KR20070118812A - Device and method for scanning channel of digital broadcasting receiver with multi-frequency channel - Google Patents

Abstract

An apparatus and a method for changing a service channel in a DMB receiver using a multi-frequency channel are provided to buffer a signal of at least one service channel adjacent to a present channel in view and to display the buffered signal when a channel is changed. An apparatus for changing a service channel includes at least two broadcasting receiving and storing units(111), a selector(120), a broadcasting data decoder(140), a display(150) and a speaker(155). The broadcasting receiving and storing unit includes a tuner, a broadcasting demodulator, and broadcasting data storage units. The selector extracts data of a selected service channel from the output of the broadcasting receiving and storing units. The broadcasting data decoder decodes service channel data output from the selector. The display and the speaker express the decoded data. Buffering data of the changed service channel are selected and reproduced as selection service channel data. When a service channel is changed, buffering data of the changed service channel are selected and reproduced as selection service channel data, and a buffering channel is reset in the broadcasting receiving and storing unit having a service channel selected before the change of the service channel.

Description

Device and method for changing service channel of digital broadcasting receiver using multiple frequency channels {DEVICE AND METHOD FOR SCANNING CHANNEL OF DIGITAL BROADCASTING RECEIVER WITH MULTI-FREQUENCY CHANNEL}

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

FIG. 2 is a diagram illustrating a configuration of a broadcast receiving and storing unit of FIG. 1.

FIG. 3 is a diagram showing the configuration of the broadcast data demodulator of FIG.

4 is a diagram illustrating a configuration of a broadcast data storage unit of FIG. 2.

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

6 is a diagram illustrating a data structure of a service channel received at a digital broadcast receiver.

FIG. 7A is a diagram illustrating a configuration example of service channel data using a time slicing scheme, and FIGS. 7B to 7D are diagrams for describing a buffering method of an adjacent service channel according to an embodiment of the present invention. 7E is a diagram illustrating a buffering method of a preferred service channel according to an embodiment of the present invention.

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

9 is a flowchart illustrating a procedure of setting buffering service channels in FIG. 8.

10 is a flowchart illustrating a processing procedure of a broadcast mode in FIG. 8.

11A-11C are flowcharts illustrating a procedure for storing broadcast channel data in FIG. 10.

FIG. 12 is a flowchart illustrating a processing procedure of a service channel change mode in FIG. 8.

13A-13C are flowcharts illustrating a procedure for resetting a buffering service channel in FIG. 12.

14 illustrates another configuration of a digital broadcast receiver for serving multiple frequency channels according to an embodiment of the present invention.

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

The present invention relates to an apparatus and method for controlling a service channel of a digital broadcast receiver, and more particularly, to an apparatus and method for controlling a service channel of a digital broadcast receiver using multiple frequency channels.

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 DVB_H digital broadcast receivers, bursts are generally generated 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, thereby increasing the service channel change time. 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 serving multiple frequency channels.

Another object of the present invention is to buffer at least one service channel signal adjacent to a channel currently being viewed in a digital broadcasting receiver serving multiple frequency channels, and to display a signal of the buffered service channel when the channel is changed. An apparatus and method for reducing the change time are provided.

Another object of the present invention is to buffer at least one service channel signal having a high user preference and a channel currently being viewed in a digital broadcasting receiver serving multiple frequency channels, and displaying a signal of the buffered service channel when the channel is changed. The present invention provides an apparatus and method for reducing a change time of a service channel.

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 the currently selected service channel in a mobile terminal having a digital broadcast receiver serving multiple frequency channels. The present invention provides an apparatus and method for reducing a service channel change time by displaying a signal of the buffered service channel when a change is made.

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 serving multiple frequency channels, and changing a service channel. The present invention provides an apparatus and method for reducing a service channel change time by displaying a signal of the buffered service channel.

Apparatus for changing the service channel of the digital broadcast receiver according to an embodiment of the present invention for achieving the above object; 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, selecting and outputting at least one buffered service channel data, and a service channel output from the broadcast data demodulator At least two broadcast receiving and storing units respectively storing data in corresponding buffers and having broadcast data storage units for selectively outputting an output of a buffer for storing data of the selected service channel; A selector for selecting data of a selected service channel at an output of the parts; A broadcast data decoder for decoding the service channel data output from the selector; A display portion and a speaker for displaying the decoded data; When the service channel is changed, the buffering data of the changed service channel is selected and reproduced as the selected service channel data, and the buffering channel to the broadcast reception and storage unit to which the change and the previous selected service channel belong is reset.

In addition, 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; 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 and 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. At least two broadcast receiving and storing units; A selector for selecting data of a selected service channel at an output of the broadcast reception and storage units; A broadcast data decoder for decoding the service channel data output from the selector; A display portion and a speaker for displaying the decoded data; When the service channel is changed, the buffering data of the changed service channel is selected and reproduced as the selected service channel data, and the buffering channel to the broadcast reception and storage unit to which the change and the previous selected service channel belong is reset.

In addition, according to an embodiment of the present invention for achieving the above object, a method of changing a service channel of a digital broadcast receiver having at least two physical channels includes: setting a selected service channel and at least one buffering service channel identifier; In the mode, the service channel received through each of the physical channels is analyzed, and if the selected service channel, the data of the received service channel is reproduced and displayed. Storing in the channel buffer and, when the service channel change is requested in the broadcast mode, selecting and playing an output of the buffer storing the changed service channel data; and buffering service of the physical channel of the change and previous selected service channel. After resetting the channels, proceed to the broadcast mode. It characterized by a switch constituted by any channel change process.

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, 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 A detailed description of preferred embodiments of the present invention will now be described with reference to the accompanying drawings. It should be noted that the same components in the figures represent the same numerals wherever 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 one of ordinary skill in the art that the present invention may be readily practiced without these specific details and also by their modifications.

Embodiments of the present invention relate to a digital broadcast receiver or a portable terminal having such a digital broadcast receiver for buffering a signal of a service channel selected by a user and at least one other service channel signal in preparation for a change of the service channel 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 identifier (ID) as a channel of an actual broadcasting station transmitted on the selected channel. (event) means 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. In addition, the term multi-frequency channel means that the digital broadcast receiver includes a plurality of physical channels. Embodiments of the present invention relate to an apparatus and a method for controlling a service channel change of service channels serviced to each physical channel in a digital broadcast receiver serving a broadcast of multiple frequency channels (plural physical channels).

