KR20080107793A - Digital broadcasting system and a method for outputting digital broadcasting thereof - Google Patents

Abstract

A digital broadcasting output method and a digital broadcasting system are provided to view digital broadcasting continuously under weak electric field area of the tunnel lighting. A broadcast station(10,20) transmits digital broadcasting data including the frames of first broadcast data which is broadcast data of the current time and frames of second broadcast data which is broadcast data of the previous time(N-M) on a real time. The frames of second broadcast data are outputted until the previous time passes. The frames of the stored first broadcasting data combines the frames of received second broadcast data.

Description

DIGITAL BROADCASTING SYSTEM AND A METHOD FOR OUTPUTTING DIGITAL BROADCASTING THEREOF

1 is a diagram schematically illustrating a configuration of a digital broadcasting system according to an embodiment of the present invention.

2 is a diagram illustrating a frame structure of digital broadcast data transmitted from a broadcasting station of a digital broadcasting system according to an embodiment of the present invention.

3 is a block diagram of a digital broadcast receiving apparatus according to an embodiment of the present invention.

4 and 5 are flowcharts illustrating a digital broadcast output process of a digital broadcast receiver according to an embodiment of the present invention.

6 is an exemplary diagram for describing an operation process of a digital broadcast receiving apparatus according to an embodiment of the present invention.

The present invention relates to a digital broadcast system, and more particularly, to a digital broadcast system and a digital broadcast output method.

In general, digital broadcasting refers to a broadcasting service that provides a user with high quality, high sound quality, and higher service in place of a conventional analog broadcasting, and is classified into satellite digital broadcasting and terrestrial digital broadcasting.

Satellite digital broadcasting is mainly intended for mobile services, and is a broadcast capable of watching multi-channel multimedia broadcasting anytime, anywhere through a portable receiver (mobile phone, personal digital assistant) or a vehicle receiver.

Terrestrial digital broadcasting, which is based on DAB (Digital Audio Broadcasting), is a concept of performing multimedia broadcasting for mobile reception using the VH channel 12, which is currently empty, and using TV, radio and data broadcasting using multiple channels. Means a broadcast that transmits a combination of the two.

Meanwhile, the digital broadcast receiver receives digital broadcast data transmitted from a broadcasting station through a satellite or a terrestrial repeater. The terrestrial repeater is installed in a place where a satellite signal such as a shadow area or an underground due to a high-rise building does not reach, and is used to transmit and receive digital broadcast data from a satellite.

Accordingly, the digital broadcast receiver can receive digital broadcast data even when the satellite signal cannot be reached regardless of the direction of the satellite and the satellite signal directly transmitted from the satellite through the terrestrial repeater.

However, if there are many shaded areas that do not have additional equipment such as repeaters, and the repeater is not installed in the shaded areas, the digital broadcasting receiver does not receive the digital broadcasting data. You can't do that anymore.

Therefore, when a user enters an astigmatism zone and a weak electric field while moving while receiving a digital broadcast, there is a high possibility that the digital broadcast cannot be temporarily received, which acts as a burden for providing a seamless and seamless broadcasting service. have.

Accordingly, an object of the present invention is to provide a digital broadcasting system and digital broadcasting output for allowing a user to continuously watch digital broadcasting even when the user enters an astigmatism zone and a weak electric field area while receiving a digital broadcasting and cannot receive the digital broadcasting temporarily. To provide a way.

In order to achieve the above object, the present invention provides a digital broadcast system, comprising frames of first broadcast data that is broadcast data of a current time N and frames of second broadcast data that is broadcast data of a previous time NM. A broadcast station transmitting the digital broadcast data in real time, and storing the frames of the first broadcast data when receiving the digital broadcast data, outputting the frames of the second broadcast data until the previous time elapses, and the previous time. When the elapsed time is elapsed, it comprises a digital broadcast receiving device that sequentially outputs the frames of the stored first broadcast data and the frames of the second broadcast data received from the time when the previous time elapsed.

