KR100215812B1 - Apparatus for processing osd of digital/analog combination system - Google Patents

Abstract

Since the OSD processing device of the digital / analog combined system is provided, there are two types of OSD screens, that is, the digital mode and the analog mode. Therefore, there is a problem that the quality of the OSD data is lowered compared with the digital mode in the analog mode In order to solve the problem that OSD processing of broadcast schedule information is difficult for an analog signal source in case of having an OSD processing device of two modes, an apparatus for OSD processing video data of two image selection modes, respectively, Means for extracting only the OSD data of each mode from the image data of the mode; Means for converting the extracted OSD data into an OSD data format of the same image selection mode; Means for temporarily storing the converted OSD data of the same mode and processing the OSD data so as to be displayable according to a control signal; And a control means for providing the one control signal to enable a consistent user interface in the digital mode and the analog mode, and it is possible to perform OSD data processing of high resolution and high quality for an analog signal source, and to perform OSD processing with only one OSD processing unit It can bring down the cost and has an advantage that the OSD control is facilitated since it has one OSD processing unit.

Description

OSD processing device of digital / analog combined system

FIG. 1 is a block diagram showing an OSD processing apparatus of a digital / analog shared system according to the related art

FIG. 2 is a conceptual block diagram of an OSD processing apparatus of a digital / analog shared system according to the present invention

3 is a block diagram showing an OSD processing apparatus of a digital / analog dual-use system according to a first embodiment of the present invention

4 is a block diagram showing an OSD processing apparatus of a digital / analog dual-use system according to a second embodiment of the present invention;

5 is a block diagram illustrating an OSD processing apparatus of a digital / analog dual-use system according to a third embodiment of the present invention;

6 is a block diagram showing an OSD processing apparatus of a digital / analog combined system according to a fourth embodiment of the present invention;

7 is a block diagram showing an OSD processing apparatus of a digital / analog dual use system according to a fifth embodiment of the present invention;

DESCRIPTION OF THE REFERENCE NUMERALS

20: digital signal generator 21, 35, 53, 63, 73, 83:

22, 23: OSD data extracting unit 24: OSD data converting unit

25: digital video processing unit 26: analog video processing unit

OSD storage units 28, 39, 52c, 62c, 72d, and 88: OSD processing units 27,

29, 38, 62f, 72e, 86: switching section 30, 41, 58, 68, 77, 89:

31, 50, 60, 90, 80: channel decoders 32, 51, 61, 71, 81:

Video decoder 34, 55b, 65b, 74b, 84: frame memory

36, 64, 72a,: A / D conversion unit 40, 57, 67,

42, 56, 66, 75, 87:

The present invention relates to an A / D combined system, and more particularly, to an OSD processing apparatus of a digital / analog combined system that performs OSD data processing commonly in a digital signal source and an analog signal source.

Currently, there is a worldwide transition from analogue appliances to digital devices.

However, it will take a long time to complete the transition to digital devices. Digital devices and analog devices will coexist in the transition period.

Therefore, it is expected that digital / analog combined equipment will be a very attractive product to users during this period.

Hereinafter, an OSD (On Screen Display) processing device of a conventional digital / analog combined system will be described with reference to the accompanying drawings.

FIG. 1 is a block diagram of an OSD processing apparatus of a digital / analog dual-use system according to the related art.

Referring to FIG. 1, a configuration of a digital signal source and a processing unit for an analog signal source are shown.

Here, the digital signal source is a digital broadcast signal, and can be displayed and restored by a device such as a digital satellite broadcast receiver, a wired set top box, an ATV decoder, or the like.

The digital signal processing unit includes an antenna, a channel decoder 10, a demultiplexer 11, a video decoder 13, a storage unit 12, a format converter 17 and a control unit 14.

The antenna receives the digital broadcast signal, removes noise, and applies the digital broadcast signal to the channel decoder 10.

The channel decoder 10 filters only a transponder with respect to a bandwidth of a program to be watched according to a control signal and outputs the filtered signal to the video decoder 13.

Here, the output of the channel decoder 10 is a structure in which about 4-8 programs are time-division-multiplexed, and the demultiplexing unit 11 is an apparatus for extracting only one program to be viewed.

