KR101358709B1 - Device and method for scanning service channel of digital broadcasting receiver - Google Patents

Abstract

A method of changing a service channel of a digital broadcast receiver includes setting a selected service channel and at least one buffering service channel identifier, and reproducing data of a received service channel if the identifier of the service channel received in the broadcast mode is the identifier of the selected service channel. If the identifier of the buffering service channel, the process of storing the data of the receiving service channel in the set buffer, if the service channel change is required in the broadcast mode, select and play the output of the buffer for storing the changed service channel data, According to the change of the service channel, the process of changing the service channel is performed in the broadcast mode after resetting the identifier of the buffered service channel.

Digital Broadcast Receiver, Channel, Service Channel, Channel Scan

Description

Device and method for changing service channel of digital broadcasting receiver {DEVICE AND METHOD FOR SCANNING SERVICE CHANNEL OF DIGITAL BROADCASTING RECEIVER}

1 is a diagram showing the configuration of a digital broadcast receiver according to an embodiment of the present invention.

FIG. 2 is a diagram showing the configuration of the broadcast data demodulator of FIG.

3 is a diagram illustrating a configuration of a broadcast data storage unit of FIG. 1.

4 is a diagram showing the configuration of the broadcast data decoder of FIG.

5 is a diagram illustrating a data structure of a service channel received by a digital broadcast receiver.

6A is a diagram illustrating a configuration example of service channel data using a time slicing scheme, and FIGS. 6B to 6D are diagrams for describing a buffering method of an adjacent service channel according to the first embodiment of the present invention. 6E is a diagram illustrating a buffering method of a preferred service channel according to a second embodiment of the present invention.

7 is a flowchart illustrating a service channel control procedure of a digital broadcast receiver according to an embodiment of the present invention.

8 is a flowchart illustrating a procedure of processing data of a service channel according to the first embodiment of the present invention in FIG.

9 is a flowchart illustrating a service channel change procedure according to the first embodiment of the present invention in FIG.

FIG. 10 is a flowchart illustrating a procedure of processing data of a service channel according to the second embodiment of the present invention in FIG.

11 is a flowchart illustrating a service channel change procedure according to the second embodiment of the present invention in FIG.

12 is a flowchart illustrating a procedure of processing data of a service channel according to the third embodiment of the present invention in FIG.

13 is a flowchart illustrating a service channel change procedure according to the third embodiment of the present invention in FIG.

14 is a flowchart illustrating a procedure of resetting a PID and a buffer of an adjacent service channel in FIG.

15 is a diagram showing another configuration of a digital broadcast receiver according to an embodiment of the present invention.

16 is a diagram showing the configuration of a mobile terminal having a digital broadcast receiver according to an embodiment of the present invention.

17 is a diagram showing the configuration of a mobile terminal having another digital broadcast receiver according to an embodiment of the present invention.

The present invention relates to a service channel control apparatus and method for a digital broadcast receiver, and more particularly, to a service channel control apparatus and method for a digital broadcast receiver using a single tuner.

Currently, the digital broadcast receiver receives and displays various digital broadcast signals. The digital broadcast signal is a digitally encoded and modulated signal, and the receiver must demodulate and decode the data in reverse. Therefore, the digital broadcast receiver should have a tuner, a broadcast data demodulator, a broadcast data decoder, and the like. Currently, the digital broadcasting method can be roughly divided into DMB (Digital Multimedia Broadcasting) and DVB (Digital Video Broadcasting). The digital broadcasting uses a method of serving a plurality of service channels in one frequency channel, and the service channels are channels for transmitting program information and / or broadcast information of channels for transmitting digital broadcast signals broadcast from broadcasting stations. It may consist of.

Therefore, current portable terminals have a trend of mounting a multimedia dedicated processor or reinforcing a multimedia function, and among the multimedia functions, a trend of mounting a digital broadcasting receiver as described above. Therefore, the current mobile terminal should have a configuration capable of serving a variety of multimedia functions, due to which the configuration and processing procedures of the mobile terminal is complicated. The portable terminal may be a wireless terminal, a notebook computer, a PDA, or the like. The portable terminal may include an RF communication unit that performs a wireless communication function.

Such digital broadcasting services a large number of service channels. Accordingly, the digital broadcast receiver should be able to select desired service channels by scanning for desired service channels. That is, in the case of the digital broadcast receiver, since it services many service channels, it is difficult for a user to identify broadcasts serviced in each service channel. As described above, the user may select a desired service channel while changing service channels being viewed.

However, when changing the service channel in the digital broadcast receiver, it is confirmed that the broadcast signal of the service channel selected by the user, and the signal of the identified service channel is demodulated and decoded and displayed on the screen. In this case, the signal of the service channel selected by the user may be displayed after the service channel check and processing time as described above has elapsed. Therefore, when the digital broadcast receiver displays the signal of the service channel selected when the service channel is changed, the signal of the selected service channel cannot be displayed for the checking and processing time. There was a problem that can not display or to display a different screen.

For example, in the case of a DVH digital broadcast receiver, a burst generally occurs within 1 second as short and every 3-4 seconds as long. Therefore, when the user wants to change to another service channel while watching the service channel selected by the user, the broadcast signal cannot be viewed until the burst of the service channel to be changed is received. Therefore, it is not possible to display the broadcast signal during the time for checking the signal of the service channel to be changed (that is, the time when the burst of the corresponding service channel is received) and during the processing thereof, and thus the service channel change time may be longer. In addition, a problem occurs that the broadcast signal is disconnected and cannot be displayed at the service channel change time.

Accordingly, an object of the present invention is to provide an apparatus and method for selecting a service channel by reducing a service channel change time of a digital broadcast receiver.

Another object of the present invention is to buffer at least one service channel signal adjacent to a channel currently being viewed by a digital broadcasting receiver, and to reduce the change time of a service channel by displaying the buffered service channel signal when the channel is changed. An apparatus and method are provided.

It is still another object of the present invention to buffer at least one service channel signal having a high user preference and a channel currently being viewed by a digital broadcasting receiver, and to change a service channel by displaying a signal of the buffered service channel when the channel is changed. It is to provide an apparatus and method that can be reduced.

Still another object of the present invention is to buffer at least one service channel signal adjacent to the selected service channel when receiving a signal of a currently selected service channel in a mobile terminal having a digital broadcast receiver, and when the service channel is changed, the buffered service. The present invention provides an apparatus and method for reducing a service channel change time by displaying a signal of a channel.

Still another object of the present invention is to buffer at least one service channel signal having a high user preference when receiving a signal of a currently selected service channel in a mobile terminal having a digital broadcast receiver, and when the service channel is changed, the buffered service channel. The present invention provides an apparatus and method for reducing a service channel change time by displaying a signal of.

An apparatus for changing a service channel of a digital broadcast receiver according to an embodiment of the present invention for achieving the above object comprises: a tuner for outputting a service channel signal of a set physical channel frequency, and demodulating the output of the tuner; A broadcast data demodulator for selecting and outputting service channel data having an identifier of one buffering service channel, and storing service channel data output from the broadcast data demodulator in corresponding buffers, and storing data of the selected service channel And a broadcast data storage unit for selectively outputting the output of the buffer, a broadcast data decoder for decoding the service channel data output to the broadcast data storage unit, a display unit for displaying the decoded data, and a speaker. The change data by controlling the broadcast data storage unit Select the data from a buffered channel, characterized in that the output of a selected service channel data.

And controlling the broadcast data storage to select and output buffering data of the changed service channel as selected service channel data when the service channel is changed, and set reset identifiers of the selected and buffered service channels in the broadcast data demodulator. At the same time, characterized in that it further comprises a service channel change control unit for resetting the buffers of the broadcast data storage unit.

In addition, the broadcast data demodulator, a demodulator for demodulating the received service channel signal, and an identifier filter for analyzing and outputting the identifier of the demodulated service channel data to select and output service channel data having identifiers of the selected selection and buffering service channels. It is characterized in that the identifier is a program identifier.

The broadcast data storage unit may further include a buffer for storing selection service channel data, buffers for storing the at least one buffering service channel data, and the selection and buffering service channel data under the control of the service channel change controller. And a second selector for selectively outputting a buffer output for storing data of the selected service channel under the control of the service channel change control unit.

The buffering service channel may be an upper service channel and a lower service channel of the selected service channel. When the service channel is changed, the buffering service channel is controlled to select and play data of the changed service channel when the service channel is changed. If the change service channel is an upper service channel of the selected service channel, the previous lower service channel identifier is released, the upper service channel identifier of the changed service channel is set, and the lower service channel of the fraudulent selection service channel, and the previous upper service channel identifier is released. And setting a lower service channel identifier of the changed service channel.

The buffering service channels are preferred service channels having a high user preference. When the service channel is changed, the service channel change control unit controls to select and play data of the changed service channel if the change service channel is a preferred service channel. If the previous selected service channel is the preferred service channel, the buffering service channel may be set.

The buffering service channel may be adjacent service channels that are upper service channels and lower service channels of the selected service channel, and preferred service channels having a high selection preference of the user.

In addition, a service channel changing apparatus for a digital broadcast receiver according to an embodiment of the present invention for achieving the above object includes a tuner for outputting a service channel signal of a set physical channel frequency, a broadcast data demodulator for demodulating the output of the tuner; Identifiers of a selected service channel and at least one buffering service channel are set, and a demultiplexer for demultiplexing and outputting service channel data of the set identifier, and service channel data output from the demultiplexer, respectively, in corresponding buffers. A broadcast data storage unit for storing and outputting a buffer for storing data of the selected service channel, a broadcast data decoder for decoding service channel data output to the broadcast data storage unit, and displaying the decoded data. Consisting of a display unit and a speaker to change the service channel. And controlling the broadcast data storage to select buffering data of the changed service channel and output the selected service channel data.

In addition, a method of changing a service channel of a digital broadcast receiver according to an embodiment of the present invention for achieving the above object comprises the steps of: setting a selected service channel and at least one buffering service channel identifier; If the identifier is an identifier of a selected service channel, reproducing and displaying data of the received service channel; if an identifier of a buffered service channel, storing the data of the received service channel in a set buffer; and requesting a service channel change in the broadcast mode. And selecting and playing the output of the buffer storing the changed service channel data, resetting the identifier of the buffered service channel according to the change of the service channel, and then changing the service channel to the broadcast mode. It is done.

The buffering service channels may be adjacent service channels having upper and lower service channel numbers of the selected service channel.

When the adjacent service channels are buffered service channels, the service channel change process may include setting the changed service channel as a selected service channel, reproducing and displaying data of the stored change service channel, and changing the service. If the channel is an upper service channel of the previous selected service channel, releasing an identifier of a previous lower service channel, setting an identifier of an upper service channel of the changed service channel, and then proceeding to the broadcast mode; When the lower service channel of the previous selected service channel is released, the identifier of the previous higher service channel is set, and the identifier of the lower service channel of the changed service channel is set.

In addition, when the adjacent service channels are buffered service channels, the process of performing the broadcast mode may include: checking an identifier when receiving service channel data; and receiving data of the selected service channel if the identifier is an identifier of the selected service channel. Displaying the processed broadcast screen; if the identifier is an identifier of an upper service channel of the selected service channel, storing the received service channel data in a set upper service channel buffer; And storing the service channel data in a predetermined lower service channel buffer.

The buffering service channels may be preferred service channels set by the user's preference.

In addition, when the buffering service channels are preferred service channels, the service channel change process sets the change service channel as a selection service channel if the change service channel is a preferred service channel, and stores data of the stored change service channel. If it is a non-preferred service channel, setting the changed service channel as the selected service channel, and after setting the selected service channel, if the previous selected service channel is a non-preferred service channel, the identifier of the service channel is released; The process of maintaining the identifier of the service channel and proceeds to the broadcast mode.

In addition, when the buffering service channels are preferred service channels, the process of performing the broadcast mode may include checking an identifier when receiving service channel data, and receiving data of the selected service channel if the identifier is an identifier of the selected service channel. And displaying the broadcast screen for processing and displaying the received service channel data in the corresponding service channel buffer if the identifier is the identifier of the preferred service channel.

The buffering service channels may be adjacent service channels having upper and lower service channel numbers of the selected service channel and preferred service channels set by the user's selection preference.

If the buffering service channels are the adjacent and preferred service channels, the service channel changing process may include: setting the changed service channel as a selected service channel, reproducing and displaying data of the stored changed service channel; If the changed service channel is an adjacent service channel of the previous selected service channel, it is determined whether it is an upper or lower service channel. If the changed service channel is an upper service channel of the previous selected service channel, the identifier of the previous lower service channel is released and the upper service of the changed service channel is checked. After setting an identifier of a channel, the process proceeds to the broadcast mode, and if it is a lower service channel of the previous selected service channel, the identifier of the lower service channel of the changed service channel is set after releasing the identifier of the previous higher service channel. Process and the change service If the switch channel is the preferred service channel, the change service channel is set as the selected service channel, and the data of the stored change service channel is reproduced and displayed; if the non-preferred service channel, the change service channel is set as the selected service channel; After setting the selected service channel, if the previous selected service channel is a non-preferred service channel, the identifier of the service channel is released; if the preferred channel, the identifier of the service channel is maintained and the process proceeds to the broadcast mode.

