Interfacing system for stream source apparatus and display apparatus and interfacing method thereof

An interfacing method and system for a stream source apparatus and a display device, which includes a stream source apparatus receiving analog/digital signals from external analog/digital equipments to generate a plurality of transmission packet streams corresponding to the analog/digital signals, the stream source apparatus synthesizing a plurality of the transmission packet streams into a single synthesized transmission packet stream to transmit the synthesized transmission packet stream by wireless, a display apparatus receiving the synthesized transmission packet stream transmitted from the stream source apparatus, the display apparatus separating the synthesized transmission packet stream into a transmission packet stream corresponding to a main screen and a transmission packet stream corresponding to a sub-screen, the display apparatus decoding the transmission packet streams corresponding to the main screen and the sub-screen respectively to generate digital video/audio signals to display on a display screen by a PIP form.

This application claims the benefit of the Korean Patent Application No. P2002-05940 filed on Feb. 1, 2002, which is hereby incorporated by reference.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to an interfacing system for stream source apparatus and display apparatus and an interfacing method thereof which have the stream source apparatus synthesize to transform a plurality of transmission packet streams into a single synthesized transmission packet stream form to transmit by wireless and have the display apparatus receive the synthesized transmission packet stream to display on a screen as a PIP (picture in picture) form.

2. Description of the Related Art

Recent electronic technology developments contribute to the developments of various flat panels display (FPD) devices. In a display device such as a TV screen and a monitor, the flat panel display device replaces a cathode ray tube due to its features and advantages of lightweight, thin design, and the like to employ as a display screen for representing a predetermined image.

A plasma display panel (PDP) using photo-luminescence (PL) as a florescent material, a field emission display device (FED) using cathode luminescence (CL), a liquid crystal display device (LCD), an organic electroluminescent display device, and the like are employed as flat panel display devices in various fields.

In such flat panel display devices, the PDP has such features and advantages as high brightness, high luminescence ratio, low unit cost of production, excellent characteristics of heat & cold resistance, feasibility of full color implementation, and lightweight. Hence, the PDP is equipped with a large size screen and is widely used as a display screen for a display device for TV set, computer monitor, or the like.

Moreover, the display device used as the display screen of the PDP has the feature and advantage of thin design and lightweight, thereby being under development for a wall TV.

The display device using the PDP receives video and audio signals from a stream source apparatus such as a set-top box to output video and audio. For this purpose, the display and stream source device according to the related art are constructed to transmit/receive the video and audio signals of the stream source apparatus through a wire as well as transmit/receive a predetermined control signal through the wire.

FIG. 1illustrates a diagram of an interfacing system for stream source device and display device according to a related art.

Referring toFIG. 1, an interfacing system for a stream source device and a display device, like a wall monitor or a wall TV, includes a wall display device10using a PDP as a display screen, a digital unit20outputting a transmission packet stream corresponding to digital video and audio signals by playing a predetermined play media such as a digital VTR (video tape recorder), a DVD (digital versatile disc) player, or the like, an analog unit30outputting analog video and audio signals like a VTR, a computer system, or the like by playing a play media such as video tape or the like, and a stream source device40receiving a digital broadcast signal as well as the transmission packet stream outputted from the digital unit20and the analog video and audio signals outputted from the analog unit30to switch selectively like a set-top box, the stream source device40transmitting the switched signals to the display device10.

In the interfacing system, the digital unit20is connected to the source stream source device40through a wire such as IEEE 1394 cable.

The interfacing system for the above-constructed display and stream source device according to a related art is explained in detail as follows.

First of all, the digital unit20formats the digital video and audio signals attained by playing the predetermined play media into the transmission packet stream to output, and the outputted transmission packet stream is transmitted to the stream device40through the wire such as IEEE 1394 cable.

Meanwhile, the analog unit30plays the predetermined play media to generate the analog video and audio signals, and then transmits the generated analog video signals such as R/G/B signals and the analog audio signals to the stream source device40through the wire. In this case, the analog unit30is connected to the stream source device40through an exclusive cable.

