KR20070094318A - Broadcast receiving device and broadcast transmitting and receiving method - Google Patents

Abstract

The present invention relates to a broadcast receiving device and a broadcast transmitting and receiving method. In one aspect of the invention, the invention provides a method comprising the steps of: (a) receiving a channel switch control signal; (b) determining whether the channel to be switched is a user's preferred channel; (c) determining whether the broadcast signal of the channel is stored in the case of the preferred channel as a result of the determination; And (d) expressing the stored broadcast signal on a screen when the broadcast signal of the channel to be switched is stored as a result of the determination of step (c). According to the present invention, the waiting time until the broadcast of the selected channel is switched and displayed when switching channels can be reduced.

Description

Apparatus for receiving broadcasting and method for transmitting and receiving broadcasting}

1A is a conceptual diagram schematically illustrating the concept of the delta-tee method.

1B is a conceptual diagram schematically illustrating a burst signal of a time division transmission method.

2 conceptually illustrates an example of multiple transport streams in which multiple burst signals are transmitted on a transmission path;

3 is a flowchart illustrating an embodiment of a broadcast receiving method according to the present invention.

4 is a structural diagram of an embodiment of a broadcast receiving device according to the present invention;

5 is a conceptual diagram of a transmission signal stream in order to easily explain an embodiment of a broadcast signal transmission method according to the present invention;

<Explanation of symbols in the main part of the drawing>

10: broadcast signal receiving unit 20: control unit

30: memory part 32: first memory part

35: second memory unit 40: display unit

The present invention relates to a broadcast receiving apparatus and a broadcast transmitting / receiving method, and more particularly, to a broadcast receiving apparatus and a broadcast transmitting / receiving method having a fast channel switching speed.

Digital video broadcasting-handheld (DVB-H), which has emerged as a competitive model for terrestrial digital multimedia broadcasting (DMB), is being evaluated as a model that can converge broadcasting and communication. DVB-H is a transmission system that extends the broadcast area to the mobile portable terminal area and transmits transmission information as an IP datagram.

IP datagram refers to a signal processing method of sending a signal in a packet by using an internet protocol. DVB-H has an IP protocol for transmitting voice and video signals (audio / video) by packet unit and compressing them.

DVB-H uses a time slicing multiplexing method, which is a multiplexing method that divides a channel's capacity into a predetermined time slot and loads a packetized broadcast signal in each time slot. .

The broadcast receiving device can reduce power consumption when receiving a time-divided packet broadcast signal in a time slot like the DVB-H method, but when a user switches channels, the broadcast receiving device must wait for the time-divided packet signal of the switched channel. Therefore, the channel switching time is a long problem.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to provide a broadcast receiving apparatus and a broadcast transmitting / receiving method with a fast channel switching speed.

In order to achieve the above object, the present invention comprises the steps of (a) receiving a channel switch control signal; (b) determining whether the channel to be switched is a user's preferred channel; (c) determining whether the broadcast signal of the channel is stored in the case of the preferred channel as a result of the determination; And (d) expressing the stored broadcast signal on a screen when the broadcast signal of the channel to be switched is stored as a result of the determination of step (c).

The stored broadcast signal is preferably a time division burst signal.

In another aspect, the present invention provides a method for generating a broadcast signal, comprising: generating a plurality of broadcast services to be transmitted as compressed signals; And transmitting the respective compressed signals for the generated broadcast services in a time-divided burst signal, and transmitting the burst signals in coincidence with the transmission time points of the burst signals. .

Each burst signal of the broadcast services is preferably the same burst duration (burst duration).

In another aspect, the present invention provides a broadcast signal receiving unit capable of simultaneously receiving one or more broadcast services; A memory unit capable of storing a broadcast service of a channel watched by a user and a broadcast service of a channel preferred by the user among broadcast services output by the broadcast signal receiver; And a controller for receiving a channel switching control signal of a user and outputting a broadcast service stored in the memory unit when the channel to be switched by the signal is a channel providing a broadcast service stored in the memory unit. A broadcast receiving apparatus is provided.

The memory unit may include a first memory unit for storing and outputting a broadcast service of a currently displayed channel; And a second memory unit for storing a broadcast service of a channel preferred by the user.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention that can specifically realize the above object will be described with reference to the accompanying drawings.

In the following embodiment, a case of receiving a broadcast signal of the DVB-H method is described as an example for ease of explanation. However, the present invention is applicable to a signal receiving apparatus for transmitting a time-division packet signal in burst units. It is possible.

First, the broadcast signal transmission format of DVB-H will be described.

DVB-H transmits a packetized broadcast signal in a time slot using a time slicing multiplexing method.

