KR20020081781A - Recording apparatus and method for digital broadcasting signal - Google Patents

Abstract

PURPOSE: A digital broadcasting signal recording device and a method thereof are provided to automatically discriminate a video mode for setting a recording mode accordingly in case of reservation recording, thereby effectively using a video tape. CONSTITUTION: A digital broadcasting signal recording device includes a cassette deck(1) for inserting a video tape, a remaining tape amount detecting part(2) for determining a recordable time of the tape inserted into the cassette deck, a PSIP(Program and System Information Protocol) extracting part(3) for extracting PSIP by receiving digital broadcasting signals, a PSIP buffer part(4) for storing the extracted PSIP information, an EPG information output part(5) for outputting EPG information in the OSD type according to the request of a user, and a recording mode/recording time determining part(6) for computing a broadcasting time zone by reading a start_time and a length_in_second of a current selected event from the PSIP buffer with reference to an event_id value provided from the EPG information output part.

Description

Recording apparatus and method of digital broadcasting signal {RECORDING APPARATUS AND METHOD FOR DIGITAL BROADCASTING SIGNAL}

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a digital VRL capable of recording a digital broadcast signal, and more particularly, to an apparatus and method for recording a digital broadcast signal when the remaining tape length is shorter than a selected program airtime during video recording using a video tape.

Recently, as digital broadcasting starts, recording apparatuses capable of recording for a long time while maintaining the original broadcast quality have been developed.

In particular, the D-VHS method, which can be stored for a long time digitally using a conventional VHS video tape as a recording medium, is representative, and this method can be used in various modes (HD, SD, LS2, LS3, LS5, LS7).

Based on DF-300 (T-150) tape, HD can record 2 hours and 30 minutes in high resolution mode, SD can record up to 5 hours twice as high as HD mode, and LS2 can use long time mode. It can record up to 10 times that of SD, 15 hours that is 3 times that of LS3, 25 hours which is 5 times that of LS5, and 35 hours which is 7 times that of LS7.

However, conventional D-VHS recording apparatuses generally do not distinguish the recording modes, and generally record a transport stream in a physical transport channel in a high resolution mode (HD).

In other words, it does not distinguish between a single program and a multi program, and it does not use tape efficiently by recording it as it is, and also does not utilize the program and system information protocol (PSIP) information. There is a problem that reservation recording is not possible in units.

Accordingly, the present invention was created to solve the above-mentioned conventional problems, and reserves a program on an event basis in an EPG (Electric Program Guide) environment in which a broadcast guide can be displayed using a database extracted from PSIP information of digital broadcasting. It is an object of the present invention to provide an apparatus and method for recording a digital broadcast signal that enables automatic setting of recording modes (HD, SD) in the case of recording (hereinafter referred to as "EPG reservation recording").

In addition, the present invention obtains the recordable time of the remaining amount of tape inserted in the determined recording mode, and compares the time with the airing time of the program selected by EPG reservation recording, and when the remaining tape amount is small, the recordable mode and recordable time can be recorded. It is an object of the present invention to provide an apparatus and method for recording a digital broadcast signal that allows a user to select whether to record the time as it is to the user and change the recording to a new tape.

1 is a block diagram showing the configuration of a digital broadcast signal recording apparatus according to the present invention;

2 is an exemplary view showing a structure of a general PSIP table.

3 is an exemplary view showing the structure of an ETT table in FIG.

4 is a flowchart illustrating a digital broadcast signal recording process according to the present invention.

*** Description of the symbols for the main parts of the drawings ***

1 cassette deck 2 tape remaining amount detection unit

3: PSIP information extraction unit 4: PSIP buffer

5: EPG information output unit 6: recording mode and recording time determination unit

The present invention for achieving the above object is a cassette deck for inserting a video tape; A remaining tape detection unit determining a recordable time of the tape inserted into the cassette deck; A PSIP information extraction unit which receives the digital broadcast signal and extracts the PSIP information; A PSIP buffer for storing PSIP information extracted by the PSIP information extracting unit; An EPG information output unit for outputting EPG information in OSD form according to a user's request; Determining a recording mode and a recording time for calculating the broadcast time zone by reading the start time (start_time) and the broadcast time (length_in_second) values of the currently selected event from the PSIP buffer with reference to the event ID (event_id) value provided by the EPG information output unit. Characterized in that it comprises a portion.

