JP4126565B2 - Recording / reproducing method and recording / reproducing apparatus - Google Patents

Description

  The present invention relates to a recording / playback method and a recording / playback apparatus for time-shifting and playing back TV signals and the like while temporarily storing them. At the same time, by inputting the bookmark to another time shift playback device of this type, the recording playback method and the recording playback device can jump to the same desired scene and playback in the other time shift playback device. About.

  As this type of recording / reproducing apparatus (hereinafter also referred to as a time-shift reproducing apparatus), an apparatus disclosed in Japanese Patent Laid-Open No. 7-250305 is known. FIG. 13 shows a block diagram of this type of time-shift playback apparatus. In the figure, a video signal input from an antenna terminal 100 is converted into an analog video signal and an analog audio signal by a tuner 101 and then displayed on a display device 103 via a selection circuit 102. At the same time, the video signal from the tuner 101 is supplied to the compression circuit 104 and the amount of information is compressed. The video signal compressed in this way is supplied to the storage device 105. The video signal temporarily stored in the storage device 105 is time-shifted and read in accordance with a user's request, is expanded in the expansion circuit 106, is displayed on the display device 103 through the selection circuit 102.

  Also, as an additional function of this type of time-shift playback device, the position of a predetermined video and audio is stored as a bookmark with a sense of pinching a book, time-shifted, and jumped directly to that position, A function that can start reproduction of information is known.

By the way, in the conventional time shift reproducing apparatus, the recording medium is managed by a physical address unique to each apparatus. For this reason, even if the same information is recorded in each device, the physical address of the recorded information usually differs depending on each device. That is, even if certain information is stored as a physical address at address 100 in one apparatus, completely different information is normally stored at address 100 of the other apparatus.
Therefore, even if the position of a certain video on the recording medium is set as a bookmark, if this bookmark is associated with a physical address unique to each device, this type of bookmark is stored in another time-shift playback device. It was not available in.
For this reason, a user who owns this type of playback device cannot use a bookmark corresponding to the scene he / she wants to watch as a means of introducing the desired scene to another user who owns another playback device. It was.

    The present invention has been made in view of the above circumstances, and a recording / playback method in which a user can play back recording information similar to that of another person by inputting bookmark information given by another person. And a recording / reproducing apparatus.

  In order to solve the above-mentioned problem, the invention according to claim 1 relates to a recording / reproducing method, wherein the first recording / reproducing apparatus is used to view the first moving image recorded on the first recording medium. Create a bookmark that records the actual recording time of the desired scene, and pass the created bookmark to the second recording / reproducing apparatus that records the actual recording time based on the same absolute time as the first recording / reproducing apparatus. Thereafter, the second video recording / playback apparatus uses the same first video as recorded on the first recording medium among the videos recorded on the second recording medium. When playing back using the bookmark passed from the recording / playback apparatus, the actual recording time associated with the bookmark, and the actual recording time and position information are recorded on the second recording medium, Out of multiple reference moments in The first moving image is obtained by obtaining a physical address of the scene to be viewed on the second recording medium based on the recording actual time and position information of the reference instantaneous scene closest to the recording actual time of the scene to be viewed. It is characterized by accessing or jumping to the scene to be viewed.

  A second aspect of the present invention relates to the recording / reproducing method according to the first aspect, wherein a time code provided for synchronizing video and audio is used as the position information, and the scene to be viewed is the time code. It is characterized by being specified and accessed by adding the time to the above.

  A third aspect of the present invention relates to the recording / reproducing method according to the first aspect, wherein a cumulative bit number is used as the position information, and the scene to be viewed is obtained by multiplying the time by a bit rate. It is characterized by being specified and accessed by adding to the number of bits.

