KR100262856B1 - Improved video on demand system having dubbing function and dubbing method thereof - Google Patents

Abstract

PURPOSE: A VOD(Video On Demand) system having a dubbing function and a method for dubbing are provided to efficiently dub a user's voice or an external audio signal on a specific program through restoring a bit stream supplied from a server into an original signal. CONSTITUTION: A buffer memory stores distinguisher information of a program sampled by a control unit, and stores an audio dubbing section for the program. A memory block stores a dubbing data for specific audio sections of the program. A recording block stores the dubbing data from outside in the memory block, and withdraws the dubbing data from the memory block in a dubbing reproducing mode. A selector outputs the audio signal of the program through a speaker in a normal reproducing mode. The selector outputs the dubbing data from the recording block in the dubbing reproducing mode.

Description

Improved VOD System with Dubbing Function and Dubbing Method

The present invention relates to a VIDEO ON DEMAND (VOD) system (also called a set-top unit (STU) or subscriber terminal) system, and more particularly, a video on demand (VOD) service from a server. The present invention relates to a VOD system having a dubbing function suitable for dubbing an external user voice or external audio in a VOD system provided with the same, and a dubbing method thereof.

In recent years, with the rapid development of the semiconductor and telecommunications industry, the rapid development of the high-speed ICT infrastructure, which started from the super highway concept of information, is rapidly spreading. The desire of users to obtain information is increasing. The development of interactive cable television (I-CATV), an advanced form of cable television (CATV) that has been commercialized and widely distributed as a way to meet the needs of the times, has been developed by leading companies in the world such as Korea, the United States, and Japan. It's accelerating.

On the other hand, using digital interactive cable television service technology instead of analogue, Video On Demand ensures that television viewers get the information they need (e.g., video information) at the right time. : VOD) service is available. In order to realize such on-demand video service, an information provider composed of a large capacity server capable of storing and transmitting information, a service provider such as a television broadcasting station, and a high-speed information request from a service provider through a network are provided. There is a need for a delivery system provider and a television user to use (or use) service information provided from a delivery system provider for simultaneous delivery to multiple television users.

As described above, the service that can be realized by the video on demand includes, for example, Movies On Demand (MOD), information that can be immediately obtained by title or field of news, and a service such as a summary or headline of news can be provided. News On Demand (NOD), remote shopping that provides a video catalog that allows the user to purchase a desired product, or a user viewing the showcase, transmission of X-ray images, and end user To store or analyze the transmitted data and transmit the diagnosed and prescribed data to other end users, telemedicine, games, home banking, video conferencing, and users that provide general banking services. Agreement services, services that provide information to users and services that enable users to trade using this information. Internet access service for net connection is mentioned.

In this case, the MOD service is a pilot service that has recently been completed in the early stages of development, and is a service such as a home VCR from a video server on the supplier side through a network of programs such as movies. For example, you are offered selection, cancellation, start, stop, pause, fast playback, and rewind.

On the other hand, in order to implement the VOD service, the VOD system requests remote servos to provide information such as programs desired by the user's operation, for example, movies and English conversation programs, and the server responds to the requests from the VOD system. Then, the video stream and the audio data for the corresponding program, that is, a bit stream mixed with video, audio, and text, are fetched from the database and delivered to the VOD system requesting the service.

In this case, the VOD system may use program name information of a desired video or request start and end time information of a desired video when requesting a service from a server, and the server may use the content information transmitted along with a service request message. Then, the stream (ie, video and audio stream) of the corresponding program section is extracted and delivered.

In a typical VOD system, the MPEG bit stream format, which is compression-coded at a predetermined bit rate, is used to transmit data. The bit stream includes an I frame (Intra frame), a P frame (Predicted frame), and a B-directional (Bidirectionally predicted frame). ) Consists of three types of frames. Here, the P frame is encoded by referring to an I frame or a previous frame, and the B frame is encoded by referring to an I frame or a P frame before and after in both directions.

Therefore, in the MPEG decoding block included in the VOD system, when the compressed and encoded bit stream is received from the server, the MPEG decoding block restores the original bit code to the original signal before encoding, and as a result, a complete reconstructed image is displayed on the monitor.

On the other hand, in the typical VOD system that can restore the encoded bit stream (video, audio, text, etc.) provided from the remote server to the original signal before encoding in response to a user request generated whenever necessary as described above, a specific program (E.g., an English conversation program, a program edited and produced for a specific user, etc.) there is currently no consideration on the ability to dub a user voice or audio signal from the outside.