In addition, the terms of each service channel used in the following description are defined as follows. The term multi-frequency channel refers to at least two physical channels set in the digital broadcast receiver. The term selection service channel refers to a service channel selected by a user and displaying broadcast data on a display unit. The term change service channel refers to 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 while the change service channel is 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 upper service channel means a service channel having a channel number higher than the selected service channel as an adjacent service channel, and the term lower service channel means a service channel having a channel number lower than the selected service channel as an adjacent service channel. do. The term "preferred service channel" refers to service channels having a high user preference, and refers to a service channel set as a buffering service channel by a user's setting or a digital broadcast receiver. The term buffering service channel refers to a service channel stored in a buffer while performing a broadcast mode.

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 other service channel data in addition to the service channel being watched while watching a broadcast, and if the service channel to be changed is the service channel being stored when the service channel change request is made, storing the service channel data. It performs a function of the service channel change control unit for changing the service channel while playing the data of the service channel. 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 broadcast receiving and storing units 111-11N are set to set physical channel frequencies, respectively, and demodulate service channel signals transmitted through the set physical channel, and select data of a selected service channel and a buffered service channel from the demodulated service channel data. Save it. In this case, the selected service channel may be a service channel of a specific physical channel. The selector 120 selects data of the selected service channel from the outputs of the first broadcast reception and storage section 111-N broadcast reception and storage section 11N. 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.

2 is a diagram showing the configuration of the broadcast receiving and storing section 111-11N.

Referring to FIG. 2, the broadcast receiver 200 of each physical channel includes a tuner 270 and a broadcast data decoder 290. The tuner 270 is set to each set physical channel frequency under the control of the controller 100 and receives broadcast signals of each set physical channel. The broadcast data demodulator 290 demodulates the broadcast signal of the physical channel output from the tuner 270. In this case, the broadcast data demodulator 290 demodulates and outputs a plurality of service channel signals included in a physical channel. The broadcast data storage unit 300 controls data of a service channel selected from among data of a service channel output from the broadcast data demodulator 290 and at least one other service channel (ie, a buffered service channel) under the control of the controller 100. ) Buffers the data.

1 and 2, the broadcast data demodulator 290 and the broadcast data decoder 140 may be configured in different forms according to the digital broadcasting 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 the MPEG2_TS structure in the DMB and DVB_T digital broadcast receivers is filled with broadcast data, and the payload of each packet having the MPEG2-TS structure in the DVB_H digital broadcast receiver is IP information and It is filled with broadcast data. Accordingly, in the DVB_T and DMB schemes, the broadcast data demodulator 290 may be configured as a demodulator for demodulating service channel data, and the broadcast data decoder 140 includes a demultiplexer, a video and audio decoder for decoding a signal of a selected service channel. Has a configuration. However, in the DVB_H scheme, the broadcast data demodulator 290 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 270. The broadcast data decoder 140 may include a protocol processor for processing a protocol including IP information, a video and audio decoder, and the like.

A digital broadcast receiver according to an embodiment of the present invention uses a multi-frequency channel to set a plurality of physical channels, and stores all service channel data of each physical channel according to a set principle. When the service channel is changed, the stored data of the changed service channel is selected and reproduced, and the buffering service channels are reset to the physical channels of the changed and previously selected service channel.

The digital broadcast receiver according to the embodiment of the present invention buffers a signal of a service channel to which a service channel is expected to change, such as adjacent channels of a selected service channel or service channels having a high user's selection preference in each physical channel. When the service channel is changed, the service channel change time of the digital broadcast receiver can be reduced by reproducing the buffered data. In the embodiment of the present invention, in order to reduce the service channel change time when the service channel is changed, buffering data of the service channel to be changed, and processing the buffered service channel data when changing the service channel, thereby changing the service channel change time. At the same time, it is possible to continuously display the broadcast signal when changing the service channel.

In this case, the digital broadcast receiver may service broadcast data of a plurality of physical channels as shown in FIG. 1, and thus includes at least two broadcast receivers and storage units. Accordingly, the digital broadcast receiver may receive service channel data of two or more physical channels. In this case, one physical channel may receive signals of the service channel and the buffering service channel selected by the user, and the other physical channel may receive the signal of the buffering service channel. In this case, when a specific service channel is selected by the user, the controller 100 checks whether a physical channel capable of receiving the selected service channel is set, and if so, sets the selected service channel in the corresponding physical channel. However, when a physical channel capable of receiving the selected service channel is not set, the controller 100 sets a physical channel frequency for receiving the selected service channel in one broadcast receiving and storing unit among the broadcast receiving and storing units. The other broadcast receiving and storing unit controls to receive data of the buffering service channel. The physical channel receiving the data of the buffering service channel may be set to the physical channel frequency to which the service channel with the highest frequency of change (that is, the service channel most selected by the user) belongs, or the physical channel frequency may be set in a set manner. have.

In addition, if the broadcast receiving and storing unit 111-11N can receive signals of all service channels that can be serviced by the digital broadcast receiver, the control unit 100 receives and stores a broadcast channel having a set physical channel frequency capable of receiving a selected service channel. The selected service channel can be set by confirming a part.

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. The latter method uses a numeric key and / or set service channels by using a shortcut key (or channel up / down key). Can 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 data of adjacent service channels and a method of buffering data 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. 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 290 demodulates service channel signals including the currently selected service channel, and the broadcast data storage unit 300 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 300 and reproduces the signal through the display unit 150 and the speaker 155. In this case, the broadcast data storage unit 300 buffers adjacent service channel signals of the currently selected service channel. The size of the broadcast data storage unit 300 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 a channel selection signal through the key input unit 170, the controller 100 detects this and selects the buffered broadcast signal corresponding to the service channel selected by the broadcast data storage unit 300 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 and controls the broadcast data demodulator 290 and the broadcast data storage unit 300 to change the number of the selected service channel and the adjacent service channel to prepare for the next service channel change.

The method of changing a service channel as described above may be used even when a user searches for memory channel numbers sequentially stored using a channel up / down key after storing service channels desired by a user. 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 300 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 290 demodulates service channel signals including the currently selected service channel, and the broadcast data storage unit 300 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 300 and reproduces the signal through the display unit 150 and the speaker 155. In this case, the broadcast data storage unit 300 buffers adjacent service channel signals of the currently selected service channel. Here, the size of the broadcast data storage 300 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 300. In this case, if the selected service channel is a buffered service channel, the controller 100 selects the buffered broadcast signal corresponding to the service channel selected by the broadcast data storage unit 300 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 control unit 100 determines a service channel to buffer by analyzing user preferences after changing the service channel, and then controls the broadcast data demodulator 290 and the broadcast data storage unit 300 to change the number of the selected service channel and the determined service channel. Prepare for service channel changes.