The stream source device40directly receives the digital broadcast signal through a built-in ATSC tuner or the like. In this case, the received digital broadcast signal includes the transmission packet stream corresponding to the digital video and audio signals.

Moreover, the stream source device40transforms the transmission packet stream inputted from the digital unit20into the analog video and audio signals, switches the transformed analog video and audio signals or the inputted analog video and audio signals transmitted from the analog unit30selectively, and transmits the switched analog video and audio signals to the display device10.

In this case, the stream source device40transmits the analog R/G/B signals and audio signals of L and R channels to the display device10through the respective cables or a single exclusive cable.

However, connected to the various units through the wire(s), the display device10requires a plurality of input terminals.

Moreover, when the display device10connected to the stream source device40through the predetermined cable is hung on a wall, the cable is exposed between the display device10and the stream source device40to defile the appearance of installation.

Recently, in order to overcome the above-explained problems, apparatuses for connecting the display device10to the stream source apparatus are under development.

In this case, the stream source device40compresses various video/audio signals into a transmission packet stream form to transmit by wireless, and the display device10receives to process the transmitted transmission packet stream. And, a predetermined control signal and a predetermined response signal can be transmitted by wireless between the display and stream source device10and40.

However, transmitting the transmission packet stream corresponding to a predetermined video/audio signal by wireless, the stream source device40enables to transmit the transmission packet stream corresponding to a single video/audio signal only.

Even if the display device10is equipped with a PIP function, the stream source device40enables to the transmission packet stream corresponding to the single video/audio signal only. Hence, the display device10is unable to perform the PIP function, whereby a user fails to watch at least two images on the screen.

SUMMARY OF THE INVENTION

Accordingly, the present invention is directed to an interfacing system for stream source apparatus and display apparatus and an interfacing method thereof that substantially obviate one or more problems due to limitations and disadvantages of the related art.

An object of the present invention is to provide a stream source apparatus synthesizing to transform a plurality of transmission packet stream into a single synthesized transmission packet stream form to transmit a display apparatus by wireless.

Another object of the present invention is to provide a display apparatus which receives to separate the transmission packet stream, which is synthesized and transmitted by wireless from the stream source apparatus, into a plurality of transmission packet streams and processes a plurality of the transmission packet streams with PIP to display on a screen.

A further object of the present invention is to provide an interfacing method for stream source apparatus and display apparatus enabling to have the stream source apparatus carry out a corresponding operation according to a remote control signal by having the display apparatus receive the remote control signal by a user's operation of a remote controller and having the display apparatus transmit the received remote control signal to the stream source apparatus by wireless.

To achieve these objects and other advantages and in accordance with the purpose of the invention, as embodied and broadly described herein, an interfacing system for a stream source apparatus and a display apparatus according to the present invention includes a stream source apparatus receiving analog/digital signals from external analog/digital equipments to generate a plurality of transmission packet streams corresponding to the analog/digital signals, the stream source apparatus synthesizing a plurality of the transmission packet streams into a single synthesized transmission packet stream to transmit the synthesized transmission packet stream by wireless and a display apparatus receiving the synthesized transmission packet stream transmitted from the stream source apparatus, the display apparatus separating the synthesized transmission packet stream into a transmission packet stream corresponding to a main screen and a transmission packet stream corresponding to a sub-screen, the display apparatus decoding the transmission packet streams corresponding to the main screen and the sub-screen respectively to generate digital video/audio signals to display on a display screen by a PIP form.

Preferably, the stream source apparatus includes a transmission packet stream generating unit receiving the analog/digital signals from the external analog/digital equipments to generate a plurality of the transmission packet streams, a digital switching unit selecting a plurality of the transmission packet streams to be multiplexed from a plurality of the transmission packet streams generated from the transmission packet stream generating unit, a transmission packet stream multiplexing unit synthesizing a plurality of the transmission packet streams selected by the digital switching unit into the single synthesized transmission packet stream, a memory storing the synthesized transmission packet stream of the transmission packet stream multiplexing unit, a transmission packet stream processing unit judging whether the synthesized transmission packet stream stored in the memory exceeds a previously set amount or not, a wireless transmitting/receiving unit reading the synthesized transmission packet stream stored in the memory if the synthesized transmission packet stream stored in the memory exceeds the previously set amount, the wireless transmitting/receiving unit modulating the read synthesized transmission packet stream into a radio frequency signal to transmit by wireless, and a central processing unit controlling operations of the respective units.