The output of the demultiplexer 11 is a bit stream compressed in a format such as MPEG-2 or Digicipher and is decoded in the video decoder 13 to generate digital video signals R, G , B format or Y, Cr, Cb format, etc.) format.

In this process, the storage unit 12 is used to store the image signal and OSD data.

The digital video signal format is converted into an analog video signal format (NTSC, PAL, etc.) through D / A conversion in the format converter 17.

Here, the video decoder 13 is again composed of a video decoder 13a, a video decompression unit 13b, a first OSD processing unit 13c, and an interface unit 13d.

The envelope 13a temporarily stores the output signal of the demultiplexing unit 11 and outputs it when the video signal is requested by the video decompression unit 13b.

The video decompression unit 13b decompresses the compressed bit stream outputted from the envelope 13a and stores the decompressed digital video signal in the frame memory 12b of the storage unit 12. [

The interface unit 13d performs serial communication with the control unit 14 and controls each unit in the video decoder 13 according to a control command of the control unit 14 and receives OSD data from the control unit 14, (12a).

In addition, the video decoder 13 performs digital OSD data processing.

That is, the first OSD processing unit 13c reads the digital video signal data of the frame memory 12b and the OSD data of the OSD memory 12a to switch the digital video signal data and the OSD data for each pixel, .

On the other hand, the processing unit for the analog signal source includes the analog signal source 15 and the second OSD processing unit 16.

The analog signal source 15 outputs an analog video signal as an analog type (NTSC, PAL, or SECAM) broadcast signal such as an analog TV or an analog type playback signal such as an analog VHS VCR.

The conventional OSD processing for the analog signal source 15 is performed by the second OSD processing unit 16, and switches the analog video signal and the analog OSD signal.

The video signal finally output to the display unit 19 is switched by the switching unit 18 according to the control signal of the control unit 14 and is output to the display unit 19.

Here, the controller 14 controls the video decoder 13 for controlling the program selection in the digital broadcasting, the bit string extension, and the switching of the final output in the switching unit 18 according to the input of the user will be.

At this time, the OSD processing apparatus according to the related art is separately provided with the OSD processing for the digital signal source and the OSD processing for the analog signal source.

The features of these two OSD processing methods are as follows.

The OSD process for the digital signal source is a method of digitally switching digital image signal data and OSD data for each pixel, and then converting the digital image signal data and the OSD data into an analog signal.

Therefore, since interference between adjacent pixels can be minimized, an OSD screen of high resolution and quality can be realized.

On the other hand, the OSD processing unit for the analog signal source adopts a method of analogue switching between the analog video signal and the OSD data, so that the signal is distorted at the boundary between the video signal and the OSD signal, It is difficult to expect.

Therefore, a digital / analog combined system having an OSD processing unit for a digital signal source and an OSD processing unit for an analog signal source has the following problems.

First, since there are two types of OSD screen, digital mode and analog mode, it is impossible to have a consistent user interface.

That is, since the OSD processing method of the digital mode and the analog OSD processing method are different, it is necessary to have two kinds of interfaces.

Also, in the analog mode, the quality of the OSD data is lowered compared with the digital mode.

Second, digital broadcasting provides more than 100 channels, so broadcast schedule information will be broadcasted together with future broadcasting channels so that these channels can be efficiently found.

In addition, broadcast schedule information is also broadcast in conventional analog broadcasting in order to facilitate the reservation recording in a recording / reproducing medium such as a VCR.

However, in the case of displaying the broadcast schedule information on the screen using the OSD processing apparatus, it is advantageous in the search of the desired program to display a large amount of information in one screen.

The digital mode OSD is suitable for OSD of broadcasting schedule information because it can perform high resolution and multicolor OSD, but it is not suitable for OSD output of broadcasting schedule information in case of analog mode OSD.

Therefore, in the case of having the OSD processing device of two modes, there is another problem that OSD processing of broadcast schedule information is difficult for an analog signal source.

Third, since there are two OSD processing units in one system, there is another problem that the cost of the system is increased.

Fourth, there is another problem that the OSD control becomes complicated because each OSD processing unit must be controlled by the control unit.