Therefore, if a dubbing function such as that of a conventional V-Cal system can be added to a VOD system that has been widely expanded in recent years, it is possible to maximize the utilization efficiency as well as diversify the usability of the VOD system that can meet various user needs. You can plan.

The present invention has been made in view of the above, and in response to a user request, a user voice or an external audio signal in a VOD system capable of restoring a bit stream such as encoded video, audio, and text provided from a server to an original signal and displaying the original signal. An object of the present invention is to provide an improved VOD system having a dubbing function capable of dubbing effectively to a specific program.

It is another object of the present invention to efficiently dub a user voice or an external audio signal to a specific program in a displayable VOD system by restoring a bit stream such as encoded video, audio, text, etc. provided from a server in response to a user's request. An improved method of dubbing in a VOD system is provided.

According to an aspect of the present invention, there is provided a switching block for generating a key signal corresponding to a user operation, an interface means for performing a data interface with a remote server, and a VOD service request signal provided from the switching block. In response to stream processing means for restoring the encoded video and audio signals of the specific program received from the server through the interface means to the original signals before encoding and outputting them to the monitor and the speaker; A VOD system having control means for performing control of the respective means in response, comprising: in response to a recording start signal from the switching block, storing identifier information of a dubbed set program extracted by the control means, and Set by A buffer memory for storing audio dubbing interval information for a dubbing program; A memory block configured to store dubbing data for at least one specific audio section of the set dubbing program; In response to a dubbing control signal from the control means corresponding to the recording start signal, the dubbing data input from the outside is stored in the memory block, and the dubbing data stored in the memory block is retrieved in the dubbing reproduction mode. Recording block; And in response to a switching control signal from the control means, selects an audio signal of a corresponding program provided by the stream processing means in the normal reproduction mode and outputs the audio signal to the speaker, and a dubbing provided from the recording block in the dubbing reproduction mode. And a selector for selecting data and outputting the data to the speaker, wherein the control means performs the dubbing reproduction mode in a preset audio dubbing period when the service requested program is the dubbing set program, and in another period. It provides an improved VOD system having a dubbing function characterized in performing the normal playback mode.

According to another aspect of the present invention for achieving the above object, the present invention restores an encoded video and audio signal for a specific program provided from a remote server in response to a VOD service request signal according to a user operation to an original signal before encoding. A method of setting audio dubbing of a specific program in a VOD system having a normal playback mode function of displaying the restored video signal on a monitor and outputting the restored audio signal to a speaker, the method comprising: In response, during a normal playback mode for the particular program received from the server, checking whether a recording request signal for audio dubbing according to a user's operation is input; When the recording request signal is input, the identifier information of the specific program and the recording start time information corresponding to the current time of the input stream are stored in the first memory area, and the output of the audio signal to the speaker is blocked and simultaneously from the outside. A second process of executing a recording mode for storing input dubbing data in a second memory area; A third step of checking whether a recording end signal for audio dubbing according to a user's operation is input when the system is executing the recording mode; A fourth process of storing, in the first memory, recording end time information corresponding to a current time of an input stream when the recording end signal is input; Resuming output of the audio signal to the speaker, and switching the recording mode to the normal playback mode; And a sixth process of repeating the first to fifth processes until the reception of the stream for the service-required specific program is ended.

In accordance with another aspect of another aspect of the present invention, in response to a VOD service request signal according to a user operation, the present invention restores an encoded video and audio signal for a specific program provided from a remote server to an original signal before encoding. And performing audio dubbing of a specific program in a VOD system having a normal playback mode function of displaying the restored video signal on a monitor and outputting the restored audio signal to a speaker. The first memory and the external dubbing data corresponding to the audio dubbing section, in which the setting identifier information of at least one specific program set by the dubbing and the setting audio dubbing section information of the corresponding program including the recording start time and the recording end time, are stored. A first memory stored therein; The dubbing execution method may include: a first step of extracting delimiter information from an input stream when a stream for a specific program requested for service is input in response to the VOD service request signal to perform a normal play mode; A second step of checking whether the extracted separator information belongs to setting separator information previously stored in the first memory; A third step of extracting a current time of the stream when the extracted separator information is the set separator information, and checking whether the extracted current time coincides with a recording start time of the set audio dubbing section information; When the extracted current time coincides with the recording start time, the audio signal corresponding to the specific program is blocked from being output to the speaker, and the corresponding dubbing data signal of the set audio dubbing interval stored in the second memory is blocked. A fourth step of executing a dubbing reproduction mode output to the speaker; When the dubbing reproduction mode is running, it is checked whether the extracted current time matches the recording end time of the set audio dubbing section information, and when the extracted current time matches the recording end time, the dubbing A fifth step of switching a play mode to the normal play mode and outputting an audio signal corresponding to the specific program to the speaker; And a sixth process of repeatedly executing the third to fifth processes until the service for the specific program requested by the service is terminated.