The present invention also provides a digital broadcast receiver for receiving digital broadcast data including frames of first broadcast data that is broadcast data of a current time N and frames of second broadcast data that is broadcast data of a previous time NM; A memory for storing the frames of the first broadcast data, an output unit for outputting the received digital broadcast data, a frame of the first broadcast data included in the received digital broadcast data, and the previous time elapsed. Outputs the frames of the second broadcast data until the previous time elapses, and sequentially stores the frames of the first broadcast data and the frames of the second broadcast data received from the time point at which the previous time elapsed. And a control unit for controlling the output.

In addition, the present invention provides a digital broadcast output method of a digital broadcast receiver, in the digital broadcast output mode, frames of the first broadcast data that is broadcast data of the current time (N) and second broadcast that is broadcast data of the previous time (NM). Receiving the digital broadcast data consisting of frames of the data, separating the frames of the first and second broadcast data included in the received digital broadcast data, storing the frames of the first broadcast data, and Outputting frames of the second broadcast data until elapsed; and frames of the stored first broadcast data and frames of second broadcast data received from a time point at which the previous time elapses when the previous time elapses. It is characterized in that it comprises a process of sequentially outputting combined.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. It should be noted that the same elements in the figures are represented by the same numerals wherever possible. In addition, detailed descriptions of well-known functions and configurations that may unnecessarily obscure the subject matter of the present invention will be omitted.

1 is a diagram schematically showing a configuration of a digital broadcasting system according to an embodiment of the present invention.

The illustrated digital broadcasting system includes broadcasting stations 10 and 20 for constructing and broadcasting multimedia data into digital broadcasting data, and a digital broadcasting receiving apparatus 100 for receiving the digital broadcasting data and outputting the multimedia data. Here, the digital broadcasting data broadcast from the satellite broadcasting station 10 is transmitted to the digital broadcasting receiving apparatus 100 by the satellite 30, and the digital broadcasting data broadcasting from the terrestrial broadcasting station 20 (eg, KBS broadcasting station) is grounded. Is transmitted to the digital broadcast receiving device 100 by the repeater 40.

The digital broadcast data includes frames of first broadcast data that is broadcast data of a current time N and frames of second broadcast data that is broadcast data of a previous time (N-M). In addition, N is an integer and a value that changes over time, and M is a preset integer value.

In this case, the broadcast data of the previous time means data broadcast from a preset time. For example, when the preset integer value M is 5, when the current time N = 0, the previous time becomes 0-5 = -5 seconds, and the broadcast data of the previous time becomes data broadcast from 5CH.

Meanwhile, the frame structure of the digital broadcast data will be described below.

2 is a diagram illustrating a frame structure of digital broadcast data transmitted by a broadcast station in a digital broadcast system according to an embodiment of the present invention.

Referring to FIG. 2, broadcasters 10 and 20 typically transmit digital broadcast data of 30 frames per second. In an embodiment of the present invention, broadcasters 10 and 20 transmit frames of first broadcast data from 30 frames per second. 10 frames. The frame of the second broadcast data is changed to 20 frames and transmitted. This is just one example implemented in an embodiment of the present invention, and may be transmitted by setting the first and second broadcast data to 15 frames, respectively.

The broadcasting stations 10 and 20 perform an chronological order of absolute time, i.e., 10 frames of the first broadcast data of the current time and 20 frames of the second broadcast data 5 seconds ago when the current time is 0 when digital broadcast data is transmitted. When the absolute time passes by 1 second, 10 frames of the first broadcast data corresponding to 1 second of the current time and 20 frames of the second broadcast data 4 seconds ago are transmitted. Thereafter, whenever the absolute time elapses, the broadcasting stations 10 and 20 transmit the first broadcast data of the corresponding absolute time and the second broadcast data 5 seconds before the absolute time.

The digital broadcast reception apparatus 100 includes both a vehicle digital broadcast reception terminal and a portable digital broadcast reception terminal. When the broadcasting stations 10 and 20 receive digital broadcast data transmitted in real time, the digital broadcast reception device 100 includes a first broadcast signal included in the digital broadcast data. The frames of the broadcast data are stored and the frames of the second broadcast data are output until the previous time elapses. That is, when the second broadcast data is broadcast data of 5 seconds or earlier, the digital broadcast reception device 100 outputs frames of the second broadcast data until 5 seconds elapses.