Accordingly, the present invention has been made to solve the above-mentioned problems occurring in the prior art, and it is an object of the present invention to provide a digital signal source and an analog signal source in which OSD processing is performed in common to maintain a consistent user interface, It is an object of the present invention to provide an OSD processing apparatus for an A / D combined system which can provide a high-quality OSD screen to both signal sources and simplify the OSD process and simplify the system.

According to an aspect of the present invention, an OSD processing unit is shared between a digital signal source and an analog signal source.

Another aspect of the present invention is to convert an output of an analog signal source into a digital signal format, switch the analog signal source from a digital signal source to a digital video signal, and then perform a common OSD processing for OSD processing of high resolution and high quality .

Another feature of the present invention is that the OSD processing unit in the video decoder is utilized by using the conventional video decoder as it is.

Another aspect of the present invention is to provide a video decoder of a new structure having two digital inputs of a first digital input from a digital signal source and a second digital input obtained by A / D conversion of an analog video signal input from an analog signal source And selecting a signal to be output from the first digital input and the second digital input, and performing a coherent OSD process.

Another feature of the present invention is to select a signal to be output from a digital input and an analog input through a video decoder of a new structure having a digital input from a digital signal source and an analog input from an analog signal source, There is a characteristic in performing.

Another aspect of the present invention is to use only one OSD processing unit by performing OSD processing on the final output.

Another feature of the present invention is that the analog OSD data is converted into digital data and stored in the OSD memory in common with the digital OSD data, while simultaneously storing an identification code for distinguishing the image selection mode (digital / analog) .

Another feature of the present invention is that a digital image signal from a digital signal source is first subjected to D / A conversion and an OSD data process is performed by switching an analog image signal input from an analog signal source.

Hereinafter, an OSD processing apparatus of an A / D combined system according to the present invention will be described with reference to a basic conceptual block diagram of the entire system of the present invention shown in FIG.

Referring to FIG. 2, the digital signal generator 20 generates a digital video signal and an OSD data signal. An analog signal generator 21 for generating analog video and OSD data signals; A digital video data processing unit 25 for converting the generated digital video signal into a displayable format; An analog video data processing unit 26 for converting the generated analog video signal into a displayable format; A first OSD data extracting unit 22 for extracting only OSD data among the digital data generated by the digital signal generating unit 20; A second OSD extracting unit 23 for extracting only OSD data among the analog data generated by the analog signal generating unit 21; An OSD data converter 24 for converting the extracted digital and analog OSD data into a single unified format; An OSD storage unit 27 for temporarily storing an identification code for distinguishing the converted OSD data from a video selection mode (digital / analog) selected by the user and outputting the identification code according to a request signal; An OSD processing unit 28 for converting the OSD data stored in the OSD storage unit 27 into a displayable format according to one control signal and outputting the OSD data; A switching unit (29) for selectively outputting the digital video signal and the analog video signal according to a single selection control signal; And a display unit 30 for displaying the OSD data output from the OSD processing unit 28 and the video signal output from the switching unit 29 on the screen.

The basic concept of the present invention is that the OSD data generated in the digital signal generator 20 and the analog signal generator 21 are converted into one and the same type as described above.

In order to store the OSD data converted into the same kind of video mode, an ID code for distinguishing the video selection mode selected by the user is stored.

In addition, the OSD processing apparatus of the present invention processes OSD data by one OSD processing unit 28, thereby providing a high-quality OSD screen, simplifying the OSD processing unit, and simplifying the OSD processing control.

Hereinafter, an OSD processing apparatus of an A / D combined system according to the present invention will be described with reference to the accompanying drawings.

[First Embodiment]

FIG. 3 is a block diagram showing an OSD processing apparatus of a digital / analog combined system according to the first embodiment of the present invention.

Referring first to FIG. 3, a configuration of the channel decoder 31 will be described. A demultiplexer 32 for extracting only one program signal according to a program selection signal among a plurality of program signals applied from the channel decoder 31; A video decoder 33 for converting the compressed bit stream output from the demultiplexer into a digital video signal format through an extension process; A frame memory (34) for storing the extended digital video signal and OSD data; An A / D converter 36 for converting an analog signal applied from an analog signal source into a digital signal; A switching unit 38 for selectively outputting the converted digital signal and the signal decoded by the video decoder 33 according to a single output control signal; A control unit 42 for providing the one program selection signal and one output signal and outputting only OSD data among digital video / OSD data applied from a digital signal source; An OSD processing unit 39 for storing OSD data output from the control unit 42, reading and switching the stored OSD data and digital image data signals output from the switching unit 38, and outputting the converted OSD data; A format conversion unit 40 for converting a digital video signal to which the digital OSD data output from the OSD processing unit 39 is added to an analog signal; And a display unit 41 for displaying a video signal to which the converted OSD data is added.