1 is a block diagram of an improved VOD system having a dubbing function according to a preferred embodiment of the present invention;

2 is a flowchart illustrating a process of recording a user audio signal for dubbing in a dubbing recording mode according to the present invention;

3 is a flowchart illustrating a process of dubbing and outputting a stored audio signal when a preset dubbing time period is reached in a dubbing reproduction mode according to the present invention;

4 is a diagram illustrating an example in which a plurality of specific sections are configured as a dubbing section in the entire audio stream of a specific program according to the present invention.

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

102: switching block 104: control block

105: buffer memory 106: NIU block

108: MPEG decoding block 110: display block

112: recording block 114: memory block

116: selector

The above and other objects and various advantages of the present invention will become more apparent from the preferred embodiments of the present invention described below with reference to the accompanying drawings by those skilled in the art.

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

1 shows a block diagram of an improved VOD system with a dubbing function according to a preferred embodiment of the present invention.

As shown in the figure, the improved VOD system of the present invention includes a switching block 102, a control block 104, a buffer memory 105, a network interface block (NIU) 106, an MPEG decoding block 108. , Display block 110, recording block 112, memory block 114, and selector 116.

Referring to FIG. 1, the switching block 102 may include an input key signal corresponding to a user manipulation signal provided from a keypad (i.e., a keypad or a remote controller) not shown, for example, a VOD service request signal, a dubbing request signal, Various system operation control signals such as a reproduction mode signal, a recording mode signal, and the like are generated, and the various key signals generated here are provided to the control block 104 via the system bus S1.

First, the NIU block 106 includes, for example, a communication modem, and performs various messages and data interfaces between the VOD system and the server in response to control signals from the control block 104 described later.

Next, the MPEG decoding block 108 performs a function of restoring the video / audio data compression-coded according to the MPEG encoding standard received through the NIU block 106 and the system bus S1 to the original signal before encoding. Here the reconstructed video signal is provided to the display block 110 via line L11 and the reconstructed audio signal is provided to the selector 116 via line 12. At this time, the data recovery operation in the MPEG decoding block 108 is substantially based on the control from the control block 104.

In addition, the display block 110 performs signal processing such as D / A conversion, noise compensation, etc. on the video data restored to the original signal provided from the MPEG decoding block 108 described above, and is not shown for display. Output to the monitor.

On the other hand, the control block 104 includes a microprocessor for performing the overall operation control of the VOD system, for example, sending and receiving a message with a remote server (not shown), the user operation signal for the VOD service request is input The video service request message is generated and provided to the NIU block 106 through the system bus S1, and the stream (video and audio stream) according to the user's request is received from the server through the NIU block 106. Control the restoration operation of the received video stream.

In addition, the control block 104, if the user requests audio dubbing (i.e., input of a dub recording signal) when receiving a stream for a particular program, e. In order to recognize that the dubbing is required by the program, the delimiter information (i.e., ID) for the program is stored in the buffer memory 105, and when a user manipulation signal for recording start is input, recording of the time on the current stream starts. When it is recognized as a time and stored in the buffer memory 105 and an operation signal for releasing recording is input, the time on the current stream is recognized as the recording end time and stored in the buffer memory 105. That is, the buffer memory 105 stores the identifier information (ID) of the dubbing programs and the recording start time and end time information.

Furthermore, the control block 104 generates a recording start signal via the line L13 when the dubbing recording signal is input. As a result, the recording block 112 stores, in response to the recording start signal on the line L13, a user voice or an external audio signal input through a microphone or an external input terminal, not shown, in a corresponding region of the memory block 114. That is, the dubbing audio signal data is stored in the memory block 114.

On the other hand, the control block 104 checks whether the program is a dubbing program set by the user when the system is in the playback mode, that is, when the system is in the playback mode of a specific program provided from the server according to the user's request, and the program is When the dubbing program is set, the recording block 112 and the selector 116 are controlled to output a user voice or an external audio signal previously stored in the memory block 114 for dubbing to the speaker.