When the previous time (eg, 5 seconds) elapses, the digital broadcasting reception apparatus 100 receives the frames of the stored first broadcast data (eg, when the current time is 0 seconds to 4 seconds). Frames) and frames of second broadcast data received from a time point when the previous time elapses (for example, when the current time is 5 seconds) are sequentially output. That is, the first broadcast received and stored when the current time is 0 seconds and the frames of the second broadcast data received and stored when the current time is 5 seconds are combined and output, and the first broadcast received and stored when the current time is 1 second. The frames of the data and the frames of the second broadcast data received when the current time is 6 seconds are combined and output.

3 is a block diagram of a digital broadcast receiving apparatus according to an embodiment of the present invention.

The illustrated digital broadcast receiver 100 includes a digital broadcast receiver 110, a demodulator 115, and a digital broadcast signal measurer 120. And a key input unit 130, a controller 140, a memory 150, an audio data decoder 160, an image data decoder 170, a speaker 180, and a display 190.

The digital broadcast receiver 110 receives the digital broadcast data and outputs it to the demodulator 115. The digital broadcast data includes frames of first broadcast data that is broadcast data of a current time N and frames of second broadcast data that is broadcast data of a previous time (N-M). The number of frames of the first broadcast data and the number of frames of the second broadcast data may be the same at 15 frames per second, respectively, or the first broadcast data may be 10 frames per second, and the second broadcast data may be 20 frames per second. .

The demodulator 115 demodulates the digital broadcast data received by the digital broadcast receiver 110 into a digital data stream and outputs the demodulated data to the controller 140.

The digital broadcast signal measuring unit 120 measures the strength or bit error rate (BER) of the digital broadcast signal received by the digital broadcast receiving unit 110 under the control of the controller 140, and controls the result of the control unit 140. ) The controller 140 determines whether the digital broadcasting reception device 100 enters or leaves the weak electric field based on the measured result.

The key input unit 130 includes a character key, a numeric key, various function keys, and the like, and outputs a key input signal corresponding to a key input by the user to the controller 140.

The controller 140 controls the overall operation of the digital broadcast reception device 100 according to the embodiment of the present invention. In addition, the controller 140 parses the digital broadcast stream output from the demodulator 115 into an audio data stream and an image data stream, and outputs the speaker 180 and the audio data decoder 160 and the image data decoder 170 through the audio data decoder 160 and the image data decoder 170. Output to display unit 190.

When the digital broadcast data is received by the digital broadcast receiver 110, the controller 140 stores the first broadcast data frames of the current time included in the digital broadcast data in the memory 150, and transfers a predetermined time based on the current time. Control to output frames of the second broadcast data, which is the broadcast data, until the previous time (eg, 5 seconds) elapses.

The controller 140 outputs the frames of the second broadcast data until a previous time elapses, and when the previous time elapses, the controller 140 stores the frames of the first broadcast data stored in the memory 150 until the previous time elapses. Control to sequentially output the frames of the second broadcast data received from the point in time when the previous time has elapsed in order of time. For example, when the previous time is 5 seconds, the controller 140 outputs the frames of the second broadcast data until 5 seconds elapses, and when 5 seconds elapses, the controller 140 is received until the current time is 0 seconds to 4 seconds to receive the memory 150. The frames of the first broadcast data stored in and the frames of the second broadcast data received when the current time is 5 seconds are combined and sequentially output in the order of time.

That is, the controller 140 combines the frames of the first broadcast data received and stored when the current time is 0 seconds and the frames of the second broadcast data received when the current time is 5 seconds, and outputs the received data when the current time is 1 second. The combined frames of the first broadcast data and the frames of the second broadcast data received when the current time is 6 seconds are output together.