Here, the video decoder 33 includes: a chip 33a for temporarily storing video / OSD data for a program output from the demultiplexer 32 and outputting the video / OSD data according to a request signal; A video decompression unit 33b for decompressing a bit stream of the compressed video / OSD data stored in the encapsulation 33a and storing the decompressed video stream in the frame memory 34 via a data bus; And an interface unit 33c for serial communication with the control unit 42 and controlling each unit through a control bus in accordance with a control command of the control unit 42. [

The operation principle of the present embodiment will be described in detail as follows.

First, the antenna receives the digital broadcast signal, removes the noise, and applies it to the channel decoder 31.

The channel decoder 31 filters only a transponder of a bandwidth to be viewed.

That is, the output of the channel decoder 31 is a structure in which about 4-8 programs are time-division-multiplexed, and only one program to be watched is demultiplexed by the demultiplexer 32 in accordance with the program selection signal of the controller 42 And outputs it to the video decoder 33.

Here, the signal output from the multiplexing unit 32 is a bit string compressed in a format such as MPEG-2 or Digicipher.

The video decoder 33 converts the input compressed digital bit stream into a digital video signal (R, G, B format or Y, Cr, Cb format) format through an extension process.

In this process, a frame memory 34 is used to store the stretched video signal.

That is, the bit stream output from the demultiplexer 32 is temporally stored in the capsule 33a, and is output when requested by the video decompression unit 33b.

The video decompression unit 33b decompresses the compressed bit stream and records the decompressed digital video signal in the frame memory 34. [

The interface unit 33c performs serial communication with the control unit 42 and controls each unit in the video decoder 33 according to a control command of the control unit 42. [

Here, the control unit 42 controls the selection of the program in the digital broadcasting, the control of the video decoder 33 for extending the bit string, and the switching of the final output in the switching unit 38, according to the input of the user.

In addition, the control unit 42 performs a function of transmitting the OSD data to the OSD processing unit 39.

As described above, the processing for the digital signal source is performed in the antenna, the channel decoder 31, the demultiplexer 32, the video decoder 33, and the frame memory 34, Or stretches to produce a digital video signal.

The analog signal source 35 generates an analog video signal in an analog signal source 35 such as an analog TV or an analog VHS VCR in an NTSC or PAL format and outputs the analog video signal to the A / D converter 36 ) Into a digital video signal.

The switching unit 38 receives the two digital signals, switches the two signals according to the control signal of the controller 42, and outputs the signals to the OSD processing unit 39.

The OSD processing unit 39 receives the OSD data from the control unit 42 and records the received OSD data in the OSD memory 37. The OSD processing unit 39 reads the digital video signal applied from the switching unit 38 and the recorded OSD data, Signal and OSD data, and outputs the converted signal to the format conversion unit 40.

The digital video signal to which the OSD data is added is converted into an analog video signal format or the like through D / A conversion in the format conversion unit 40 and is output to the display unit 41.

Therefore, the user can view the image with OSD data added.

First, the digital signal source 35 is converted into a digital video signal having the same format as a signal obtained by decoding the digital signal source through the A / D conversion, so that the digital OSD processing unit 39 .

Second, the switching of the digital signal source and the analog signal source is performed first, and then the OSD process is performed.

Accordingly, the present embodiment provides the same user interface for the digital signal source and the analog signal source, and can provide the OSD screen much improved compared to the conventional analog type OSD processing for the analog signal source.

[Second Embodiment]

FIG. 4 is a block diagram of an OSD processing apparatus of a digital / analog dual-use system according to a second embodiment of the present invention. The same elements as those of the first embodiment of FIG. 3 will not be described do.

