digital video stream and generates a control signal in response to detection of user data, any closed caption data being contained within the user data.

4. The video decoder of claim 3, further comprising a first multiplexer that receives the compressed single digital video stream and selectively routes the compressed digital video stream to either the video decompressor or the user data type detector and the closed caption data embedder as a function of the control signal generated by the user data start code detector.

5. The video decoder of claim 4, further comprising a second multiplexer having:

a first input receiving the decompressed digital video signal from the video decompressor;

a second input receiving the closed caption digital data from the closed caption data embedder,

a single output which forms the single video signal output port, and

a select input receiving a control signal to control selection between the first and second inputs to be provided as the digital video output signal at the single video signal output port.

6. The video decoder of claim 5, wherein the video decompressor has a video synchronization signal input to slave the video decoder to external video synchronization signals.

7. The video decoder of claim 6, wherein the closed caption data embedder includes a control signal output at which the control signal received by the select input of the second multiplexer is produced.

8. The video decoder of claim 6, wherein the compressed digital video stream is in CCIR-601 format.

9. The video decoder of claim 5, wherein the second multiplexer has a third input, and further comprising a synchronization generator that generates synchronization signals that synchronize the video decompressor, start of active video and end of active video codes received at the third input of the second multiplexer, and a control signal received at the control signal input of the second multiplexer to control selection between the first, second and third inputs.

10. The video decoder of claim 9, wherein the compressed digital video stream is in CCIR-656 format.

13. The video decoder of claim 1, further comprising a multiplexer having:

a first input receiving the decompressed digital video signal form the video decompressor,

a second input receiving the closed caption digital data from the closed caption data embedder,

a single output which forms the single video signal output port, and

a select input receiving a control signal to control selection between the first and second inputs to be provided as the digital video output signal at the single video signal output port.

11. A method of converting a compressed digital video bitstream into a single digital output signal having decompressed video output with embedded closed caption data, the method comprising:

receiving a compressed digital video bitstream;

detecting closed caption digital data in the digital video bitstream;

decompressing the digital video bitstream to a decompressed digital video output;

providing the decompressed digital video output to a single output port for delivery of the single digital output signal to an analog video encoder; and

embedding the detected closed caption digital data in the decompressed digital video output to form the single digital output signal at the single output port for contemporaneous delivery of the single digital output signal to the analog video encoder.

12. The method of claim 11, wherein the step of detecting closed caption digital data includes detecting a user start code within the compressed digital video bitstream, and determining a type of user data in the compressed digital video bitstream upon detection of a user start code.

14. In a system for converting a compressed digital video input stream to an analog signal usable by a television including a transport demultiplexer receiving the compressed digital video input stream and providing an audio stream and a compressed digital video stream for processing to be usable by the television, a video decoder for receiving the compressed digital video stream and generating a decompressed digital video signal and an analog video encoder for receiving the decompressed digital video stream and generating an analog video signal for display by the television, the improvement wherein:

said video decoder generates said decompressed digital video signal including therein closed caption digital data to be provided to the analog video encoder, the video decoder comprising;

a video decompressor that decompresses the compressed digital video stream to generate a decompressed digital video signal;

a closed caption data embedder that produces closed caption digital data from the compressed digital video stream, the closed caption digital data being embedded into a digital video output signal of the video decoder; and

a single video signal output port, coupled to the video decompressor and the closed caption data embedder, the single video signal output port providing the single digital video output signal comprising the decompressed digital video signal and the embedded closed caption digital data to the analog video encoder contemporaneously.

15. The video decoder of claim 14, further comprising a multiplexer having:

a first input receiving the decompressed digital video signal from the video decompressor,

a second input receiving the closed caption digital data from the closed caption data embedder,

a single output which forms the single video signal output port, and

a select input receiving a control signal to control selection between the first and second inputs to be provided as the digital video output signal at the single video signal output port.