More preferably, the transmission packet stream generating unit includes a digital broadcast signal receiving unit receiving a digital broadcast signal from an external antenna to transform into a transmission packet stream form to output, a digital video/audio signal receiving unit receiving digital video/audio signals as a transmission packet stream from the external digital equipment, a plurality of analog signal receiving units receiving analog video/audio signals from the external analog equipments, and an MPEG encoder transforming the analog video/audio signals outputted from the analog signal receiving units into the transmission packet stream from.

Preferably, the display apparatus includes a wireless transmitting/receiving unit receiving the synthesized transmission packet stream transmitted by wireless from the stream source apparatus, a memory storing the synthesized transmission packet stream received from the wireless transmitting/receiving unit, a transmission packet stream processing unit judging whether the synthesized transmission packet stream stored in the memory exceeds a previously set amount or not, a PIP processing unit, if the transmission packet stream processing unit judges that the synthesized transmission packet stream stored in the memory240exceeds the previously set amount, reading to separate the synthesized transmission packet stream stored in the memory, the PIP processing unit processing the separated transmission packet stream by PIP, and a central processing unit receiving the synthesized transmission packet stream to control operations of the respective units.

In another aspect of the present invention, a stream source apparatus includes a transmission packet stream generating unit receiving analog/digital signals from external analog/digital equipments to generate a plurality of transmission packet streams corresponding to the analog/digital signals, a digital switching unit selecting a plurality of the transmission packet streams to be multiplexed from a plurality of the transmission packet streams generated from the transmission packet stream generating unit, a transmission packet stream multiplexing unit synthesizing a plurality of the transmission packet streams selected by the digital switching unit into a single synthesized transmission packet stream, a memory storing the synthesized transmission packet stream of the transmission packet stream multiplexing unit, a transmission packet stream processing unit judging whether the synthesized transmission packet stream stored in the memory exceeds a previously set amount or not, a wireless transmitting/receiving unit reading the synthesized transmission packet stream stored in the memory if the synthesized transmission packet stream stored in the memory exceeds the previously set amount, the wireless transmitting/receiving unit modulating the read synthesized transmission packet stream into a radio frequency signal to transmit by wireless, and a central processing unit controlling operations of the respective units.

In a further aspect of the present invention, a display apparatus includes a wireless transmitting/receiving unit receiving a synthesized transmission packet stream transmitted by wireless from a stream source apparatus, a memory receiving to store the synthesized transmission packet stream therein, a transmission packet stream processing unit judging whether the synthesized transmission packet stream stored in the memory exceeds a previously set amount or not, a PIP processing unit, if the transmission packet stream processing unit judges that the synthesized transmission packet stream stored in the memory exceeds the previously set amount, reading to separate the synthesized transmission packet stream stored in the memory, the PIP processing unit processing the separated transmission packet stream by PIP, and a central processing unit receiving the synthesized transmission packet stream to control operations of the respective units.

In another further aspect of the present invention, an interfacing method for stream source apparatus and display apparatus includes a judging step of judging whether a remote control signal inputted to a display apparatus in accordance with a user's operation of a remote controller is a signal for controlling an operation of the stream source apparatus or the display device, a performing step of having the display device carry out a corresponding operation according to the inputted remote control signal if the judging step judges that the remote control signal is the signal for controlling the display apparatus, a transmitting step of having the display apparatus transmit the inputted remote control signal by wireless to the stream source apparatus if the judging step judges that the remote control signal is the signal of controlling the stream source apparatus, and a step of having the stream source apparatus receive the transmitted remote control signal and multiplexing a plurality of transmission packet streams into a single synthesized transmission packet stream according to the remote control signal to transmit to the display apparatus by wireless.

