JP2000339936A - Method for displaying screen - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable a user to make sure a reproduction point of a program on a screen even if contents of the program when searched for to be reproduced cannot be displayed to the screen. SOLUTION: Program ID information is obtained from a control track when a magnetic tape is reproduced (F101). At the same time, address information as an absolute address on the medium is obtained (F103). A program start address and a program end address corresponding to the program ID information are read out (F105). The present reproduction position is operated based on a record start position and a record end position of the program (F106) and displayed to a screen (F107).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a method for reproducing a program signal recorded on a recording medium, to which position on a magnetic tape currently reproduced corresponds to a position in a program being reproduced. The present invention relates to a screen display method capable of displaying on a screen.

[0002]

2. Description of the Related Art An existing analog video tape recorder (hereinafter, referred to as an analog video tape recorder) for recording a program to be recorded in an analog signal form.
In "analog VTR"), when recording a program signal while forming a plurality of inclined tracks on a recording medium,
The program signal for one field of the recorded program is recorded on one inclined track, and the recording position of the program signal for one field in the inclined track is recorded in association with the screen position in the field screen.

[0003] Therefore, at the time of so-called search reproduction in which a program signal is reproduced at a tape running speed different from that at the time of recording, even if the reproduction head reproduces the program signal over a plurality of tracks, the program content can be confirmed on the screen. It is possible to find out a desired playback location while checking the program content at the current playback location.

[0004]

However, a digital tape recorder (hereinafter, referred to as "digital V") for recording and reproducing signals compressed between frames as in the MPEG system.
TR "), it is difficult to periodically reproduce program signals at all screen positions during search reproduction, so that it is difficult to confirm the contents of the recorded program on the screen.

[0005] In other words, even if the reproducing head reproduces a program signal over a plurality of tracks during search reproduction, it is not possible to periodically reproduce an I picture including all image information in one screen. It is difficult to display the contents of a program.

[0006] Therefore, the user checks the reproduction position in the program being reproduced, such as whether the reproduction position on the magnetic tape where the search reproduction is currently being performed is the beginning or end of the program. In order to find a desired reproduction position, it was necessary to repeat a very complicated operation of temporarily stopping the running of the magnetic tape and then performing normal reproduction.

[0007]

In order to solve the above-mentioned problems, a screen display method according to the present invention is arranged such that a program signal is recorded on an inclined track, and an absolute address indicating an absolute position of a medium is set in a longitudinal direction. When reproducing the program signal from a recording medium recorded on a formed linear track, a screen display method for displaying a current reproduction position on the basis of a recording start position and a recording end position of the program signal on the screen, Obtaining the absolute address from a track; and reading a program start address indicating a recording start position of the program signal and a program end address indicating a recording end position of the program signal from a memory written at the time of recording the program signal. And the recording start position of the program signal using the absolute address, the program start address, and the program end address. A step of computing a current playback position relative to the fine recording end position, is characterized in that a step of screen displaying the calculation result.

[0008] Further, in the screen display method according to the present invention, when the absolute address cannot be obtained from the linear track, the recording start position and the recording end of the program signal are obtained after obtaining the absolute address by arithmetic processing. The present invention is characterized in that a current reproduction position based on the position is calculated, and the calculation result is displayed on a screen.

[0009] In addition, the screen display method according to the present invention includes, using the absolute address and the program start address, calculating a reproduction elapsed time during normal reproduction from the program start position to the current reproduction position; And displaying the playback elapsed time on a screen.

[0010] Also, in the screen display method according to the present invention, there is provided a memory in which a program start address indicating a recording start position of the program signal and a program end address indicating a recording end position of the program signal are written at the time of recording the program signal. And reading a program title corresponding to the program signal from the memory, and displaying the program title on a screen.

[0011] Also, in the screen display method according to the present invention, the program signal is a compressed signal subjected to compression processing between frames, and is used when reproducing the program signal at a medium running speed different from that at the time of recording. And displaying the screen.

[0012] Also, in the screen display method according to the present invention, when the program signal is composed of a plurality of program signals for a plurality of programs, after specifying one program signal in the plurality of program signals, The present invention calculates a current reproduction position based on a recording start position and a recording end position of one program signal, and displays the calculation result on a screen.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A screen display method according to the present invention is characterized in that, when a program signal recorded on a recording medium is reproduced, a reproduction position on a magnetic tape currently being reproduced is determined by the reproduction position of the program being reproduced. This is a screen display method capable of displaying on a screen whether the position corresponds to a position. The details will be described below with reference to the drawings.