As described above, in the embodiment of the present invention, a digital broadcast receiver using the plurality of physical channels (that is, using a plurality of tuners) reproduces a signal of a locally selected service channel, and also buffers each of the physical channels. Save channel data. When changing the service channel, the change service channel is set as the selected service channel, and the physical channel of the changed service channel is checked, and the broadcast data received and stored in the checked physical channel is reproduced. Accordingly, by receiving the service channel data of the next burst data while reproducing the stored service channel data, it is possible to quickly change the service channel.

Using the same method of changing a service channel as in the embodiment of the present invention, when the user selects another service channel (service channel of the same physical channel or different physical channel) while watching an arbitrary service channel, the changed service channel is buffered. If the service channel, the buffering data of the corresponding service channel is reproduced. Therefore, in the exemplary embodiment of the present invention, the service channel is changed by buffering a signal of the service channel to which the service channel is expected to be changed among the service channels, and when the changed service channel is the buffered service channel, displaying the buffered service channel signal. You can save a lot of time.

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.

3 illustrates a configuration of the broadcast receiver 200 of the DVB_H method. As shown in FIG. 2, the broadcast receiver 200 includes a tuner 270 and a broadcast data demodulator 290. Each of the broadcast receiver and storage 111-11N of FIG. 1 includes the broadcast receiver 200, respectively.

In addition, the DVB_H data configuration has the configuration as shown in Figs. 6A to 6F.

First, referring to the DVB_H data mapping configuration of FIGS. 6A to 6F, the DVB_H data has an MPEG2-TS structure. In FIG. 6A, 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. 6B illustrates a configuration of an MPE section that can be carried in the payload of FIG. 6A, 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. Fig. 6C 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. FIG. 6D is UDP information and includes port addresses (Scr Prt, Dst Prt) of the calling and called party. 6E is a configuration of FLUTE / ARC, and includes an ESG (Electronic Sevice Guide), files, and the like. 6F is an RTP configuration, in which audio and video data are included.

Referring to FIG. 3, a tuner 270 is connected to a front end of the broadcast data demodulator 290. Tuner 270 is a PLL for generating a frequency for setting a physical channel, a mixer for outputting a broadcast signal of a set physical channel by mixing the received broadcast signal and the physical channel frequency generated in the PLL, and the set of the 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. Accordingly, the tuner 270 of the broadcast reception and storage 111-11N is set to different physical channel frequencies, and thus the broadcast reception and storage 111-11N is set by the tuner 279 among service channel signals of multiple frequency channels. The service channel signals of the corresponding physical channels are received.

The A / D converter 210 of the broadcast data demodulator 290 receiving the output of the tuner 270 converts the output signal of the tuner 270 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. 6A, and the TS packet includes PID information which 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. 6B. Then, if the TS packet is data including the information as shown in FIG. 6B, 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. 6B. 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 the selection and / or buffering service channel. Power is supplied to the tuner 100 and the demodulator 220 in the data section, and the power supply is stopped in the other sections. In addition, the demodulation controller 240 performs the MPE-FEC function on the data of the selection and buffering service channels output from the PID filter 230 using the MPE section information as shown in FIG. 6B.

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. 6C.

Accordingly, the tuner 270 selects the broadcast signals of the physical channel of the set service channel, and the broadcast data demodulator 290 converts the output of the tuner 270 into digital data and demodulates (OFDM or COFDM). In this case, the demodulated data has an MPEG2 TS structure and includes PID information for distinguishing service channels of the corresponding physical channel. Accordingly, the PID filter 230 analyzes the PID of the demodulated data to filter the demodulated data having the PID of the selection and / or buffering service channel. The demodulation controller 240 then performs error correction on the PID filtered service channel data.

Accordingly, the broadcast data demodulator 290 transmits an IP datagram having a structure as shown in FIG. 6C to the broadcast data storage 300, and the broadcast data storage 300 sets data of a 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. 6C output from the broadcast data storage unit 300, and then extracts and decodes the video and audio data.

4 is a diagram illustrating a configuration of a broadcast data storage unit 300 according to an embodiment of the present invention.

Referring to FIG. 4, the broadcast data storage unit 300 buffers data of a service channel selected by a user and data of a buffered service channel used for changing a service channel among data of a service channel output from the broadcast data demodulator 290. 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 selected service channel and the service channel to be buffered to corresponding buffers, respectively. The first selector 320 selects the data of the service channel output from the broadcast data demodulator 290 under the control of the controller 100 and transfers the data to the corresponding buffers. The second selector 340 selects the service channel data under the control of the controller 100. Select a broadcast signal output from the buffer for storing the function to deliver 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 300 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 290, 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 300 having the above configuration, the controller 100 knows the PID of the service channel currently received, and allocates the buffers 331-33N to store the 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, the controller 100 buffers signals of a currently selected service channel output from the broadcast data demodulator 290 and service channels adjacent to the selected service channel, respectively. The first selector 320 is controlled to apply to 33N. 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 includes 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 controller 100 sets the number of channels to be buffered and channel numbers having a high user preference, and then the broadcast data demodulator 290 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. In this case, the broadcast data storage unit 130 shown in FIG. 4 is provided in each of the broadcast reception and storage units 111-11N, and stores data of selection and / or buffering service channels set in the corresponding physical channel. In this case, the data buffered in the physical channel may be data of a selection and buffering service channel or data of a buffering service channel. Accordingly, the selection and / or buffering service channel means a selection and buffering service channel or a buffering service channel.

When the service channel is changed in the above state, the controller 100 controls the second selector 340 to check the physical channel of the changed service channel, and then the broadcast data storage unit 300 of the broadcast reception and storage unit of the corresponding physical channel. Buffers the data of the change service channel and controls the output of the buffers 331-33N to store the change service channel data to the broadcast data decoder 140.

When the service channel is changed, the controller 100 resets the buffered service channels of the service channels received through the physical channels of the changed service channel and the previous selected service channel. In this case, the buffering service channel may be an adjacent service channel and / or a preferred service channel. Thereafter, the control unit 100 sets the PIDs of the reset buffering service channels to the broadcast data demodulator 290 (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 300 is controlled so that the data of the reset buffering service channel can be stored in a corresponding buffer. The resetting of the buffering service channel depends on which physical channel the change service channel is using. That is, if the change service channel is a service channel of the same physical channel, the resetting of the buffering service channel is performed only in the corresponding physical channel. If the change service channel is a service channel of another physical channel, the physical channel to which the change service channel belongs and the previous selected service channel belong to it. The resetting operation of the buffering service channel is performed on the physical channel.