  The invention according to claim 4 relates to a recording / playback apparatus that uses a bookmark to access or jump to a specific scene when playing back a recorded video, and configures the video when recording the video. Storage means for storing the actual recording time and position information of each of a plurality of reference instantaneous scenes separated from each other by a predetermined time among the plurality of instantaneous scenes, and storing the actual recording time of the scene to be viewed in association with the bookmark. A bookmark storage unit for accessing the scene to be viewed, and an access means for accessing the actual recording time of the scene to be viewed and the reference instantaneous scene closest to the actual recording time of the scene to be viewed. Based on the actual recording time and position information, the scene to be viewed is accessed or jumped to be reproduced.

  A fifth aspect of the present invention relates to the recording / reproducing apparatus according to the fourth aspect, wherein a time code provided for synchronizing video and audio is used as the position information, and the access means includes the time code. The scene to be viewed is specified by adding the time.

  A sixth aspect of the present invention relates to the recording / reproducing apparatus according to the fourth aspect, wherein the number of accumulated bits is used as the position information, and the access means uses a value obtained by multiplying the time by a bit rate as the accumulated bits. The scene to be viewed is specified by adding to a number.

  As described above, according to the configuration of the present invention, since the actual recording time (absolute time) of the scene to be viewed is associated with the bookmark, the bookmark is managed as an absolute time. Therefore, the bookmark can be used in devices other than the device that created the bookmark. For this reason, by telling the bookmark created by one viewer to the other viewer, the other viewer can watch the scene that one viewer wants to see, and the one viewer wants to see Can be shared with the other viewer.

  Embodiments of the present invention will be described below with reference to the drawings. The description will be made specifically using examples.

  FIG. 1 is a block diagram showing the configuration of the time shift reproduction apparatus of the present invention, FIG. 2 is a diagram showing the configuration of recording information used in the embodiment, FIG. 3 is a time code used in the embodiment, FIG. 4 is a block diagram showing a configuration of a compression device used in the embodiment, and FIG. 5 is a diagram explaining bookmark transfer.

  As shown in FIG. 1, the time shift reproduction apparatus 1 of this embodiment includes an antenna 2 that receives a television signal, a tuner 3 that demodulates the television signal into an analog video signal and an analog audio signal, and these analog video signals. And an A / D conversion device 4 that converts an analog audio signal into a digital signal, a time measuring unit 5, a compression device 6 that compresses the output signals of the A / D conversion device 4 and the time measuring unit 5, and the compression device 6 A storage device 7 that stores the output of the storage device 7, a decompression device 8 that decompresses the output of the storage device 7, a bookmark management unit 9, an access control unit 10, and a D / A that performs D / A conversion on the output of the decompression device 8. An A converter 11 and an output device 12 that outputs an analog signal output from the D / A converter 11 are configured.

  When recording the moving image, the time measuring unit 5 measures the actual recording time (absolute time) of at least an instantaneous scene during the recording, for example, the time when the compression device 6 starts the compression process (recording start time). Output. The actual recording time measured by the timer unit 5 is stored in the storage device 7. Here, the absolute time is the actual time at that time, and the time measuring unit 5 measures time according to, for example, the following three types of time.

(A) A time zone (time zone) is defined as the local time.
Japan Standard Time (JST) is one example.

(B) Standard time in the world.
Previously, Greenwich Mean Time (GMT) was used, but now Coordinated Universal Time (UTC) is used.

(C) A universal time with no time difference, such as Internet time.
Internet time is used on the Internet as a universal time with no time difference.

  The bookmark management unit 9 includes a bookmark creation unit 13 and a bookmark storage unit 14. The bookmark creation unit 13 creates a bookmark.

  Here, the bookmark functions as a so-called bag that identifies the position of an arbitrary video such as a scene that the viewer has selected and wants to see. In this embodiment, the scene to be viewed is specified by the actual recording time when the scene to be viewed is recorded. That is, in this embodiment, the bookmark is the actual recording time of the scene to be viewed, and at the time of reproduction, the bookmark can be used to jump to the scene to be reproduced for reproduction. Therefore, the bookmark creation unit executes the following expression (1) in order to create the bookmark.