First, a recording pattern of a signal recorded on a magnetic tape by a digital VTR will be described with reference to FIG.
This will be described with reference to FIG. In the figure, T1 to T9 are inclined tracks formed on a magnetic tape 10 by a rotary head during signal recording, and 11 is a magnetic tape 1 by a fixed head.
0 is a control track formed in the longitudinal direction.

[0015] When the magnetic tape 10 is moved from the right hand direction to the left hand direction in FIG.
The video and audio signals compressed by the MPEG method are sequentially recorded on each inclined track while being formed one by one, and the control signal is recorded on the control track 11 once every two inclined tracks.

Here, a margin area 12, a subcode area 13, a main data area 14, and a margin area 15 are provided in each inclined track, respectively, and the compressed video and audio signals are in a predetermined packet form. The tracks are arranged in the main data area 14 along the longitudinal direction of the track.

FIG. 2 shows a control signal recorded on the control track 11, in which the duty ratio of the control signal recorded over two inclined track periods is recorded as 60:40 for the N pole to the S pole. When the case is recorded as a value of 0, and when recorded as 30:70 with N poles vs. S poles as a value of 1, a control signal is recorded with one of the duty ratios. The tape running speed is determined based on the timing at which the control signal changes from the S-pole to the N-pole, that is, the timing of the rising edge shown in FIG.

FIG. 3 shows library information to be written on the control track 11 using the control signal indicating the value of 0 or 1 as described above. The library information includes a header area, a user data area, and a time code area. As one cycle, one library information is formed by four cycles.

That is, device ID information and address information are recorded in the user data area and the time code area following the header 1, and tape ID 1 information and address information are recorded in the user data area and the time code area following the header 2. In the user data area and the time code area following the header 3, the tape ID 2 information and the address information are recorded, and in the user data area and the time code area following the header 4, the program ID information and the address information are recorded.

It should be noted that the device ID information is different from the identification information, the tape ID1 information and the tape ID2 information assigned to each digital VTR so that the device that has recorded the signal can be specified. The identification information and the program ID information to which a value is assigned are identification information to which a different value is assigned to each program as information unique to the recorded program, and the device ID information, the tape ID1 information, the tape ID2 information, and the program ID information are , Each consisting of 16 bits of information.

On the other hand, the address information is recorded in 19 bits by converting the tape travel distance (absolute position on the magnetic tape 10) from the head of the magnetic tape 10 into time information when recording the signal on the magnetic tape 10. Even when the digital VTR can record signals at a plurality of different tape running speeds, such as a high image quality mode, a standard mode, an economy mode, etc., the address information includes the tape running distance from the head of the magnetic tape 10. The same time information corresponding to the time is recorded.

That is, when recording is performed using a magnetic tape capable of recording for 60 minutes in the high image quality mode, for 120 minutes in the standard mode, and for 180 minutes in the economy mode, an intermediate portion of the magnetic tape is recorded in any of the modes. Is 1800 (a value obtained by converting 30 minutes, which is the recording time in the high-quality mode, into seconds), and 3600 (60, which is the recording time in the high-quality mode).
Minutes converted to seconds).

Here, the time information corresponding to the tape travel distance recorded as the address information is used when the digital VTR runs the magnetic tape 10 to record a signal. The time information is calculated based on the number of rotations and the number of rotations of the reel around which the magnetic tape 10 is wound. Needless to say, the time information may be calculated using other methods.

Further, such device ID information, tape ID 1
A digital VTR in which information, tape ID 2 information, program ID information, and address information are recorded on the control track 11 of the magnetic tape 10 stores a part of the information in its own internal memory.

That is, as shown in FIG. 4, when program 1, program 2 and program 3 are recorded on the magnetic tape 10, the device ID information, the tape ID 1 information and the tape ID
2 information, program ID information of program 1, start and end address information of program 1, program ID information of program 2, start and end address information of program 2, program ID information of program 3, start and end of program 3 Store all address information.

Next, the operation of reproducing a signal from the magnetic tape 10 on which such information is recorded by using a digital VTR at a tape running speed different from that at the time of recording will be described. When the user inserts the video cassette into the digital VTR, the digital VTR runs the magnetic tape 10 a predetermined distance, reads library information from the control track, and checks the library information against the information stored in its own memory.