If the buffering service channels are the adjacent and preferred service channels, the service channel changing process may include: setting the changed service channel as a selected service channel, reproducing and displaying data of the stored changed service channel; If the changed service channel is an adjacent service channel of the previous selected service channel, it is checked whether it is an upper or lower service channel. If the changed service channel is an upper service channel of the previous selected service channel, an identifier of a previous lower service channel is examined. Releases the service channel identifier, checks the identifier of the upper service channel of the changed service channel, sets the identifier of the upper service channel if not the preferred service channel, and proceeds to the broadcast mode; If channel, the previous parent service bond Proceeding to the broadcast mode after releasing the identifier of the changed service channel and setting the identifier of the lower service channel of the changed service channel; if the changed service channel is the preferred service channel, setting the changed service channel as the selected service channel; Replays and displays the data of the changed service channel being stored. If the service channel is the non-preferred service channel, sets the service channel to the selection service channel. If it is released and the preferred channel maintains the identifier of the service channel characterized in that the process of proceeding to the broadcast mode.

In addition, a portable terminal device having a digital broadcast receiver according to an embodiment of the present invention for achieving the above object; A wireless communication unit for processing wireless communication data; A tuner for outputting a service channel signal having a set physical channel frequency, a broadcast data demodulator for demodulating the output of the tuner, and selecting and outputting service channel data having an identifier of a selected service channel and at least one buffering service channel; A broadcast data storage unit for storing the service channel data output from the broadcast data demodulator in corresponding buffers, and selectively outputting the output of a buffer for storing the data of the selected service channel; The digital broadcast receiver comprising a broadcast data decoder for decoding service channel data; In the broadcast mode, the selected service channel data is reproduced and displayed, and the data of the buffered service channels are stored in a buffer, and when the service channel is changed, the broadcast data storage unit is controlled to select buffered data of the changed service channel to select service channel data. A control unit for outputting a call and processing a call generated in the broadcast mode through the wireless communication unit; And a display unit and a speaker for displaying data of the decoded service channel and data processed in the communication mode.

In addition, when the service channel is changed, the control unit controls the broadcast data storage unit to select buffering data of the changed service channel and output the selected service channel data, and reset the identifiers of the selection and buffering service channels to the broadcast data demodulator. And resetting buffers of the broadcast data storage unit at the same time.

The controller may display an incoming alert including called subscriber information when the incoming call occurs in the broadcast mode.

The controller may transmit the outgoing data through the wireless communication unit when an outgoing signal is generated in the broadcast mode.

In addition, a portable terminal device having a digital broadcast receiver according to an embodiment of the present invention for achieving the above object; A wireless communication unit for processing wireless communication data; A tuner for outputting a service channel signal of a set physical channel frequency, a broadcast data demodulator for demodulating the output of the tuner, identifiers of a selected service channel and at least one buffered service channel are set, and service channel data of the set identifier A demultiplexer for demultiplexing and outputting the demultiplexer, a broadcast data storage unit for storing the service channel data output from the demultiplexer in corresponding buffers, and selectively outputting the output of a buffer for storing the data of the selected service channel; A digital broadcast receiver comprising a broadcast data decoder for decoding service channel data output to the broadcast data storage unit; In the broadcast mode, the selected service channel data is reproduced and displayed, and the data of the buffered service channels are stored in a buffer, and when the service channel is changed, the broadcast data storage unit is controlled to select buffered data of the changed service channel to select service channel data. A control unit for outputting a call and processing a call generated in the broadcast mode through the wireless communication unit; And a display unit and a speaker for displaying data of the decoded service channel and data processed in the communication mode.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a detailed description of preferred embodiments of the present invention will be described with reference to the accompanying drawings. It should be noted that the same configurations of the drawings denote the same reference numerals as possible whenever possible.

In the following description, specific details such as digital broadcasting such as DVB, time of burst channel, number of buffering channels, and the like are shown to provide a more general understanding of the present invention. It will be apparent to those skilled in the art that the present invention may be readily practiced without these specific details and with modifications thereto.

Embodiments of the present invention relate to a digital broadcast receiver or a mobile terminal having such a digital broadcast receiver for buffering at least one other service channel signal in preparation for a service channel signal selected by a user and a service channel change of the user. Here, the digital broadcasting can be classified into DMB (Digital Multimedia Broadcasting) and DVB (Digital Video Broadcasting). The DMB and DVB schemes all use digital broadcasting schemes. In addition, the DVB scheme includes a DVB_T scheme and a DVB_H scheme, and the DVB_H scheme uses an IP-based broadcast signal. The digital broadcast receiver according to the embodiment of the present invention will be described by way of example as receiving and processing the broadcast signal of the DVB_H. However, the digital broadcast receiver according to the embodiment of the present invention can be applied to both the DVB method and the DMB method.

A channel refers to a frequency channel selected by the tuner, and a service refers to a service channel classified by a program identifier or product identifer (PID) as a channel of an actual broadcasting station transmitted on the selected channel. Event refers to programs provided by each service. In an embodiment of the present invention, the channel is used as a "physical channel" and the service is used as a "service channel" in order to prevent confusion caused by the use of the terms. In digital broadcasting, a plurality of service channels are transmitted in one physical channel, and a physical channel means a channel frequency set in a tuner, and a service channel means channels identified by a PID (program identifier or product identifier) in the physical channel. do. An embodiment of the present invention relates to an apparatus and method for controlling a service channel change of a plurality of service channels serviced to one physical channel in a digital broadcast receiver using a single tuner.

In addition, the terms of each service channel used in the following description are defined as follows. The term " selected service channel " means a service channel selected by a user and displaying broadcast data on the display unit. The term " change service channel " means a service channel that is selected by a user and changed to a selected service channel in the state of reproducing data of an arbitrary service channel. The term " previously selected service channel " refers to a service channel that was previously a selected service channel with the change service channel switched to the selected service channel. The term " adjacent service channel " means a service channel having a higher channel number and / or a lower channel number than a selected service channel. The term "higher service channel" means a service channel having a higher channel number than the selected service channel as an adjacent service channel, and the term "lower service channel" has a channel number lower than the selected service channel as an adjacent service channel. It means service channel. The term " preferred service channel " refers to a service channel having a high user preference, and is set as a buffered service channel by a user's setting or a digital broadcast receiver. The term " buffered service channel " refers to a service channel stored in a buffer while performing a broadcast mode such as the adjacent service channel and the preferred service channel.

1 is a diagram illustrating a structure of a digital broadcast receiver for changing a service channel according to an embodiment of the present invention.

Referring to FIG. 1, the controller 100 controls the overall operation of the digital broadcast receiver. The key input unit 170 generates key data according to a user's selection and applies the generated key data to the controller 100. In this case, the user's command generated through the key input unit 170 may be a selection, change, or playback of a service channel. In an embodiment of the present invention, the control unit 100 stores service channel data other than the service channel being watched while watching a broadcast, and changes a service channel while reproducing the data of the stored service channel when a service channel change request is made. Functions as a channel change controller. The memory 160 may include a program memory for storing a program for controlling the operation of the digital broadcast receiver, and a data memory for storing data generated during program execution. The program memory of the memory 160 may include a program for performing a buffering operation for changing a service channel according to an embodiment of the present invention. The controller 100 controls the operation of the digital broadcast receiver by analyzing key data generated by the key input unit 170. That is, the controller 100 controls the operation mode (playback, recording, channel selection and change, etc.) of the digital broadcast receiver according to the user's selection.

The tuner 110 sets the physical channel frequency of the service channel selected by the user under the control of the controller 100 and receives a broadcast signal of the set physical channel. The broadcast data demodulator 120 demodulates the broadcast signal of the physical channel output from the tuner 110. In this case, the broadcast data demodulator 120 demodulates and outputs a plurality of service channel signals included in a physical channel. The broadcast data storage unit 130 buffers data of a service channel selected from among data of a service channel output from the broadcast data demodulator 120 and data of at least one other service channel to be used when changing a broadcast service channel under the control of the controller 100. The broadcast data decoder 140 decodes and outputs a signal of a service channel selected by the user. The broadcast data decoder 140 may be composed of video and audio decoders, and the decoded video and audio signals are applied to the display unit 150 and the speaker 160 and reproduced.

In FIG. 1, the broadcast data demodulator 120 and the broadcast data decoder 140 may be configured in different forms according to a digital broadcast method. The digital broadcast receiver has a DMB and DVB scheme, and the DVB scheme includes a DVB_T and DVB_H scheme. In the DMB and DVB digital broadcast receivers, the received broadcast data has an MPEG2-TS structure, and the broadcast data of the MPEG2-TS structure is a packet stream, and each packet includes a packet header and a payload. In addition, the packet header includes an identifier for identifying a service channel and includes PID information. Accordingly, the digital broadcast receiver can select a desired service channel using the PID information. In this case, the payload of each packet having an MPEG2_TS structure in the DMB and DVB_T digital broadcast receivers is filled with broadcast data, and the payload of each packet having an MPEG2-TS structure in the DVB_H digital broadcast receiver is IP information. It is filled with protocol information and broadcast data to include. Accordingly, in the DVB_T and DMB schemes, the broadcast data demodulator 120 may be configured as a demodulator for demodulating service channel data. The broadcast data decoder 140 may decode a signal of a selected service channel, such as a demultiplexer, a video and audio decoder, and the like. Has a configuration. However, in the DVB_H scheme, the broadcast data demodulator 120 demodulates data of a received service channel and a PID filter for selecting data of a service channel selected by a user from among the demodulated broadcast data, and the control of the controller 100. Demodulation controller for controlling the operation of the demodulator and tuner 110. The broadcast data decoder 140 may include a protocol processor for processing IP information, a video and audio decoder, and the like.

According to an embodiment of the present invention, a digital broadcast receiver buffers a signal of a service channel that is expected to be changed in a broadcast channel that is currently being viewed, and reproduces the buffered signal when the service channel is changed, thereby changing the service channel change time of the digital broadcast receiver. To reduce it. That is, the digital broadcast receiver processes a signal of a service channel currently viewed by a user and does not process a signal of another service channel. Therefore, when the user wants to change from the service channel currently being watched to another service channel, the digital broadcast receiver cannot reproduce the broadcast signal during the time for acquiring the signal of the corresponding service channel, thereby stopping the display operation of the broadcast signal. In the embodiment of the present invention, in order to reduce the service channel change time when the service channel is changed, buffer the signal of the service channel to be changed, and service channel change time by processing the signal of the buffered service channel when the service channel is changed. At the same time, it is possible to continuously display the broadcast signal when changing the service channel.

In an embodiment of the present invention, in order to reduce the service channel change time, at least one service channel signal adjacent to a currently broadcast service channel is buffered. In this case, the service channel change may be performed in two ways. One method is to change the service channel by sequentially up and / or down the service channel to be changed in the current service channel, and the other is to select the service channel preferred by the user and perform the service channel change. Can be used. The former method of changing a service channel may be generated when a channel up / down change key is used, and the latter method uses a shortcut key (or channel up / down key) for a numeric key and / or set service channels. To select the preferred service channel number. Accordingly, the buffering method of the service channel signal for changing the service channel may use a method of buffering signals of adjacent service channels and a method of buffering signals of service channels according to user preference. In addition, the two methods are mixed to buffer signals of adjacent service channels and service channels with high user preference, process a signal of the adjacent service channels when a channel up / down key is generated, and generate a service channel number when a channel up / down key is generated. A method of processing a signal of a service channel having a high user preference may be used.

First, a method of buffering signals of adjacent service channels performs channel search using a channel up / down key when changing a service channel. Therefore, the signal of the adjacent service channel (that is, the previous and / or next service channel of the current service channel) of the service channel currently being broadcasted is buffered. Accordingly, the broadcast data demodulator 120 demodulates service channel signals including the currently selected service channel, and the broadcast data storage unit 130 buffers the signal of the currently selected service channel and at least one adjacent service channel signal. The broadcast data decoder 140 decodes the signal of the service channel currently selected by the broadcast data storage unit 130 and reproduces the signal through the display unit 150 and the speaker 155. In this case, the broadcast data storage unit 130 buffers adjacent service channel signals of the currently selected service channel. Here, the size of the broadcast data storage unit 130 may be set to an appropriate size in consideration of the service channel change time of the user. At this time, when the user generates a channel up / down key or channel selection signal through the key input unit 170, the control unit 100 detects this and selects the buffered broadcast signal corresponding to the service channel selected by the broadcast data storage unit 130 to broadcast data. The broadcast data decoder 140 successively decodes the broadcast signal of the changed service channel, and the decoded broadcast signal is reproduced through the display unit 150 and the speaker 155. At this time, the control unit 100 detects the change of the selected service channel, controls the broadcast data demodulator 120 and the broadcast data storage unit 130 to change the number of the selected service channel and the adjacent service channel to prepare for the next service channel change.