DETAILED DESCRIPTION OF THE INVENTION

FIG. 2illustrates a block diagram of a stream source apparatus100according to the present invention.

Referring toFIG. 2, a stream source apparatus100according to the present invention includes a central processing unit110controlling a series of operation for transmitting a plurality of transmission packet streams corresponding to various video/audio signals to a display apparatus200that will be explained later, the central processing unit110controlling the stream source apparatus100according to a remote control signal, which is received from the display apparatus200, by an operation of a remote controller and simultaneously generating a response signal corresponding to the received remote control signal to transmit to the display apparatus200by wireless, a transmission packet stream generating unit120generating a plurality of transmission packet streams corresponding to a plurality of the inputted video/audio signals, a digital switching unit130selecting to output a plurality of the transmission packet streams, which will be multiplexed, by switching a plurality of the transmission packet streams generated from the transmission packet stream generating unit120, a transmission packet stream multiplexing unit140synthesizing a plurality of the transmission packet streams outputted from the digital switching unit130to transform into a single transmission packet stream form, a memory150storing the synthesized packet stream transformed by the transmission packet stream multiplexing unit140, a transmission packet stream processing unit160checking whether the transmission packet streams exceeding a previously set amount are stored in the memory150or not and generating a transmission message if the transmission packet streams exceeding the previously set amount are stored in the memory150, and a wireless transmitting/receiving unit170reading to transform the synthesized transmission packet stream stored in the memory150into a radio frequency signal when the transmission message is generated from the transmission packet stream processing unit160, the wireless transmitting/receiving unit170transmitting the radio frequency signal to the display apparatus200by wireless or transmitting/receiving the remote control signal according to the user's operation of the remote controller and the response signal corresponding to the control signal to/from the display apparatus200by wireless.

In this case, the transmission packet stream generating unit120includes a digital broadcast receiving unit121having an ATSC(advanced television systems committee) tuner, a VSB(vestigial side band) chip, and the like to receive a digital broad cast signal of a predetermined channel through an external antenna ANT, the digital broadcast receiving unit121transforming the received digital broadcast signal into a transmission packet stream form to output, a digital signal receiving unit122receiving to output a transmission packet stream corresponding to digital video/audio signals from an external digital equipment, a plurality of analog signal receiving units123-1,123-2, . . . , and123-n receiving analog video/audio signals from a plurality of external analog equipments to output, an analog switching unit124switching a plurality of the analog video/audio signals outputted from a plurality of the analog signal receiving units125according to a control of the central processing unit110to select two of the analog video/audio signals, and first and second MPEG encoders125and126encoding the two analog video/audio signals selected by the analog switching unit124by moving picture expert group (hereinafter abbreviated MPEG), respectively to transform into the transmission packet stream form.

The respective units inside the transmission packet stream generating unit120, the digital switching unit130, the transmission packet stream multiplexing unit140, the memory150, the transmission packet stream processing unit160, and the wireless transmitting/receiving unit170are connected to a control bus (not shown in the drawing) to carry out a predetermined operation in accordance with the control of the central processing unit110.

FIG. 3illustrates a block diagram of a display apparatus according to the present invention.

Referring toFIG. 3, a display apparatus200according to the present invention includes a remote control receiving unit210receiving a remote control signal according to a user's operation, a central processing unit220controlling a series of operation of receiving to PIP-process the synthesized transmission packet stream transmitted by wireless from the stream source apparatus100and simultaneously judging the remote control signal received by the remote control receiving unit210, the central processing unit220transmitting the remote control signal to the stream source apparatus100by wireless if the remote control signal is a signal for controlling an operation of the stream source apparatus100or controlling the display apparatus200to carry out a corresponding operation according to the remote control signal if the remote control signal is a signal for controlling an operation of the display apparatus200, a wireless transmitting/receiving unit230receiving the synthesized transmission packet stream and the response signal corresponding to the remote control signal transmitted by wireless from the stream source apparatus100and transmitting the remote control signal outputted from the central processing unit220to the stream source apparatus100by wireless, a memory240storing the synthesized transmission packet stream received from the wireless transmitting/receiving unit230, a transmission packet stream processing unit250checking whether the synthesized transmission packet stream exceeding a previously set amount is stored in the memory240or not, the transmission packet stream processing unit250generating a transmission message if the synthesized transmission packet stream exceeding the previously set amount is stored in the memory240, and a PIP processing unit260reading the synthesized transmission packet stream stored in the memory240to carry out a PIP processing if the transmission message is generated from the transmission packet stream processing unit250.