For example, if a DVB-H transmitter compresses a signal of 10 seconds in transmission time and transmits it with a new width of 3 seconds in transmission time, the receiver temporarily stores the compressed signal transmitted as described above in a buffer, Play the multimedia video while unzipping.

As described above, the DVB-H transmits a compressed signal using a time division multiplexing method and a timeslot, thereby reducing power consumption of the signal receiving terminal and performing a seamless handover of the transmission signal.

1A and 1B are conceptual diagrams of signal transmission illustrating a concept of broadcast signal transmission of DVB-H. A broadcast signal transmission method of DVB-H will now be described with reference to FIGS. 1A and 1B.

1A is a conceptual diagram of a delta-t method. In the DVB-H system, the time slicing transmission method transmits a burst signal in units of frames by a delta-t method. The delta tee method is a method of notifying reception start time of a burst signal of a next frame from a section signal of a burst signal of a current frame.

Since all section signals of the current frame inform the relative difference until the start time of the burst signal of the next frame, the broadcast reception device stably stores the received signal and decodes the compressed signal until the next burst signal is received. can do.

1B shows parameters related to the transmission signal. In FIG. 1B, a burst duration means a time when one burst is transmitted, and a burst size means a bit size on a network layer through which one burst is transmitted.

Burst bandwidth refers to a bit rate when transmitting one burst, and constant bandwidth refers to an average bit rate required for transmitting an elementary stream.

Off time means a time interval in which two bursts are transmitted, respectively. Synchronization time is a time taken to demodulate a received broadcast signal from a physical layer and a data link layer to obtain an IP datagram. Synchronization time is about 200 ~ 250ms for the DVB-H signal, and considering the signal received through the multipath, an error of about 10ms may occur in the delta jitter.

When receiving the DVB-H signal, the time slicing method can reduce power consumption by about 90%, but the standby time may take about 6 seconds.

However, since the synchronization time is increased during channel switching, the channel conversion waiting time of the user may be longer.

2 is a diagram conceptually illustrating an example of a multiple transport stream in which a plurality of DVB-H scheme signals are transmitted on a transmission path.

When the broadcast reception device receives the transmission signal as shown in FIG. 2, the broadcast reception device receives program specific information / system information (PSI / SI) from the reception signal and transmits the received information to an upper application layer. Broadcast related information may be displayed to the user at the application layer.

When the receiver of the broadcast reception device receives the burst signal, the receiver powers off and powers on again when the next burst starts. The received signal is displayed to the user through a signal decoding operation in the application layer after an error correction algorithm such as Reed Solomon (RS) is performed.

If the user changes the channel to the third service (service 2) while currently watching the first service (service 1), the user must wait for the channel to be changed for the waiting time of A sec.

A second is the sum of the time from when the user's channel change control signal is recognized by the broadcast reception device until the burst of the third service is received and the error decoding and the signal decoding operation of the application layer are completed.

Therefore, the user waits for the display of the changed screen when the channel is changed is longer than the burst interval for the service of one channel.

3 is a flowchart illustrating an embodiment of a broadcast receiving method according to the present invention. An embodiment of a broadcast reception method according to the present invention will be described with reference to FIG. 3.

As an embodiment of the broadcast receiving method according to the present invention, there may be a first step of expressing broadcast information to a user (S10). The broadcast information may be any information for the user to select a channel, and may correspond to an electronic program guide (EPG).

The control signal for the broadcast channel selected by the user is received (S20). The user can select a channel without step S10.

It is determined whether the broadcast channel selected by the user is the preferred channel (S30). As a result of the determination, when it is not the preferred channel (S30 no), the broadcast transmitted through the broadcast channel selected by the user may be displayed on the screen (S90).

As a result of the determination in step S30, if it is the user's preferred channel (S30 yes), it may be determined whether the broadcast of the channel is already stored (S40).

If the broadcast of the user-selected channel is not the broadcast of the already stored channel (S40 no), the broadcast of the channel selected by the user is stored in the memory (S50). Then, the broadcast of the channel stored in the memory is displayed on the screen (S90).

If the broadcast of the user-selected channel is the broadcast of a channel that is already stored (S40 yes), since fast channel switching is possible, the channel selected by the user may be displayed on the screen (S90).

4 is a structural diagram of an embodiment of a broadcast receiving apparatus according to the present invention. An operation of an embodiment of a broadcast reception device will be described with reference to FIG. 4 as follows.

An embodiment of the broadcast receiving apparatus according to the present invention includes a broadcast signal receiving unit 10, a control unit 20, a memory unit 30, and a display unit 40.

The memory unit 30 may include a first memory unit 32 and a second memory unit 35.