T _N = T ₀ + (SCR _N −SCR ₀ ) (1)
Here, T ₀ is provided at the head of the digital compression code of the video information V and the audio information A as shown in FIG. 2, and indicates a recording start time at which encoding is started.
_TN indicates the actual recording time when the recording of the scene the viewer wants to see is started. The SCR (System Clock Reference) is a time code provided for the purpose of performing synchronous reproduction of the video information V and the audio information A. The time code is position information for specifying the position of the recorded information. As a function.

In particular, SCR ₀ is a time code immediately after the recording start time T ₀ , and SCR _N is a time code corresponding to the scene to be viewed. The bookmark creation unit 13 creates the actual recording time corresponding to the bookmark of the scene to be viewed by starting the calculation when the user operates an operation switch (not shown). That is, the actual recording time _TN of the scene to be viewed can be obtained by calculating the above equation (1). The bookmark storage unit 14 stores the bookmark created by the bookmark creation unit 13.

The access control unit 10 detects the address of the desired scene in order to jump to the desired scene based on the bookmark. The access control unit 10 to create the time code SCR _N corresponding to the desired scene above, a calculation unit 15 for calculating the formula (2), converts the time code to the physical address of the desired scene above And a physical address conversion unit 16 that performs the processing.
SCR _N = SCR ₀ + (T _N −T ₀ ) (2)
The above formula (2) is obtained by converting the above formula (1).
The physical address conversion unit 16 obtains a physical address corresponding to the time code SCR as follows. First, as shown in FIG. 3, a recorded program is generally managed as a file 17. The address of each file 17 is managed by a relative address from the beginning of the file (hereinafter referred to as file pointer P). The file 17 is recorded in a random free area of the recording device 19 for each unit of a certain block 18. The file pointer P is converted into a physical address according to a certain regularity. The time code SCR can be retrieved by sequentially reading and analyzing from the beginning of the file 17, that is, the physical address corresponding to the file pointer P of 0. Therefore, the physical address conversion unit 16, a search of the time code SCR _N, the beginning of the file 17, i.e. sequentially read from the physical address file pointer P corresponds to 0, by analyzing performed. Thus, it is possible to know the corresponding physical address of the time code SCR _N.
Thus, the decompressing device 8 jumps to the scene specified by the bookmark, that is, the so-called desired scene, and executes decompression processing of the compressed information.

  The compression device 6 shown in FIG. 1 compresses the information amount of the digital video signal, the digital audio signal, and the absolute time output from the timepiece output from the A / D conversion device 4, and the absolute time. Are synthesized with these digital video signals or digital audio signals, or output as separate data in which the absolute time and these signals are indexed. The compression algorithm in the compression device 6 corresponds to the MPEG standard which is an international standard. The expansion device 8 reads out the digital compression code recorded in the storage device 7 and performs expansion processing. The expansion device 8 has expansion means corresponding to the compression algorithm of the compression device 6. The recording medium of the storage device 7 corresponds to, for example, a hard disk device, an optical disk device, a memory, or the like.

Next, the configuration of the compression device 6 will be described with reference to FIG.
The compression device 6 includes a video encoding circuit 20, an audio encoding circuit 21, an absolute time encoding circuit 22, and a synthesis circuit 23. The video code circuit 20 is a circuit that compresses a digital video signal, and performs compression processing according to, for example, an MPEG algorithm. The audio encoding circuit 21 is a circuit for compressing a digital audio signal. For example, the audio encoding circuit 21 performs compression processing according to the MPEG algorithm in the same manner as a video signal. The absolute time encoding circuit 22 is a circuit that encodes the absolute time input from the timer unit 5 that measures the absolute time. The synthesizing circuit 23 is a circuit for synthesizing the digital compressed video code, the digital compressed audio code, and the absolute time code. For example, the synthesizing process is performed according to the multiplexing method of the MPEG algorithm in the same manner as the video signal.