The PIP processing unit260includes a transmission packet stream demultiplexer261reading the synthesized transmission packet stream from the memory240to separate into transmission packet streams corresponding to a main screen and a sub-screen respectively when the transmission message is generated from the transmission packet stream processing unit250, a first MPEG decoder262generating a digital video signal and a digital audio signal by decoding the transmission packet stream corresponding to the main screen separated by the transmission packet stream demultiplexer261, a second MPEG decoder263generating a digital video signal by decoding the transmission packet stream corresponding to the sub-screen separated by the transmission packet stream demultiplexer261, an audio processing unit264processing the digital audio signal of the main screen generated from the first MPEG decoder262to output to a speaker or the like, and a video processing unit265carrying out the PIP processing on the digital video signals of the main screen and the sub-screen generated respectively from the first and second MPEG decoders262and263to display a PIP image on a display screen.

In this case, the wireless transmitting/receiving unit230of the display apparatus200, the memory240, the transmission packet stream processing unit250, and the respective units inside the PIP processing unit260ar3connected to the control bus to carry out a predetermined operation according to the control of the central processing unit220.

An interfacing system for stream source apparatus and display apparatus and an interfacing method thereof according to the present invention are explained in detail by referring to the attached drawings ofFIG. 2andFIG. 3as follows.

First of all, by the control of the central processing unit110, the digital broadcast receiving unit121of the transmission packet stream generating unit120receives the digital broadcast signal of a predetermined channel from the external antenna ANT using the built-in ATSC tuner, and then the built-in VSB chip or the like transforms the received digital broadcast signal into the transmission packet stream form to output to the digital switching unit130.

Moreover, the digital video/audio signal receiving unit122of the transmission packet stream generating unit120receives the transmission packet stream corresponding to the digital video/audio signals transmitted from the external digital equipment and then outputs the received transmission packet stream to the digital switching unit130.

Meanwhile, a plurality of the analog video/audio signal receiving units123of the transmission packet stream generating unit120receives a plurality of the analog video/audio signals transmitted from a plurality of the external analog equipments, respectively and the received analog video/audio signals are then inputted to the analog switching unit124.

Subsequently, the analog switching unit124switches to output two of a plurality of the inputted analog video/audio signals selected by the control of the central processing unit110, and the outputted two analog video/audio signals are then transformed into digital video/audio signals by the first and second MPEG encoders125and126, respectively. The digital video/audio signals are compressed into the transmission packet stream to input to the digital switching unit130.

The digital switching unit130switches the two transmission packet streams selected by the control of the central processing unit110from a plurality of the transmission packet streams inputted respectively from the digital broadcast signal receiving unit121, the digital video/audio signal receiving unit122, and the first and second MPEG encoders125and126, and then outputs the switched transmission packet streams.

In other words, in accordance with the control of the central processing unit110, the digital switching unit130selects to output the transmission packet streams corresponding to the main screen and the sub-screen respectively among a plurality of the transmission packet streams inputted from the first and second MPEG encoders125and126.

The transmission packet streams corresponding to the main screen and the sub-screen respectively are then inputted to the transmission packet stream multiplexing unit140.

The transmission packet stream multiplexing unit140synthesizes the transmission packet streams corresponding to the main screen and the sub-screen to transform into the single synthesized transmission packet stream form, and then stores the transformed synthesized transmission packet stream in the memory150.