When the user gives a search / reproduction instruction by a button arranged on the main body of the digital VTR or some remote control, the magnetic tape 10 is controlled to run at a speed different from that at the time of recording. Although no video is displayed, a screen is displayed to indicate where the playback location on the magnetic tape 10 currently performing the search reproduction corresponds to in the program being searched and reproduced.

FIG. 5 is a flow chart for explaining the screen display method at that time. When search playback (fast forward or rewind playback) is started by F100, the digital VTR controls the control track of the magnetic tape 10 by F101. 1
1 to obtain program ID information based on the library information reproduced. At this point, the device ID information, tape ID1 information, and tape ID2 information have already been acquired.

Here, it is conceivable that the program ID information is normally obtained and the program ID information is not normally obtained. If the program ID information is normally obtained, the process proceeds to Y and the magnetic tape 10
It is confirmed whether or not the program ID information obtained from is present in the internal memory in the digital VTR (F102). If the program ID information obtained from the magnetic tape 10 does not exist in the internal memory, the process proceeds to N. If there is, the program ID information is determined and the process proceeds to Y.

When the program ID information is determined, the address information is obtained next (F103), and thereafter the program start and end address information corresponding to the determined program ID information is read from the internal memory (F105). Here, when the address information is not normally obtained, as described above, after the address information is calculated based on the rotation speed of the rotating drum and the rotation speed of the reel around which the magnetic tape 10 is wound, ( F10
4) The program start and end address information corresponding to the program ID information is read.

In this way, when the address information of the reproduction location on the magnetic tape 10 currently performing the search reproduction and the program start and end address information of the program recorded in the reproduction location are obtained, the following calculation is performed. Is performed (F10
6). Bar = {(Ca-Sa) / (Ea-Sa)} × 100
[%]

Here, Ca is the address information of the reproduction position on the magnetic tape 10 currently performing the search reproduction, Sa is the program start address information of the program recorded in the reproduction position, Ea
Is the program end address information of the program recorded at the playback location, and a value Bar indicating the current playback location as a percentage with the entire program at the playback location being 100% is obtained by such an operation.

In F106, a value Time indicating in minutes how long the playback location has elapsed from the start position of the program is also calculated as follows. Time = (Ca-Sa) × n / 60 [minutes]

Here, n is a value corresponding to the recording mode at the time of recording of the digital VTR, and n = 1 when recording in the high-quality mode described above, and n = 2 when recording in the standard mode. , When recording in the economy mode, n = 3.

For example, when the program 2 shown in FIG. 4 is searched and reproduced, the address information of the reproduction location is 1650, and the recording mode is the standard mode, Ca is 1650, Sa is 1200, and Ea Is 210
Since 0 and n are 2, the value Bar is ｛(1650-12).
00) / (2100-1200)｝ × 100 = 50, and the value Time is (1650-1200) × 2/60 =
Fifteen. In this way, the current playback location is program 2
It is clear that the position is 50% from the start of the program 2 and 15 minutes after the start of the program 2.

Then, these information are displayed on the screen in F107. FIG. 6 shows an example of a screen display. As shown in FIG. 6, a program title of a program currently searched for and reproduced, a position display bar based on the value Bar, a value Time
The elapsed time from the program start portion based on the program is displayed. The program title is information held by the digital VTR in association with the program ID information, and the program title of the program at the current playback position is read from the internal memory and displayed.

When such a screen display is completed, it is checked whether or not the search reproduction has been completed in F115, and the process is resumed from the acquisition of the program ID information in F101, and the processing in F10
The contents of the screen display are updated each time the processing of step 7 is performed. If the program ID information cannot be normally obtained in F101, the process proceeds to N, and the address information is obtained from the magnetic tape 10 as in the process in F103 (F108).

When the address information is normally obtained, it is checked whether there is program ID information corresponding to the address information by referring to the internal memory in the digital VTR (F110). If the address information cannot be obtained normally, the address information is calculated based on the number of rotations of the rotating drum and the number of rotations of the reel around which the magnetic tape 10 is wound in the same manner as in F104, and then the corresponding address information is obtained. It is checked whether there is any program ID information that has been changed (F11).
0).