Next, the operation of this embodiment will be described with reference to FIG.
The TV signal is received by the antenna 2 and then demodulated into an analog video signal such as an NTSC signal and an analog audio signal by the tuner 3. Then, the viewer records an arbitrary television program from the beginning or the middle of the program on the assumption that the viewer may view it again while viewing the television screen. In this case, the television signal is converted into a digital video signal and audio signal in the A / D conversion device 4, and then the information amount is compressed in the compression device 6. At this time, the compression unit 6 is input with the start time of the compression process, that is, the recording start time, from the time measuring unit 5. This recording start time is compressed in the compression device 6. The digital compression code output from the compression device 6 is recorded in the storage device 7. When the viewer shifts in time and reaches a scene that he / she particularly desires to view again, a so-called desired scene, the operation switch of the bookmark creation unit 13 is operated. Then, the bookmark creation unit 13 creates the actual recording time when the desired scene is recorded as a bookmark, and records this bookmark in the bookmark storage unit 14.

After that, when the user tries to reproduce the image recorded as described above by time-shifting, it jumps to the scene to be seen corresponding to the bookmark and reproduces it.
At this time, the digital compression code read out from the storage device 7 is decompressed by the decompression device 8, converted into an analog video signal and an analog audio signal by the D / A converter 11, and then output to the output device 12. It will be played back.
In the above description, a case has been described in which a bookmark is obtained by the same time-shift playback apparatus 1 and jumps to a scene desired to be viewed corresponding to the bookmark and is played back. Next, a description will be given of a case where the time-shift playback apparatus 1 different from the time-shift playback apparatus 1 that has obtained the bookmark jumps to a scene to be viewed and plays back the bookmark.

First, as shown in FIG. 5, it is assumed that one viewer views a certain program at the same time as recording the same program from the recording start time α by using his / her time-shift playback device 1. It is assumed that the other viewer also starts recording the program from the recording start time β by using this type of separate time-shift playback device 1 by recording reservation, for example. At this time, since both time-shift playback apparatuses 1 are recording the same program, the same absolute time t flows in both time-shift playback apparatuses 1 as indicated by arrows in the figure. . When one viewer shifts in time and reaches a scene that he / she wants to see again, the viewer operates the operation switch of the bookmark creating unit 13. Then, the bookmark creation unit 13 creates the actual recording time _{TN at} that time as a bookmark, and the bookmark storage unit 14 records the actual recording time _TN . Then, this one viewer informs the other viewer of the actual recording time _TN as the bookmark in order to encourage the other viewer to view the desired scene. This bookmark _TN can be transmitted via the Internet, for example. Thereafter, the other viewer inputs the bookmark into the bookmark storage unit 14 of his time shift playback device 1. Then, the access control unit 10 obtains a time code corresponding to the desired scene based on the above equation (2), and jumps to the desired scene and starts reproduction.
In this way, the other viewer can view the same program as the other viewer.
As described above, when transferring a bookmark, the same absolute time t needs to flow in both devices as described above. Therefore, when both the above devices are located in Japan, the absolute time t corresponds to Japan Standard Time (JST). However, for example, when broadcasting in countries around the world, such as the Olympic broadcast, the above-mentioned Coordinated Universal Time (UTC), which does not need to consider the time difference between countries, as the absolute time t, It is necessary to use the Internet time used on the Internet.
In this embodiment, the case where SCR is used as the time code has been described. However, the same effect can be obtained by using PTS (Presentation Time Stamp) as the time code.

Next explained is the second embodiment of the invention.
FIG. 6 is an explanatory diagram for explaining the operation of the second embodiment.
Compared with the first embodiment described above, the feature of this embodiment is that the recording actual time of the recording start point 0, points S, M... The bookmark is at a point obtained with the closest reference point as a reference.
That is, in this embodiment, as shown in FIG. 6, the recording actual time is obtained periodically, for example, every hour, and stored in the storage device together with the video information and the audio information. FIG. 6 shows recording actual times T ₀ , T _S , and T _{M at} the recording start points 0, S, and M. As described above, the points 0, S, and M serve as reference points for obtaining an arbitrary point, for example, the bookmark and time code of the point N. The point 0, the point S, and the point M are selected as the predetermined predetermined screen area, but other points can also be selected.
The bookmark creation unit of the bookmark management unit according to this embodiment calculates the following expression when creating _N recording actual times, that is, bookmark _TN .
T _N = T _M + [SCR _N −SCR _M ] (3)
Here, T _M is the actual recording time at the reference point M. The reference point M is a reference point closest to the point N as shown in FIG. SCR _N indicates the time code of the N point, and SCR _M indicates the time code of the M point. Above _{T M,} SCR _M has the formula (1) in the first embodiment described above, a relationship obtained by replacing the M N of (2).
The bookmark storage unit of the bookmark management unit stores the bookmark _TN .