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.

Looking at the configuration of the protocol processor 410, the data of the selected service channel input to the IP decapsule module 411 is the IP information (source IP address, desination) of the sender and the receiver as shown in Figure 6c IP datagram containing the 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. 6D. 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. 6E, the received data is transmitted to a FLUTE file module 415. transport (RTP / TRCP) module) 417. In this case, in 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 controller 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.

7A to 7E 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. 7A is a diagram illustrating an example of receiving service channel data using a time slicing scheme. FIG. 7A 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, the section in which the CH3 data is received is called a burst time, and the remaining sections CH4-CH6 and CH1-CH2 are called 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 received for 1 second every 6 seconds. do. 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), so that the demodulation controller 240 can determine the burst time of the selected service channel. 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.

7B-7D 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. 7A, 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, it is impossible to change the service channel until the data of the service channel to be changed is acquired in the next burst data section. As a result, the service channel change time is prolonged and the screen display is disconnected. Therefore, in order to reduce the waiting time before the next burst appears when the service channel is changed, the signal of the service channel to which the service channel is expected to be changed in advance is received and buffered, and when the service channel is changed, the signal of the buffered service channel is processed and reproduced. By receiving and processing the service channel of the next burst during this time, 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. 7B, adjacent service channel signals of the currently viewed service channel are received in advance and stored in the broadcast data storage 300. That is, assuming that the service channel CH3 is selected as shown in FIG. 7B, adjacent service channels CH2 and / or CH4 are received and 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 300 should have buffers 331 to 33N 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. 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. 7C. When the adjacent service channel signals are buffered as described above, power must be supplied in the reception interval of the service channel and the adjacent service channel selected by the user as shown in FIG. 7D.

7E 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 300. FIG. 7E is a diagram illustrating an example of buffering service channels CH2 and CH6 while watching service channel CH4, and illustrates an example of CH2 and CH6 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. 7B to 7D will be described.

8 is a flowchart illustrating a service channel change procedure of a digital broadcast receiver serving a multiple frequency channel according to an embodiment of the present invention in a digital broadcast receiver.

Referring to FIG. 8, when the user selects a service channel through the key input unit 170, the control unit 100 sets a physical channel frequency capable of receiving the service channel selected by the user in step 510 and the selection service in step 520. The PID of the channel is set, and the buffering service channels set in the respective physical channels are set in step 530. That is, when the controller 100 selects a service channel to be viewed by the user with reference to the SDT of the PSI / SI and / or ESG data, the controller 100 determines whether a physical channel capable of receiving the service channel is set. Check it. In this case, when the physical channel frequency is set, the controller 100 sets the PID of the selected service channel to the broadcast reception and data storage unit in which the corresponding physical channel frequency is set, and stores the data of the selected service channel. It also sets the output path of the buffer for storing the data of the selected service channel. Then, the selector 120 is controlled to select service channel data output from the broadcast reception and storage unit of the selected service channel to be delivered to the broadcast data decoder 140. However, when a physical channel capable of receiving data of the selected service channel is not set, the controller 100 receives data of the selected service channel from a specific broadcast receiver and storage unit among the broadcast receiver and storage units 111-11N. The physical channel frequency and the PID of the selected service channel can be set. As described above, a buffer for storing data of the selected service channel is set, and an output path for service channel data stored in the buffer is set.

The controller 100 sets PIDs and buffers of a buffered service channel in the broadcast reception and storage 111-11N according to the selected service channel. In this case, the controller 100 sets the buffering service channels in step 530 of FIG. 8, and the setting of the buffering service channel is performed in the same manner as in FIG. 9. The service channels to be buffered may be adjacent service channels of the selected service channel and / or service channels with 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.

Referring to FIG. 9, the controller 100 checks the physical channel frequency of the selected service channel in step 591, and sets buffering service channels of the respective physical channels while performing steps 593 to 599. That is, the control unit 100 sets buffering service channels to the physical channel of the selected service channel while performing steps 593 to 595 for the physical channel of the selected service channel, and performs steps 597-599 for the physical channel of the selected service channel. While setting the service channels of the corresponding physical 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 and the PIDs of the buffering service channel set by the user in the PID filter 230.

When the service channel playback mode is requested as described above, the control unit 100 sets the buffering service channels of the respective physical channels while performing steps 510 to 530 of FIG. 8, and then proceeds to step 540 to perform the broadcast playback mode. do. When the broadcast play mode is performed, the broadcast data demodulator 290 converts the output of the tuner 270 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 processed and stored in the broadcast data storage unit 300. 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. 6C 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 control unit 100 in the allocated buffers. In addition, the broadcast data storage unit 130 outputs the data of the selected service channel to the broadcast data decoder 140 under the control of the controller 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. 10 is a flowchart illustrating an operation procedure of a broadcast play mode in which a service of a selected service channel is reproduced and a signal of an adjacent channel of a selected service channel is buffered in step 540 of FIG. 8.

Referring to FIG. 10, when broadcast data is received, the control unit 100 detects this in step 601 and classifies and buffers selected service channel and / or buffered service channel data for each physical channel. In this case, the physical channel including the selection service channel receives data of selection and buffering service channels, and the physical channel not including the selection service channel receives only data of buffering service channels. Accordingly, the control unit 100 detects this in step 603 of the broadcast data received on the physical channel of the selected service channel and stores the data of the selected and buffered service channels in steps 605 through 617, and does not include the selected service channel. In the case of a channel, the buffering service channel data of the corresponding physical channel is stored while performing steps 619 to 621.

Referring to the processing procedure of the broadcast data received on the physical channel of the selected service channel, the controller 100 checks whether the received service channel PID is the PID of the selected service channel in step 605. In this case, if the PID of the service channel selected in step 605 is extracted, audio and video data are extracted after extracting the protocol of the IP datagram in steps 607 and 609, and after decoding the audio and video data in step 611, 613. In the step, the decoded video and audio data are reproduced through the display unit 150 and the speaker 155. That is, when 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 from the data of the demodulated service channel, and extracts the extracted audio and video data, respectively. Decode and play.

However, if the received data of the service channel is not the PID of the selected service channel in step 605 and step 613, the controller 100 checks whether the data of the service channel received in step 615 is the PID of the service channel to be buffered. In this case, the buffering service channel is set in step 530 of FIG. 8 and is reset in the service channel change mode of step 550. The buffering service channel may be an adjacent service channel of the selected service channel or preferred service channels of the user. If the PID of the reception service channel is the PID of the buffering service channel, the controller 100 stores the received data in a buffer of the corresponding buffering service channel in step 617.