That is, the selector 116, in response to the switching control signal provided from the control block 104 via the line L14, directs the audio signal on the line L12 or the dubbed audio signal (or user's voice) on the line L15 to a speaker not shown. Provide or cut off the audio output (during recording mode for dubbing).

Next, the process of performing audio dubbing for a specific program according to the present invention using the improved VOD system according to the present invention having the above-described configuration will be described in detail.

FIG. 2 is a flowchart illustrating a process of adaptively recording an audio signal for dubbing in a dubbing recording mode according to a user's request for a specific program provided from a server in response to a VOD service request according to the present invention.

Referring to FIG. 2, when a user requests a VOD service for a specific program (eg, an English conversation program) to a remote server through a switch operation in a VOD system, the user may request a specific program according to the control of the control block 104. The VOD service request message for the message is generated and forwarded to the remote server via the NIU block 102 (step 202).

In response, the remote server (not shown) transmits a stream for a specific program requested by the corresponding system through a network and transmits the stream to the corresponding VOD system requesting the service. As a result, in the MPEG decoding block 108, it is interfaced through the NIU block 102 to restore the input stream (i.e., video / audio stream) via the system bus S1 to the original signal before encoding, and output it. The normal playback mode of the VOD system, which outputs the reconstructed video signal to the display block 110 via the line L11 and the reconstructed audio signal to the selector 116 via the line L12, is performed (step 204).

Therefore, in the monitor not shown, an image signal of a corresponding program for which a user requests a service is displayed, and an audio signal corresponding to an image of the corresponding program is output from a speaker.

At this time, each audio (i.e. sound) data on the audio stream includes start time and end time information, which time information is used for synchronizing the video signal with the audio signal.

On the other hand, as described above, the control block 104 checks whether the dubbing recording start signal according to the user's operation is input from the switching block 102 during the normal playback mode according to the service request (step 206). This check will continue until the service for the program for which the service is requested ends.

As a result of the check in the step 206, when the dubbing recording start signal is input, the control block 104 stores the identifier information (ID) of the program currently in service in the buffer memory 105 and outputs audio to the speaker at the same time. Block the audio signal output of the program (steps 208 and 210).

Next, the control block 104 switches the current mode of the system to the recording mode, generates a recording start signal on the line L13, provides the recording block 112, and simultaneously recognizes the time information extracted from the current stream as the recording start time. To be stored in a predetermined area of the buffer memory 105 (steps 212 and 214).

Accordingly, the recording block 112 stores a user voice or an external audio signal input through a microphone or an external input terminal (not shown) in a predetermined area of the memory block 114 (step 216).

On the other hand, while performing the recording mode as described above, the control block 104 checks whether or not the dubbing recording end signal according to the user's operation is input from the switching block 102 (step 218). The system continues until it finishes recording the dubbing voice or audio signal.

As a result of the check in step 218, when the dubbing recording end signal is input, the control block 104 restarts the audio output to the speaker, i.e., resumes the audio signal output of the program and simultaneously extracts the time from the current stream. The information is recognized as the recording end time and stored in a predetermined area of the buffer memory 105 (steps 220 and 222).

At this time, the execution of the adaptive dubbing recording mode according to the user operation (or request) as described above is performed when the service of the program for which the service is requested is terminated through the repetitive processing of steps 204 to 222 described above. (Step 224), if the check in step 224 determines that the service for the particular program that the user requested the service is terminated, processing proceeds to step 226 to wait for the user's next request. Will run the mode.

Accordingly, in the present invention, the audio dubbing for a specific program can be set through the above-described process, and the audio section and the dubbing data to be dubbed can be stored and recorded.

On the other hand, the process of performing a voice or audio dubbing for a specific program dubbing according to the present invention in a state in which dubbing settings for the specific program and dubbing voice or audio data are stored in advance through the above-described process. Explain.

3 is a flowchart illustrating a process of dubbing and outputting a stored audio signal when a preset dubbing time period is reached in a playback mode according to a VOD service request while dubbing for a specific program is preset according to the present invention.

Referring to FIG. 3, according to the present invention, dubbing is set for a specific program, and a recording start time and recording end time, and dubbing data (user voice or external audio signal) for a specific program set to dubbing are stored in advance. If a user requests a VOD service for a particular program from a remote server (step 302), the control block 104 determines program identifier information (i.e., ID) for the service requested program in the stream received through the NIU block 106. ) Is extracted (step 304).

