KR20060118215A - Apparatus and method for recording of digital broadcasting signal - Google Patents

Abstract

A digital broadcasting recording apparatus and a method thereof are provided to prevent initially recorded data from being omitted during the period from the time when a user inputs a record key to the time when a recording operation is actually performed. A digital broadcasting recording apparatus includes a tuner and demodulator(112) for modulating a tuned digital broadcasting signal to generate first stream data, and an MPEG decoder(124) for analyzing information of the first stream data to select one of programs included in the first stream data, decoding second stream data corresponding to the selected program to generate video and audio signals. The apparatus further includes a recording/reproducing unit(114) for controlling a recording medium to read and write data, a background memory(120) for buffering the second stream data, and a controller(132) for controlling the recording/reproducing unit to combine the second stream data buffered in the background memory with the second stream data generated after the buffer data and record the combined data in the recording medium.

Description

Apparatus and method for recording of digital broadcasting signal

1 is a block diagram of an example of a conventional digital broadcasting recording apparatus;

2 is a view referred to in the description of a recording method in a conventional digital broadcasting recording apparatus;

3 is a block diagram of a digital broadcasting recording apparatus according to an embodiment of the present invention;

4 is a flowchart provided to explain a process of converting a digital broadcast signal received by a digital broadcast recording apparatus into a displayable signal according to an embodiment of the present invention;

5 is a flowchart provided to explain a recording method in a digital broadcasting recording apparatus according to an embodiment of the present invention; and

6 is a diagram referred to describe the structure of MPEG stream data.

 Explanation of symbols on the main parts of the drawings

112: tuner and demodulator 114: recording and reproducing section

116: drive 118: first memory

120: background memory 122: mux

124: MPEG decoder 126: second memory

130: key input unit 132: control unit

The present invention relates to a digital broadcasting recording apparatus and a recording method thereof, and more particularly, to a digital broadcasting recording apparatus capable of preventing a loss of initial recording data that may occur between a user's recording request and an actual recording operation. It relates to a recording method.

In general, digital broadcasting using digital signals has several advantages over analog broadcasting. For example, in the case of digital signals, a large amount of information can be easily transmitted using a compression technique. In analog broadcasting, only one program can be transmitted to one channel, but in digital broadcasting, several general programs or one high definition program can be transmitted. Can be. In addition, it is less susceptible to noise and distortion generated in the transmission process, and even if the signal is damaged, it can be completely restored, so that the viewer can watch with the same quality as the program sent from the broadcasting station.

The digital broadcast recording device demodulates and decodes the received digital broadcast signal, converts it into an audio and video signal that can be reproduced on a display device, and outputs the recorded digital broadcast signal on a recording medium such as an optical disk or a hard disk. A device capable of reproducing digital broadcast signals recorded on a medium.

1 is a block diagram of an example of a conventional digital broadcasting recording apparatus. Referring to FIG. 1, a conventional digital broadcasting recording apparatus includes a tuner and a demodulator 12, a recording and playback section 14, a drive 16, a first memory 18, a mux 22, and an MPEG. The decoder unit 24 includes a second memory 26, a key input unit 30, and a control unit 32.

The tuner and demodulator 12 demodulates a broadcast signal of a channel selected by a user from among digital broadcast signals received through the antenna 10, thereby stream data such as a DTV transport stream or an MPEG TS stream. Outputs

The drive 16 records data on a recording medium such as an optical disc or a hard disc, or reads data recorded on such a recording medium. The recording / reproducing section 14 controls the drive 16 to record the stream data output from the tuner and the demodulation section 12 on a recording medium mounted on the drive 16, or to record the data recorded on the recording medium. Play and output At this time, the first memory 18 is used as a data buffering place.

The MUX 22 allows any one of the tuner and demodulator 12 and the output of the recording and playback section 14 to be input to the MPEG decoder section 24. The MPEG decoder 24 decodes the stream data input through the mux 22 and outputs a displayable audio and video signal. At this time, the second memory 26 is used as a data buffering place.

Then, a user's operation command is input through the key input unit 30, and the controller 32 controls the overall operation of the digital broadcasting recording apparatus according to the user's operation command input through the key input unit 30.