In this case, when the transmission packet stream multiplexing unit140receives to separate the synthesized transmission packet stream transformed into the transmission packet stream form, it should be clearly distinguished whether the synthesized transmission packet stream is a stream corresponding to the main screen or the sub-screen. Hence, for the purpose of the distinct, a stream type guide field including a guide information is inserted in a header of the synthesized transmission packet stream.

Subsequently, the transmission packet stream processing unit160keeps monitoring an amount of the synthesized transmission packet stream stored in the memory. If the amount of the synthesized transmission packet stream stored in the memory150exceeds a previously set amount, the transmission packet stream processing unit160generates to output the transmission message170to the wireless transmitting/receiving unit170.

The wireless transmitting/receiving unit170reads the synthesized transmission packet stream stored in the memory150in accordance with the transmission message, modulates the read synthesized transmission packet stream into a radio frequency signal, and then transmits the radio frequency signal to the display apparatus200by wireless.

And, the wireless transmitting/receiving unit130of the display unit200receives the synthesized transmission packet stream transmitted by wireless from the wireless transmitting/receiving unit170of the stream source apparatus100to store in the memory240.

The transmission packet stream processing unit250keeps monitoring an amount of the synthesized transmission packet stream stored in the memory240. If the amount of the synthesized transmission packet stream exceeds a previously set amount, the transmission packet stream processing unit250generates a transmission message to output to the transmission packet stream demultiplexer261of the PIP processing unit260.

Then, the transmission packet stream demultiplexer261reads the synthesized transmission packet stream stored in the memory240in accordance with the transmission message inputted from the transmission packet stream processing unit250, and separates the read synthesized transmission packet stream into the transmission packet stream corresponding to the main screen and the transmission packet stream corresponding to the sub-screen.

In this case, the transmission packet stream demultiplexer261, as mentioned in the forgoing description, uses the stream type guide information inserted in the header of the synthesized transmission packet stream to separate the read synthesized transmission packet stream into the transmission packet streams corresponding to the main screen and the sub-screen respectively.

The first MPEG decoder262decodes the separated transmission packet stream corresponding to the main screen by MPEG, and then outputs the digital video and audio signals according to the MPEG-decoded transmission packet stream. And, the second MPEG decoder263decodes the separated transmission packet stream corresponding to the sub-screen by MPEG, and then outputs the digital video signal according to the MPEG-decoded transmission packet stream.

The digital audio signal, which is outputted from the first MPEG decoder262and corresponds to the main screen, is processed by the audio processing unit264, and is then outputted to a speaker (not shown in the drawing) or the like. The digital video signals, which are outputted from the first and second MPEG decoders262and263and correspond to the main screen and the sub-screen, respectively, are inputted to the video processing unit265, are synthesized into the PIP form, and are then displayed on the screen. Hence, a user enables to watch two kinds of images by PIP.

Meanwhile, once the user presses a predetermined key of a remote control transmitter (not shown in the drawing) such as a remote controller or the like to control the operation of the stream source apparatus100or the display apparatus200, the remote control transmitter generates to transmit a pre3determined remote control signal.

The remote control receiving unit210receives the transmitted remote control signal to input to the central processing unit220.

Thereafter, the central processing unit220receives the remote control signal received from the remote control receiving unit210to carry out a predetermined user-demanding control operation, which is explained inFIG. 4.

FIG. 4illustrates a signal flowchart of operating a central processing unit built in a display apparatus according to the present invention.

Referring toFIG. 4, a method of operating a central processing unit includes a judging step of judging whether a remote control signal inputted to a display device in accordance with a user's operation of a remote controller is a signal of controlling an operation of a stream source apparatus or the display apparatus, a performing step of having the display apparatus carry out a corresponding operation according to the inputted remote control signal if the judging step judges that the remote control signal is the signal of controlling the operation of the display apparatus, a transmitting step of having the display apparatus transmit the remote control signal by wireless to the stream source apparatus if the judging step judges that the remote control signal is the signal of controlling the operation of the stream source apparatus, and a step of having the stream source apparatus receive the transmitted remote control signal and multiplexing a plurality of transmission packet streams into a single synthesized transmission packet stream according to the remote control signal to transmit to the display apparatus by wireless.