The above method of changing a service channel can be used even when a user memorizes service channels desired by the user and sequentially searches for memorized service channel numbers using a channel up / down key. In this case, the controller 100 knows the service channel numbers memorized by the user, and after confirming the next service channel number and / or the previous service channel number memorized adjacent to the currently selected service channel number during the service channel processing, The identified service channel signals are buffered in the broadcast data storage unit 130 as signals of an adjacent service channel.

Secondly, in the method of buffering signals of service channels having high user preference, the channel search is performed using the service channel number when the service channel is changed. Accordingly, the controller 100 buffers a signal of a service channel currently being broadcast and at least one service channel preferred by the user. Accordingly, the broadcast data demodulator 120 demodulates service channel signals including the currently selected service channel, and the broadcast data storage unit 130 buffers the signal of the currently selected service channel and at least one service channel signal having a high user preference. The broadcast data decoder 140 decodes the signal of the service channel currently selected by the broadcast data storage unit 130 and reproduces the signal through the display unit 150 and the speaker 155. In this case, the broadcast data storage unit 130 buffers adjacent service channel signals of the currently selected service channel. Here, the size of the broadcast data storage unit 130 may be set to an appropriate size in consideration of the service channel change time of the user. At this time, when the user generates a channel selection signal through the key input unit 170, the control unit 100 detects this and checks whether the selected service channel number is the number of the service channel buffered in the broadcast data storage unit 130. In this case, if the selected service channel is a buffered service channel, the controller 100 selects a buffered broadcast signal corresponding to the service channel selected by the broadcast data storage unit 130 and transmits the buffered broadcast signal to the broadcast data decoder 140, and the broadcast data decoder 140 The broadcast signal of the changed service channel is decoded continuously, and the decoded broadcast signal is reproduced through the display unit 150 and the speaker 155. Thereafter, the controller 100 determines a service channel to buffer by analyzing user preferences after changing the service channel, and then controls the broadcast data demodulator 120 and the broadcast data storage 130 to change the number of the selected service channel and the determined service channel. Prepare for service channel changes.

As described above, in the first embodiment of the present invention, a digital broadcast receiver using one physical channel (that is, using one tuner) is adjacent to the reproduced service channel while playing a signal of a locally selected service channel. Buffers the signal of at least one other service channel, and reproduces and displays the signal of the buffered service channel when the service channel is changed. In a second embodiment of the present invention, at least one other service preferred by a user while processing and playing a signal of a locally selected service channel in a digital broadcast receiver using one physical channel (that is, using one tuner). It buffers the signal of the channel and reproduces and displays the signal of the buffered service channel when the service channel is changed.

Using the same service channel changing method as the first and second embodiments of the present invention, if the user selects a different service channel while watching a random service channel, the corresponding service channel corresponds to the buffered service channel. Play back buffered data of the service channel. Accordingly, the present invention can significantly reduce the service channel change time by buffering a signal of a service channel that is expected to change the service channel, and displaying the buffered service channel signal when the service channel is changed.

In the following description, it is assumed that the digital broadcast receiver shown in FIG. 1 is a digital broadcast receiver of the DVB_H method.

The DVB_H broadcast data demodulator 120 has the configuration as shown in FIG. 2, and the DVB_H data configuration has the configuration as shown in FIGS. 5A to 5F.

First, the DVB_H data mapping configuration of FIGS. 5A to 5F will be described. The DVB_H data has an MPEG2-TS structure. In FIG. 5A, each TS packet has a size of 188 bytes, and may include a packet header of 4 baht and a payload of 184 bytes. Here, the packet header has a size of 4 bytes and has packet sync and PID information. The PID may be used as information for identifying service channels and information for identifying a payload. FIG. 5B illustrates a configuration of an MPE section that can be carried in the payload of FIG. 5A, wherein the MPE section information includes table identification information (table_ID), information for error correction (MPE-FEC), and received data. May be composed of information for time slicing. 5C shows an example of using IP V6 as the configuration of the IP datagram. The IP datagram includes IP version information (such as IP V6 or IP V4), source IP address, destination IP information, and the like. 5D is UDP information and includes port addresses (Scr Prt, Dst Prt) of the calling and called party. FIG. 5E is a configuration of FLUTE / ARC, and includes an ESG (Electronic Sevice Guide), files, and the like. 5F is an RTP configuration, in which audio and video data are included.

2, the tuner 110 is connected to the front end of the broadcast data demodulator 120. The tuner 110 is a PLL for generating a frequency for setting a physical channel, a mixer for outputting a broadcast signal of a physical channel set by mixing a received broadcast signal and a physical channel frequency generated in the PLL, and a frequency of a set physical channel frequency band. And a band filter for filtering and outputting the signal.

The demodulation controller 240 controls the tuner 110 according to the channel control data output to the controller 100 to set the physical channel frequency of the selected service channel, and sets the PID of the selected service channel and the buffered service channels in the PID filter 230. Do this. In this case, the controller 100 analyzes the information (PSI / SI, SDP, etc.) processed by the broadcast data demodulator and the broadcast data decoder 140, and then checks the PID of the selected service channel and the buffered broadcast channels selected by the user. And control to select and store data of service channels according to the determined PID. Therefore, in the embodiment of the present invention, the control unit 100 may be a service channel change control unit.

The A / D converter 210 of the broadcast data demodulator 120 receiving the output of the tuner 110 converts the output signal of the tuner 110 into digital data, and the demodulator 220 demodulates the modulated broadcast signal into original data. The demodulator 220 may be configured as an OFDM or COFDM demodulator. In this case, the data demodulated by the demodulator 220 may be a TS packet stream of MPEG2-TS as shown in FIG. 5A, and the TS packet includes PID information that is an identifier for identifying a service channel. The PID filter 230 filters data having a PID of a selected and / or buffered service channel in the demodulated IP datagram, and transmits PSI / SI information to the controller 100. In addition, the TS data output from the PID filter 230 may include MPE-FEC (MultiProtocol Encapsulation-Forward Error Correction) and time slicing information as shown in FIG. 5B. Then, if the TS packet is data including the information as shown in FIG. 5B, the demodulation controller 240 performs time slicing control on the received burst data. That is, the demodulation controller 240 controls the power supply of the tuner 110 and the demodulator 220 using the time slicing information of FIG. 5B. In this case, the time slicing information includes burst on time information of the selection and buffering service channel, and the demodulation controller 240 uses the time slicing information to burst data of the selection and / or buffering service channel. Power is supplied to the tuner 100 and the demodulator 220 in the section, and the power supply is stopped in the other sections. In addition, the demodulation controller 240 performs MPE-FEC function on the data of the selection and buffering service channel output from the PID filter 230 using the MPE section information as shown in FIG. 5B.

As described above, the demodulation controller 240 controls the tuner 110 according to the channel control data output to the controller 100 to set the physical channel frequency of the selected service channel, and sets the selected service channel and the buffered service channels to the PID filter 230. Function to set PID. And MPE-FEC function to control the operation of time slicing (time slicing) to reduce the power consumption of the digital broadcast receiver by the MPE section information as shown in FIG. Do this. In this case, the data output from the demodulation controller 240 may be an IP datagram having a structure as shown in FIG. 5C.

Accordingly, the broadcast data demodulator 120 transmits the IP datagram having the structure as shown in FIG. 5C to the broadcast data storage 130, and the broadcast data storage 130 sets data of the buffered service channel under the control of the controller 100, respectively. Stored in the buffers, and selectively outputs data of the selected service channel. Then, the broadcast data decoder 140 processes the protocol of the IP datagram as shown in FIG. 5C output from the broadcast data storage 130, and then extracts and decodes the video and audio data.

3 is a diagram illustrating a configuration of a broadcast data storage unit 130 according to an embodiment of the present invention.

Referring to FIG. 3, the broadcast data storage unit 130 buffers data of a service channel selected by a user and data of buffered service channels used for changing a service channel among data of a service channel output from the broadcast data demodulator 120. do. The buffers 331 to 33N have more than the number of service channels to be buffered in the digital broadcast receiver. For example, if the number of service channels to be buffered is two, the buffer N may be configured to three or more. That is, a buffer for buffering data of a service channel selected by a user, and buffers for buffering two or more service channel data to be buffered in anticipation of a service channel change. In addition, the buffers 331 to 33N may be provided as many as the number of service channels that can be serviced by the digital broadcast receiver, and the buffers 331 to 33N may be configured to match corresponding service channels, respectively. The controller 100 generates a selection control signal for transmitting signals of the selection service channel and the buffering service channel to corresponding buffers, respectively. The first selector 320 selects the data of the service channel output from the broadcast data demodulator 120 under control of the controller 100 and transfers the data to the corresponding buffers. The second selector 340 controls the selected service channel under the control of the controller 100. The broadcast data output from the buffer for storing the data is selected and transmitted to the broadcast data decoder 140. The first selector 320 may be configured as a demultiplexer, and the second selector 340 may be configured as a multiplexer.

In addition, the broadcast data storage unit 130 may be configured as a memory. In this case, allocating regions having the same size as each of the buffers 331 to 33N, the first selector 320 may be implemented as a write address generator, and the second selector 340 may be implemented as a read address generator. That is, as many buffer areas as the number of buffering service channels are allocated to the memory, and a specific buffer area of the memory is allocated as a buffer area of the buffering service channel when the buffering service channel is set. When the data of the set buffering service channel is output from the broadcast data demodulator 120, the controller 100 may generate a write address so that the data of the demodulated service channel can be stored in the set area of the memory. The controller 100 generates and outputs a read address of a buffer that stores data of the selected service channel allocated to the memory. Accordingly, when the broadcast data storage unit 300 is configured as a memory, the functions of the selectors 320 and 340 may be implemented through the write and read addressing.

Referring to the operation of the broadcast data storage unit 130 having the above configuration, the control unit 100 knows the PID of the currently received service channel, and allocates buffers 331 to 33N for storing data of the selection and buffering service channel. I know the status. Accordingly, the controller 100 checks the PID of the received service channel and controls the first selector 320 so that data can be stored in a buffer corresponding to the received service channel. In addition, the controller 100 knows the PID of the selected broadcast channel. Accordingly, the controller 100 controls the second selector 340 so that the output of the buffer storing the data of the selected broadcast channel can be transmitted to the broadcast data decoder 140. In this case, the sizes of the buffers 331 to 33N may be set in consideration of the time for acquiring and processing the broadcast signal of the changed service channel when the service channel is changed. For example, in the case of the DVB_H scheme, the burst signal has a period between 1 second and 4 seconds. Accordingly, the size of the buffers 331 to 33N may be set to a size capable of storing service channel data received in the burst data section in the DVB_H scheme.

In addition, the controller 100 controls the first selector 320 according to the buffering method of the broadcast signal. First, when the buffering method is a method of buffering adjacent service channel signals of a selected service channel, the control unit 100 receives signals of a currently selected service channel output from the broadcast data demodulator 120 and service channels adjacent to the selected service channel. The first selector 320 is controlled to apply to the buffers 331 to 33N, respectively. In this case, the adjacent service channel may be the previous and / or next service channel of the selected service channel as described above. For example, when the adjacent service channel is the upper and lower service channels of the selected service channel, the received service channel data is in the order of the lower, the selected and the higher service channel. In this case, the controller 100 controls the first selector 320 in each burst data period to store data in the buffers corresponding to the lower, the selected, and the higher service channel, respectively.

Second, when the buffering method is a method of buffering signals of service channels having a high user preference, the control unit 100 sets the number of channels to be buffered and channel numbers having a high user preference, and then the broadcast data demodulator 120. The first selector 320 is controlled to select broadcast signals of the selected service channel and the set number of service channels having a high user preference and are applied to the buffers 331 to 33N. Third, when the buffering method is a method of buffering signals of the adjacent service channel and service channels with high user preference, the controller 100 controls the first selector 320 in the first and second manners to control each service channel. Signal can be applied to the buffers 331-33N.

The buffers 331 to 33N then buffer signals of the currently selected service channel and buffered service channels to be used when changing the service channel. The controller 100 controls the second selector 340 to apply a signal of a currently selected service channel to the broadcast data decoder 140.

