KR0186211B1 - Index record search method in digital vcr - Google Patents

Abstract

The present invention relates to an index recording and searching method of a DVCR related to an efficient index recording and searching method of a program recorded on a cassette tape in a digital magnetic recording medium of a DVCR.

The conventional index processing method only records program number and program title information in the index data, and works well when recording only once on the cassette tape by allocating a fixed data size to the program title, but the program is already used for the entire area. When another program is recorded on the cassette tape on which the data is recorded, a problem arises in that the index search is not operated by the newly recorded program.

Accordingly, in the index recording and searching method of DVCR according to the present invention, when a plurality of programs are recorded on one cassette tape, the title and location information in the cassette tape are given to each program, and this information is shown to the user to select and search a program. There is an effect that can be modified, such as the title.

Description

Index recording and search method of digital CR

1 is a block diagram of an apparatus for processing an index of a DVCR according to the prior art

2 is a diagram of a program search according to the prior art.

3 is a diagram of a format of index data according to the prior art.

4 is a diagram of a format of index data according to the present invention.

5 is a diagram illustrating an embodiment of a format of index data according to the present invention.

6 is a flowchart of an index recording mode according to the present invention.

7 is a flowchart of the index search mode according to the present invention.

The present invention relates to an efficient index recording and search method of a program recorded on a cassette tape in a digital magnetic recording medium of a DVCR. In particular, when a plurality of programs are recorded on one cassette tape, the title and position information in the cassette tape are recorded in each program. It provides a method of indexing and searching DVCR that can be assigned to and displayed to the user so as to select a program to be searched, modify a title, and go to the beginning of the selected program.

Hereinafter, an index processing apparatus and a search method of a DVCR according to the prior art will be described with reference to the accompanying drawings.

FIG. 1 is a block diagram of an index processing apparatus of a DVCR according to the prior art. The memory unit 11 stores index data, and when the DVCR is in a recording mode, the memory unit 11 reads and reproduces index data. In the mode, the memory control unit 12 receives the index data and stores the data in the memory unit 11, and when the DVCR is in the recording mode, it generates and transmits an appropriate program number signal. A program number generator 13 for reading a number signal, and an index recorder 14 for recording the index data received from the memory controller 12 and the program number signal received from the program number generator 13 on a cassette tape; And an index reproducing unit 15 for reading index data from a cassette tape and transmitting the index data to the memory control unit 12, and a program search. In the mode, the memory control unit 12 reads the index data and the program number from the microcomputer 16 and outputs the data to the screen to change the title of the program or perform a search operation of a desired program according to a user's key input. OSD 17 to be configured.

The conventional DVCR index processing apparatus configured as described above comprises an index data recording mode when the cassette tape is ejected, an index data reproduction mode when the cassette tape is inserted, and a program search mode when the user wants to search or change the title.

In the index recording mode, first, the cassette tape is rewound up to the first part through the system control unit, and the index data stored in the memory unit 11 is transferred to the index recording unit 14 through the memory control unit 12 to transfer the cassette tape. To record.

In the reproducing mode, the index reproducing section 15 reads the index data from the cassette tape and stores the index data through the memory control section 12 to the memory section 11.

In the program search mode, the program title correction and program search operation are performed by reading the index data stored in the memory unit 11 and the PN signal reproduced from the cassette tape from the microcomputer 16.

In addition, three types of data such as index data, a program number (PN), and a Viss signal are recorded and reproduced on a cassette tape for searching for a program recorded on a cassette tape in a digital magnetic recording medium according to the prior art. Search the program using.

The index data is data recorded at the beginning of the cassette tape and composed of the title of each program and the PN signal.

When removing the cassette tape from the DVCR, always rewind to the beginning of the cassette tape, and then write the index data stored in the memory to the beginning of the cassette tape.

When inserting a cassette tape into a DVCR, index data recorded at the beginning of the cassette tape is read.

In addition, the PN signal for the program is recorded over the entire track in which the program is recorded in an area where the digital bit string is not recorded in the video track.

Since the PN signal indicates a program at the current tape position, it is used as a reference signal for calculating the number of programs to be skipped when searching for an arbitrary program.

In addition, at the beginning of each program recording, a Viss signal is recorded in the control track.

The Viss signal is used to find the beginning of the program at the time of search.

Referring to FIG. 2 when searching for a program using the Viss signal, the number of Viss signals to be skipped is calculated to see a program having a PN of 7 when the current PN is 3 on a cassette tape in which 8 programs are recorded. If the number is transmitted to the microcomputer 16, four Viss signals can be detected and fast forwarded.

As shown in FIG. 3, the content of the index data includes only a PN (Program Number) and a program title (program_title) for the corresponding program number.

Program numbers are 1, 2, 3,…. … It is recorded in the following order, and the fixed title size is assigned to the program title.

The conventional technology configured as described above only records program number and program title information in the index data, and works well when recording only once on the cassette tape by allocating a fixed data size to the program title. When another program is recorded on a cassette tape on which programs are recorded, a problem arises in that the index search does not operate by the newly recorded program.

In addition, since a fixed data size is assigned to the program title, an unused area is generated when the amount of data in the program title is small, and when the data amount of the program title is large, the title cannot be recorded. .

The present invention has been made to solve the problems according to the prior art as described above, index search operation is possible even when recording another program on the cassette tape has already been recorded over the entire area and the program title of variable length An object of the present invention is to provide an index recording and search method of digital CR (DVCR).

A feature of the DVCR index recording method according to the present invention for achieving the above object is a first step of formatting the index data into a program number, a next program number, a program title length, a program title, and a program to be newly recorded in the middle of the tape. The second step of increasing the number of and recording the program start information, and the third step of recording the program and the newly recorded program number on the tape by modifying the next program number for the current program to the new program number to record It is done.