When the address information is obtained from the magnetic tape 10 as described above, the address information reproduced from the magnetic tape 10 is used instead of the address information obtained by calculation. It is needless to say that the use of the address information makes it possible to more accurately display the current position on the screen.

That is, the start and end address information of the program stored in the internal memory of the digital VTR,
The address information recorded on the magnetic tape 10 is calculated based on the rotation speed of the rotating drum and the rotation speed of the reel when the program is recorded.
If the address information is reproduced from 0, it is possible to display the current position on the screen more accurately by using the address information generated at the time of recording the program.

If there is program ID information corresponding to the address information, the process proceeds to Y, and after determining the program ID information (F111), the program start and end address information corresponding to the program ID information in F105 is read. . Also,
In F102 and F110, if the program ID information corresponding to the obtained address information does not exist in the internal memory of the digital VTR, it is confirmed whether or not the search reproduction has been completed (F112 and F113). When the search is over, the screen display is finished (F114). When the search reproduction is not over, the process from F101 is repeated. It is controlled so that the screen display is not performed in the program non-recording portion as shown in FIG.

As described above, at the time of search reproduction, although the video is not displayed on the screen, the position display bar indicating the current reproduction position, the elapsed time from the start of the program, and the program title are displayed. For example, when the user wants to watch only the last 15 minutes of a 60-minute program, the user can perform search playback to a place where the user wants to play back and shift to normal playback.

[0043]

According to the screen display method of the present invention, the program start address and the program end address corresponding to the program signal are written in the memory in advance, and when the program signal is reproduced from the recording medium, Using the absolute address obtained from the linear track of the recording medium and the program start address and program end address written in the memory, the current position based on the program start position and the program end position is displayed on the screen. This has the effect that the user can check on the screen which part of the program is being reproduced.

[Brief description of the drawings]

FIG. 1 is a diagram showing a recording pattern of a signal recorded on a magnetic tape by a digital VTR.

FIG. 2 is a diagram showing a control signal recorded on a control track.

FIG. 3 is a diagram showing library information recorded on a control track using a control signal.

FIG. 4 is a diagram for explaining a program start address and a program end address.

FIG. 5 is a flowchart for explaining a screen display method according to the present invention.

FIG. 6 is a diagram showing an example of a screen display.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... Magnetic tape 11 ... Control track 12 ... Margin area 13 ... Subcode area 14 ... Main data area 15 ... Margin area

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) G11B 27/34 H

Claims (6)

[Claims] When reproducing a program signal from a recording medium on which a program signal is recorded on a linear track formed by recording a program signal on an inclined track and an absolute address indicating an absolute position of the medium in a longitudinal direction, the program signal is recorded. A screen display method for displaying a current reproduction position on the basis of a signal recording start position and a recording end position on a screen, the method comprising: obtaining the absolute address from the linear track; and starting a program indicating a recording start position of the program signal. Reading an address and a program end address indicating a recording end position of the program signal from a memory written at the time of recording the program signal; and using the absolute address, the program start address, and the program end address, Calculating a current playback position based on a recording start position and a recording end position; Screen display method characterized by a step of screen display of the results. 2. If the absolute address cannot be obtained from the linear track, the absolute address is obtained by arithmetic processing, and then the current reproduction position based on the recording start position and the recording end position of the program signal is determined. The method according to claim 1, wherein the calculation is performed, and the calculation result is displayed on a screen. 3. A step of calculating a playback elapsed time during a normal playback from the program start position to the current playback position using the absolute address and the program start address; and displaying the playback elapsed time on a screen. 3. The screen display method according to claim 1, further comprising: A program start address indicating a recording start position of the program signal and a program end address indicating a recording end position of the program signal are read from a memory written at the time of recording the program signal, and the program is read from the memory. 4. The screen display method according to claim 1, further comprising: reading a program title corresponding to the signal; and displaying the program title on a screen. 5. The program signal is a compressed signal that has been subjected to compression processing between frames, and performs the screen display when reproducing the program signal at a medium running speed different from that at the time of recording. The screen display method according to any one of claims 1 to 4, wherein 6. When the program signal is composed of a plurality of program signals for a plurality of programs, after specifying one program signal in the plurality of program signals, a recording start position of the one program signal and 6. The screen display method according to claim 1, wherein a current reproduction position based on a recording end position is calculated, and the calculation result is displayed on a screen.