When the change of the service channel occurs in the above state, the controller 100 controls the second selector 340 to buffer the signal of the changed service channel and to change the buffer of the buffer (331-33N that stores the changed service channel data). The output is controlled to be transmitted to the broadcast data decoder 140.

The controller 100 resets buffering service channels according to the changed service channel when the service channel is changed. In this case, the buffering service channel may be an adjacent service channel and / or a preferred service channel. Thereafter, the controller 100 sets the PIDs of the reset buffering service channels to the broadcast data demodulator 120 (in the DVB_H scheme, transmits the reset buffering PIDs to the demodulation controller 240, and the demodulation controller 240 controls the PID filter 230. The buffering PID is set) and the first selector 320 of the broadcast data storage unit 130 controls the data of the reset buffering service channel to be stored in a corresponding buffer.

4 shows an example of the configuration of a broadcast data decoder of the DVB_H method.

Referring to FIG. 4, the protocol processor 410 extracts video and audio data after processing IP and protocol information of the received selected service channel data. The video decoder 430 decodes the video data output from the protocol processor 410 and outputs the decoded video data to the display unit 150. The audio decoder 440 decodes the audio data output from the protocol processor 410 and outputs the decoded audio data to the speaker 155.

The protocol processor 410 may include an IP extractor 411, a UDP extractor 413, a FLUTE transmitter 415, an RTP transmitter 417, a demultiplexer 419, and the like.

Referring to the configuration of the protocol processor 410, the data of the selected service channel input to the IP decapsule module 411 is as shown in Figure 5c the source IP address (source IP address, IP datagram that contains the desination IP address. The IP extractor 411 extracts IP information by decapsulating the IP datagram. In addition, the UDP decapsule module 413 receives UDP information including a source port address & destination port address (Scr Prt & Dst Prt) as shown in FIG. 5D. The UDP extracting unit 413 extracts the port information. Thereafter, if the UDP-removed protocol data is FLUTE / ALC protocol data as shown in FIG. 5E, the received data is transmitted to a file transport (FLUTE) module 415. If the protocol is an RTP protocol, the RTP transmission unit (A / V) is used. transport (RTP / TRCP) module) 417. In the case of the FLUTE / ALC protocol, the data may be data (XML, SDP, HTML, JPG, POL, etc.) composed of an ESG or a file. In the case of the RTP protocol, the data may be audio and video data, and the demultiplexer 419 demultiplexes the video and audio data processed by the RTP protocol and outputs them to the corresponding video decoder 430 and the audio decoder 440, respectively. .

In this case, the controller 100 processes the protocols processed by the protocol processor 410. That is, the controller 100 may include an ESG engine (XML engine and ESG decoder), an SDP parser, a PSI / SI decoder, and the like, and include controllers and managers of the protocol information. Can perform process control and management functions of the protocol. The controller 100 processes each protocol information and data extracted and transmitted by the protocol processor 410. That is, the controller 100 may analyze PSI / SI information (NIT, SDT, EIT) extracted from the broadcast data demodulator 120 to check PSI / SI according to MPEG-2 and DVB-SI standards. Parses the SDP (main data set related to broadcasting) of ESG data delivered from and controls the overall operation of the digital broadcast receiver. At this time, the service channel, ESG, audio and video data of each service channel are identified by PID, IP information, and port information. That is, the PSI / SI and SDP include tables defining identifiers of the service channel, audio, video, and ESG identifier information of each service channel. Accordingly, the control unit 100 may distinguish a service channel and / or audio data and / or video data and / or ESG data with reference to the PSI / SI decoding result and the SDT. Herein, the controller 100 may include a protocol processor 410.

When the protocol processor 410 demultiplexes and outputs the video data and the audio data, the video decoder 430 decodes the demultiplexed video data and displays the demultiplexed video data on the display unit 150. The audio decoder 440 decodes the demultiplexed audio data. Playback on the speaker 155. The video decoder 430 may use an H.264 or MPEG decoder, and the audio decoder 440 may use an AAC decoder.

The digital broadcast receiver according to the embodiment of the present invention having the configuration described above buffers the signal of the service channel to be selected next in anticipation of the service channel change, and changes the service channel by processing the buffered signal when the service channel is changed. Can be performed quickly, and the service channel change screen can be displayed continuously without any interruption of the screen display at the point of service channel change. Hereinafter, a procedure of changing a service channel according to an embodiment of the present invention in a digital broadcast receiver will be described in detail. In the following description, a case of the digital broadcast receiver of the DVB_H method will be described as an example.

6A and 6E are diagrams for describing a method of buffering adjacent service channels and service channels having high user preferences in a digital broadcast receiver according to an embodiment of the present invention.

The DVB_H type digital broadcast receiver uses a time slicing technique to supply power only in a section where broadcast data is received and to reduce power consumption by turning off the power supply in a section where no song data is received. 6A is a diagram illustrating an example of receiving service channel data using a time slicing technique. 6A illustrates a case in which six service channels CH1 to CH6 are used for one physical channel, and the service channel selected by the user is CH3. In this case, a section in which the CH3 data is received is called a burst time, and the remaining sections CH4-CH6 and CH1-CH2 are called a burst off time. As shown in FIG. 6A, data of each service channel is repeatedly transmitted in a predetermined order (here, CH 1 to CH 6). Accordingly, the digital broadcast receiver can predict the burst time of the selected service channel and also predict the burst time of another service channel that is not selected. For example, assuming that the data of six service channels are multiplexed and transmitted to one physical channel as shown in FIG. 6A, and the service channel has a burst time of 1 second, the selected service channel data is transmitted for 1 second every 6 seconds. Is received. In this case, the burst time and the burst off time can be known, and the time slot to which the service channel is transmitted can be known (since the predetermined transmission order of the service channel data is known). Time-slicing control can be used to receive selected service channel data. In addition, the time slicing of the buffering service channel according to the embodiment of the present invention may be performed in the same manner as the time slicing control of the selected service channel. That is, when the demodulation controller 240 controls the buffering service channel in the same manner as the selection service channel control, the demodulation controller 240 may control the burst time of the buffering service channel.

6B-6D illustrate an example of buffering an adjacent service channel of a service channel currently being viewed according to an embodiment of the present invention.

When the CH2 service channel is selected while watching the service channel of CH3 as shown in FIG. 6A, the broadcast cannot be viewed until the CH2 data is acquired in the next burst data section. In this case, the screen is displayed on the display unit 150. You will not be able to. Therefore, when changing the service channel, the service channel cannot be changed until the burst of the service channel to be changed is acquired. As a result, the service channel change time is prolonged and the display disconnection occurs. Therefore, in order to reduce the service channel change time, the signal of the service channel which is expected to change the service channel is received in advance and buffered, and when the service channel is changed, the signal of the buffered service channel is processed and reproduced, and the service of the next burst during this time is changed. By receiving and processing the channel, the service channel change time can be shortened and the interruption of the broadcast screen displayed during the service channel change process can be prevented.

In general, a user of a digital broadcast receiver frequently changes to a higher service channel (next service channel) and a lower service channel (previous service channel) adjacent to a service channel currently being viewed. That is, while watching the service channel CH3, the user frequently changes to the service channel CH2 or CH4. Therefore, in the exemplary embodiment of the present invention, as shown in FIG. 6B, adjacent service channel signals of the currently viewed service channel are received in advance and stored in the broadcast data storage 130. That is, assuming that the service channel CH3 is selected as shown in FIG. 6B, adjacent service channels CH2 and / or CH4 are sometimes stored together. In this case, the number of adjacent service channels buffered may be set as needed. For example, the service channels buffered while the service channel CH3 is selected may be variably set by the user such as the service channels CH2 and / or CH4, CH1-CH2 and (EH) CH4-CH5. In this case, the broadcast data storage unit 130 should include buffers 331 to 33Ns that can buffer data of service channels according to a user's setting.

When buffering one of the upper and lower service channels of the currently selected service channel as shown in FIG. 6B, when the adjacent service channel CH2 or CH4 is selected while receiving the currently selected service channel CH3, the digital broadcast receiver provides a service. It can reduce the channel change time and perform the service channel change operation. If the service channel CH4 is selected while receiving the service channel CH3, the digital broadcast receiver receives and buffers the signals of the adjacent service channels CH3 and CH5 as shown in FIG. 6C. When the adjacent service channel signals are buffered as described above, power must be supplied in the reception period of the service channel and the adjacent service channel selected by the user as shown in FIG. 6D.

FIG. 6E is a diagram illustrating an example of buffering signals of service channels having high user preference according to an embodiment of the present invention.

In addition to the method of buffering the adjacent service channels as described above, the service channel registered by the user or the channel service channels frequently watched may be buffered. That is, a user who watches a digital broadcast can mainly watch service channels of a specific genre according to taste. Therefore, the service channels are registered in advance according to the user's taste or the user's viewing pattern is analyzed to identify and register the service channels most watched recently. When an arbitrary service channel is selected, the digital broadcast receiver stores the signals of the pre-registered service channels in the broadcast data storage 130. FIG. 6E is a diagram illustrating an example of buffering service channels CH2 and CH6 while watching service channel CH4. FIG. 6E illustrates an example in which CH2 and CH6 are configured as service channels having high user preference.

First, a procedure of performing a service channel change operation by previously storing signals of adjacent service channels of a selected service channel as shown in FIGS. 6B to 6D will be described.

7 is a flowchart illustrating a service channel change procedure according to the first embodiment of the present invention in a digital broadcast receiver.

Referring to FIG. 7, when the user selects a service channel through the key input unit 170, the control unit 100 refers to the SDT of the PSI / SI and / or ESG data in step 510 of the service channel selected by the user. A physical channel frequency is set, the selection service channel is set in step 520, and the buffering service channel is set in step 530. That is, when the user selects a service channel to be watched by the user, the controller 100 sets a physical channel frequency of the selected service channel, and sets the selected service channel and service channels to be buffered. The setting of the service channels to be buffered means allocating buffers for storing broadcast data to the PID and the broadcast data storage 130 of the service channel. The PID of the buffering service channel may be adjacent service channels of the selected service channel or PIDs of service channels having high user preference. In this case, the adjacent service channel and the preferred service channel may be set in advance or may be set when selecting a service channel.

Then, in the case of the DVB_H type digital broadcast receiver, when the control data for setting the frequency of the service channel is output from the control unit 100, the demodulation controller 240 detects this and sets the physical channel frequency in the tuner 110. Thereafter, the demodulation controller 240 sets a coding scheme, a coding rate, a guard interface, and the like in the demodulator 220. In addition, the demodulation controller 240 sets the PID of the service channel set by the user in the PID filter 230. In this case, the controller 100 sets PIDs of the buffering service channel in addition to the PID of the set service channel.

When the service channel playback mode is requested as described above, the controller 100 determines the physical channels and the buffered service channels of the selected service channel in steps 510 to 530, and proceeds to step 540 to perform the broadcast playback mode. When the broadcast play mode is performed, the broadcast data demodulator 120 converts the output of the tuner 110 into digital data, OFDM (or COFDM) demodulates the digitally converted data, and receives data having a PID set among the demodulated data. To filter. At this time, if the PID matches, the data of the corresponding service channel is stored in the allocated buffer area of the broadcast data storage unit 130. However, if the PID does not match, the signals of the corresponding service channels are not filtered. That is, the demodulation controller 240 controls to demodulate the data of the selection and buffering service channel by time-slicing the tuner 110 and the demodulator 220 at the burst time of the selection and buffering service channel, and controls the demodulated data in the MPE-FEC. By correcting, an IP datagram as shown in FIG. 5C is generated. The broadcast data storage unit 130 stores the IP datagrams of the selection and buffering service channels received under the control of the controller 100 in the allocated buffers. In addition, the broadcast data storage unit 130 outputs data of the selected service channel to the broadcast data decoder 140 under the control of the control unit 100, and the broadcast data decoder 140 processes IP information in the IP datagram and decodes video and audio data. Playback through the display unit 150 and speaker 155, respectively. The above operation is performed at the burst time at which the data of the selection and buffering service channel is received, and the tuner 110 and the broadcast data demodulator 120 at the burst off time (a section in which service channel data other than the selection and buffering service channel is received). Stops the receiving operation. The above operation is repeatedly performed until the broadcast play mode ends.

FIG. 8 is a flowchart illustrating a procedure of buffering a signal of a neighbor channel of a selected service channel and a reproduction of a selected service channel according to the first embodiment of the present invention.

Referring to FIG. 8, when broadcast data is received, the controller 100 detects this in step 611 and checks whether the PID of the received service channel is the PID of the selected service channel. In this case, in case of the PID of the selected service channel, the controller 100 detects this in step 613, processes the protocol included in the IP datagram of the service channel selected in steps 615 and 617, and extracts audio and video data. In step 621, the extracted audio and video data are decoded, and the decoded video and audio data are reproduced through the display unit 150 and the speaker 155. That is, if the data of the received service channel is the data of the selected service channel, the controller 100 extracts audio and video data after processing a protocol including IP information from the data of the demodulated service channel, and extracts the extracted audio and video data. And decoding and reproducing the video data, respectively.