In addition, if the received broadcast data is not received as a physical channel of the selected service channel, the controller 100 detects it in step 603 and checks whether the PID of the received broadcast data is the PID of the buffered service channel in step 619. If the received PID is the PID of the buffering service channel, the control unit 100 detects it in step 619 and stores the received broadcast data in the buffer of the corresponding service channel in step 621.

If a service channel change occurs while reproducing the data of the selected service channel as described above, the controller 100 detects it in step 623 and proceeds to step 550 of FIG. 8 to perform a procedure of 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.

The PID to be buffered may be a PID of an adjacent service channel of the selected service channel, or a PID of a service channel preferred by the user. In this case, the adjacent service channel refers to an upper and / or lower service channel of the selected service channel. Accordingly, the physical channel for setting the adjacent service channels as the buffering service channel may be a physical channel in which the selected service channel exists. However, in order to set adjacent service channels as buffering service channels even to physical channels to which the selected service channel does not belong, in the embodiment of the present invention, the adjacent service channels of the previous selected service channel and the previous selected service channel are buffered service channels. Set to. In addition, the preferred service channel means a service channel having a high user preference. That is, viewers prefer to select service channels of a specific genre according to personal characteristics. That is, a sports-loving viewer may prefer to select sports service channels, while a user who likes drama or a movie may prefer to select drama and / or movie service channels. Accordingly, the preferred service channels may be set as buffering service channels by a user (or a controller of the digital broadcast receiver). In the following description, an operation procedure when the adjacent service channel is set as the buffering service channel will be described first, and then an operation procedure when the preferred service channel is set as the buffering service channel will be described.

FIG. 11A is a flowchart illustrating a buffering operation procedure of adjacent service channels in a physical channel including a selected service channel, FIG. 11B is a flowchart illustrating a buffering operation procedure of preferred service channels, and FIG. 11C includes a selection service channel. A flowchart illustrating a buffering operation procedure of adjacent service channels in a physical channel that is not present.

Referring to FIG. 11A, when the buffering service channel is an adjacent service channel in step 617, the controller 100 detects this and checks whether the received PID is the PID of the higher service channel in step 641. 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 the set buffer of the broadcast data storage 300 in step 643, and the lower service channel. In step 645, the IP datagram of the service channel having the lower service channel PID is stored in the set buffer of the broadcast data storage unit 300. That is, when the currently selected service channel is CH3 as shown in FIG. 7B, if the received PID is the PID of CH4, the control unit 100 detects it in step 641 and controls the broadcast data storage unit 300 to control the service channel of the received CH4. Buffer the data. If the received PID is the PID of CH2, the control unit 100 detects this in step 641 and controls the broadcast data storage unit 300 in step 645 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, ---).

Secondly, referring to FIG. 11B, when the buffering service channel is the preferred service channel in step 617, the controller 100 detects this and stores data of the corresponding preferred service channel while performing steps 651 to 657. For this purpose, a buffer determined to be stored (a buffer configured to store data of a corresponding preferred service channel among buffers 331 to 33N) is identified and stored in the identified buffer, respectively. For example, as shown in FIG. 7E, when CH4 is a selected service channel and CH2 and CH6 are set as preferred service channels, the controller 100 plays the CH4 service channel data when service channel data having a PID of CH4 is received. When the service channel data having the PID of CH2 or CH6 is received, the controller 100 buffers the data of the preferred service channel in the set buffer while performing steps 651 to 653 or 655 to 657.

Third, when the adjacent service channel is used as a buffering service channel, there may exist physical channels that do not include the selected service channel. In this case, the adjacent service channels cannot be used as a buffering service channel in a physical channel that does not include the selected service channel. Therefore, in the embodiment of the present invention, when the adjacent service channels are set as the buffering service channel in the physical channel that does not include the selected service channel, the service channel, which was the selected broadcast service channel in the previous state, is set as the buffering service channel. It is assumed that adjacent service channels of the channel are set as the buffering service channel. Accordingly, referring to FIG. 11C, if the PID of the reception service channel is the PID of the previous selection service channel in step 661, the controller 100 detects this in step 661, and buffers the PID and the buffer of the previous selection service channel in step 663. Set to channel. In step 665 to step 669, adjacent service channels of the previously selected service channel are set as a buffering service channel.

Fourth, the adjacent service channel and the preferred service channel may be combined and set as a buffering service channel. In this case, the control unit 100 stores the data of the buffering service channel (in this case, the adjacent and preferred service channels) set in the set buffer while performing the procedure of FIGS. 11A to 11C.

Accordingly, the controller 100 buffers the data of the adjacent service channel and / or preferred service channels while playing the broadcast data of the selected service channel. Data of the buffered service channels may be used when a service channel is changed.

In step 540, the control unit 100 reproduces the signal of the service channel selected by the user as shown in FIG. 10 and simultaneously buffers the data of the set buffering service channels. 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.

12 is a flowchart illustrating a procedure for changing and buffering service channels when changing a service channel according to an embodiment of the present invention.

12, in step 701, 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 plays 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. Therefore, the stored data of the changed service channel is reproduced to quickly change the service channel, and the data of the changed service channel received at the next burst time are stored as data of the selected service channel.

In step 703, the controller 100 checks whether the changed service channel is the same physical channel as the previous selected service channel. In this case, if the change service channel and the previous selection service channel are the same physical channel, only the buffering service channels of the physical channel of the change service channel need to be reset. The buffering service channels of the physical channel of the channel must be reset. Therefore, if the same physical channel, the control unit 100 detects this in step 703, and in step 705 resets the buffering service channels of the corresponding physical channel. However, if the change and previous selection service channels are different physical channels, the control unit 100 detects this in step 703, resets the buffering service channels of the physical channel to which the change service channel belongs in step 707, and in step 709 Reset the buffering service channels of the physical channel to which the channel belongs.

Here, the buffering service channel may be adjacent service channel and / or preferred service channel as described above.

In this case, in the case of the adjacent service channel, the controller 100 sets the adjacent service channels as the buffering service channel while performing the procedure of FIG. 13A in steps 705 and 707 of FIG. 12.

