Device and method for converting format in digital TV receiver

• US 20030206242A1
• Filed: 03/23/2001
• Published: 11/06/2003
• Est. Priority Date: 03/24/2000
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Choi, Seung Jong
• Granted Patent: US 7,206,025 B2
• Time in Patent Office: Days
• US Class Current: 348/441
• CPC Class Codes: G09G 5/006 Details of the interface to the display terminal specific for a display terminal using a CRT G09G1/167; using a flat panel G09G3/2096; circuits for interfacing with colour displays G09G5/04
• CPC Class Codes: H04N 11/20 Conversion of the manner in which the individual colour picture signal components are combined, e.g. conversion of colour television standards
• CPC Class Codes: H04N 7/01 Conversion of standards , e.g. involving analogue television standards or digital television standards processed at pixel level
• CPC Class Codes: H04N 9/641 Multi-purpose receivers, e.g. for auxiliary information H04N9/642 takes precedence

Abstract

Device and method for converting a format of a video signal in a digital TV receiver is provided. Format conversion can be carried out at one chip of a format converting device, inclusive of resolution, frame rate, scanning method, aspect ratio, color space, chroma format, and gamma correction. Therefore, the digital TV receiver is made to convert a wide range of video signals inclusive of, not only a digital TV broadcasting signal, but also analog TV broadcasting signal, and computer video signal, at one chip of system block. Moreover, the digital TV receiver is made to provide a variety of standards of format converted video signals, not only to own display, but also other general video signal processing devices.

Claims

1. A device for converting a format of a video signal in a digital TV receiver comprising:

a memory;

a video signal receiving part for receiving at least on kind of video signals, and storing the received video signals to the memory;

a format detecting part for detecting format information from the received video signal;

a format converting part for converting formats of the video signal stored in the memory into output formats by using detected format information and output format information provided by a user, and storing the format converted video signal to the memory, again; and

,

a video signal forwarder for forwarding the format converted video signal.

2. A device as claimed in claim 1, further comprising a video decoder for, if the received video signal is a compressed signal, decoding the received signal stored in the memory and, then, storing the decoded video signal to the memory as the received video signal.

3. A device as claimed in claim 2, where in the video decoder is an MPEG2 MP@HL decoder.

4. A device as claimed in claim 1, wherein the format information includes a spatial resolution, a frame rate, a scanning method, an aspect ratio, a color space, a chroma format, and a gamma correction.

5. A device as claimed in claim 1, wherein the at least one video signal includes a digital TV broadcasting bitstream, an analog TV broadcasting video signal, computer video signal, and other analog/digital video signals.

6. A device as claimed in claim 5, wherein the analog TV broadcasting video signal includes an NTSC broadcasting signal, a PAL broadcasting signal and a SECAM broadcasting signal;

wherein the computer video signal includes a VGA signal, an SVGA signal and an XGA signal; and

wherein the other analog/digital video signals include a DVD signal and a set top box signal.

7. A device as claimed in claim 1, wherein the format detecting part detects format information by using a synchronizing signal of the received video signal when the received video signal has no format information.

8. A device as claimed in claim 1, wherein the user provides the format information of the received video signal to the format detecting part, manually.

9. A device as claimed in claim 1, wherein the format information is transmitted by D-connector cable.

10. A device as claimed in claim 1, wherein the video signal forwarder includes analog video output, digital video output and compressed video output such as MPEG-2 signal.

11. A method for converting a format of a video signal in a digital TV receiver, comprising the steps of:

(1) determining a received video signal of being a digital TV broadcasting signal or an external video signal;

(2) detecting input format information from the received video signal if the received video signal is the digital TV broadcasting video signal, or detecting the input format information by using a synchronizing signal of the received video signal if the received video signal is the external video signal;

(3) checking if a desired external output format is provided; and

,

(4) if the desired output format is provided, converting the format of the received video signal into the desired output format by using the detected input format information and the provided output format information.

12. A method as claimed in claim 11, further comprising the steps of when the received video signal is a compressed signal, decoding the received video signal before format conversion and providing the decoded video signal.

13. A method as claimed in claim 11, further comprising the steps of generating an analog video output, a digital video output, or a compressed video output.

14. A method as claimed in claim 11, further comprising the steps of:

checking the received video signal whether the received video signal has a video signal or not; and

,

if the received video signal has no video signal, forwarding either a background color or a preset pattern to a screen.