If the received data of the service channel is not the PID of the selected service channel in step 613, the controller 100 checks whether the data of the service channel received in step 631 is the PID of the service channel to be buffered. The PID to be buffered may be a PID of an adjacent service channel of the selected service channel. Accordingly, the controller 100 checks whether the received PID is the PID of the higher service channel in step 633. If the PID of the service channel is the PID of the higher service channel, the controller 100 stores the IP datagram of the service channel having the higher service channel PID in step 635, and if the lower service channel PID is the lower service channel in step 637. Stores IP datagram of service channel with PID. That is, when the currently selected service channel is CH3 as shown in FIG. 6B, if the received PID is the PID of CH4, the control unit 100 detects it in step 633 and controls the broadcast data storage unit 130 to control the received service channel data of CH4. Buffer If the received PID is the PID of CH2, the control unit 100 detects this in step 633 and controls the broadcast data storage 130 to buffer the received service channel data of CH2. Here, the case of buffering data of the upper and / or lower service channel and the case of buffering one service channel data is described as an example, but two or more service channels (---, CHn, CH1, CH2 and (or ) You can also buffer the data of CH4, CH5, ---).

If a service channel change occurs while playing the data of the selected service channel as described above, the control unit 100 detects it in step 621 and proceeds to step 550 to perform a procedure for changing the service channel. In this case, the controller 100 can quickly change the service channel by reproducing the data of the buffered service channel. In addition, if a key input for terminating broadcast viewing is generated while playing the selected service channel data, the control unit 100 detects it in step 625 and terminates the reproduction process of the service channel data.

Accordingly, the controller 100 buffers data of adjacent upper and lower service channels while playing broadcast data of a selected service channel. The buffered upper and lower service channel data may be used when changing a service channel.

In step 540, the controller 100 reproduces the signal of the service channel selected by the user and simultaneously buffers data of upper and / or lower service channels adjacent to the selected service channel. The buffered data quickly changes the service channel when changing the service channel. If the user generates an input for selecting another service channel through the key input unit 170 (channel up / down key or numeric key) in step 540, the control unit 100 detects this and the service channel change procedure in step 550. After performing the process, the process proceeds to step 540 again to perform the procedure of reproducing the data of the changed service channel.

9 is a flowchart illustrating a procedure of storing data of a service channel and buffering service channels for use in changing a service channel to an adjacent service channel in a broadcast reproduction mode according to an embodiment of the present invention.

Referring to FIG. 9, in step 651, the controller 100 sets the PID of the changed broadcast channel to the PID of the selected broadcast channel, selects and outputs data stored in the buffer of the changed broadcast channel. Then, the broadcast data decoder 140 continuously reproduces the data of the changed broadcast channel, thereby allowing the viewer to continuously watch the data of the changed service channel without feeling interruption of the broadcast.

In step 653, the control unit 100 checks whether the changed service channel is a higher service channel of a previously played service channel. In this case, the control unit 100 detects this in step 653, deletes the previous lower service channel PID in step 655, and sets the upper service channel PID of the changed service channel as a buffering PID in step 657. That is, if the changed service channel is higher than the previously played service channel, the control unit 100 sets the changed service channel as the selected service channel in steps 655 and 657 and is adjacent to the changed service channel. The upper and / or lower service channels are identified and configured as buffering service channels. However, if the changed service channel is a lower channel of the previously played service channel, the control unit 100 detects this in step 653, releases the previous upper channel PID in step 659, and in step 661 the lower service of the changed service channel. Set the channel PID to the buffering PID. That is, if the changed service channel is a lower service channel than the previously played service channel, the control unit 100 sets the changed service channel as the selected service channel in steps 659 and 661 and adjacent to the changed service channel. The upper and / or lower service channels are identified and configured as buffering service channels.

For example, if the user selects CH4 while playing the data of CH3 and buffering the data of CH2 and CH4 as shown in FIG. 6B, the controller 100 detects that the changed service channel is an upper service channel in step 653. In step 655, the PIDs of the lower service channels CH2 and CH4 buffered are released, and the PIDs of the upper service channels CH3 and CH5 are set as the buffering PIDs. In addition, when the user selects CH2 while reproducing the data of CH3 and buffering the data of CH2 and CH4 as shown in FIG. Releases the PIDs of the upper service channels CH2 and CH4 that were buffered at, and sets the PIDs of the lower service channels CH1 and CH3 as the buffering PID.

When the PIDs of the upper and / or lower service channels adjacent to the changed service channel are set as the buffering PID, the broadcast data demodulator 120 selects and buffers the PIDs of the changed service channel and the reset buffered service channels, respectively. The PID is set and the broadcast data storage unit 130 reallocates buffers for storing data of the changed service channels. In addition, the controller 100 sets the buffer of the changed service channel as the buffer of the selected service channel, thereby reproducing the data of the changed service channel being stored during the service channel change (that is, until the next burst data of the changed service channel is received). You can also After performing the service channel change procedure, the controller 100 proceeds to step 540 of FIG. 7 to perform a broadcast play mode.

When the service channel is requested to be changed while watching the broadcast as described above, referring to the service channel change operation with reference to FIGS. 1 to 4, the controller 100 controls the broadcast data storage 130 when the service channel is changed. Select and output the data buffering the service channel data requested for change. That is, the controller 100 controls the second selector 340 to select the output of the buffer buffering the data of the changed service channel and to apply it to the broadcast data decoder 140. Accordingly, when the service channel is changed, the digital broadcast receiver according to the embodiment of the present invention can reproduce data of a service channel which is continuously changed without interruption of broadcast data reproduction.

In this case, the reproduced data is the data buffered in the broadcast data storage unit 130, and the reproduction time depends on the size of the buffered data. In general, the burst data of the service channel may be generated with a period of 1 to 4 seconds, and sets the sizes of the buffers 331 to 33N. The controller 100 changes PIDs of the selected service channel (in this case, the changed service channel) and the upper and / or lower service channels adjacent to the service channel while reproducing the buffered data when the service channel is changed. You must also change the location of the buffer to buffer. Therefore, the size of the buffers 331 to 33N is preferably set to a size that satisfies the time that can normally be buffered by performing the next burst data when the service channel is changed.

In the state of reproducing the buffered data as described above, the controller 100 checks whether the currently changed service channel is the upper service channel or the lower service channel of the previously selected service channel. At this time, if the changed service channel is an upper service channel, the controller 100 releases previous buffering PIDs and sets upper service channel PIDs of the released PIDs as buffering PIDs. If the changed service channel is a lower service channel, the controller 100 releases previous buffering PIDs and sets lower service channel PIDs of the released PIDs as buffering PIDs. For example, when the data of CH3 is reproduced as described above and the data of the channels CH2 and CH4 are buffered and the channel is changed to CH4, which is an upper channel, the control unit 100 controls the data of the channels CH4 and CH3 and CH5 in the demodulator 220. Outputs control data for filtering. The demodulation controller 240 of the broadcast data demodulator 120 then releases the previous service channel PID to the PID filter 230 and controls to filter service channel data having a PID of CH3-CH5. In addition, when changing to the lower channel CH2, the control unit 100 outputs control data for filtering the data of the CH2 and CH1 and CH3 in the demodulator 220. The demodulation controller 240 of the broadcast data demodulator 120 then releases the previous service channel PID to the PID filter 230 and controls to filter service channel data having a PID of CH 1 to CH 3.

In addition, the control unit 100 selects and applies data of a service channel having a buffering PID and a changed service channel PID so that data of service channels corresponding to the buffers 331 to 33N may be buffered, respectively. Then, the data of the changed service channel and the changed buffering service channel are stored in the buffers 331 to 33N.

When the service channel is changed as described above, PIDs of the changed service channel and adjacent upper and lower service channels are set, and input / output selection of the buffers 331 to 33N is changed, so that the broadcast data demodulator 120 demodulates data of the changed service channels. In addition, the broadcast data storage unit 130 can quickly change the service channel by selecting and outputting the buffered data of the changed service channel, and also the data of the changed service channel and the upper and / or lower service channels adjacent thereto. Select them so that they can be buffered in their corresponding buffers. Accordingly, data of the changed service channel can be continuously reproduced by demodulating and buffering data of the continuously changed service channel in the state of reproducing the buffered data, and also upper and / or lower service channels adjacent to the changed service channel. By buffering their data, the service channel change procedure can be quickly performed in the same way even in the next service channel change.

The first embodiment of the present invention discloses an apparatus and method for performing a service channel change by buffering data of service channels adjacent to a selected service channel as described above. A second embodiment of the present invention discloses an apparatus and method for performing a service channel change by buffering data of a service channel having a high user preference. The structure of the digital broadcast receiver according to the second embodiment has the same configuration as that of FIG. 1, and has the same configuration as that of FIGS. 2 to 4 in the DVB_H method. The main procedure for processing and changing data of the service channel may be performed by the same procedure as that of FIG. 7. However, the method of performing the broadcast viewing procedure of step 540 and the method of changing the service channel of step 550 are performed in another method in FIG. 7.

FIG. 10 is a flowchart illustrating a procedure of buffering data of reproduction and preferred service channels of a selected service channel according to a second embodiment of the present invention.

In general, viewers prefer a particular genre of broadcasts. That is, male viewers prefer sports service channels, female viewers prefer drama or movie service channels, and young viewers such as students prefer service channels such as music and games. Accordingly, if the preferred service channels are preset and registered in the digital broadcast receiver, and the viewer searches for the preferred service channels during the service channel search, the service channel can be quickly changed.

Referring to FIG. 10, when broadcast data is received, the control unit 100 detects this in step 711, and checks whether the received service channel PID is the PID of the selected service channel in step 713. In this case, in case of the PID of the selected service channel, the controller 100 reproduces data of the service channel while performing steps 715 to 725. The operations 715 to 725 are performed in the same manner as the operations 615 to 625 of FIG. 8.

However, if the received data of the service channel is not the PID of the selected service channel in step 713, the controller 100 checks whether the data of the service channel received in step 731 is the PID of the service channel to be buffered. Here, the PIDs to be buffered may be PIDs of service channels having high user preference. The determination of the service channels having a high user preference may be set by the user, and the controller 100 may analyze and determine the service channel selection of the user. In addition, the number of service channels having high user preference may be variably set as necessary, and may also be determined by the number of buffers 331 to 33N of the broadcast data storage unit 130.

If the received PID is not the PID of the selected service channel, the controller 100 checks whether the received PID is the PID of the preset preferred service channel in step 733. In this case, if the PID of the received service channel is the PID of the preferred service channel, the control unit 100 detects it in step 731 and performs the steps 733 and 737 while the buffer determined to store data of the corresponding preferred service channel (buffer). A buffer configured to store the data of the preferred service channel among the 331-33N), and store the data of the preferred service channel in the checked buffer while performing corresponding steps 735 or 739 respectively. That is, the controller 100 can know the PID of the buffering service channel output from the broadcast data demodulator 120, and the broadcast data storage unit 130 allocates buffers corresponding to the PIDs of the buffering service channel. Accordingly, the controller 100 controls the first selector 320 of the broadcast data storage 130 to store data in a buffer corresponding to the PID of the service channel. If CH4 is the selected service channel and CH2 and CH6 are set as the preferred service channel as shown in FIG. 6E, when the service channel data having the PID of CH4 is received, the control unit 100 performs steps 715 to 725 while the CH4 service is performed. When reproducing channel data and receiving service channel data having a PID of CH2 or CH6, steps 733 to 735 or 737 to 739 are performed, and data of the corresponding preferred service channel are respectively mapped to the broadcast data storage 130. Buffer to buffer

In step 540, the control unit 100 reproduces the signal of the service channel selected by the user and buffers data of the selected service channel and the preferred service channels as shown in FIG. The buffered data quickly changes the service channel when changing the service channel. When the user generates an input for selecting another service channel through the key input unit 170 in step 540, the control unit 100 detects this and performs a service channel change procedure in step 550, and then returns to step 540. Proceed with the procedure to play the data of the changed service channel.

11 is a flowchart illustrating a procedure of changing a service channel and a buffering service channel to be reproduced when a service channel is changed according to the second embodiment of the present invention.

Referring to FIG. 11, the controller 100 checks whether a service channel changed by the user is a preferred service channel. If the change service channel is the preferred service channel, the control unit 100 detects this in step 751 and starts playing the data buffered in the buffer of the change service channel in step 753, and selects the change service channel in step 755. Set to service channel. That is, when the service channel requiring the change is set as the preferred service channel, the controller 100 selects and decodes the data buffered in the buffer of the service channel to be changed, so that the user is changed from the screen of the previous service channel when the service channel is changed. The broadcast screen of the service channel can be viewed continuously.