In a conventional digital broadcasting recording apparatus having such a configuration, a process of recording a digital broadcasting signal on a recording medium by a user will be described as follows. First, when a channel to be watched is set, the tuner and demodulator 12 tunes and demodulates the corresponding channel and outputs stream data. The stream data output from the tuner and the demodulator 12 is input to the MPEG decoder 24 through the mux 22, and simultaneously input to the recording / reproducing section 14 to be recorded on the recording medium through the drive 16. It may be.

The mux 22 causes the stream data output from the tuner and the demodulator 12 to be input to the MPEG decoder 24 under the control of the control unit 32, and if the data is recorded on the recording medium. In the case of the reproduction mode for reproducing the audio signal, the stream data output from the recording / playback section 14 is input to the MPEG decoder 24. The MPEG decoder 24 analyzes the information of the input stream data and selects a desired program from the stream data.

After selecting a program, stream data corresponding to the selected program is buffered in the second memory 26 accessible by the MPEG decoder unit 24, MPEG decoding the buffered stream data, and then A reproducible audio signal and a video signal are output. This buffering, decoding, and video and audio signal output processes are repeatedly performed unless it is changed to another channel.

After the analysis of the information of the stream data is finished and the program selection is made, it is possible to record the selected program. When the record key is input to the control unit 32 through the key input unit 30, the recording operation is performed. That is, when a record key is input, stream data corresponding to the selected program is buffered in the area of the first memory 18 accessible by the recording / playback section 14 for recording the selected program, and generates information on the buffered stream data. After performing the process of extracting the necessary information, the stream data is recorded on the recording medium. In this case, the stream information is information recorded separately from the stream data, and means information necessary for reproducing and editing the stream data or performing trick play. This process is performed repeatedly until the recording operation is stopped. When the recording operation is stopped, the generated information is recorded based on the extracted stream information, and the recording operation is completed.

However, in order to generate a displayable signal by decoding the stream data due to the structural characteristics of the MPEG stream data, as described above, audio and video signals are output through a buffering process and a decoding process. In particular, since a certain amount of data needs to be buffered for a smooth decoding operation, when the user presses the record key, the actual recording start time starts from the scene after a certain time, not from the currently displayed scene. This is done. That is, as shown in Figure 2, even if the user wants to start recording by pressing the record key at the time of viewing the 'DISPLAY 1', since 'BUFFERING3' is already executed at this time, corresponding to the 'DISPLAY 1' Not the stream data, but the scene corresponding to the stream data 'DISPLAY 3' after a certain time is recorded, and 'DISPLAY 1', which is currently displayed, cannot be recorded. Therefore, there is a loss of the initial recording data between the time when the actual recording operation starts when the user presses the record key.

Accordingly, it is an object of the present invention to provide a digital broadcast recording apparatus and a recording method thereof capable of preventing the loss of initial recording data from the moment a user inputs a record key to the moment when an actual recording operation is performed.

In accordance with another aspect of the present invention, a digital broadcast recording apparatus includes: a tuner and a demodulator for demodulating a tuned digital broadcast signal to generate first stream data, and analyzing the information of the first stream data. An MPEG decoder which selects any one of the programs included in the stream data, decodes the second stream data corresponding to the selected program, and generates a displayable video and audio signal, and a recording which controls data to be recorded and read out on a recording medium. A reproducing unit, a background memory buffering the second stream data in a predetermined unit, and when inputting a recording command, combining the second stream data buffered in the background memory with second stream data generated after the buffered data. To control the recording and reproducing unit to be recorded on the recording medium. It includes.

Preferably, under the control of the control unit, a user's operation command including a mux for selectively providing any one of the tuner and the demodulator, the output of the recording and reproducing unit to the MPEG decoder unit, and the recording command. It further includes a key input unit for receiving the input to the control unit.

The predetermined unit is preferably a GOP (Group Of Picture) unit in MPEG, and the recording medium may be any one of an optical disc and a hard disc.

On the other hand, the recording method in the digital broadcasting recording apparatus according to the present invention, in the digital broadcasting recording apparatus for storing the stream data generated by demodulating the selected digital broadcast signal on the recording medium, by analyzing the information of the stream data, Selecting any one of the programs included in the stream data, buffering the stream data corresponding to the selected program in a predetermined unit, and generating a buffered stream data and the buffered stream data after inputting a recording command. Combining the stream data and recording the data onto the recording medium. Preferably, the method further includes decoding the stream data corresponding to the selected program and outputting a displayable video and audio signal.

