KR19980035945A - PIP device of disc playback system - Google Patents

Abstract

A picture in picture (PIP) device of a disc playback system for displaying an input of a multi-motion picture expert group (MPEG) standard, the CD / DVD player comprising: a first decoder unit for decoding a signal reproduced from a disc; And a second decoder unit for detecting and decoding a reference image among the image signals of the type-power channel, and a display unit for overlaying the video signals output from the first decoder unit and the second decoder unit to display a plurality of screens. The contents of two type-power channels can be displayed on one screen, and there is no economic effect because no expensive MPEG decoder is added.

Description

PIP device of disc playback system

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disc reproducing apparatus, and more particularly, to a PIP device of a disc reproducing system for receiving an input of a multiple motion picture expert group (MPEG) standard.

The DVD player, which is usually used for audio / video (A / V), and the DVD-ROM, which is mainly used in a PC, are currently being commercialized in the DVD series as a new playback media.

Such a DVD player uses image data compressed by using data compressed by the current MPEG-2 standard.

This data is detected by the pickup, decoded by the decoder and then displayed on the display device for viewing by the viewer.

However, since such a disc reproducing apparatus uses only a disc as a data storage medium, only the screen reproduced on the disc can be viewed.

This general CD / DVD (CD / DVD) playback device will be described with reference to the accompanying drawings.

1 is a block diagram showing the configuration of a general CD / DVD playback device. The timing recovery of the data input from the servo unit 11 and the servo unit 11 for reading data recorded on the disc is shown. A digital signal processor (DSP) unit 12 for checking and outputting a demodulation and an error, and a first memory unit 13 for storing data necessary for performing an error check of the DSP unit 12; The MPEG decoder unit 14 receives the demodulated digital data of the DSP unit 12 and performs audio and video synchronization, and then converts and outputs the analog data into analog data, and the MPEG decoder unit 14 decodes the data. The control unit 16 controls the second memory unit 15 for storing data, and the DSP unit 12 and the MPEG decoder unit 14.

The operation of such a general CD / DVD player is first performed by the servo unit 11 reading data encoded on a disc according to the MPEG standard, detecting focus error, tracking error, and converting an analog signal into a digital signal. )

The DSP 12 receiving the digital signal for the disk performs timing recovery and demodulation under the control of the controller 16, and performs an error check by using the stored data of the first memory unit 13 so that the MPEG decoder unit ( In addition to outputting to 14), the first memory unit 13 is controlled.

Then, the MPEG decoder unit 14 performs decoding to display the MPEG 2 standard video signal processed by the DSP unit 12 on the screen under the control of the controller 16 and is processed by the DSP unit 12. The audio signal is converted into analog data and the audio stream is output in accordance with the video signal.

During CD / CVD playback of such a general CD / CVD playback apparatus, the viewer may not check satellite broadcasting or network broadcasting, and may watch only a program corresponding to the input CD / CVD.

In addition, in order to check satellite broadcasting or network broadcasting during CD / CVD playback in a general CD / CVD reproducing apparatus, an additional MPEG decoder unit needs to be added after decoding to display, thereby increasing the cost.

In general, the CD / CVD combined playback device does not perform the picture in picture viewing function currently used in analog broadcasting, and thus does not identify a type-power channel, that is, a satellite or network broadcast. .

Disclosure of Invention The present invention has been made to solve the problems according to the prior art as described above. It is an object of the present invention to provide a PIP device of a disc reproducing system which can display and confirm a screen of a plurality of type force channels on one screen. have.

1 is a block diagram showing the configuration of a typical CD / DVD (CD / DVD) playback device

2 is a block diagram showing the configuration of a PIP device of a disc reproducing system according to the present invention.

FIG. 3 is a detailed block diagram of the reference image detector of FIG. 2.

4 shows a typical GOP

5 is a view showing a PIP screen according to the present invention

* Description of the symbols for the main parts of the drawings *

21: selector 22: servo and DSP

23, 26: memory unit 24: sub-screen video signal output unit

25: MPEG decoder unit 27: Multiple display unit

28: Video DAC unit 29: Audio DAC unit

241: video data detector 242: I-frame detector

243: decoder section 244: I-frame storage section

According to an embodiment of the present invention, a selection unit of a PIP device of a disc playback system selects an input signal corresponding to a main screen by a user, and a sub-screen video signal output unit detects a reference video signal among video signals corresponding to a sub-screen. The plurality of display units may display the decoded main screen signal and the sub-screen video signal output unit by overlaying the reference video signal for the sub-screen.

Hereinafter, a PIP device of a disc reproducing system according to the present invention will be described with reference to the accompanying drawings.

FIG. 2 is a block diagram showing a configuration of a PIP device of a disc reproducing system according to the present invention, and FIG. 3 is a detailed block diagram of the reference image detector of FIG.

The configuration of the PIP device of the disc reproducing system according to the present invention as shown in FIG. 2 is characterized in that the user selects an input signal corresponding to the main screen from among the input signals and a selection unit 21. Performing an error check of the servo and digital signal processor (22) and the servo and digital signal processor (22), which reads data corresponding to the main screen, checks timing recovery, demodulation, and outputs the error. A sub-screen video signal which receives the input signal corresponding to the sub-screen by selecting the first memory unit 23 and the selection unit 21 to store necessary data for outputting the reference video signal to be displayed on the sub-screen Data required for decoding the output unit 24, the MPEG decoder 25 for decoding MPEG data corresponding to the main picture output from the servo and digital signal processor 22, and the MPEG decoder 25 And a plurality of overlaying video data of the main screen decoded by the MPEG decoder 25 and the video data corresponding to the sub-screen output from the sub-screen video signal output unit 24. The display unit 27, the video digital / analog conversion (DAC) unit 28 for converting and outputting the overlayed digital video data of the plurality of display units 27 into analog video data, and the main decoded by the MPEG decoder unit 25. An audio digital / analog conversion (DAC) unit 29 converts digital audio data of a screen into analog audio data and outputs the same.