In step 757, the controller 100 checks whether the previous service channel is the preferred service channel. If the service channel is the preferred service channel, the controller 100 sets the previous service channel as a buffering service channel in step 759, and if the service channel is not the service channel, in step 761. Release the channel PID. That is, after setting the PID of the changed service channel, the controller 100 checks the previous selected service channel and sets the buffering service channel if the service channel is the preferred service channel, and releases the PID of the service channel if it is not the preferred service channel.

However, if the change service channel is not the preferred service channel in step 751, the controller 100 sets the PID of the change service channel as the PID of the selected service channel in step 763. The controller 100 performs steps 757 to 765 to process the previous selected service channel. In this case, since the changed service channel data does not exist in the broadcast data storage unit 130 (that is, since there is no stored data of the landscape service channel), the reproduction of the data is performed when the data of the selected service channel is burst time (i.e., next). Burst time).

For example, if the user selects CH2 (or CH6) while reproducing the data of CH4 and buffering the data of CH2 and CH6 as shown in FIG. 6E, the controller 100 determines that the changed service channel is the preferred service in step 751. In step 753, the controller detects the channel and accesses and plays the data of the changed service channel buffered in the corresponding buffer of the broadcast data storage unit 130, and sets the CH2 (or CH6) as the selected service channel. Since the previous selected service channel CH4 is the preferred service channel, it is set as a buffering service channel. However, if a service channel other than the preferred service channel (eg, CH3) is selected in the state of reproducing the data of CH4, the controller 100 sets the CH3 service channel as the selected service channel and buffers the CH4 service channel. Set to the service channel. In addition, when a service channel (eg CH1) is not registered as the preferred service channel while playing a service channel (eg CH3) that is not registered as the preferred service channel, the control unit 100 selects the CH1 service channel. Set to and release the PID of the CH3 service channel. In this case, the buffering service channels CH2, CH4, and CH6 are maintained as buffering service channels.

When the change of the service channel is required in the state of buffering data of the preferred service channels as described above, the operation of changing the service channel will be described with reference to FIGS. 1 to 4. In the service channel change method according to the second embodiment of the present invention, four cases may occur. The first case is when the change service channel is the preferred service channel and the previous selected service channel is the preferred service channel. The second case is when the change service channel is the preferred service channel and the previous selected service channel is the non-preferred service channel. The third case is when the change service channel is a non-preferred service channel and the previous selected service channel is a preferred service channel. Fourth, the change service channel is a non-preferred service channel, and the previous selected service channel is a non-preferred service channel.

First, referring to the first service channel change procedure, the control unit 100 detects that the change service channel and the previous selected service channel are both preferred service channels, and first controls the second selector 340 of the broadcast data storage unit 130 to change the change. Select the output of the buffer that buffers the data of the service channel. The broadcast data demodulator 120 is controlled to maintain the PID set state of the preferred service channels as it is, and the first selector 320 of the broadcast data storage 130 is controlled to correspond to buffers 331 to 33N corresponding to the data of the preferred service channels, respectively. To be buffered. Therefore, when the service channel is changed, the output of the buffer buffering the data of the changed service channel is applied to the broadcast data decoder 140 through the second selector 340. Accordingly, the broadcast data decoder 140 continuously changes the data of the changed service channel when the service channel is changed. The decoded data is reproduced through the display unit 150 and the speaker 155. When the next burst data is received, the broadcast data demodulator 120 filters the service channel data having the PIDs of the set preferred service channels and applies them to the broadcast data storage 130, and the broadcast data storage 130 to the first selector 320. The data of each preferred service channel distributed by the buffer is buffered in the corresponding buffers 331 to 33N, respectively. In this case, the second selector 340 selects and outputs the data of the changed service channel as data of the selected service channel. Therefore, the broadcast data decoder 140 processes the buffered service channel data when the service channel is changed, and subsequently processes the received service channel data, so that the user can watch the continuous broadcast screen without interruption even when the service channel is changed. Will be.

Looking at the second service channel change procedure, the control unit 100 detects that the changed service channel is the preferred service channel and the previous selected service channel is a non-preferred service channel, and controls the second selector 340 of the broadcast data storage unit 130. Select an output of a buffer that buffers data of the modified service channel. The broadcast data demodulator 120 is controlled to maintain the PID set state of the preferred service channels and release the PID of the previously selected service channel. The first selector 320 of the broadcast data storage unit 130 is controlled so that the data of the preferred service channel can be buffered in the corresponding buffers 331 to 33N, respectively. Therefore, when the service channel is changed, the output of the buffer buffering the data of the changed service channel is applied to the broadcast data decoder 140 through the second selector 340. Accordingly, the broadcast data decoder 140 continuously changes the data of the changed service channel when the service channel is changed. The decoded data is reproduced through the display unit 150 and the speaker 155. When the next burst data is received, the broadcast data demodulator 120 filters the service channel data having the PIDs of the set preferred service channels and applies them to the broadcast data storage 130, and the broadcast data storage 130 to the first selector 320. The data of each preferred service channel distributed by the buffer is buffered in the corresponding buffers 331 to 33N, respectively. At this time, since the PID of the previous selected service channel is released, the broadcast data storage unit 130 does not buffer the data of the previous selected service channel. In the case of the second service channel change method as described above, the broadcast data decoder 140 processes the service channel data buffered when the service channel is changed, and subsequently processes the service channel data received. When changing channels, it is possible to watch a continuous broadcast screen without interruption.

Looking at the third service channel change procedure, the control unit 100 detects that the changed service channel is a non-preferred service channel, the previous selected service channel is a preferred service channel, and controls the second selector 340 of the broadcast data storage unit 130 to control the service channel. Select the buffer where the data of the change service channel is buffered. In this case, since the actual data may not exist in the buffer, the broadcast screen may not be reproduced on the display units 150 and 155. In addition, the control unit 100 controls the broadcast data demodulator 120 to maintain the PID set state of the preferred service channels and set the PID of the changed service channel. The first selector 320 of the broadcast data storage unit 130 is controlled so that the data of the preferred service channels and the changed service channel can be buffered in corresponding buffers 331 to 33N, respectively. In the third method of changing a service channel as described above, the display of the broadcast screen may be stopped while the next burst data is received and decoded.

Referring to the fourth service channel change procedure, the control unit 100 detects that the change service channel and the previous selected service channel are non-preferred service channels, and the second selector 340 of the broadcast data storage unit 130 controls the data of the change service channel. Selects the buffer to be buffered. In this case, since the actual data may not exist in the buffer, the broadcast screen may not be reproduced on the display units 150 and 155. In addition, the controller 100 controls the broadcast data demodulator 120 to maintain the PID set state of the preferred service channels as it is, set the PID of the changed service channel, and release the PID of the previous selected service channel. The first selector 320 of the broadcast data storage unit 130 is controlled so that the data of the preferred service channels and the changed service channel can be buffered in corresponding buffers 331 to 33N, respectively. In the third method of changing a service channel as described above, the display of the broadcast screen may be stopped while the next burst data is received and decoded.

In the third and fourth service channel changing methods, the broadcast screen displayed at the time of changing the service channel may be suspended. In this case, multimedia data for displaying a broadcast screen when a service channel is changed is stored in a specific buffer among the buffers 331 to 33N, and when an unfavorable service channel is selected, an output of a buffer for storing the multimedia data is selected and displayed. can do. In this case, it is possible to prevent the display screen from being interrupted by displaying a specific multimedia screen while data of the selected service channel is received and processed at the time of changing the service channel. In addition, the data displayed when the service channel is changed may be stored in the memory 160 without being stored in a specific buffer of the broadcast data storage unit 130. In this case, the size of the multimedia data displayed when the service channel is changed may be set in consideration of the service channel change time.

As described above, in the second embodiment of the present invention, the service channels having high user preferences are registered and registered in advance by the user's setting or analysis of the controller, and buffering the data of the preferred service channel when watching broadcasting. The service channel can be changed quickly without interrupting the screen displayed when changing the channel.

As described above, the first embodiment of the present invention buffers data of adjacent service channels of the selected service channel, the second embodiment buffers data of service channels with high preference, and changes the service channel after the changed service channel. The service channel change is performed quickly by reproducing the data of the buffered service channel until the burst data is received. Accordingly, by reproducing the buffered data until the changed service channel data is received when the service channel is changed, the user can watch the broadcast screen without interruption at the time of changing the service channel. A third embodiment of the present invention buffers data of adjacent service channels of the selected service channel and service channels with high user preference. The user can use the channel up / down keys when changing the service channel, and can also use the numeric keys or the memory key for setting the preferred service channel. In this case, since the channel up / down key generally scans a channel while increasing or decreasing a service channel number, it is preferable to use a method of changing a service channel according to the first embodiment of the present invention. In the case of scanning, it is preferable to use the service channel change method according to the second embodiment of the present invention. Therefore, when the service channel is changed in the digital broadcast receiver, it may be useful to use a service channel change method combining the first and second embodiments of the present invention.

The service channel change procedure according to the third embodiment of the present invention may proceed with the procedure as shown in FIG. In FIG. 7, the broadcast viewing procedure of step 540 may be performed in the same manner as in FIG. 12, and the service channel change procedure of step 550 may be performed in the same manner as in FIG. 13.

12 is a flowchart illustrating a method of changing a service channel by buffering data of the adjacent service channels and preferred service channels having high user preference.

Referring to FIG. 12, if the PID of the service channel is inspected by checking the PID of the received service channel, the control unit 100 processes and displays service channel data received while performing steps 811 to 825. In this case, operations 811 to 825 are performed by the same procedure as operations 611 to 625 of FIG. 8. However, if the PID of the received service channel is not the PID of the selected service channel, the controller 100 checks whether the PID of the buffered service channel is found in step 631. If the PID of the received service channel is the PID of the buffering service channel, the controller 100 detects this and checks whether the buffering service channel is an adjacent service channel or a preferred service channel in step 833. If the buffering service channel is an adjacent service channel, the control unit 100 stores service channel data in a corresponding buffer of the adjacent service channel in step 835. In this case, the data buffering of the adjacent service channel may be performed in the same procedure as in steps 633 to 637 of FIG. 8. If the buffering service channel is the preferred service channel, the controller 100 detects it in step 833 and stores the data of the preferred service channel in the corresponding buffer in step 837.

FIG. 13 illustrates a procedure for changing a service channel when a request for changing a service channel occurs while watching a broadcast.

Referring to FIG. 13, the controller 100 detects a change request of a service channel, and checks whether the change service channel is a buffering service channel in step 851. In this case, the controller 100 selects and outputs the buffered data of the changed service channel in step 853. Then, the data of the changed service channel is reproduced through the display unit 150 and the speaker 155. In step 855, the controller 100 checks whether the changed service channel is an adjacent service channel or a preferred service channel. In this case, in step 857, the controller 100 resets the PIDs and the buffers of the adjacent service channels according to the change of the service channel. At this time, the resetting of the adjacent service channels may be performed by the same procedure as in steps 653 to 661 of FIG. 9. If the changed service channel is the preferred service channel, the controller 100 detects this and resets the PID and the buffer of the previous selected service channel in step 859. At this time, the resetting of the preferred service channel may be performed by the same procedure as in steps 757 to 761 of FIG. 11. If the change service channel is not the buffering channel, the control unit 100 sets the change service channel as the selection service channel in step 861 and proceeds to step 859 to reset the PID and the buffer of the previous selection service channel.

In this case, when configuring the buffering service channel, the adjacent service channel and the preferred service channel may overlap. In this case, the controller 100 may select one buffer from the buffers 331 to 33N of the broadcast data storage 130 and buffer the corresponding service channel data. As a method for solving this problem, one method may first use a method of resetting the adjacent service channel to the buffering service channel by checking whether it is a preferred service channel. In another method, when resetting a preferred service channel to a buffering service channel, a method of resetting the preferred service channel to a buffering service channel may be used. In the embodiment of the present invention, it is assumed that the buffering service channel is reset by the electronic method.

FIG. 14 illustrates a procedure of checking adjacent service channels to be changed when the buffering service channel is reset and resetting to the buffering service channel. When the control unit 100 determines that the service channel requiring the service channel change is the PID of the buffering service channel, the controller 100 first checks adjacent service channels. If the adjacent service channel is present, the controller 100 maintains the PID and the buffer of the preferred service channel as it is if there is a preferred service channel among the adjacent service channels, and resets the PID and the buffer of the service channel only when the non-preferred service channel is present. Use the method.