Meanwhile, when the digital broadcasting reception apparatus 100 enters the weak electric field, the controller 140 determines the time of entry of the weak electric field in the current time, and starts from the previous time (for example, 5 seconds) based on the determined current time. Control to sequentially output the frames of the received and stored first broadcast data. The controller 140 may determine whether the digital broadcast reception device 100 enters the weak electric field through the digital broadcast signal measurement unit 120.

In addition, the controller 140 determines that the digital broadcast data is received as the current time when the digital broadcast reception apparatus 100 leaves the weak electric field and receives the digital broadcast data again while outputting the first broadcast data frames. Thereafter, the frames of the first broadcast data included in the digital broadcast data are stored in the memory 150.

The controller 140 controls to output only frames of the second broadcast data included in the received digital broadcast data until a previous time (for example, 5 seconds) elapses based on the determined current time. Thereafter, when the previous time elapses, the controller 140 leaves frames of the first broadcast data stored in the memory 150 until the previous time elapses from the time when the digital broadcasting data is received from the weak electric field region and the previous time elapses. Control to sequentially output the frames of the second broadcast data received from the time elapsed time in the order of time.

The memory 150 may include a program memory and a data memory. The memory 150 may include various pieces of information selected based on various pieces of information and user selection information necessary for controlling the operation of the digital broadcast receiving apparatus 100 according to an embodiment of the present invention. Save it. In other words. ROM for storing the operation algorithm accessed by the controller 140 for the overall operation of the digital broadcast receiving apparatus 100, and data in accordance with the control command in the data processing process of the controller 140 It may be composed of a RAM (RAM).

The audio data decoder 160 receives the audio data stream under the control of the controller 140, decodes the audio data stream into an analog audio signal, and outputs the same to the speaker 180.

The image data decoder 170 receives the image data stream under the control of the controller 140, decodes the image data stream into an analog image signal, and outputs the same to the display unit 190. The speaker 180 and the display unit 190 serve as an output unit in the digital broadcast reception apparatus 100.

The display unit 190 may include a liquid crystal display (LCD) or the like, and displays various display data generated by the digital broadcast receiver 100 and a digital broadcast output screen decoded by the video processor. In this case, when the LCD is implemented using a touch screen method, the display unit 190 may operate as an input unit.

4 and 5 are flowcharts illustrating a digital broadcast output process of a digital broadcast receiver according to an embodiment of the present invention.

4 and 5 will be described below with reference to FIG.

When the digital broadcast output mode is executed, the controller 140 includes digital broadcast frames including frames of first broadcast data that is broadcast data of a current time and frames of second broadcast data that is broadcast data of a previous time (NM) based on the current time. Data is received through the digital broadcast receiver 110 (S110). In an embodiment of the present invention, it is assumed that the number of frames of the first broadcast data is 10 frames per second and the number of frames of the second broadcast data is 20 frames per second.

The controller 140 separates the frames of the first and second broadcast data included in the received digital broadcast data (S120).

The controller 140 stores the separated frames of the first broadcast data in the memory 150 (S130).

The controller 140 outputs the frames of the second broadcast data, which are broadcast data before a predetermined time, based on the current time until a previous time (for example, 5 seconds) elapses (S140).

The controller 140 checks whether the previous time has elapsed (S150). In this case, the controller 140 may include a separate timer (not shown) to check whether the previous time has elapsed.

The controller 140 may determine that the frames of the first broadcast data stored in the memory 150 and the second broadcast data received from the time point at which the previous time elapsed after the previous time elapsed as a result of the check. The frames are combined in chronological order and sequentially output (S160).

For example, when the previous time is 5 seconds, the controller 140 outputs frames of the second broadcast data until 5 seconds elapses, and when 5 seconds, the previous time, elapses, the controller 140 receives the current time from 0 to 4 to receive the memory ( The frames of the first broadcast data stored in 150 and the frames of the second broadcast data received when the current time is 5 are combined and sequentially output. That is, the first broadcast data received and stored when the current time is 0 and the frames of the second broadcast data received and stored when the current time is 5 are combined and output. The frames and the frames of the second broadcast data received when the current time is 6 are combined and output.

