KR100248725B1 - Automatic transformation device and method for aspect ratio of digital dbs receiver - Google Patents

Abstract

The present invention enables the real-time switching of the screen aspect ratio in accordance with the aspect ratio received from the transmitting station using the aspect ratio information used in the digital device (DBS) to automatically switch the screen aspect ratio, A demultiplexer for demultiplexing and outputting PES data multiplexed by multiplexing data, a video decoder for decoding and outputting the demultiplexed PES data from the demultiplexer into compressed data and outputting the decoded data into general data, and the video decoder A screen aspect ratio decoding unit for extracting a screen aspect ratio related PES from the PES data decoded through the display, a display controller for generating a sequence header signal every PES in the screen aspect ratio PES output from the screen aspect ratio decoding unit, and an output from the display controller Aspect ratio selector An aspect ratio automatic converting apparatus and a method for converting an aspect ratio of a digital device to a 16: 9 display or a 4: 3 display are provided.

Description

Aspect ratio automatic conversion device of digital DBS receiver and its method

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a digital device (DBS) receiver, and more particularly, to automatically change the screen aspect ratio according to the aspect ratio transmitted from the transmitting station using the aspect ratio information used in the digital device (DBS). The present invention relates to an aspect ratio automatic conversion device of a digital DVD receiver and a method thereof.

In the conventional device, a receiver reads a video component descriptor in a program map table (PMT) or program guide information and informs a receiver of information about a screen aspect ratio.

That is, when the transmitting station transmits the program information to the receiver, the receiver reads the program information and displays the screen aspect ratio for the corresponding program in the receiver, and the receiver selects the screen aspect ratio accordingly.

Then, the receiver determines the screen aspect ratio displayed on the monitor according to the input command of the receiver and exports the image.

More specifically, as shown in Figs. 1 and 2, information about program organization from a transmitting station or data in which PMT (Program Map Table) and video data are multiplexed in time division is demultiplexed in the DBS receiver 1 ( 1a is demultiplexed and output to the video descriptor reader unit 1b and the video decoder unit 1c.

Then, the video descriptor reader unit 1b decodes the demultiplexed data through the demultiplexer 1a and displays the screen aspect ratio for the program to the user.

For example, if the decoding result is 16: 9 aspect ratio, the video descriptor reader 1b informs the receiver that the aspect ratio is 16: 9 aspect ratio.

In this case, the screen aspect ratio is displayed using service information without using aspect ratio information in the MPEG video stream.

On the other hand, the video decoder 1c expands the demultiplexed video data, that is, compressed video data, through the demultiplexer 1a according to the screen aspect ratio selected by the user through the video descriptor reader 1b, and then expands the video data. After decoding to form data, it is transmitted to NTSC encoder 1d.

Then, the NTSC encoder 1d encodes the video data decoded by the video decoder 1c, and finally outputs an NTSC signal and a signal for which the receiver has selected a screen aspect ratio. Accordingly, the screen aspect ratio selection switch 2 The receiver is switched according to the screen aspect ratio selection signal, and sends an image picture to the 16: 9 receiver 3 or the 4: 3 receiver 4 which has switched the NTSC signal output from the NTSC encoder 1d.

However, such a conventional DBS receiver informs the recipient according to the aspect ratio information provided by the program guide or PMT, and selects the related information, but there is a problem that the aspect ratio of the provided program guide and the actual image does not exactly match. In addition, if the program contents are suddenly changed due to the broadcasting station, it is not only possible to receive them properly at the receiver, but also does not match the actual time, so automatic conversion is not possible. there was.

Accordingly, the present invention provides a digital device for automatically switching the screen aspect ratio according to the aspect ratio received from the transmitting station by using the aspect ratio information used in the digital device (DBS). It is an object of the present invention to provide an automatic aspect ratio conversion device and a method thereof of a DBS) receiver.

The technical means of the present invention for achieving this object is a demultiplexer for demultiplexing and outputting the PES data multiplexed multiplexed from the transmitting station by time division, and the PES data demultiplexed by the demultiplexer in the form of compressed data A video decoder that receives input and decodes the data into general data, a screen aspect ratio decoding unit for extracting a screen aspect ratio related PES from the PES data decoded by the video decoder, and every PES in the screen aspect ratio PES output from the screen aspect ratio decoding unit. And a display control unit for generating a sequence header signal every time, and a screen aspect ratio selection switching unit which is switched according to an aspect ratio selection control signal output from the display control unit and switches to a 16: 9 display unit or a 4: 3 display unit. .

In addition, a method for achieving the object of the present invention includes a first process of demultiplexing the received PES data, a second process of decompressing the demultiplexed PES data in the first process to decode the general data, A fourth process of finding a sequence header start for each new PES in the decoded PES data stream and generating an aspect ratio control signal according to the aspect ratio of the sequence header; and the aspect ratio control signal of the fourth process comprises a 16: 9 aspect ratio And a fifth process of switching to a 16: 9 display and a sixth process of switching to a 4: 3 display if the aspect ratio control signal of the fourth process is a 4: 3 aspect ratio. do.