In the first embodiment of FIG. 3, the OSD processing unit requires a separate video decoder and a separate OSD processing unit. In contrast, in the second embodiment of FIG. 4, the conventional video decoder 52 is used as it is, And a processing unit 52c.

Hereinafter, the operation principle of the second embodiment will be described in detail with reference to the accompanying drawings.

First, the control unit 56 controls the video decoder 52 to switch between the digital signal source and the analog signal source 53.

That is, when the user selects the digital mode, the control unit 56 activates the dither 52a and the video decompression unit 52b of the video decoder 52 to extend the digital signal source, And the image data converter 54 is activated to prevent the A / D-converted digital video signal of the analog signal from being written into the frame memory 55b.

On the other hand, when the user selects the analog mode, the control unit 56 deactivates the capsule 52a and the video decompression unit 52b to prevent the digital video signal stretched from the digital signal source from being recorded in the frame memory 55b .

On the other hand, the image data converter 54 is activated to perform A / D conversion on the analog signal source 53 to obtain a digital image signal and to record the digital image signal in the frame memory 55b.

As a result, digital video signals are recorded in the frame memory 55b in both the digital mode and the analog mode, and the digital video signal data stored in the OSD processing unit 52c and the frame memory 55b are transmitted from the control unit 56, The OSD processing is digitally performed using the OSD data stored in the memory 55a.

As in the first embodiment of FIG. 3, the analog signal source 53 is A / D converted to convert the digital signal source into a digital video signal having the same format as the decoded signal, ).

In this embodiment, the frame memory 55b is appropriately controlled without the switching unit 38 in the first embodiment so that the digital video signal generated from the signal source selected by the user is recorded so that the digital OSD processing unit 52c ).

By using the OSD processing unit 52c built in the video decoder 52 as it is, cost reduction and system size can be reduced.

[Third Embodiment]

FIG. 5 is a block diagram of an OSD processing apparatus of a digital / analog dual-use system according to a third embodiment of the present invention, and a description of the same elements that are the same as those of the first embodiment and the second embodiment will be omitted .

In this embodiment, a signal to be output from the first digital input and the second digital input is selected through a video decoder 62 of a new structure having two digital inputs of a first digital input and a second digital input, And perform data processing.

An auxiliary input first interface unit 62e for converting the A / D converted digital video signal from the analog signal source into a proper format in the video decoder 62; And a switching unit 62f for selecting one of the first digital input and the second digital input according to a control command of the control unit 66 and storing the selected input in the frame memory 65b.

Here, the first digital input is a digital bit stream selected from a digital signal source, and the second digital input represents a digital video signal converted from the analog signal source 63 through the A / D converter 64.

The operation principle of the present embodiment configured as described above will be described.

First, a first digital input bit stream inputted from a digital signal source is stretched by a convolution 62a and a video stretching unit 62b to restore a digital video signal, and a switching unit 62f .

The second digital input video signal, which is A / D converted and applied from the analog signal source 63, is subjected to proper format conversion through the auxiliary input first interface unit 62e and then written to the frame memory 65b And is input to the switching section 62f.

The switching unit 62f selects one of the two inputs according to the control signal of the control unit 66 and records the selected input in the frame memory 65b.

Since the digital video signal is recorded in the frame memory 65b in both the digital mode and the analog mode, the OSD processing unit 62c transmits the digital video signal data stored in the frame memory 65b to the OSD memory 65a And the OSD process is digitally performed using the stored OSD data.

[Fourth Embodiment]

FIG. 6 is a block diagram showing an OSD processing apparatus of a digital / analog dual-use system according to a fourth embodiment of the present invention. The same elements as those of the first, second and third embodiments are omitted from the description. .

In this embodiment, the A / D conversion unit 64 and the auxiliary input interface unit 62e in the third embodiment are unified and included in the video decoder 72. [

That is, the digital input and the analog signal are inputted to the digital input / output terminal 72 through a video decoder 72 having a new structure in which a digital input having a digital bit stream selected from a digital signal source as input and an analog input outputted from an analog signal source 73 as two inputs, And to select a signal to be output from the input and perform a consistent OSD process.

The operation principle of the present embodiment having the above-described configuration will now be described.