Next, it is checked whether the extracted program ID is a program ID for which dubbing is set by the user (step 306). That is, the buffer memory 105 stores ID information about programs that are preset to dubbing by the user. The control block 104 searches for the buffer memory 105 to determine whether the extracted program ID is a previously stored program ID. Check whether or not.

If it is determined in the step 306 that the extracted program ID is not a dubbing set program ID, the process proceeds to step 320 which will be described later. In step 320, normal playback according to the VOD service request is performed. The mode is executed, i.e., decoding of the video and audio streams received in response to the service request and output to the monitor and the speaker.

On the other hand, if it is determined in step 306 that the extracted program ID is a dubbed program ID, decoding and outputting of the video and audio streams of the currently received program are performed, and the time of the input current stream is input. Extract (step 308). At this time, the time information inserted on the stream is for finishing synchronization between the video signal and the audio signal.

Then, the control block 104 continuously checks whether there is a time coinciding with the current time of the extracted stream during the recording start time previously stored in the buffer memory 105 (step 310). It continues to run until the service of the dubbing program is terminated.

As a result of the check in step 310, if it is determined that the extracted current time coincides with any one of the pre-stored recording start time, the control block 104 switches the current mode of the system to the dubbing reproduction mode, that is, the line L13. By generating a dubbing start signal on the control unit, the recording block 112 controls the dubbing data previously stored in the memory block 114 to be output through the line L15, and generates a switching control signal on the line L14 to selector ( 116 controls to selectively output the dubbing data (user voice or external audio signal) on the line L15 (step 312).

Thus, since the dubbing data is output through the selector 116 to the speaker not shown, the speaker may output a user voice or an external audio signal which is pre-set by the user and stored in advance (step 314).

Of course, when such audio dubbing data is output, the video stream of the program is displayed as a video signal on a monitor for signal processing (i.e., decoding, etc.) through a conventional path.

On the other hand, when the dubbed audio signal is output through the speaker as described above, the control block 104 determines whether the current time continuously extracted coincides with any of the recording end times previously stored in the buffer memory 105. It is checked whether it is (step 316), and this check is repeated continuously until a recording end time matching the extracted current time is detected.

On the other hand, if the check result in the step 316, the extracted current time coincides with any one of the pre-stored recording end times, the control block 104 changes the current mode (dubbing playback mode) of the system to the normal playback mode. Switching to, i.e., generating a dubbing control signal on line L13 to stop fetching data for dubbing and simultaneously generating a switching control signal on line L14 so that the selector 116 receives the audio signal on the line L12 (i.e. Control to output an audio signal of a program (steps 318 and 320).

Therefore, the VOD system executes a normal playback mode in which decoding of video and audio streams of a currently received program and output to a monitor and a speaker are executed. Whether audio dubbing in the next section is performed during the normal playback mode. Check continuously.

That is, when the normal playback mode is running, the current time of the stream is continuously extracted through the above-described steps 308 and 310, and a time coinciding with the current time of the extracted stream during the pre-stored recording start time is set. It continuously checks whether there is, and whether or not the execution of this dubbing reproduction mode is performed continuously until the service of the specific program currently being received in response to the service request is terminated. That is, whenever there is a time coinciding with the current time of the extracted stream during the pre-stored recording start time during the execution of the normal playback mode, the selective dubbing playback mode is changed through the repetitive processing of steps 312 to 316 described above. Run

The adaptive mode switching of the normal playback mode and the dubbing playback mode as described above continues until the service for the corresponding program is terminated, i.e., as shown in FIG. Assuming that the section where Tn and audio dubbing is set is a section t0 to t1 (A), a section t2 to t3 (B), and a section t4 to t5 (C), the section filled with diagonal lines when the VOD service for the program is performed. In A, B, and C, the pre-stored dubbing signal (user voice or external audio signal) for dubbing will be output to the speaker, and in other sections, the audio signal corresponding to the program will be output to the speaker.

As described above, according to the present invention, a VOD system capable of receiving various programs desired by a user from a remote server can be provided by using delimiter information assigned to each program and time information for synchronization between video signals and audio signals. By arbitrarily setting a user voice or an external audio signal corresponding to an audio signal of a specific program, it is possible to diversify the usability of the VOD system that can respond to various user needs and to maximize the use efficiency.