In addition, a feature of the DVCR index search method according to the present invention is the first step of reading the program number of the index data and outputting it to the screen, determining the program title length and reading the program title to the screen, and the next program number is the next program. If there is a next program, repeat the first step if there is a next program, and if there is no next program, input the program number to go to and calculate the number of search direction and program start information to skip using the next program number. The second step is to find the beginning.

Hereinafter, the index and search method of the DVCR according to the present invention with reference to the accompanying drawings in detail as follows.

First, as shown in FIGS. 4 and 5, even when recording other programs on a cassette tape in which programs are already recorded over the entire area, an accurate index search can be performed, and the index according to the present invention can efficiently record program titles. The format of data consists of a program number (program_number), a next program number (next_program_number), a program title (program_title), and a program title length (program_title_length).

When another program is recorded in the middle of the already recorded tape, the next_program_number, which is information about a program following the current program for recording information about the order in which the programs are recorded, is recorded for each program of the index data. Contains a code (EMPTY) indicating that there is no next program.

Therefore, the next_program_number has an increased value than the current program number or has an EMPTY code.

The program title is of variable length, and the length of the program title is recorded in the program_title_length for each program of index data.

The program_number is a unique number assigned to each program and this number is recorded together with the program over the entire tape area in which the program is recorded.

An embodiment of the index data format configured as described above is shown in FIG.

5 shows the recording contents of index data in a situation where another program is recorded again in the middle of a tape which has already been recorded.

That is, on a tape on which programs 1, 2, 3, and 4 have already been recorded, 5 programs are recorded from the middle of the recording area of program 2, then program 4 and then program 6 are recorded.

The program number (program_number) is allocated in order, and the content of next_program_number indicates the positional relationship between programs according to the above state.

In more detail, first, as program 5 is recorded, the next_program_number value for program 2 is changed from program 3 to program 5.

When program 5 is completed, next_program_number value for program 5 indicates program 3, the next program after program 5.

Therefore, the recording order of the program is from 1-2-3-4 to 1-2-5-3-4.

After the 6th program is started, the next_program_number value of the 4th program is changed to indicate the 6th program in EMPTY (e.g. 0) .If the 6th program is completed, there is no program after 6th. The next_program_number value of program 6 is changed to indicate EMPTY.

Therefore, the recording order of the final program is 1-2-5-3-4-6, and this order relation can be found at any time by finding all next_program_numbers in the index data.

An index writing process and an index search process in the index data format configured as described above will be described with reference to the flowcharts of FIGS. 6 and 7.

First, when the index recording mode is described, the program number New_PN assigned to the program to be newly recorded is increased by 1 (S601), and program start information (Viss signal) is recorded in the control track portion (S602).

The next_program_number of the program of the current tape position in the index data format is modified to New_PN, which is a program number assigned to the program to be recorded (S603), so that the next program of the current program can be recognized during index search.

After checking whether the tape area to be recorded is a blank area where the program is not recorded (S604) (S605), if the blank area is blank, the program and New-PN are recorded on the tape until the stop button is pressed (S606). When pressed, the next_program_number for the recorded program is modified to EMPTY and ends (S607) (S608).

In addition, if it is not a blank area in step S605, the program and New-PN are recorded before the stop button is pressed (S609), and then it is determined whether start information of another program is detected during recording (S610).

If the start information of another program is detected as a result of the determination, the program start information is deleted (S611), and the program start information detection flag PN_detected_flag is set in the recording process (S612).

The reason for deleting the start information of the program detected in step S611 is that the program start information detected in the recording process is no longer valid since the already recorded program is erased during the recording process.

If the stop button is pressed after the PN_detected_flag setting (S613), the next_program_number of the program recorded by the program whose recording is completed is corrected to the program number of the current tape position (S614).

In step S612, it is determined whether PN_detected_flag is set (S615), and if set, program start information is recorded in the current position of the tape (S616).

This is to reposition the program start information since the program already recorded by the program to be recorded is erased.

Meanwhile, the index search mode is first read with reference to FIG. 7 to output the program_number on the screen (S701), and the length of program_title is determined by reading program_title_length in order to support a variable-length program title (S702) (S703).

In operation S704, it is determined whether next_program_number is EMPTY, and if there is no next program, an index function is performed by user input (S705).

If the editing mode is selected by the user input, program_title is edited (S706). When the search mode is selected by the user input, the program number to be searched by the user is input (S707). After calculating the number of start information (S708), the search information is transmitted to the VCR control microcomputer (S709).

As described above, in the DVCR index recording and searching method according to the present invention, when multiple programs are recorded on one cassette tape, the title and the location information in the cassette tape are given to each program and the user is shown and searched. It is effective to select the program and modify the title.

Claims (3)

A first step of allocating to increase at least one program number corresponding to a program to be recorded, a second step of modifying an index memory with a program number of the program to be recorded, the next program number for a currently recorded program; And recording the program to be recorded, the assigned program number, and program start information on a recording medium in three steps. The method of claim 1, wherein in the third step, it is determined whether the recording medium of the portion to be recorded is a blank area or an already recorded area. And deleting the start information of the detected program, and correcting the next program number of the program recorded in the index memory to the next program number of the program recorded on the recording medium. The first step of reading the program number of the index data and outputting it to the screen, determining the program title length and reading the program title and outputting it to the screen, and if the next program number indicates that there is no next program, the first program if there is a next program The second step is to repeat the steps and if there is no next program, enter the program number to be searched and calculate the number of program start information to be searched and skipped using the next program number to find the beginning of the selected program. Index search method of digital CR (DVCR).