In addition, the present invention made of the above-described technical configuration comprises a first step of outputting an event ID corresponding to a program (event) to be scheduled recording by the user is selected; Detecting a broadcast time for the selected program from PSIP information; Determining a video transmission mode of the selected program and setting a recording mode accordingly; A fourth step of comparing the recordable time by the remaining tape amount with the broadcast time of the detected program to determine whether recording of the entire program is possible with the remaining tape remaining amount; In the determination result, if the recording of the entire program is possible, the recording reservation is made, and if the remaining tape amount is smaller than the event airing time, the user is notified of the fifth step of replacing the tape.

Hereinafter, an embodiment according to the present invention will be described in detail with reference to the accompanying drawings.

First, Fig. 1 is a block diagram showing the configuration of a digital broadcast signal recording apparatus according to the present invention, and as shown therein, a cassette deck 1 for mechanically inserting a video tape; A remaining tape detection unit (2) for determining a recordable time (T-60, T-120, etc.) when the tape is inserted into the cassette deck (1); A PSIP information extraction unit 3 for receiving the digital broadcast signal and extracting the PSIP information; A PSIP buffer 4 for storing PSIP information extracted by the PSIP information extracting unit 3; An EPG information output unit 5 for outputting EPG information in the form of an OSD according to a user's request; The broadcast time zone is calculated by reading the start time (start_time) and the broadcast time (length_in_second) of the currently selected event from the PSIP buffer 4 with reference to the event ID (event_id) value provided by the EPG information output unit 5. It consists of a recording mode and a recording time determination part 6.

In this case, the tape remaining amount detecting unit 2 always determines the remaining amount at the current position of the tape, and provides a recordable time based on the HD mode unless the tape is removed from the cassette deck.

In addition, the PSIP buffer 4 stores a PSIP information for each channel to build a database, and for each minor channel listed in a virtual channel table (VCT) of the PSIP table even in a corresponding major channel region. Divide the area again.

Here, the main channel refers to broadcasting stations such as SBS, KBS, MBC, and the like, and the subchannels are classified genres, and can mean, for example, sports, drama, and news. It can be fluid, depending on how the station operates.

That is, a broadcasting station may continuously transmit only one HD video only by using one subchannel, or may transmit multiple SD video by using a plurality of subchannels, and may use the same.

In this case, an event information table (EIT) table group having the same source ID (source_id) and an extended text table (ETT) table belonging thereto are stored in the corresponding subchannel region.

For reference, referring to the structure of the PSIP table shown in FIG. 2, in the case of PSIP, a virtual channel table (VCT) for listing a channel type currently being broadcasted; An event information table (EIT-0, EIT-1, ...) to which a source ID of each channel of the VCT is linked; A MGT (Master Guide Table: PID 0x1FFB) including PID information (PID-K to PID-M) for pointing the EIT; A system time table (STT) including current time information; It includes a RRT (Rating Region Table) that contains information about program grade.

In this case, additional information such as a program title or a plot for the EIT is included in an extended text table (ETT) as shown in FIG. 3, and of course, points each ETT (ETT-0 to ETT-2) to the MGT. PID information (PID-X to PID-Z) is included.

Next, the EPG information output unit 5 outputs the EPG information in OSD form whenever a user requests it. The primary channel and the secondary channel belonging to the default are first set by using the database of the PSIP buffer 3. Provides announcements such as broadcast time sequence and title of each time slot. Of course, it is also possible to change the main channel and then display the broadcast order and title of the sub-channel belonging to it.

Hereinafter, the operation and operation of the present invention configured as described above will be described with reference to the flowchart of FIG. 4.

First, the user moves the cursor while viewing the EPG information output in the OSD form, and selects which program (event) to record. The EPG information output unit 5 selects the corresponding main channel at the moment when the scheduled recording (event) is selected. The event ID (event_id: provided by the EIT table) having a unique value in the system is returned to the recording mode and the recording time determining unit 6 so as to know which event is selected (S11).

Accordingly, the recording mode and the recording time determination unit 6 refer to the event ID (event_id) value provided by the EPG information output unit 5 and start time and broadcast time of the event currently selected from the PSIP buffer 4. length_in_second) The end time is read (S12) to calculate the airtime time zone (S13, S14).

In addition, if a subchannel including a selected event (a value should not be 0) or a source ID is read (S15), and only one subchannel or source ID exists in the broadcast time zone of the selected event (S16), the selected channel is selected. The event is determined to be HD video and the recording mode is set to a high resolution (HD) mode (S19).

Otherwise, if there are two or more subchannels or source IDs in the same transmission channel (VCT table), it is determined that a plurality of SD video is transmitted to the physical transmission channel corresponding to the current primary channel, and the recording mode is changed to the standard (SD) mode. (S17).