Here, the sub-screen video signal detector 24 includes a video data detector 241 for extracting only video data from data of MPEG 2 for the sub-screen input by selection of the selector 21 as shown in FIG. An I-frame detector 242 for extracting the video data I-frames output from the detector 241, a decoder 243 for software decoding the data detected by the I-frame detector 242, and a decoder. And an I-frame storage unit 244 for storing the I-frame decoded at 243 and outputting the same in synchronization with the main picture.

The operation of the PIP device of the disc reproducing system according to the present invention configured as described above will be described with reference to the accompanying drawings.

FIG. 4 is a diagram illustrating a general GOP, and FIG. 5 is a diagram illustrating a PIP screen according to the present invention. First, whether to display a video signal reproduced by a CD / CVD as a main screen or satellite broadcasting data or network according to MPEG standards. The user inputs a selection signal to the selection unit 21 to determine whether to display data, that is, a video signal corresponding to another channel, on the main screen.

The MPEG standard data selected as the main screen through the selector 21 is input to the servo and DSP unit 22 to perform timing recovery and demodulation.

The DSP unit 22 performs an error check by using the stored data of the first memory unit 23 and outputs the error check to the MPEG decoder unit 25.

The MPEG decoder 25 decodes the MPEG-2 standard video signal processed by the servo and DSP 22 on the main screen, outputs the decoded video signal to the plurality of display units 27, and corresponds to the decoded video signal. The audio signal is output to the audio DAC unit 29 and converted into an analog audio signal.

On the other hand, the MPEG-2 standard input signal selected by the selection unit 21 is input to the video data detection unit 241 of the sub-screen video signal detection unit 24.

The video data detector 241 detects only video data among the input MPEG2 standard data and outputs the video data to the I-frame detector 242. The I-frame detector 242 detects an I-frame in the video data.

At this time, in order to enable random access in the MPEG 2 standard data encoding method as shown in FIG. 4, a GOP (Group Of Picture) unit is implemented.

The GOP unit can display 15 screens. The GOP unit can be divided into I-picture, B-picture, and P-picture units, and there is always one screen of I-picture at the head of the GOP.

The sequence header contains information about the start and end of this GOP.

Therefore, the I-frame detector 242 detects the I-frame of the GOP by detecting the start code of the sequence head.

The detected I-frame is decoded in software by the decoder unit 243, and the I-frame storage unit 244 temporarily stores the I-frames and outputs them to the plurality of display units 244 according to the synchronization signal.

The plural display unit 244 uses the video signal for the moving picture decoded by the MPEG decoder 25 as the main picture, and the video for the still picture output from the I-frame storage unit 244 of the sub picture video signal detection unit 24. Over-lap the signal to the sub picture.

That is, as shown in FIG. 5, the still picture of the I-frame detected by the sub picture video signal detector 24 is displayed on the sub picture, and the moving picture decoded by the MPEG decoder 25 is displayed on the main picture. The video signal detector 24 may be added to display a plurality of images on the main screen.

Therefore, the user can check the programs of other channels through the sub-screen even when playing the CD / CVD in the CD / CVD combined playback device. Can be checked on the subscreen.

The PIP device of the disc reproducing system according to the present invention detects only the reference image of another channel on the main screen and displays it as a sub-screen, so that the contents of a plurality of type-power channels can be displayed on one screen, and expensive It does not add an MPEG decoder, so it is economical.

Claims (6)

In a disc playback system, A first decoder for decoding a signal reproduced from the disc; A second decoder which detects and decodes a reference video in a video signal of a type force channel; And a display unit for overlaying the video signal output from the first decoder unit and the second decoder unit to display a plurality of screens. The method of claim 1, wherein the second decoder unit An I-frame detector for extracting I-frames from video data in a video signal of a type force channel; A decoder for decoding the data detected by the I-frame detector; And a storage unit for storing the I-frame decoded by the decoder unit and outputting the I-frame in synchronization with the main picture. The method of claim 1, wherein the second decoder unit A PIP device of a disc reproducing system, characterized by decoding by software. In a disc playback system, A selection unit for selecting a main picture and a sub picture from a signal reproduced from a disc or a type video signal; A decoder to decode the video signal selected as the main picture by the selector; A sub-screen video signal output unit for detecting and decoding a reference video signal of the video signal selected as the sub-screen from the selection unit; And a display unit for overlaying and displaying the video signal output from the decoder unit and the sub-screen video signal output unit. The display apparatus of claim 4, wherein the sub-screen video signal output unit An I-frame detector for extracting I-frames from video data in a video signal of a type force channel; A decoder for decoding the data detected by the I-frame detector; And an I-frame storage unit for storing the I-frame decoded by the decoder and outputting the same at the synchronization of the main picture. The method of claim 5, wherein the decoder unit A PIP device of a disc reproducing system, characterized by decoding by software.