The receiver 10 may receive a demodulated broadcast signal, demodulate it, and output the demodulated signal. The receiver 10 outputs decoded broadcast signal information, that is, PSI / SI information, to the controller 20, and outputs the decoded broadcast signal to the first memory unit 10.

The first memory unit 10 may output the currently received broadcast to the display unit 40 according to the selection of the controller 20.

The user may input a channel frequently watched by the controller 20. The controller 20 may store the broadcast of the user's preferred channel in the second memory unit 35 according to the user's input information.

The second memory unit 35 may store the amount of broadcast that is enough to display the converted channel immediately when the user switches channels. In the case of the DVB-H broadcast signal, since the burst size is 2 megabytes, the second memory unit 35 may store a capacity of (2 megabytes × number of preferred channels).

It is assumed that the user watches the A channel providing the first service and inputs the B channel and the C channel providing the second service and the third service, respectively, as the preferred channels.

The broadcast reception device according to the present invention outputs a first service on a screen, and outputs one or more bursts of the second service and one or more bursts of the third service received from the B and C channels to the second memory unit 35. Can be stored.

When the user switches from the A channel to the B channel or the C channel, the control unit 20 of the broadcast reception device may output the second service or the third service of the second memory unit 35 to the display unit 40. Can be.

That is, the controller 20 receives a channel switching control signal of the user and outputs the service stored in the memory unit when the channel to be switched by the signal is a channel providing a service stored in the second memory unit 35. The channel switching speed can be increased. Therefore, according to the broadcast reception device according to the present invention, the channel switching speed is high.

5 is a conceptual diagram of a transmission signal in order to easily explain an embodiment of a broadcast signal transmission method according to the present invention.

As described above, a system for transmitting a transmission signal using a time-slicing scheme may reduce power consumption of the broadcast reception device.

Therefore, when a broadcast signal is transmitted in a time slicing manner, such as DVB-H, if a service of the broadcast signal is grouped and transmitted, the channel switching speed may be increased when a preferred channel is selected.

In the above description, grouping transmission signals means that transmission times of time-divided burst signals for each broadcast service are matched and transmitted. In addition, when the burst signals are grouped and transmitted, the burst duration of each burst signal is preferably the same.

For example, when the broadcast transmitter groups and transmits burst signals of a service 1 broadcast signal, a service 2 broadcast signal, and a service 3 broadcast signal of an entertainment channel, the broadcast reception device transmits the service 1, the service 2, and the service 3. You can quickly switch between channels.

When the broadcast transmitting side groups and transmits the packets of the service 4 broadcast signal, the service 5 broadcast signal, and the service 6 broadcast signal of the sports channel, the broadcast reception device switches the channel between the service 4, the service 5, and the service 6. Can be done quickly.

Since the services of interests are grouped and transmitted, the user can increase the channel switching speed between the services and can conveniently watch the broadcast.

It is easy for a person skilled in the art to change or modify the present invention from the present specification. Therefore, although an embodiment of the present invention has been described above clearly, various modifications thereof should be made without departing from the spirit and the scope of the present invention.

According to the broadcast reception apparatus and the broadcast transmission / reception method according to the present invention described above, it is possible to reduce the waiting time until the broadcast of the selected channel is switched and displayed when switching channels.

Claims (6)

(a) receiving a channel switch control signal; (b) determining whether the channel to be switched is a user's preferred channel; (c) determining whether the broadcast signal of the channel is stored in the case of the preferred channel as a result of the determination; And and (d) displaying the stored broadcast signal on the screen when the broadcast signal of the channel to be switched is stored as a result of the determination of step (c). The method of claim 1, And the stored broadcast signal is a time-divided burst signal. Generating a plurality of broadcast services to be transmitted as compressed signals; And Transmitting each of the compressed signals for the generated broadcast services in a time-divided burst signal, and transmitting the burst signals in coincidence with the transmission time points of the burst signals. The method of claim 3, wherein Each burst signal of the broadcast services is characterized in that the burst duration (burst duration) is the same. A broadcast signal receiver capable of simultaneously receiving one or more broadcast services; A memory unit capable of storing a broadcast service of a channel watched by a user and a broadcast service of a channel preferred by the user among broadcast services output by the broadcast signal receiver; And And a controller for receiving a channel switching control signal of a user and outputting a broadcast service stored in the memory unit when the channel to be switched by the signal is a channel providing a broadcast service stored in the memory unit. Broadcast receiving device. The method of claim 5, The memory unit may include a first memory unit for storing and outputting a broadcast service of a currently displayed channel; And And a second memory unit for storing a broadcast service of a channel preferred by the user.

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