Next, when the recording mode is determined as described above, the recording mode and recording time determination unit 6 determines whether or not the selected event can be recorded on the current remaining tape amount in the determined recording mode.

The determination method differs depending on the recording mode, but in the high-definition (HD) mode, the recordable time detected by the remaining tape detection unit 2 is compared with the broadcast time of the event as it is, and it is determined whether the remaining tape is larger than the broadcast time (S20). In the standard (SD) mode, the recordable time detected by the tape remaining amount detection unit 2 is multiplied by 2 and the broadcast time of the selected event is compared (S18).

This is because the recordable time detected by the tape remaining amount detection unit 2 detects on the basis of the high resolution (HD) mode.

Next, if the remaining tape is sufficient to record the entire event according to the comparison result, and outputs an OSD signal indicating that normal scheduled recording is possible (S23), if the remaining tape is less than the event airing time to the user the tape Outputs an OSD signal requesting to replace (S22).

At this time, it is possible to simultaneously display through the OSD to compare the broadcast time of the event and the remaining amount (recordable time) of the actual tape, the user's choice whether to replace the tape after generating the replacement request OSD signal If it is not replaced, the selected event is recorded only as long as it can record in the remaining tape.

Accordingly, in the present invention, if several programs are already recorded on the tape, and if another program is scheduled to be recorded continuously, it is possible to immediately know whether the remaining tape remaining can be sufficiently recorded at the time of reservation. It is possible to prevent recording interruption due to lack of remaining capacity.

As described above, the apparatus and method for recording a digital broadcast signal according to the present invention, when pre-recording a digital broadcast program in an EPG environment using PSIP information, automatically determines the video mode and sets the recording mode accordingly. It is effective to use efficiently.

In addition, the present invention compares the program airing time and the remaining tape, if the program to be scheduled recording can not be completely recorded from the beginning to the end, by notifying the user in advance so that the tape can be replaced, recording by insufficient tape remaining Has the effect of not interrupting.

Claims (6)

A cassette deck for inserting a video tape; A remaining tape detection unit determining a recordable time of the tape inserted into the cassette deck; A program and system information protocol (PSIP) information extraction unit for receiving the digital broadcast signal and extracting the PSIP information; A PSIP buffer for storing PSIP information extracted by the PSIP information extracting unit; An EPG information output unit for outputting EPG information in OSD form according to a user's request; Determining a recording mode and a recording time for calculating the broadcast time zone by reading the start time (start_time) and the broadcast time (length_in_second) values of the currently selected event from the PSIP buffer with reference to the event ID (event_id) value provided by the EPG information output unit. And a digital broadcast signal recording apparatus. The method of claim 1, wherein the remaining tape detection unit determines the recordable remaining amount at the current position of the tape, and outputs a recordable time converted based on the HD mode. The apparatus for recording digital broadcast signals, characterized in that configured to output. The EPG information output unit of claim 1, wherein the EPG information output unit outputs a broadcast guide for each time zone of a primary channel and a subchannel belonging to the default channel in OSD format according to a user's request for broadcast guide information, and outputs the EPG information output by the user. The apparatus for recording a digital broadcast signal, characterized in that configured to output an event ID (event_id) for notifying that the program is selected when the program to be scheduled recording is selected in. A first step of outputting an event ID corresponding to a program (event) to be reserved by the user; Detecting a broadcast time for the selected program from PSIP information; Determining a video transmission mode of the selected program and setting a recording mode accordingly; A fourth step of comparing the recordable time by the remaining tape amount with the broadcast time of the detected program to determine whether recording of the entire program is possible with the remaining tape remaining amount; When the recording of the entire program is possible, the recording is made, and if the remaining tape is smaller than the event airing time, the user is notified of the digital broadcasting. How to record a signal. The method of claim 4, wherein the setting of the recording mode of the third step comprises: detecting a subchannel or source ID including the selected event in a broadcast time zone of the selected program (event), and the number of the subchannel or source ID. If the number is one, the video transmission mode of the selected event is determined to be HD level, and the recording mode is set to a high resolution mode. If there are two or more subchannels or source IDs, the video transmission mode of the selected event is And the recording mode is set to the standard mode by determining that it is SD class. The method of claim 4, wherein the determining of whether the entire program can be recorded using the remaining amount of tape in the fourth step comprises comparing the recordable time of the remaining amount of tape with the broadcast time of the event, when the recording mode is a high resolution mode. In the standard mode, digital broadcasting is performed such that the entire program can be recorded when the recordable time is larger than the event airing time by comparing the recording time of the remaining tape with the time multiplied by 2 and the airing time of the event. How to record a signal.