The controller 140 checks whether the digital broadcast reception device 100 enters the weak electric field area (S170). The controller 140 determines whether the digital broadcast receiver 100 enters or leaves the weak electric field based on the strength or bit error rate of the digital broadcast signal measured by the digital broadcast signal measurer 120.

If the digital broadcast receiving apparatus 100 does not enter the weak field, as a result of the check, the controller 140 checks whether there is a broadcast output termination request (S180).

If there is no broadcast output termination request, the controller 140 returns to step S160, and if there is a broadcast output termination request, the controller 140 ends the digital broadcast output process.

On the other hand, the controller 140 checks whether the digital broadcast reception device 100 enters the weak field in step S170, and when the digital broadcast reception device 100 enters the weak field, the entry point of the weak field is entered. Determine the current time (S210).

The controller 140 sequentially outputs frames of the first broadcast data received from a previous time (eg, 5 seconds) based on the determined current time and stored in the memory 150 (S220).

The controller 140 checks whether the digital broadcast reception device 100 leaves the weak electric field area (S230).

If the digital broadcast reception device 100 leaves the weak electric field area, the controller 140 checks whether the broadcast output ends (S240). That is, the controller 140 checks whether there is a request for terminating the broadcast output from the user.

The control unit 140 terminates the digital broadcast output process if the broadcast output end request is found as a result of the check, and proceeds to step S110 if there is no broadcast output end request.

That is, the controller 140 determines the time point at which the digital broadcast data is received as the current time, and the first broadcast data frames of the current time and the frame of the second broadcast data which is broadcast data before a predetermined time based on the current time. Receive digital broadcast data including the data.

6 is an exemplary diagram for describing an operation process of a digital broadcast receiving apparatus according to an embodiment of the present invention.

2 and 6, the absolute time, that is, the interval from 0 second to 4 seconds in the current time in FIG. 6 is 4 from absolute time 0 seconds in FIG. 2 when the digital broadcast reception apparatus 100 performs the digital broadcast output mode. This section outputs only the second broadcast data frames (hatched portions) received in the second section. That is, in the embodiment of the present invention it can be seen that the previous time is assumed to be 5 seconds.

In FIG. 6, the absolute time 5 to 6 second intervals are frames of the first broadcast data received and stored in the absolute time 0 to 1 second interval after 5 seconds of the previous time, and the second received in the interval of 5 to 6 seconds absolute time. This is a section in which frames of broadcast data are summed and sequentially output. This section is composed of 30 frames per second by combining the first broadcast data image of 10 frames per second received and stored in an interval of 0 to 1 second absolute time and the second broadcast data image of 20 frames per second received in an interval of 5 to 6 seconds absolute time. Digital broadcast data is output.

In FIG. 6, the interval of 7 to 11 seconds in absolute time is, for example, when the user passes through a shaded area of about 5 seconds (for example, under a tunnel or a bridge). 2 is a section for outputting first broadcast data of 10 frames per second, which are received and stored in an absolute time section of 2 to 6 seconds of FIG. 2.

According to an exemplary embodiment of the present invention, the digital broadcasting apparatus 100 outputs digital broadcasting data of relatively low image quality of 10 frames per second in a shadow period, but the user can watch digital broadcasting without being completely disconnected.

In FIG. 6, an interval of 12 to 13 seconds in absolute time is an interval of outputting only second broadcast data frames (hatched portions) received in an interval of 7 to 8 seconds in absolute time of FIG. 2, and is not shown but is absolute after 5 seconds. From the time 17 seconds section, the frames of the first broadcast data received and stored in the digital broadcasting reception apparatus 100 from the absolute time 12 seconds section and the second broadcast data frames received from the absolute time 17 seconds section are sequentially output. Done.

In the above description of the present invention, specific embodiments have been described, but various modifications may be made without departing from the scope of the present invention. Therefore, the scope of the present invention should not be defined by the described embodiments, but should be determined not only by the claims but also by the equivalents of the claims.

As described above, the present invention can continuously watch digital broadcasting even if the user passes through a weak electric field area such as a bridge or a tunnel where digital broadcasting data is not received when watching digital broadcasting.