Referring to FIG. 14, if the changed service channel is an adjacent higher service channel, the controller 100 detects this in step 871, and checks in step 873 whether the previous lower service channel PID is a preferred service channel. At this time, if the previous lower service channel PID is the preferred service channel, the previous lower service channel PID and the buffer setting are maintained without being released. In the case of the non-preferred service channel, the previous lower service channel PID and the buffer setting are released. In addition, in step 877, the control unit 100 checks whether the higher service channel of the changed service channel is the preferred service channel, and if the preferred service channel maintains the service channel PID and the buffer setting as it is, proceeds to step 879 only for the non-preferred service channel. Set PID and buffer of changed upper service channel.

If the changed service channel is an adjacent lower service channel, the control unit 100 detects this in step 871, and checks in step 881 whether the previous higher service channel PID is a preferred service channel. In this case, if the previous upper service channel PID is the preferred service channel, the previous upper service channel PID and buffer settings are maintained without being released. In the case of the non-preferred service channel, the previous upper service channel PID and buffer settings are released in step 883 only. In addition, in step 885, the control unit 100 checks whether the lower service channel of the changed service channel is the preferred service channel, and if the preferred service channel maintains the service channel PID and buffer settings, and proceeds to step 887 only for the non-preferred service channel. Set PID and buffer of the changed lower service channel.

1 to 14 illustrate the DVB_H digital broadcast receiver as an example. However, the above service channel changing method may be applied to all general digital broadcast receivers. Fig. 15 is a diagram showing the configuration of another digital broadcast receiver.

Referring to FIG. 15, the controller 900 controls the overall operation of the digital broadcast receiver. The key input unit 980 generates key data according to a user's selection and applies it to the controller 900. The memory 970 may be configured of a program memory for storing a program for controlling the operation of the digital broadcast receiver and a data memory for storing data generated during program execution. The program memory of the memory 970 may include a program for performing a buffering operation for changing a service channel according to an embodiment of the present invention. Therefore, the control unit 900 performs the function of the service channel change control unit as described above in the embodiment of the present invention. The controller 900 controls the operation of the digital broadcast receiver by analyzing key data generated by the key input unit 980. That is, the controller 900 controls the operation mode (playback, recording, channel selection and change, etc.) of the digital broadcast receiver according to the user's selection.

The tuner 910 sets a physical channel frequency of a service channel selected by a user under the control of the controller 900, and receives a broadcast signal of the set physical channel. The broadcast data demodulator 920 demodulates the broadcast signal of the physical channel output from the tuner 910. In this case, the broadcast data demodulator 920 demodulates and outputs a plurality of service channel signals included in a physical channel. The demultiplexer 930 demultiplexes the data having the PID of the selected service channel under the control of the controller 900. The broadcast data storage unit 940 buffers data of a service channel demultiplexed by the demultiplexer 930 under the control of the controller 900. The broadcast data decoder 950 decodes and outputs a signal of a selected service channel output from the broadcast data storage 940. The broadcast data decoder 950 may be composed of video and audio decoders, and the decoded video and audio signals are applied to the display unit 960 and the speaker 965 and reproduced.

As described in FIG. 15, the DVB_T and DMB schemes have many differences from the DVB_H scheme. Among the above-mentioned differences, the DVB_T and DMB digital broadcast receivers do not include IP information in the received service channel data, and do not perform a PID filtering function in the broadcast data demodulator 920. Accordingly, the digital broadcast receiver having the configuration as shown in FIG. 15 must perform PID filtering of the selected service channel and the buffering service channel in the demultiplexer 930. The broadcast data storage unit 940 is connected to the rear end of the demultiplexer 930 to buffer data of a selected service channel and a buffered service channel demultiplexed to the demultiplexer 930. In addition, service channel data of the DVB_T and DMB broadcasts may not be received as burst data. That is, the burst data refers to data received at predetermined time intervals. Therefore, in the case of the digital broadcast receiver, the operating power can be supplied to the receiver in accordance with the timing of receiving the burst data. However, if the burst data is not received as described above, the digital broadcast receiver should analyze the service channel identifier when receiving the broadcast data to determine whether it is a selection and buffering service channel. Accordingly, the digital broadcast receiver which does not use the time slicing method always checks the selected service channel, and the buffering service channels can check while updating the identifier of the buffering service channel in a set time unit. In this case, the buffering service channel may be updated to the next buffering service channel every set time interval (for example, 1 second, 2 seconds, 3 seconds ...).

First, an operation of selecting a selected service channel and a buffering service channel in the demultiplexer 930 and demultiplexing data of the selected service channels will be described. In the following description, it is assumed that the DVB_T digital broadcast receiver is assumed.

 The MPEG2 TS signal is a TS packet stream as described above, and is composed of video packets and audio packets, wherein the video and audio packets are multiplexed and transmitted by the digital broadcast transmitter. In this case, the video and audio packet is composed of a packet header and payload (additional information and / or PES header (Packet Elementary Stream header) and / or A / V data), and the packet header and payload are 188 bytes. It consists of. At this time, the packet header has a size of 4 bytes, and each parameter of the packet header has a function as shown in Table 1 below.

Classification Explanation bits  sync byte  Sync byte, 0X47 8 transport error
indicator  If an error occurs in the current packet: 1 One payload start
indicator  If the current packet is the beginning of a PES: 1 One  transport priority  used in decoder One  PID  Identifier that identifies the type of packet 13  scrambling control  set scrambling mode 2 adaptation field
control 01: No additional information / Payload only
10: only additional information is present / no payload
11: Both side information and payload are present
00: spare 2  continuity counter  4 byte counter, 1 increase for same PID 4

That is, packet data starts with a sync byte, and distinguishes one packet based on this. The demultiplexer 930 sets PIDs of a selected and buffered broadcast channel by the controller 100. Accordingly, the demultiplexer 930 detects the sync byte, analyzes the packet header, and selects and processes data of the selected service channel and the buffered service channels. That is, the demultiplexer 930 compares the PIDs of the set service channels with the PIDs of the received packets and determines whether to process the received packet. If the packet is different from the set PID, the demultiplexer 930 does not process the packet. If the packet has the same value as the set PID, the packet header is analyzed to determine whether additional information (adaptation field control) is included. In this case, after analyzing the adaptation field control parameter of the packet header, the additional information processing is performed if the packet does not include the additional information (that is, a packet composed of PES header and / or A / V data). Omit the operation. When the packet does not include additional information as described above, the PES header and / or A / V data is stored in the payload area.

Accordingly, the control unit 100 sets PIDs of a selected service channel and a buffering service channel to the demultiplexer 930, and the demultiplexer 930 analyzes packet headers of packet streams of the MPEG2_TS standard output from the broadcast data demodulator 920. Parse the packet with At this time, if the packet has the set PID, the demultiplexer 930 demultiplexes the packet and delivers the packet to the broadcast data storage unit 940. Otherwise, the demultiplexer 930 does not process the packet. In this case, the demultiplexed data may be data demultiplexed into video and audio.

In addition, the controller 100 controls the broadcast data storage unit 940 to store data of the selected service channel and service channels to be buffered in corresponding buffers, respectively. At this time, the broadcast data storage unit 940 may be configured as shown in FIG. Accordingly, the controller 100 controls the first selector 320 to store data of the selected service channel and the buffered service channels output from the demultiplexer 930 in the corresponding buffers 331 to 33N, respectively, and controls the second selector 340 to select the selected service channel. The output of the buffer storing the data of the service channel is selected and transferred to the broadcast data decoder 950. In this case, the data of each service channel output from the demultiplexer 930 is data demultiplexed into video and audio data as described above. Accordingly, it is preferable that the buffers 331 to 33N store data of each service channel so as to store demultiplexed video and audio data of the corresponding service channel. Then, when data stored in the buffer of the selected service channel is output through the second selector 340, video data is output to the video decoder of the broadcast data decoder 950, and the audio data is output to the audio decoder of the broadcast data decoder 950. And each of them is played. Accordingly, the broadcast data storage unit 940 buffers data of service channels to be output when the service channel is changed and simultaneously outputs data of the selected service channel. The broadcast data decoder 950 decodes the data output from the broadcast data storage 940, and the display unit 960 and the speaker 965 output the decoded video and audio data.

 The procedure of reproducing the service channel data and changing the service channel in the digital broadcast receiver having the above configuration may be performed by the procedure of FIG. 7. Since the buffering service channel of the selected service channel is set and the data of the buffering service channel is reproduced when the service channel is changed, the method of quickly changing the service channel can be performed by the method described with reference to FIGS. 8 to 14. At this time, since it is not an IP datagram including IP information received by the digital broadcast receiver as shown in FIG. 15, the protocol processing procedure is not performed. Accordingly, except for the procedure of processing a protocol in the process of FIGS. 8 to 14, the operation of the digital broadcast receiver having the configuration as shown in FIG. 15 may be processed in the same procedure.

In addition, the portable terminal has developed into a composite terminal in which various multimedia functions are added in addition to the communication function. Recently, portable terminals equipped with the digital broadcast receiver have been developed and commercialized. 16 and 17 show the configuration of a portable terminal including the digital broadcast receiver. 16 shows the configuration of a portable terminal having a digital broadcast receiver of DVB_H type, and FIG. 17 shows a configuration of a portable terminal having a digital broadcast receiver of DVB_T or DMB type. In the following description, the configuration and operation of a portable terminal including a digital broadcast receiver will be described with reference to FIG. 16.

In the case of the portable terminal having the digital broadcast receiver, the configuration of the portable terminal of the memory 160, the key input unit 170, the display unit 150, and the speaker 155 may be used. In addition, the controller 100 may control a communication function of the mobile terminal and at the same time perform a function of controlling the operation of the digital broadcast receiver. The wireless communication unit 190 may be configured as a frequency converter for converting the received radio signal to the falling frequency conversion and the transmitted radio signal to the frequency conversion. In addition, a data processor including a modulator for modulating a transmission signal and demodulating a reception signal and a codec for encoding a transmission signal and decoding a reception signal during the wireless communication may be configured in the wireless communication unit 190. You can also configure

The portable terminal having the configuration as described above, the operation of the digital broadcast receiver in the communication mode is off, and performs the RF communication function through the wireless communication unit 190. In the broadcast mode, the communication function is turned off, and the service channel signal received through the tuner 110 is displayed in the above manner.

In addition, when an incoming call is generated in the broadcast mode, the controller 100 generates an alarm for the incoming call. In this case, the user may set the incoming alert mode, and the incoming call alert mode includes a general incoming alert and a silent incoming alert mode. When the general incoming alert is set, the controller 100 displays the incoming alert sound (melody, bell, music, etc.) set through the speaker 155, and displays the calling party subscriber information of the incoming call on the display unit 150. The silent incoming alert may be classified into a vibration alert and a display alert. When the vibration alert mode is set, when the incoming call is generated, the controller 100 drives a motor (not shown) to vibrate the mobile terminal and displays the outgoing subscriber information of the incoming call on the display unit 150. When the display alert mode is set, when the incoming call is generated, the control unit 100 displays the calling party information of the incoming call along with a message for notifying that the incoming call is generated on the display unit 150. At this time, the incoming display displayed on the display unit 150 may be displayed by blinking. In this case, the incoming call information may be overlaid on the display unit 150 while the broadcast screen of the selected service channel is displayed.

In addition, the user may generate an outgoing signal in the broadcasting mode. Since the digital broadcast receiver performs unidirectional communication, it is desirable to enable communication of necessary information through the wireless communication unit 190. For example, when watching a shopping channel through the digital broadcast receiver, it is desirable for the user to express intention to purchase while watching the broadcast. In this case, the portable terminal may establish a communication channel with the corresponding service channel through the wireless communication unit 190 according to the user's transmission request, and transmit the purchase information generated by the user. When the call mode is performed in the broadcast mode as described above, the user may perform a communication function with the service channel being viewed in real time.

As described above, when the service channel being watched on the digital broadcast receiver is changed, the display of the broadcast screen is stopped during the time when the data of the service channel to be changed is received. In order to solve the above problems, the embodiment of the present invention sets and stores the data of the service channel that is expected to change the service channel as described above, and buffers the data for the selected service channel when the service channel is changed. Play the existing data. Therefore, when the service channel is changed, the channel search can be performed quickly. In this case, the buffered service channel may be set according to a channel scan method. That is, a user of the digital broadcast receiver mainly uses a method of scanning using a channel up / down key and a method of selecting service channels that are enjoyed by using a channel number key. Therefore, the method of setting the service channels for buffering may use channel scanning efficiency using a method of buffering data of service channels adjacent to and below a selected service channel and / or a method of buffering data of service channels preferred by a user. Can improve.

As described above, the digital broadcast receiver according to the embodiment of the present invention buffers data of service channels that are frequently selected during a channel scan while watching a specific service channel, and simultaneously sets the selected service channel when the service channel is changed. By reproducing the buffered data of the service channel, the service channel change is performed in real time without waiting for the data of the selected service channel to be received. Therefore, when changing the service channel, the service channel can be changed quickly and the display of the broadcast screen can be prevented from being interrupted. In this case, when the buffered data is set to a size that can be maintained for the time when the changed service channel data is received, the broadcast screen may be displayed smoothly when scanning the channel.