Hereinafter, with reference to the drawings will be described the present invention in more detail.

3 is a block diagram of a digital broadcast recording apparatus according to an embodiment of the present invention. Referring to FIG. 3, the digital broadcast recording apparatus includes a tuner and a demodulator 112, a recording and playback unit 114, a drive 116, a first memory 118, a background memory 120, The MUX 122, the MPEG decoder 124, the second memory 126, the key input unit 130, and the control unit 132 are included.

The tuner and demodulator 112 demodulates a broadcast signal corresponding to a channel selected by a user from among digital broadcast signals received through the antenna 100 and stream data such as an MPEG TS stream (Transport Stream). Outputs

 The mux 122 causes any one of the outputs of the tuner, the demodulator 112, and the record / playback unit 114 to be input to the MPEG decoder 124 under the control of the control unit 32. The MPEG decoder 124 decodes the stream data input through the mux 122 and outputs a signal reproducible in the display apparatus, that is, a displayable audio signal and a video signal. In this case, the second memory 126 is used as a data buffering place.

 The drive 116 writes data to a recording medium such as an optical disc or a hard disk, or reads data recorded on the recording medium. The recording / reproducing section 114 controls the drive 116 to record the stream data output from the tuner and the demodulation section 112 on a recording medium mounted on the drive 116 or to a recording medium mounted on the drive 116. Outputs stream data that reproduces a title recorded in. In this case, the first memory 118 is used as a data buffering place, and the background memory 120 is used as a buffering place when performing the background recording function described later.

The key input unit 130 receives a key signal corresponding to the user's operation command, and the controller 132 controls the overall operation of the digital broadcasting recording apparatus according to the user's operation command input through the key input unit 130.

4 is a flowchart referred to for explaining a process of converting a digital broadcast signal received by a digital broadcast recording apparatus into a displayable audio and video signal and outputting the same according to an embodiment of the present invention. 3 and 4, first, a user sets a tuner to a channel to be watched (S200). Accordingly, the tuner and demodulator 112 demodulates the broadcast signal corresponding to the channel selected by the user, and outputs stream data such as an MPEG TS stream (S205).

In the normal viewing mode, the stream data output from the tuner and demodulator 112 is transmitted to the input of the MPEG decoder 124 through the mux 122. The MPEG decoder 124 analyzes the information of the input stream data, and how many programs are included in the stream data, where are the information packets for the program, and the audio stream packet ID. The video stream packet ID is analyzed to select a desired program (S210).

After the program is selected, the stream data of the selected program is buffered in the second memory 126 accessible to the MPEG decoder 124 (S215), and the MPEG decoder 124 decodes the buffered data. In operation S225, the displayable audio and video signals are output. After that, if the channel is not changed to another channel, the buffering, decoding, and audio and video signal output processes of steps S215 to S225 are repeatedly performed. By such a process, the tuned digital broadcast signal can be converted into a displayable audio and video signal and reproduced by the display device.

5 is a flowchart provided to explain a method of recording a digital broadcast signal received in a digital broadcast recording apparatus in a recording medium according to an embodiment of the present invention. 3 and 5, first, a user sets a tuner to a channel of a broadcast desired to be watched (S300). Accordingly, the tuner and demodulator 112 demodulates a broadcast signal corresponding to a channel selected by a user and outputs stream data such as an MPEG TS stream (S305). The stream data output from the tuner and demodulator 112 is transferred to the mux 122 and the recording / reproducing section 114. In the normal mode other than the reproducing mode for reproducing the data recorded on the recording medium, the mux 122 causes the stream data output from the tuner and the demodulator 112 to be input to the MPEG decoder 124, and the reproducing mode is used. In this case, the output from the recording / reproducing section 114 is input to the MPEG decoder section 124. That is, the stream data output from the tuner and the demodulator 112 is input to the MPEG decoder unit 124 through the mux 122 and decoded into a displayable signal, and is simultaneously input to the recording / reproducing unit 114 to drive 116. May be recorded on a recording medium mounted on the disk).

The MPEG decoder 124 analyzes the information from the stream data input through the mux 122 to determine how many programs are present in the TS stream, where are the information packets for the programs, and the audio stream packets. The ID and the video stream packet ID are analyzed to select a desired program (S310).