A method of operating a central processing unit built in a display apparatus according to the present invention is explained in detail by referring to the attached drawings as follows.

First of all, a central processing unit220judges an input of a corresponding remote control signal according to a user's operation of a remote controller (S300), and judges whether the inputted remote control signal is a signal of controlling an operation of a stream source apparatus100or not (S302). In other words, the central processing unit220judges whether the remote control signal is the signal for selecting a transmission packet stream corresponding to a main screen or a sub-screen.

As a result of the judgment step S302, if the remote control signal is not the signal of controlling the operation of the stream source apparatus100but the signal of controlling the operation of the display apparatus200, the central processing unit220controls operation of the respective units of the display apparatus200to carry out a user-demanding operation (S304).

In this case, a PIP processing unit of the display apparatus200is controlled through the remote control signal according to the user's operation of the remote controller, whereby a user enables to switch the main screen and the sub-screen to each other to watch.

Meanwhile, as a result of the judgment step S302, if the remote control signal is the signal of controlling the operation of the stream source apparatus100, the central processing unit220transmits the remote control signal to the stream source apparatus100by wireless through a wireless transmitting/receiving unit230(S306).

A wireless transmitting/receiving unit170of the stream source apparatus100receives the transmitted remote control signal, and then inputs the received remote control signal to the central processing unit110.

Thereafter, the central processing unit110controls a digital switching unit130according to the received remote control signal to select the transmission packet stream corresponding to the main screen and the transmission packet stream corresponding to the sub-screen (S310).

In this case, through the remote control signal according to the user's operation of the remote controller, the digital switching unit130receives transmission packet streams from a digital broadcast signal receiving unit121, a digital video/audio signal receiving unit122, and at least one of analog video/audio signal receiving units121-1,121-2, . . . , and121-n to transform into a single synthesized transmission packet stream, and then outputs the synthesized transmission packet stream to a transmission packet stream multiplexing unit to carry out the operation inFIG. 2.

In this case, the remote control signal generated according to the user's operation of the remote controller includes a channel switching signal for switching a channel of the stream source apparatus100, a volume control signal for adjusting a volume of the stream source apparatus100, an on/off signal for turning on/off a power of the stream source apparatus100, and the like. Hence, the user enables to control both of the stream source apparatus and display apparatus100and200using a single remote controller.

As mentioned in the foregoing description, the remote control signal generated according to the remote controller operation includes various control signals for performing functions used in a general remote controller as well as the channel switching, volume control, and on/off signals, thereby enabling to carry out the various functions according to the various control signals.

Subsequently, the central processing unit110generates a response signal according to a reception of the remote control signal, i.e. a signal for informing that the remote control signal is normally received to carry out the corresponding operation, and then transmits the generated response signal to the stream source apparatus200by wireless through the wireless transmitting/receiving unit140(S312).

A wireless transmitting/receiving unit230of the display apparatus200receives the transmitted response signal to output to the central processing unit220. Through the inputted response signal, the central processing unit220confirms that the remote control signal is normally transmitted to the stream source apparatus100to carry out the user-demanding predetermined operation (S314).

Thereafter, a series of operation of the central processing unit220for carrying out the user-demanding predetermined control operation by receiving the received remote control signal from the remote control receiving unit210is ended.

In the foregoing description of the present invention, for example, the stream source apparatus100multiplexes at least two of the transmission packet streams into the single synthesized transmission packet stream to transmit to the display apparatus200. Yet, the stream source apparatus100synthesizes a plurality of the transmission packet streams into a single synthesized transmission packet stream to transmit to the display apparatus200by wireless, thereby enabling to display a plurality of video signals by PIP. Instead, the present invention includes at least two of the first and second MPEG decoders125and126to decode a plurality of analog video/audio signals by MPEG.

Accordingly, the present invention has the stream source apparatus multiplex a plurality of the transmission packet streams to transmit by wireless and has the display device receive a plurality of the transmitted transmission packet streams, thereby enabling the user to watch a plurality of the video signals by PIP.