The access control unit detects the address of the scene to be viewed in order to time-shift based on the bookmark and jump to the scene to be viewed. The calculation unit of the access control unit calculates the time code of N points by calculating the following equation (4) obtained by converting the equation (3) in order to create the time code corresponding to the scene to be viewed. .
_{SCR N = SCR M + (T} N -T M) (4)
Note that the operation of the physical address conversion unit of the access control unit to obtain the physical address from the time code is the same as that in the first embodiment described above, and a description thereof will be omitted.

Next, the operation of this example will be described with reference to FIG.
First, at the time of recording, the recording times of the reference points 0, S, and M are stored together with video information and the like as shown in FIG.
In this state, when creating a bookmark at the point N, the bookmark creating unit calculates the above equation (3). This bookmark is stored in the bookmark storage unit.
Thereafter, when the user reproduces the recorded image by time-shifting, the user jumps to the desired scene corresponding to the bookmark and reproduces it. At this time, the access control unit obtains a time code SCR _N corresponding to the bookmark, and by determining the physical address corresponding to the time code SCR _N, searches the scene to see the. Then, the image information after the desired scene is decompressed by the decompression device, converted into an analog video signal and an analog audio signal by the D / A converter, and then reproduced through the output device. In addition, by telling the other viewer the bookmark _TN created by one viewer, the other viewer can view the scene that one viewer wants to see, and one viewer wants to see The point that the scene can be shared with the other viewer is the same as in the first embodiment, and the description thereof is omitted.
In this embodiment, compared to the first embodiment, recording times of a plurality of points serving as a reference are obtained and stored in advance, and bookmarks at arbitrary points are obtained using the nearest reference point as a reference. , It is possible to reduce as much as possible the error in obtaining the bookmark.

FIG. 7 is a block diagram showing the configuration of the third embodiment of the present invention, and FIG. 8 is a diagram showing the relationship between the cumulative number of bits and the actual recording time in this embodiment.
Compared with the time shift reproduction device 1 of the first embodiment, the time shift reproduction device 30 of this embodiment includes a counter circuit 31, an absolute time code circuit 32, and an index creation unit 33, while a bookmark management unit 34 and The access control unit 35 is different from that of the first embodiment. In addition, the same code | symbol is attached | subjected to the same component as 1st Example, and the description is abbreviate | omitted.

For example, as shown in FIG. 8, the counter circuit 31 counts and outputs the accumulated data amount of recording information from the recording start point 0 to an arbitrary point, for example, the point N, that is, the accumulated bit number. This cumulative bit number has a function as position information for specifying the position of the recorded information.
The absolute time encoding circuit 32 encodes and outputs the absolute time output from the time measuring unit 5.