Claims (38)

In the device for changing the service channel of the digital broadcast receiver, A tuner for outputting a service channel signal of a set physical channel frequency; A broadcast data demodulator for demodulating the output of the tuner, selecting and outputting at least one buffered service channel data; A broadcast data storage unit for storing the service channel data output from the broadcast data demodulator in corresponding buffers, and selectively outputting the output of a buffer for storing data of the selected service channel; A broadcast data decoder for decoding the service channel data output to the broadcast data storage unit; A display unit and a speaker for displaying the decoded data, When changing the service channel, the buffering data of the requested change service channel is selected and played back as the selected service channel data. And a service channel change control unit for reconfiguring identifiers and buffers of the buffered service channels by analyzing the changed and previous selected service channels when changing the service channel. delete The method of claim 1, wherein the broadcast data demodulator, A demodulator for demodulating the service channel signal received; An identifier of the selection and buffering service channel is set, and comprises an identifier filter for filtering and outputting service channel data of the set identifier from the demodulated service channel data; And the identifier is a program identifier (PID). delete The method of claim 3, wherein the broadcast data storage unit, Buffers for storing said selection and at least one buffered service channel data; A first selector for distributing the selection and buffering service channel data to the buffers under the control of the service channel change controller; A second selector configured to selectively output a buffer output for storing data of the selected service channel under the control of the service channel change controller; The buffering service channel may include at least one service channel among adjacent service channels which are upper service channels and lower service channels of the selected service channel, and preferred service channels having a higher selection preference than user service channels. And a service channel change device of the digital broadcast receiver. delete 6. The method of claim 5, wherein, when the service channel is changed, the service channel change control unit selects and plays data of the changed service channel, and if the changed service channel is an upper service channel of the selected service channel, the previous lower service channel identifier is used. Releasing and setting an upper service channel identifier of the changed service channel, and if the changed service channel is a lower service channel of the selected service channel, releasing a previous upper service channel identifier and setting the lower service channel identifier of the changed service channel. And a service channel change device of the digital broadcast receiver. delete The method of claim 5, wherein, when the service channel is changed, the service channel change control unit controls to select and play data of the changed service channel if the changed service channel is the preferred service channel, and if the previous selected service channel is the preferred service channel, And a service channel change device for the digital broadcast receiver, characterized in that the buffering service channel is set. delete In the device for changing the service channel of the digital broadcast receiver, A tuner for outputting a service channel signal of a set physical channel frequency; A broadcast data demodulator for demodulating the output of the tuner; A demultiplexer configured to set identifiers of a selected service channel and at least one buffering service channel and to demultiplex and output service channel data of the set identifier; A broadcast data storage unit for storing the service channel data output from the demultiplexer in corresponding buffers, and selectively outputting the output of a buffer for storing data of the selected service channel; A broadcast data decoder for decoding the service channel data output to the broadcast data storage unit; A display unit and a speaker for displaying the decoded data, When changing the service channel, the buffering data of the requested change service channel is selected and played back as the selected service channel data. And a service channel change controller configured to select buffering data of the changed service channel and output the selected service channel data when the service channel is changed, and to reset identifiers and buffers of the selection and buffering service channels. Device for changing service channel. delete 12. The apparatus of claim 11, wherein the demultiplexer examines a packet header of the received service channel data, and if the packet has the set identifier, demultiplexes the packet into video and audio packets and outputs the packet. And a service identifier of the digital broadcast receiver, wherein the identifier is a program identifier. delete The method of claim 11, wherein the broadcast data storage unit, A buffer for storing the selected service channel data and buffers for storing the at least one buffering service channel data; A first selector for distributing the selection and buffering service channel data to the buffers under the control of the service channel change controller; And a second selector configured to selectively output a buffer output for storing data of the selected service channel under the control of the service channel change control unit. The method of claim 15, wherein the buffering service channel is at least one of the service channel of the adjacent service channels of the upper service channel and the lower service channel of the selected service channel, and the preferred service channels having a high user preference preference. And a service channel change device of the digital broadcast receiver. 17. The method of claim 16, wherein, when the service channel is changed, the service channel change control unit selects and plays data of the changed service channel, and if the changed service channel is an upper service channel of the selected service channel, the previous lower service channel identifier is set. Releasing and setting an upper service channel identifier of the changed service channel, and if the changed service channel is a lower service channel of the selected service channel, releasing a previous upper service channel identifier and setting the lower service channel identifier of the changed service channel. And a service channel change device of the digital broadcast receiver. delete 17. The method of claim 16, wherein, when the service channel is changed, the service channel change control unit controls to select and play data of the changed service channel if the change service channel is the preferred service channel, and buffers the data if the previous selected service channel is the preferred service channel. And a service channel change device for the digital broadcast receiver. delete In the method of changing the service channel of the digital broadcast receiver, Setting a selected service channel and at least one buffering service channel; Analyzing a received service channel in a broadcast mode, reproducing and displaying data of the received service channel in the case of a selected service channel, and storing data of the received service channel in a buffered service channel; If a service channel change is requested in the broadcast mode, the service channel reproduces data of the change service channel requested to be changed, resets the identifiers and buffers of the buffered service channels according to the change of the service channel, and then proceeds to the broadcast mode. And a service channel changing method of the digital broadcast receiver, characterized in that the modification process is performed. 22. The method of claim 21, wherein the buffering service channels are at least one service channel among adjacent service channels having upper and lower service channel numbers of the selected service channel, and preferred service channels set by a user's selection preference. And a service channel change method of the digital broadcast receiver. The method of claim 22, wherein the service channel change process, Setting the changed service channel as a selected service channel, reproducing and displaying data of the stored received service channel; If the change service channel is an upper service channel of a previous selected service channel, releasing an identifier of a previous lower service channel, setting an identifier of an upper service channel of the changed service channel, and then proceeding to the broadcast mode; If the changed service channel is a lower service channel of the previous selected service channel, the process of releasing the identifier of the previous higher service channel, setting the identifier of the lower service channel of the changed service channel, and then proceeding to the broadcast mode. Service channel change method of the digital broadcasting receiver. The method of claim 23, wherein performing the broadcast mode comprises: Checking an identifier when receiving service channel data; If the identifier is an identifier of the selected service channel, displaying the broadcast screen for processing and displaying data of the received selected service channel; If the identifier is an identifier of an upper service channel of the selected service channel, data of the received service channel is stored in a set upper service channel buffer. If the identifier is a lower service channel identifier, data of the received service channel is stored in a set lower service channel buffer. Service channel change method of the digital broadcasting receiver, characterized in that the process of storing. delete The method of claim 22, wherein the service channel change process, If the change service channel is the preferred service channel, the change service channel is set as the selected service channel, and the data of the stored change service channel is reproduced and displayed; if the non-preferred service channel, the change service channel is set as the selected service channel. Process, After setting the selected service channel, if the previous selected service channel is a non-preferred service channel, the identifier of the service channel is released; if the preferred channel, the identifier of the service channel is maintained and the process proceeds to the broadcast mode. A method of changing a service channel of a broadcast receiver. The method of claim 26, wherein performing the broadcast mode comprises: Checking an identifier when receiving service channel data; If the identifier is an identifier of the selected service channel, processing the data of the received selected service channel and displaying the broadcast screen; And if the identifier is an identifier of the preferred service channel, storing the data of the received service channel in a corresponding corresponding service channel buffer. delete The method of claim 22, wherein the service channel change process, Setting the changed service channel as a selected service channel, reproducing and displaying data of the stored received service channel; If the changed service channel is an adjacent service channel of the previous selected service channel, it is checked whether it is an upper or lower service channel. If the changed service channel is an upper service channel of the previous selected service channel, the identifier of the previous lower service channel is released and the upper service channel of the changed service channel is released. After setting the identifier of, go to the broadcast mode, and if it is a lower service channel of the previous selected service channel, releases the identifier of the previous higher service channel, sets the identifier of the lower service channel of the changed service channel, and then returns to the broadcast mode. Process and If the change service channel is the preferred service channel, the change service channel is set as the selected service channel, and the data of the stored reception service channel is reproduced and displayed; if the non-preferred service channel, the change service channel is set as the selected service channel; After setting the selected service channel, if the previous selected service channel is a non-preferred service channel, releasing the identifier of the service channel, and maintaining the identifier of the service channel if the preferred channel is selected, proceeding to the broadcast mode. A method of changing a service channel of a digital broadcast receiver. The method of claim 22, wherein the service channel change process, Setting the changed service channel as a selected service channel, reproducing and displaying data of the stored received service channel; If the changed service channel is an adjacent service channel of the previous selected service channel, it is checked whether it is an upper or lower service channel. If the changed service channel is an upper service channel of the previous selected service channel, the identifier of the previous lower service channel is examined. Releases the channel identifier, checks the identifier of the upper service channel of the changed service channel, sets the identifier of the upper service channel if not the preferred service channel, and proceeds to the broadcasting mode; and lower service channel of the previous selected service channel. Releasing an identifier of a previous higher service channel, setting an identifier of a lower service channel of the changed service channel, and then proceeding to the broadcast mode; If the change service channel is the preferred service channel, the change service channel is set as the selected service channel, and the data of the stored reception service channel is reproduced and displayed; if the non-preferred service channel, the change service channel is set as the selected service channel; After setting the selected service channel, if the previous selected service channel is a non-preferred service channel, releasing the identifier of the service channel, and maintaining the identifier of the service channel if the preferred channel is selected, proceeding to the broadcast mode. A method of changing a service channel of a digital broadcast receiver. In a portable terminal device having a digital broadcast receiver, A wireless communication unit for processing wireless communication data, A tuner for outputting a service channel signal having a set physical channel frequency, a broadcast data demodulator for demodulating the output of the tuner, and selecting and outputting service channel data having an identifier of a selected service channel and at least one buffering service channel; A broadcast data storage unit for storing the service channel data output from the broadcast data demodulator in corresponding buffers, and selectively outputting the output of the buffer for storing the data of the selected service channel; and the service output to the broadcast data storage unit. The digital broadcast receiver comprising a broadcast data decoder for decoding channel data; In the broadcast mode, the selected service channel data is reproduced and displayed, and the data of the buffered service channels are stored in a buffer, and when the service channel is changed, the broadcast data storage unit is controlled to select and select buffering data of the changed service channel requested to be changed. A control unit for outputting channel data and processing a call generated in the broadcasting mode through the wireless communication unit; A display unit and a speaker for displaying data of the decoded service channel and data processed in a communication mode, When the service channel is changed, the control unit controls the broadcast data storage unit to select buffering data of the changed service channel and output the selected service channel data, and sets reset identifiers of the selection and buffering service channels to the broadcast data demodulator. And at the same time resetting the buffers of the broadcast data storage unit. delete 32. The method of claim 31, wherein the control unit displays an incoming alert including incoming subscriber information on the display unit when an incoming call occurs in the broadcast mode. And a digital broadcasting receiver for transmitting outgoing data through the wireless communication unit when an outgoing signal is generated in the broadcasting mode. delete In a portable terminal device having a digital broadcast receiver, A wireless communication unit for processing wireless communication data, A tuner for outputting a service channel signal of a set physical channel frequency, a broadcast data demodulator for demodulating the output of the tuner, identifiers of a selected service channel and at least one buffered service channel are set, and service channel data of the set identifier A demultiplexer for demultiplexing and outputting the demultiplexer, a broadcast data storage unit for storing the service channel data output from the demultiplexer in corresponding buffers, and selectively outputting the output of a buffer for storing the data of the selected service channel; The digital broadcast receiver comprising a broadcast data decoder for decoding service channel data output to the broadcast data storage unit; In the broadcast mode, the selected service channel data is reproduced and displayed, and the data of the buffered service channels are stored in a buffer, and when the service channel is changed, the broadcast data storage unit is controlled to select and select buffering data of the changed service channel requested to be changed. A control unit for outputting channel data and processing a call generated in the broadcasting mode through the wireless communication unit; A display unit and a speaker for displaying data of the decoded service channel and data processed in a communication mode, When the service channel is changed, the control unit controls the broadcast data storage unit to select buffering data of the changed service channel and outputs the selected service channel data, and sets reset identifiers of the selection and buffering service channels in the demultiplexer. And at the same time resetting the buffers of the broadcast data storage unit. delete 36. The apparatus of claim 35, wherein the controller displays an incoming alert including called subscriber information on the display unit when an incoming call occurs in the broadcast mode. And a digital broadcasting receiver for transmitting outgoing data through the wireless communication unit when an outgoing signal is generated in the broadcasting mode. delete

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