6, a digital input, that is, a digital bit stream, input through a demultiplexer 71 is temporarily stored in a charge 72b of a video decoder 72, and a video decompression unit 72c .

The compressed digital bit stream output from the envelope 72b is stretched in the video stretching unit 72c to restore the digital signal.

The restored digital signal is input through the switching unit 72e to be written in the frame memory 74b.

The analog input from the analog signal source is A / D converted first through the A / D converter 72a of the video decoder 72, converted into a digital video signal, And 72e in the frame memory 74b.

At this time, the switching unit 72e selects one input according to the control command signal of the controller 75 among the two inputs and is recorded in the frame memory 74b.

Since the digital video signal is recorded in the frame memory 65b in both the digital mode and the analog mode, the OSD processing unit 62c transmits the digital video signal data stored in the frame memory 65b to the OSD memory 65a And the OSD process is digitally performed using the stored OSD data.

[Fifth Embodiment]

7 is a block diagram showing an OSD processing apparatus of a digital / analog dual-use system according to a fifth embodiment of the present invention, and a description of the same elements that are the same as those of the first to fourth embodiments will be omitted .

Each of the embodiments described above converts an analog video signal inputted from an analog signal source into a digital video signal first, performs an OSD process through a digital zero signal input from a digital signal source and an appropriate switching operation, The video signal is again D / A converted and displayed.

However, in the present embodiment, as shown in FIG. 7, the digital image signal input from the digital signal source is first subjected to D / A conversion by the format converting unit 85, An analog video signal is selectively output from the switching unit 86 according to the selection control signal of the control unit 87 and the OSD process is performed by adding the OSD data applied from the control unit 87 to the selected analog video signal.

That is, the OSD data processing is performed on the final output, so that only one OSD processing unit 88 is used.

It is characterized in that no separate OSD memory is added.

Hereinafter, the operation principle of the present embodiment will be described with reference to the accompanying drawings.

A program of one of a plurality of digital programs input from a digital signal source is selected and a compressed bit stream for one selected digital program is extended in a video expansion unit 82b of the video decoder 82 to generate a digital video signal And then converted into an analog video signal through the format conversion unit 85.

The control unit 87 switches the analog video signal from the analog signal source 83 and the analog video signal converted from the digital signal source in accordance with the user's input from the switching unit 86 to the output control signal And outputs it.

The OSD processing unit 88 processes the OSD data analogously to the analog video signal output from the switching unit 86 and displays the OSD data on the display unit 89.

As described above, the OSD processing apparatus of the A / D combined system according to the present invention has the following effects.

First, a consistent user interface is possible in digital mode and analog mode, and there is an advantage that high-resolution and high-quality OSD data processing can be performed on an analog signal source.

Second, since the OSD processing is performed only by one OSD processing unit, the cost can be reduced, and since there is one OSD processing unit, there is an advantage that the OSD control becomes easy.

Claims (19)