Claims (15)

In a digital broadcasting system, A broadcasting station transmitting in real time digital broadcast data including frames of first broadcast data that is broadcast data of a current time N and frames of second broadcast data that is broadcast data of a previous time N-M; Storing the frames of the first broadcast data and receiving the frames of the second broadcast data until the previous time elapses when the digital broadcast data is received; and the frames of the stored first broadcast data when the previous time elapses. And a digital broadcast receiver for sequentially outputting the frames of the second broadcast data received from the point in time at which the previous time has elapsed. The method of claim 1, And M is a preset integer value. The method of claim 1, And the number of frames of the first and second broadcast data has the same or different values. The apparatus of claim 1, wherein the digital broadcast receiving apparatus is When entering the weak field in the middle of combining the stored frames of the first broadcast data and the frames of the second broadcast data and outputting the current time, the starting point is determined based on the determined current time. And sequentially output the frames of the received and stored first broadcast data. The apparatus of claim 4, wherein the digital broadcast receiving apparatus is If the digital broadcast data is received while outputting the frames of the first broadcast data, the time point at which the digital broadcast data is received is determined as a current time, and the frames of the first broadcast data included in the digital broadcast data are stored. And only frames of the second broadcast data until a previous time elapses based on the determined current time. In the digital broadcast receiver, A digital broadcast receiver configured to receive digital broadcast data including frames of first broadcast data that is broadcast data of a current time N and frames of second broadcast data that is broadcast data of a previous time N-M; A memory for storing the frames of the first broadcast data; An output unit for outputting the received digital broadcast data; Storing the frames of the first broadcast data included in the received digital broadcast data and outputting the frames of the second broadcast data until the previous time elapses, and if the previous time elapses, the stored first broadcast data And a control unit for controlling the frames of the second broadcast data and the frames of the second broadcast data received from the time point at which the previous time elapses. The method of claim 6, The M is a digital broadcast receiver, characterized in that the preset integer value. The method of claim 6, And the number of frames of the first and second broadcast data has the same or different values. The method of claim 6, wherein the control unit When entering the weak field in the middle of outputting the frames of the first broadcast data and the frames of the second broadcast data together, the previous time is determined based on the determined current time after determining the time of entry into the weak field. And controlling to sequentially output the frames of the first broadcast data received and stored from the digital broadcasting receiver. The method of claim 9, wherein the control unit When the digital broadcast data is received while leaving the weak field in the middle of outputting the frames of the first broadcast data, the first broadcast data included in the digital broadcast data is determined after determining the time when the digital broadcast data was received as the current time. And store the frames of the second broadcast data until a previous time elapses based on the determined current time. In the digital broadcast output method of the digital broadcast receiver, Receiving digital broadcast data consisting of frames of first broadcast data that is broadcast data of a current time N and frames of second broadcast data that is broadcast data of a previous time N-M, in a digital broadcast output mode; Separating frames of the first and second broadcast data included in the received digital broadcast data, storing the frames of the first broadcast data, and outputting the frames of the second broadcast data until the previous time elapses. and, And sequentially outputting the frames of the stored first broadcast data and the frames of the second broadcast data received from the time when the previous time has elapsed when the previous time elapses. Digital broadcast output method. The method of claim 11, And M is a preset integer value. The method of claim 11, The number of frames of the first and second broadcast data has the same or different values, the digital broadcast output method of the digital broadcast receiving device. The method of claim 11, wherein the sequentially outputting Determining the entry time of the weak electric field area as the current time when entering the weak electric field area while the frames of the first broadcast data and the frames of the second broadcast data are combined and outputted; And sequentially outputting frames of the first broadcast data received and stored from a previous time on the basis of the determined current time. The method of claim 14, Determining when the digital broadcast data is received as a current time when the digital broadcast data is received while leaving the weak electric field while outputting the frames of the first broadcast data; Storing frames of first broadcast data included in the digital broadcast data; And outputting only frames of second broadcast data until a previous time elapses based on the determined current time.

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