The indexing unit 33 is indexed to a recording actual time T _N in this regard N and the cumulative number of bits D _N from the recording start point 0 to the point N, as shown in FIG. 8, as index information R Output.
The recording and the real time T _N and the recording actual time T ₀ and the cumulative bit number D _N of the recording start point 0, since it has a relation of the following equation (5), the bookmark creation unit 36 of the bookmark management unit 34 When creating the actual recording time of the N points, that is, the bookmark _TN , the following equation (5) is calculated.
T _N = T ₀ + D _N / BitRate (5)
Here, BitRate indicates the transmission rate of information.
The bookmark storage unit 37 of the bookmark management unit 34 stores the bookmark _TN .
The access control unit 35 detects the address of the scene to be viewed in order to time-shift based on the bookmark _TN and jump to the scene to be viewed. The calculation unit 38 of the access control unit 35 calculates N points by calculating the following equation (6) obtained by converting the equation (5) in order to obtain the cumulative number of bits corresponding to the scene to be viewed during reproduction. determining the number of accumulated bits _{D N.}
D _N = + (T _N −T ₀ ) × BitRate (6)
The physical address conversion unit 39 of the access control unit 35 converts the cumulative number of bits into a physical address as follows. That is, accumulated data D _N of the N points, matching file pointer P as described in the first embodiment. As described in the first embodiment, since the file pointer P and the physical address have a certain relationship, the physical address corresponding to the file pointer P is searched to specify the N-point physical address. The desired scene can be reproduced by jumping to the physical address.

Next, the operation of this embodiment will be described with reference to FIG.
In the figure, point N is the recording start point of the scene you want to see. In this case, in order to create the bookmark _TN at the N point, the bookmark creating unit 36 calculates the above equation (5). This bookmark _TN is stored in the bookmark storage unit 37.
Thereafter, when the recorded image is time-shifted and reproduced, the user jumps to the desired scene corresponding to the bookmark _TN and reproduces it. At this time, the access control unit 35 obtains the cumulative number of bits D _N corresponding to the bookmark T _N, and by determining the physical address corresponding to the cumulative number of bits D _N, to find the desired scene above. Then, the image information after the desired scene is decompressed by the decompression device 8, converted into an analog video signal and an analog audio signal by the D / A conversion device 11, and reproduced through the output device 12. In addition, by telling the other viewer the bookmark _TN created by one viewer, the other viewer can also view the scene that one viewer wants to see, and one viewer wants to see The point that the scene can be shared with the other viewer is the same as in the first embodiment, and the description thereof is omitted.

Next explained is the fourth embodiment of the invention.
FIG. 9 is an explanatory diagram for explaining the operation of the fourth embodiment.
Compared with the third embodiment described above, this embodiment is characterized by the cumulative number of bits from the recording start point 0 to a plurality of points S, M,... Time is obtained in advance and stored as index information R, and a bookmark at an arbitrary point is at a point obtained with the closest reference point as a reference.
That is, in this embodiment, as shown in FIG. 9, the index creation unit obtains index information R periodically, for example, every hour, and stores it in the storage device together with video information and audio information. deep. FIG. 9 shows index information R at the recording start point 0, point S, point M, and point N. As described above, the points 0, S, and M serve as reference points for obtaining an arbitrary point, for example, the accumulated bit number of the point N. The point 0, the point S, and the point M are selected as the predetermined predetermined screen area, but other points can also be selected.

The bookmark creation unit of the bookmark management unit according to this embodiment calculates the following expression when creating _N recording actual times, that is, bookmark _TN .
T _N = T _M + [D _N -D _M ] / BitRate (7)
Here, / BitRate indicates the transmission rate of information. T _M is the actual recording time at the reference point M. The reference point M is a reference point closest to the point N as shown in FIG. Further, D _N denotes the number of accumulated bits from the recording start point 0 to point N, D _M represents the cumulative number of bits from the recording start point 0 to the reference point M.
The bookmark storage unit of the bookmark management unit stores the bookmark _TN .
The access control unit detects the address of the scene to be viewed in order to time-shift based on the bookmark and jump to the scene to be viewed. The arithmetic unit of this access control unit calculates the cumulative bit number of N points by calculating the following equation (8) obtained by converting the above equation (7) in order to create the cumulative bit number corresponding to the scene to be viewed. Ask for.
D _N = D _M + (T _N −T _M ) × BitRate (8)
Note that the operation of the physical address conversion unit of the access control unit to obtain the physical address from the accumulated bit number is the same as that in the third embodiment described above, and a description thereof will be omitted.
In addition, by telling the other viewer the bookmark _TN created by one viewer, the other viewer can view the scene that one viewer wants to see, and one viewer wants to see The point that the scene can be shared with the other viewer is the same as in the first embodiment, and the description thereof is omitted.