Claims (5)

A switching block for generating a key signal corresponding to a user operation, an interface means for performing a data interface with a remote server, and a specific program received from the server through the interface means in response to a VOD service request signal provided from the switching block; Stream processing means for restoring the encoded video and audio signals to the original signal before encoding and outputting them to a monitor and a speaker, and control means for controlling the respective means in response to a user operation signal provided from the switching block. In one VOD system, A buffer memory that stores, in response to a recording start signal from the switching block, identifier information of a dubbing set program extracted by the control means, and stores audio dubbing section information on the dubbing set program set by a user; A memory block configured to store dubbing data for at least one specific audio section of the set dubbing program; In response to a dubbing control signal from the control means corresponding to the recording start signal, the dubbing data input from the outside is stored in the memory block, and the dubbing data stored in the memory block is retrieved in the dubbing reproduction mode. Recording block; And In response to a switching control signal from the control means, an audio signal of a corresponding program provided by the stream processing means is selected and output to the speaker in a normal reproduction mode, and dubbing data provided from the recording block in a dubbing reproduction mode. Further comprising a selector for selecting and outputting to the speaker, The control means has a dubbing function characterized in that when the service requested program is the dubbing set program, the dubbing reproduction mode is performed in a preset audio dubbing period, and the normal reproduction mode is performed in other periods. Improved VOD System. 2. The improved VOD system with a dubbing function according to claim 1, wherein the audio dubbing interval information includes recording start time and recording end time information. In response to the VOD service request signal according to the user's operation, the encoded video and audio signals of the specific program provided from the remote server are restored to the original signals before encoding, and the restored video signals are displayed on the monitor and the audio is restored at the same time. A method of setting audio dubbing of a specific program in a VOD system having a normal play mode function of outputting a signal to a speaker, A first step of checking whether a recording request signal for audio dubbing according to a user's operation is input in response to the VOD service request signal when performing a normal playback mode for a specific program received from the server; When the recording request signal is input, the identifier information of the specific program and the recording start time information corresponding to the current time of the input stream are stored in the first memory area, and the output of the audio signal to the speaker is blocked and simultaneously from the outside. A second process of executing a recording mode for storing input dubbing data in a second memory area; A third step of checking whether a recording end signal for audio dubbing according to a user's operation is input when the system is executing the recording mode; A fourth process of storing, in the first memory, recording end time information corresponding to a current time of an input stream when the recording end signal is input; Resuming output of the audio signal to the speaker, and switching the recording mode to the normal playback mode; And And a sixth process of repeating the first to fifth processes until the reception of the stream for the service-required specific program is terminated. 4. The method of claim 3, wherein the second process is: A twenty-first step of, if the recording request signal is input, storing the delimiter information extracted from the stream of the specific service requested program in the first memory; A twenty-second step of interrupting an audio signal output to the speaker and switching the normal playback mode to the recording mode; A twenty-third step of extracting a current time from an input stream of the specific program requested for service and storing the extracted current time as the recording start time information in the first memory area; And And a twenty-fourth step of storing the input dubbing data in the second memory when the dubbing data is input from the outside. In response to the VOD service request signal according to the user's operation, the encoded video and audio signals of the specific program provided from the remote server are restored to the original signals before encoding, and the restored video signals are displayed on the monitor and the audio is restored at the same time. A method of performing audio dubbing of a specific program in a VOD system having a normal play mode function of outputting a signal to a speaker, The VOD system corresponds to a first memory and an audio dubbing section in which configuration identifier information for at least one specific program set by a user and setting audio dubbing section information of a corresponding program including recording start time and recording end time are previously stored. And a first memory in which external dubbing data is pre-stored, The dubbing execution method is: In response to the VOD service request signal, extracting delimiter information from an input stream when a stream for a specific service requested program is input and performing the normal play mode; A second step of checking whether the extracted separator information belongs to setting separator information previously stored in the first memory; A third step of extracting a current time of the stream when the extracted separator information is the set separator information, and checking whether the extracted current time coincides with a recording start time of the set audio dubbing section information; When the extracted current time coincides with the recording start time, the audio signal corresponding to the specific program is blocked from being output to the speaker, and the corresponding dubbing data signal of the set audio dubbing interval stored in the second memory is blocked. A fourth step of executing a dubbing reproduction mode output to the speaker; When the dubbing reproduction mode is running, it is checked whether the extracted current time matches the recording end time of the set audio dubbing section information, and when the extracted current time matches the recording end time, the dubbing A fifth step of switching a play mode to the normal play mode and outputting an audio signal corresponding to the specific program to the speaker; And And a sixth process of repeatedly executing the third to fifth processes until the service for the specific program required for the service is terminated.

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