Referring to FIG. 13A, when the adjacent service channel is set as the buffering service channel, the controller 100 checks whether the changed service channel is an upper service channel of the previous selected service channel in step 731. In this case, the controller 100 detects this in step 731, deletes the previous lower service channel PID in step 733, and stores a buffer for storing the upper service channel PID and broadcast data of the changed service channel in step 735. Set it. That is, if the changed service channel is a higher service channel than the previously played service channel, the controller 100 sets the changed service channel as the selected service channel in steps 733 and 735 and 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 731, releases the previous upper channel PID in step 737, and lower service of the changed service channel in step 739. 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 while performing steps 737 and 739 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 reproducing the data of CH3 and buffering the data of CH2 and CH4 as shown in FIG. 7B, the controller 100 detects that the changed service channel is an upper service channel in step 731. In step 733 and step 735, the PID of the lower service channel CH2 buffered is released, and the PID of the upper service channel CH5 is set as the buffering PID. 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. 7B, the controller 100 detects that the changed service channel is a lower service channel in step 731, and step 737. In step 739, the PID of the upper service channel CH4 buffered is released, and the PID of the lower service channel CH1 is set as the buffering PID.

If the PID of the upper and / or lower service channel adjacent to the changed service channel is set as the buffering PID, the broadcast data demodulator 120 selects and buffers the PIDs of the changed service channel and the reset buffering 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 data of the changed service channel being stored during the change of the service channel (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.

In addition, if the change service channel is a different physical channel from the previous selected service channel in the state of setting the adjacent service channel as the buffering service channel, the control unit 100 detects this in step 703 and the change service as shown in FIG. 13A in step 707. The buffering service channels of the physical channel to which the channel belongs are reset, and in step 709, the buffering service channel of the physical channel to which the previous selected service channel belongs is set as shown in FIG. 13B.

Referring to FIG. 13B, in order to set the buffering service channel of the physical channel to which the previous selected service channel belongs, the control unit 100 prevents the output of the previous selected service channel from being selected in step 741, and sets the PID and the buffer of the service channel. Keep the state as it is. In operation 743, the buffering setting state of the service channels adjacent to the previous selected service channel is maintained as it is. Accordingly, when the above operation is performed, the buffering service channels of the physical channel to which the previous selection service channel belongs are maintained, while the previous selection service channel is also set as the buffering service channel. However, the neighbor service channel is for using the neighbor service channel of the currently selected service channel as described above as a buffering service channel. Therefore, when a buffering service channel is set, a method of setting the adjacent service channel as a buffering service channel may not be used in a physical channel to which the selected service channel does not belong.

In addition, an operation procedure when using the preferred service channel as a buffering service channel will be described. 13C is a flowchart illustrating an operation procedure when using a preferred service channel as a buffering service channel according to an embodiment of the present invention. The operating procedure as shown in FIG. 13C may be performed in steps 705, 707, and 709. In step 709, the changed service channel may be the previous selected service channel.

Referring to FIG. 13C, if the change service channel is the preferred service channel, the control unit 100 detects it in step 751, sets the change service channel as the selection service channel in steps 753 and 755, and determines the selection service channel. Select and play back the data stored in the buffer. That is, the output of the changed service channel is set as the selected service channel, and the data stored in the buffer of the changed service channel is selected and output to the broadcast data decoder 140. Therefore, when the service channel is changed, the data stored in the buffer of the corresponding service channel is reproduced and displayed while the data of the changed service channel is received. Therefore, when the service channel is changed, the data of the changed service channel can be displayed immediately.

In step 761, the control unit 100 checks whether the previous service channel is the preferred service channel. If the preferred service channel is set, the controller 100 sets the previous service channel as the buffered service channel in step 763. Release from the buffering service channel. That is, after setting the PID and the buffer of the changed service channel as the selected service channel, the controller 100 checks the previously selected service channel and sets the buffered service channel if it is the preferred service channel, and if not the preferred service channel, the corresponding service channel. Release the PID.

However, if the change service channel is not the preferred service channel in step 751, the controller 100 sets the change service channel as the selected service channel in step 757. In addition, the controller 100 processes the previous selected service channel by performing steps 761-765. In this case, since there is no change service channel data in the broadcast data storage unit 130 (that is, there is no stored data of the change service channel), reproduction of data is performed when data of the selected service channel is burst time (i.e., next). Burst time). In this case, preset multimedia data may be played until broadcast data of the changed service channel is received.

For example, when the user selects CH2 or CH6 while reproducing the data of CH4 and buffering the data of CH2 and CH6 as shown in FIG. 7E, the controller 100 detects that the changed service channel is the preferred service channel. Access and reproduce the data of the changed service channel buffered in the corresponding buffer of the broadcast data storage unit 130, and set 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 selection channel and buffers the CH4 service channel. Set to channel. Also, when a service channel (eg CH1) not registered as the preferred service channel is selected while playing a service channel (eg CH3) not registered as the preferred service channel, the control unit 100 selects the CH1 service. Channel, and releases 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 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 5, in the broadcast play mode, the controller 100 selects the procedure as illustrated in FIG. 10. At the same time, the data of the buffering service channels is stored. In this case, the buffering service channels may be set to other physical channels to which the selected service channel does not belong, and the buffering service channels may be adjacent service channels of the selected service channel and / or preferred service channels having high selection preferences of the user. . In FIG. 1, tuners 270 of the broadcast reception and storage units 111-11N are set to different physical channels by the controller 100, and the broadcast data demodulator 290 is configured to control buffering service channels set by the controller 100 in the corresponding physical channels. PIDs are set. In addition, the broadcast data storage unit 300 of the broadcast reception and storage unit 111-11N includes buffers 331-33Ns capable of storing broadcast data of buffering service channels set in a corresponding physical channel, and the first selector 320 is configured for the buffering service channel. Switching (or selecting) the data of the received service channel to a corresponding buffer under control of the control unit 100 when broadcast data is received, and the second selector 340 selects a service from among the buffering service channels. Performs the function of switching (or selecting) the buffer output of the channel.

In this case, the second selector 340 of the broadcast data storage units 300 of the broadcast reception and storage unit 111-11N may operate differently according to each physical channel. That is, the second selector 340 located in the broadcast reception and storage unit of the physical channel to which the selected service channel belongs outputs broadcast data of the selected service channel. However, the second selectors 340 located in the broadcast reception and storage units of the physical channels to which the selected service channel does not belong cannot output broadcast data of the selected service channel. In this case, the controller 100 may control the second selector 340 of the physical channels to which the selected service channel does not belong so that the output of broadcast data is not selected. In this case, only the data of the selected service channel is input to the selector 120. In this case, the selector 120 transmits the input service channel data to the broadcast data decoder 140 as it is. However, when the second selectors 340 in the broadcast reception and storage units of the physical channels that do not belong to the selected service channel selectively output data of the previous selected service channels, the selector 120 is controlled by the controller 100 to control the selection service. The service channel data output from the second selector 340 of the physical channel to which the channel belongs may be selectively output. In addition, the second selector 340 and the selector 120 of the broadcast data storage 300 of the broadcast reception and storage 111-11N may be configured as one selector. In this case, the configuration of the second selector 340 of the broadcast data storage units 300 is omitted, and the output of the buffers of the broadcast data storage units 300 is connected to the selector 120, and the control unit 100 selects the selector 120. (Or switching) may be controlled.