1 is a block diagram of a conventional DBS receiver;

FIG. 2 is an operation flowchart for explaining FIG. 1;

3 is a block diagram illustrating an apparatus for automatically converting an aspect ratio of a digital database receiver according to an embodiment of the present invention.

4 is a flowchart for describing an operation of FIG. 3.

<Description of the code | symbol about the principal part of drawing>

10a: demultiplexer 10b: video decoder section

10c: aspect ratio decoding unit 10d: display control unit

10e: screen aspect selector 10f: 16: 9 display

10g: 4: 3 display

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

FIG. 3 is a block diagram of an apparatus for automatically converting an aspect ratio of a digital receiver (DBS) according to an embodiment of the present invention. FIG. 4 is a flowchart illustrating an operation of FIG. 2 in which multiple data from a transmitting station are multiplexed in time division. Demultiplexer 10a for demultiplexing the data to be output and outputting PMT (Program Map Table) and video data, and information about demultiplexing video data and program formation demultiplexed at the demultiplexer 10a. A video decoder unit 10b that receives the compressed data, decodes it into general data, and outputs it; a screen aspect ratio decoder 10c that extracts only a screen aspect ratio from the data decoded by the video decoder 10b; The screen aspect ratio output from the screen aspect ratio decoding unit 10c is detected and an aspect ratio selection control signal is generated according to the detection result. The screen aspect ratio is switched according to the display controller 10d and the aspect ratio selection control signal output from the display controller 10d to switch to the 16: 9 display unit 10f or the 4: 3 display unit 10g. The receiver 10 includes a selection switching unit 10e.

Referring to Figures 3 and 4 attached to the operation and effect of the present invention configured as described above are as follows.

First, the demultiplexer 10a in the receiver 10 demultiplexes PES (Packetized Elementary Stream) data, in which several data are multiplexed in time division from a transmitting station, and at the same time, a header of a transport packer is included. ) Is then sent to the video decoder 10b.

Then, the video decoder 10b receives the demultiplexed PES data from the demultiplexer 10a, stores it in a memory, and decodes the compressed data into general data and outputs the decoded data.

Accordingly, the screen aspect ratio decoding unit 10c extracts only the screen aspect ratio from the data decoded by the video decoder 10b and outputs it to the display control unit 10d.

Then, the display control unit 10d detects the screen aspect ratio output from the screen aspect ratio decoding unit 10c and generates an aspect ratio selection control signal according to the detection result.

Accordingly, the screen aspect ratio selection switching unit 10e is switched according to the aspect ratio selection control signal output from the controller unit 10d to switch to the 16: 9 display unit 10f or the 4: 3 display unit 10g. Will be.

That is, the display control unit 10d searches for the start of the screen aspect ratio PES extracted by the screen aspect ratio decoding unit 10c, and if the PES is newly started, finds a sequence header start code in the PES stream and horizontally. After reading the size and the vertical size, the next screen aspect ratio is read.

The screen aspect ratio selection switching unit 10e is controlled in accordance with the read screen aspect ratio to automatically select the screen.

This value is recorded at a specific address in the memory so that the display control unit 10d controlling the receiver 10 can always read it.

In addition, if the stream is not newly started and the existing stream is continuously received, the screen can be automatically selected by checking the change of the screen aspect ratio while waiting for the next PES to start.

As described above, the present invention analyzes the data in the MPEG packet stream, not the video component descriptor of the program guide information, and reads information on the sequence header aspect ratio for each PES, thereby real-time switching of the screen aspect ratio. By automatically switching the screen aspect ratio, the receiver can enjoy the original image transmitted by the broadcasting station without paying special attention, and even if the program is changed without notice due to the inevitable circumstances of the broadcasting station, the receiver automatically adjusts the aspect ratio according to the change. There is a switchable effect.

Claims (2)

A demultiplexer 10a for demultiplexing data multiplexed from a transmitting station by time division and outputting information on program organization or PMT (Program Map Table) and video data; A video decoder unit (10b) which receives the demultiplexer (10a) and decomplexed video data and program information information, that is, compressed data and decodes the data into general data; A screen aspect ratio decoding unit (10c) for extracting only a screen aspect ratio from the data decoded by the video decoder (10b); A display controller unit (10d) for detecting the screen aspect ratio output from the screen aspect ratio decoding unit (10c) and generating an aspect ratio selection control signal according to the detection result; A receiver comprising a screen aspect ratio selection switching unit 10e which is switched according to the aspect ratio selection control signal output from the display controller unit 10d and is switched to a 16: 9 display unit 10f or a 4: 3 display unit 10g. Aspect ratio automatic conversion device of a digital device (DBS) receiver, characterized in that configured to include (10). Demultiplexing the received data, receiving the compressed data, decoding the received data into general data, and extracting a screen aspect ratio from the data; A second process of searching for the extracted aspect ratio of the first process and generating an aspect ratio control signal according to the search result; A third process of switching to a 16: 9 receiver if the aspect ratio control signal of the second process is a 16: 9 aspect ratio; And if the aspect ratio control signal of the second process is a 4: 3 aspect ratio, a fourth process of switching to a 4: 3 receiver to drive the aspect ratio is automatically performed.

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