After the analysis of the information on the stream data is completed and the program selection is made, the selected program can be recorded. Therefore, the background recording process is performed from this point of time. The background recording process continuously buffers stream data corresponding to a program selected in a predetermined unit irrespective of a user's recording command by using an area of the background memory 120 accessible by the recording / reproducing unit 114. In this case, the background stream buffering and the background stream information extraction process are performed in the background memory 120 area without actually writing to the recording medium mounted in the drive 116 (S315 and S320).

In this case, the background memory 120 may be implemented by a FIFO method having a predetermined size. In this case, when the background memory 120 is full, the background memory 120 may be implemented by overwriting the previously written area. have. That is, the background recording process always proceeds as much as the size of the background memory 120 set to a certain size, so that the data that has been recently displayed to the user always exists in the background memory 120 area.

While performing the background recording process, it is checked whether or not the record key is input from the user through the key input unit 130 (S325). If there is no record key input, the background recording process of steps S315 and S320 is repeated. In contrast, when a record key is input through the key input unit 130 during the background recording process, the recording / reproducing unit 114 records the data recorded in the background memory 120 on a recording medium mounted on the drive 116. (S330), thereafter, the recording / reproducing unit 114 buffers the accessible first memory 118 to record the selected program subsequently, and extracts information necessary to generate information of the buffered stream, The buffered stream is recorded on the recording medium through the drive (S335, S340, S345). This process is repeatedly performed in the recording and playback section 114 until the recording operation is completed.

When recording stops, the generated information is recorded based on the extracted stream information (S355), and the recording operation is completed. In this case, the information to be recorded includes information on all streams to be recorded, and includes information on streams recorded in the background memory 120 and subsequent streams.

On the other hand, if the user presses the record key during the background recording process, the background recording operation is performed until the end of the GOP in a predetermined unit, for example, MPEG, and then the normal recording process is performed. . This is characteristic of MPEG stream data. As shown in FIG. 6, all MPEG streams generally start with an I picture because an I picture must be present to decode and display subsequent B and P pictures. It is desirable to process recording in units of GOP (Group Of Picture).

As described above, according to the present invention, it is possible to prevent the loss of the initial recording data between the moment when the user presses the record key and the time when the actual recording operation is performed. Accordingly, since the scene can be recorded from the scene displayed at the moment the user presses the record key, the user can improve the user's satisfaction.

In addition, although the preferred embodiment of the present invention has been shown and described above, the present invention is not limited to the specific embodiments described above, but the technical field to which the invention belongs without departing from the spirit of the invention claimed in the claims. Of course, various modifications can be made by those skilled in the art, and these modifications should not be individually understood from the technical spirit or the prospect of the present invention.

Claims (9)

A tuner and a demodulator for demodulating the tuned digital broadcast signal to generate first stream data; An MPEG-D that analyzes the information of the first stream data, selects one of the programs included in the first stream data, and decodes the second stream data corresponding to the selected program to generate a displayable video and audio signal. Coder portion; A recording and reproducing unit for controlling data to be recorded and read out from the recording medium; A background memory for buffering the second stream data in a predetermined unit; And And a controller configured to control the recording and reproducing unit to combine the data buffered in the background memory and the second stream data generated by demodulation after the buffered data when the recording command is input, to be recorded on the recording medium. Digital broadcast recording device. The method of claim 1, And a mux for selectively providing any one of the tuner, the demodulator, and the output of the recording / reproducing unit to an input of the MPEG decoder unit under the control of the controller. The method of claim 1, And a key input unit which receives a user's operation command including the recording command and transmits the same to the controller. The method of claim 1, And the predetermined unit is a GOP (Group Of Picture) unit in MPEG. The method of claim 1, The recording medium is a digital broadcasting recording apparatus, characterized in that any one of an optical disk and a hard disk. A recording method in a digital broadcasting recording apparatus for storing stream data generated by demodulating a tuned digital broadcasting signal on a recording medium, Analyzing the information of the stream data and selecting one of the programs included in the stream data; Buffering stream data corresponding to the selected program in a predetermined unit; And And combining the buffered stream data with the stream data generated by demodulation after the buffered stream data and recording them on the recording medium when a recording command is input. . The method of claim 6, And decoding the stream data corresponding to the selected program, and outputting a displayable video and audio signal. The method of claim 6, And the predetermined unit is a group of picture (GOP) unit in MPEG. The method of claim 6, And the recording medium is one of an optical disc and a hard disc.

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