The broadcast data output from the selector 120 becomes broadcast data of a selected service channel, and the broadcast data is applied to the broadcast data decoder 140 in a structure of an IP datagram and decoded. At this time, the broadcast data decoder 140 has the configuration as shown in FIG. Accordingly, the protocol processor 410 extracts a protocol from the IP datagram, and the extracted protocol information is processed by the controller 100. In addition, the broadcast data processed by the protocol is demultiplexed into audio data, video data, and broadcast service (or program) data (ESG or EPG) data in the demultiplexer 420. In the embodiment of the present invention, it is assumed that the broadcast service data is applied to and processed by the controller 100. The audio and video data demultiplexed by the demultiplexer 420 are encoded data. The audio and video data are decoded and applied to the audio decoder 440 and the video decoder 430, respectively.

If a change of the service channel is requested in the state of performing the broadcast play mode as described above, the controller 100 checks the physical channel to which the changed service channel belongs, and the physical channel to which the changed service channel belongs and the physical to which the previous selected service channel belongs. Reset the channel's buffering service channels. In this case, the changed service channel and the previous selected service channel may belong to the same physical channel and may also belong to other physical channels. Accordingly, as shown in FIG. 12, the controller 100 resets buffered service channels of the physical channels to which the changed service channel and the previous selected service channel belong.

The control unit 100 identifies the physical channel to which the changed service channel belongs, and controls the broadcast data storage unit 300 corresponding to the broadcast reception and storage unit among the broadcast reception and storage units 111-11N to change the requested service channel data. Select and output the data buffered. That is, the controller 100 controls the selector 120 to select the output of the buffer of the broadcast data storage 300 buffering the data of the changed service channel and apply the buffer output 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 while performing the broadcast reproduction mode, and the reproduction time depends on the size of the buffered data. In general, the burst data may be generated with a period of 1 second to 4 seconds, and the sizes of the buffers 331 to 33N are set in consideration of this. The controller 100 resets the PIDs and the buffers of the selected service channel (in this case, the changed service channel) and the buffered service channels while reproducing the buffered data when the service channel is changed. In this case, the buffering service channel may be adjacent service channels and / or preferred service channels as described above. The resetting of the buffering service channels sets a PID in the broadcast data demodulator 290 and controls a first selector 320 of the broadcast data storage unit 300 to set a buffer for storing broadcast data of the buffering service channel.

In addition, the embodiment of the present invention has been described with an example in which different physical channels are set in the broadcast reception and storage 111-11N, and service channels of each physical channel are set and buffered. However, a physical channel of a selected service channel is set in a tuner of a specific broadcast receiver and a storage, and a service channel is set in a broadcast data demodulator, a physical channel of a selected broadcast channel is set in a tuner of another broadcast receiver and a storage, It is also possible to configure buffering service channels. That is, the physical channel of the selected service channel is set in the tuner of the first broadcast receiver and the storage 111, the PID of the selected service channel is set in the broadcast data demodulator, and the selected service is tuned in the tuner of the second broadcast receiver and the storage 112. A physical channel of a channel may be set and buffered service channels may be set in a broadcast data demodulator. In this case, the selected service channel and the buffered service channels transmitted to the same physical channel may be processed through different broadcast receivers and storage units.

1 to 13C 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. 14 is a diagram showing the configuration of another digital broadcast receiver.

In FIG. 14A, the first broadcast receiver and storage unit 901-90N includes a tuner 910, a broadcast data demodulator 920, a demultiplexer 930, and a broadcast data storage unit 940 as shown in FIG. 14B, and the broadcast data decoder 950 includes an IP decapsulator and It does not have a demultiplexer. Herein, the control unit 100 sets a physical channel through the tuner 910, sets a buffering service channel of the corresponding physical channel through the demultiplexer 930, and stores data of the buffering service channel set through the broadcast data storage unit 940.

14A and 14B, 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 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 while the program is being executed. 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 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 filters and demultiplexes data having a PID of a selection and / or buffering service channel under the control of the controller 900. The broadcast data storage unit 940 stores and outputs data of a selection and buffering service channel under the control of the control unit 900. The selector 945 selects and outputs data of a selected service channel from among broadcast data output from the broadcast data storage 940 of each physical channel. 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 with reference to FIGS. 14A and 14B, 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 contain IP information (ie, they are not IP datagrams), and do not perform PID filtering in the broadcast data demodulator 920. will be. Therefore, the digital broadcast receiver having the configuration as shown in FIGS. 14A and 14B must perform (filter) PID filtering of the selected service channel and the buffered 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 packets are composed of a packet header and payload (additional information and / or and / or A / V data), and the packet header and payload are composed of 188 bytes. 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 by 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: additional information only / no payload 11: both additional information and payload present 00: preliminary 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 under the control of 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 channel 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. 8. 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. 9 to 13C. At this time, since it is not an IP datagram including IP information received by the digital broadcast receiver as shown in FIGS. 14A and 14B, the protocol processing procedure is not performed. Accordingly, except for the process of processing the IP information in the process of FIGS. 8 to 13C, the operations of the digital broadcast receiver having the configuration as shown in FIGS. 14A and 14B 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. 15 shows the configuration of a mobile terminal including the digital broadcast receiver. FIG. 15 is applicable to both a mobile terminal having a DVB_H digital broadcast receiver as shown in FIG. 1 and a mobile terminal having a DMB and DVB-T digital broadcast receiver as shown in FIGS. 14A and 14B. .