An apparatus for OSD processing image data of two image selection modes, the apparatus comprising: means for extracting only OSD data of each mode among image data of the two image selection modes; Means for converting the OSD data of the extracted two image selection modes into an OSD data format of the same image selection mode; Means for temporarily storing the converted OSD data of the same mode and processing the OSD data so as to be displayable according to a control signal; And a control means for providing the one control signal to the OSD processing unit of the A / D combined system. The apparatus of claim 1, wherein the conversion into an OSD data format of the same image selection mode is performed according to a key input signal of a user. The apparatus of claim 1, further comprising an identification code for identifying the image selection mode selected by the user in storing the converted OSD data of the same mode. The apparatus of claim 1, wherein the OSD data format of the same image selection mode is an OSD data format of an analog mode. The apparatus of claim 1, wherein the OSD data format of the same image selection mode is an OSD data format of a digital mode. The apparatus of claim 1, wherein the OSD processing means is shared by a digital signal source and an analog signal source. Means for converting a digital video / OSD data signal input from a digital signal source into an analog video / OSD data signal; Means for selectively outputting the converted video signal and an analog video / OSD data signal applied from an analog signal source according to one switching control signal; OSD data detecting means for extracting OSD data among the selected video / OSD data; OSD data storage means for temporarily storing the detected OSD data and outputting the OSD data according to a single output control signal; OSD data processing means for formatting the OSD data output from the storage means so as to be displayable; Control means for providing the one switching control signal and one output control signal; And means for displaying the manipulated OSD data and the video data output from the OSD processing unit. The apparatus of claim 7, further comprising an identification code for identifying the image selection mode selected by the user for storing the detected OSD data. 8. The apparatus according to claim 7, wherein the OSD data processing means is shared by a digital signal source and an analog signal source. Means for converting an analog video / OSD data signal applied from an analog signal source to a digital signal; Means for switching a digital video / OSD data signal applied from the converted analog signal and a digital signal source according to a switching control signal; OSD data detecting means for extracting only OSD data among the switched video / OSD data; Storage means for temporarily storing the detected digital OSD data and outputting the digital OSD data according to a single output control signal; Means for processing the digital OSD data output from the storage means in a displayable format; Means for converting the processed digital OSD data and the digital video data output from the switching means into analog video / OSD data; Means for displaying the converted analog video / OSD data; And a control means for providing the one switching control signal and one output control signal. The apparatus of claim 10, further comprising an identification code for identifying the image selection mode selected by the user in storing the detected OSD data. 11. The apparatus according to claim 10, wherein the OSD data processing means is shared by a digital signal source and an analog signal source. Demultiplexing means for extracting only one program signal according to a program selection signal among a plurality of program signals applied from a digital signal source; A video decoding means for converting the compressed bit stream output from the demultiplexing means into a digital video signal format through an extension process; Means for storing the elongated digital video signal and OSD data; Means for converting an analog signal applied from an analog signal source into a digital signal; switching means for selectively outputting the converted digital signal and the signal decoded by the video decoding means according to a single output control signal; Control means for providing the one program selection signal and one output signal and outputting only OSD data among digital video / OSD data applied from a digital signal source; OSD processing means for storing OSD data output from the control means, reading out the stored OSD data and digital image data signals output from the switching means, and switching and outputting the OSD data; Wherein the OSD data processing means comprises means for converting the digital video signal to which the digital OSD data output from the OSD data processing means is converted into an analog signal and displaying the analog video signal. The apparatus of claim 13, further comprising an identification code for identifying the image selection mode selected by the user in storing the OSD data. 14. The apparatus of claim 13, wherein the video decoding means comprises: a FIFO for temporarily storing video / OSD data for a program output from the demultiplexing means and outputting the video / OSD data according to a request signal; A video decompression unit for decompressing a bit stream of compressed video / OSD data stored in the cache and storing the decompressed bitstream in the storage means via a data bus; And an interface unit for performing serial communication with the control unit and controlling each unit through a control bus in accordance with a control command of the control unit. Demultiplexing means for extracting only one program signal according to a program selection signal among a plurality of program signals applied from a digital signal source; Video decoding means for converting the compressed video / OSD bit stream output from the demultiplexing means into a digital video signal format through an extension process; Storage means for storing the converted digital video signal format; Image data conversion means for converting analog video / OSD data applied from an analog signal source into a digital signal and determining whether the converted digital video signal is stored in the storage means according to a control signal; Control means for providing the one program selection signal and one control signal and providing the video decoding means with OSD data transmitted from a digital signal source; Format converting means for converting the digital data signal output from the video decoding means into an analog data signal; And a display means for displaying the converted analog data signal. 17. The apparatus of claim 16, wherein the storage means comprises: an OSD memory for storing OSD data; And a frame memory for storing a digital video signal. 17. The apparatus of claim 16, wherein the video decoding means comprises: a FIFO for temporarily storing video / OSD data for a program output from the demultiplexing means and outputting the video / OSD data according to a request signal; A video decompression unit for decompressing a bit stream of compressed video / OSD data stored in the cache and storing the decompressed bitstream in the storage means via a data bus; An OSD processing unit for storing OSD data applied from the control means in the storage means and reading out the stored OSD data and the extended digital video data signals output from the video decompression unit, And an interface unit for serially communicating with the control unit and controlling each unit through a control bus according to a control command of the control unit and interfacing the OSD data transmitted from the control unit to the OSD processing unit. System OSD processing device. 18. The apparatus of claim 16 or 17, further comprising an identification code for identifying the image selection mode selected by the user in storing the OSD data.