Referring to FIG. 15, in the case of a 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 270 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 (25)

In the device for changing the service channel of the digital broadcast receiver, 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, selecting and outputting at least one buffered service channel data, and a service channel output from the broadcast data demodulator At least two broadcast receiving and storing units respectively storing data in corresponding buffers and having broadcast data storage units for selectively outputting an output of a buffer for storing data of the selected service channel; A selector for selecting data of a selected service channel at an output of the broadcast reception and storage units; A broadcast data decoder for decoding service channel data output from the selector; A display unit and a speaker for displaying the decoded data, When the service channel is changed, the buffering data of the changed service channel is selected and reproduced as selected service channel data, and the broadcasting channel to which the change and the previous selected service channel belong and the buffering channel of the storage unit are reconfigured. Service channel changer. The method of claim 1, And a service channel change control unit which checks the physical channel of the changed service channel when the service channel is changed and resets the buffering service channels of the physical channels to which the changed and previous selected service channel belongs. Device for changing service channel. The method of claim 2, wherein the broadcast data demodulator, A demodulator for demodulating the received service channel signal; And the identifier of the selection and buffering service channel is set, and comprises an identifier filter for selectively outputting the service channel data of the set identifier from the demodulated service channel data. 4. The apparatus of claim 3, wherein the identifier is a program identifier (PID). The method of claim 3, wherein the broadcast data storage unit, Buffers for selecting and 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. 6. The apparatus of claim 5, wherein the buffering service channel is an upper service channel and a lower service channel of the selected service channel. The method of claim 6, wherein, when the service channel is changed, the service channel change control unit selects and plays data of the changed service channel, and buffers a previous lower service channel if the changed service channel is an upper service channel of the selected service channel. Release from the service channel and set the upper service channel of the changed service channel to the buffering service channel, and if it is a lower service channel of the selected service channel, release the previous upper service channel from the buffering service channel and then lower service bond of the changed service channel. And a channel set to a buffering service channel. 6. The apparatus of claim 5, wherein the buffering service channels are preferred service channels with high user preference. 10. The method of claim 8, 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 if the previous selected service channel is the preferred service channel, the buffering. And a service channel change device for the digital broadcast receiver. 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, identifiers of a selected service channel and at least one buffered service channel are set, and service channel data of the set identifier And 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. At least two broadcast receiving and storing units, A selector for selecting data of a selected service channel at an output of the broadcast reception and storage units; A broadcast data decoder for decoding service channel data output from the selector; A display unit and a speaker for displaying the decoded data, When the service channel is changed, the buffering data of the changed service channel is selected and reproduced as selected service channel data, and the broadcasting channel to which the change and the previous selected service channel belong and the buffering channel of the storage unit are reconfigured. Service channel changer. A method of changing a service channel of a digital broadcast receiver having at least two physical channels, Setting a selected service channel and at least one buffering service channel identifier; In the broadcast mode, the service channel received through each of the physical channels is analyzed, and if the selected service channel, the data of the received service channel is reproduced and displayed; if the buffered service channel, data of the received service channel is set to the corresponding physical channel. Storing in a buffering service channel buffer; If a service channel change is requested in the broadcast mode, the output of the buffer storing the changed service channel data is selected and reproduced, and after resetting the buffering service channels of the physical channel of the change and previous selected service channel, the broadcast mode is selected. The service channel changing method of the digital broadcast receiver, characterized in that the process of changing the service channel proceeds to. 12. The method of claim 11, wherein the buffering service channels are adjacent service channels having upper and lower service channel numbers of the selected service channel. The method of claim 12, wherein the service channel change process, Setting the changed service channel as a selected service channel, reproducing and displaying data of the stored changed service channel; If the change service channel is an upper service channel of the previous selected service channel, releasing a previous lower service channel from a buffering service channel, setting an upper service channel of the changed service channel as a buffering 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 previous upper service channel from the buffering service channel, setting the lower service channel buffering service channel of the changed service channel, and then proceeding to the broadcast mode. And a service channel change method of the digital broadcast receiver. The method of claim 13, wherein the performing of the broadcast mode comprises: Inspecting service channels of each physical channel received; If the service channel is the selected service channel, displaying a broadcast screen for processing and displaying data of the received selected service channel; If the service channel is an upper service channel, storing the data of the received service channel in the set upper service channel buffer; and if the service channel is a lower service channel, storing the data of the received service channel in the set lower service channel buffer. A service channel change method of the digital broadcast receiver. 12. The method of claim 11, wherein the buffering service channels are preferred service channels set by the user's preference. The method of claim 15, 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. Process, After the selection of the selected service channel, if the previous selected service channel is a non-preferred service channel, if the preferred service channel is maintained as a buffered service channel, the process of changing the service channel of the digital broadcast receiver is performed. . The method of claim 16, wherein the performing of the broadcast mode comprises: Analyzing the service channel upon receiving the service channel data; If the service channel is the selected service channel, displaying a broadcast screen for processing and displaying data of the received selected service channel; And if the service channel is a preferred service channel, storing data of the received service channel in a set corresponding service channel buffer. The digital broadcasting as claimed in claim 11, wherein the buffering service channels are 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. How to change service channel of receiver. The method of claim 12, wherein the service channel change process, Setting the changed service channel as a selected service channel, reproducing and displaying data of the stored changed service channel; If the change 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 previous lower service channel is released from the buffering service channel and After setting an upper service channel as a buffering service channel, the process proceeds to the broadcast mode, and if it is a lower service channel of the previous selected service channel, releases the previous upper service channel service channel from the buffering service channel and removes the lower service channel of the changed service channel. Setting a buffering service channel and then proceeding to the broadcasting 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 change service channel is reproduced and displayed; if the non-preferred service channel, the change service channel is set as the selected service channel; And after setting the selected service channel, if the previous selected service channel is a non-preferred service channel, releasing the service channel, and maintaining the buffered service channel if the preferred service channel is performed, proceeding to the broadcast mode. How to change service channel of receiver. The method of claim 12, wherein the service channel change process, 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 it is a 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 change service channel is reproduced and displayed. 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. Method of changing service channel of 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 buffering data of the changed service channel to select service channel data. And a controller for processing a call generated in the broadcast mode through the wireless communication unit, And a display unit for displaying data of the decoded service channel and data processed in the communication mode, and a speaker. 22. The method of claim 21, wherein, 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 to the broadcast data demodulator. And resetting the buffers of the broadcast data storage unit at the same time as setting the reset identifiers of the digital broadcast receivers. 23. The portable terminal as claimed in claim 22, wherein the control unit displays an incoming call alert including incoming subscriber information on the display unit when an incoming call occurs in the broadcast mode. 23. The portable terminal device as claimed in claim 22, wherein the control unit transmits the outgoing data through the wireless communication unit when an outgoing signal is generated in the broadcasting mode. 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 buffered data of the changed service channel to select service channel data. And a controller for processing a call generated in the broadcast mode through the wireless communication unit, And a display unit for displaying data of the decoded service channel and data processed in the communication mode, and a speaker.

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