Next, the operation of this example will be described with reference to FIG.
First, at the time of recording, the index information of the reference points 0, S, and M is calculated by the index creation unit and stored together with the video information and the like.
In this state, when creating a bookmark at the point N, the bookmark creating unit calculates the above equation (7). This bookmark is stored in the bookmark storage unit.
Thereafter, when the user reproduces the recorded image by time-shifting, the user jumps to the desired scene corresponding to the bookmark and reproduces it. At this time, the access control unit obtains a cumulative number of bits D _N corresponding to the bookmark, and by determining the physical address corresponding to the cumulative number of bits D _N, to find the desired scene above. Then, the image information after the desired scene is decompressed by the decompression device, converted into an analog video signal and an analog audio signal by the D / A converter, and then reproduced through the output device. In addition, by telling the other viewer the bookmark _TN created by one viewer, the other viewer can view the scene that one viewer wants to see, and one viewer wants to see The point that the scene can be shared with the other viewer is the same as in the first embodiment, and the description thereof is omitted.
In this embodiment, compared with the third embodiment, the cumulative number of bits of a plurality of points serving as a reference and the recording time of the points are obtained and stored in advance, and the bookmark at an arbitrary point is the closest Since it is calculated | required on the basis of a reference point, the error at the time of calculating | requiring a bookmark can be reduced as much as possible.

Next explained is the fifth embodiment of the invention.
FIG. 10 is a block diagram showing the configuration of this fifth embodiment, and FIG. 11 is a diagram showing the relationship between the cumulative number of frames and the actual recording time in this embodiment.
The feature of the time shift reproducing device 40 of this embodiment is that, instead of using the cumulative number of bits, the cumulative number of frames is used as compared with the time shift reproducing device 30 of the third embodiment. The same components as those in the third embodiment are denoted by the same reference numerals, and the description thereof is omitted.
The time shift reproduction device 40 of this example uses a code analysis circuit 41 instead of the counter circuit 31 as compared with the time shift reproduction device 30 of the third embodiment.

The code analyzing circuit 41, as shown in FIG. 11, counts the cumulative number of frames F _N recorded information from the recording start point 0 to an arbitrary point N outputs. This cumulative frame number F _N has a function as position information for specifying the position of the recorded information.
The index creation unit 42 indexes the cumulative number of frames from the recording start point 0 to an arbitrary point and the actual recording time at the arbitrary point, and outputs it as index information Q as shown in FIG.
The recording and the real time T _N and the recording actual time T ₀ and the cumulative number of frames F _N of the recording start point 0, since it has a relation of the following equation (9), the bookmark creation unit 44 of the bookmark management unit 43 When creating the actual recording time of the N points, that is, the bookmark _TN , the following equation (9) is calculated.
T _N = T ₀ + F _N / framerate (9)
Here, the frame rate indicates the transmission rate of information.
The bookmark storage unit 45 of the bookmark management unit 43 stores the bookmark _TN .

The access control unit 46 detects the address of the desired scene in order to time-shift based on the bookmark _TN and jump to the desired scene. The calculation unit 47 of the access control unit 46 calculates N points by calculating the following equation (10) obtained by converting the equation (9) in order to obtain the cumulative number of frames corresponding to the scene to be viewed during reproduction. determining the number of frames of the cumulative _{F N.}
F _N = + (T _N −T ₀ ) × framerate (10)
The physical address conversion unit 48 of the access control unit 46 obtains a physical address corresponding to the cumulative number of frames as follows.
That is, the search of the cumulative number of frames F _N of N points, the beginning of the file described in the first embodiment, i.e. with sequentially read from the physical address where the file pointer is equivalent to 0, by counting the number of frames can be realized . In this way, the physical address of the N points is specified, and a scene to be viewed can be reproduced by jumping to this physical address.

Next, the operation of this embodiment will be described with reference to FIG.
In the figure, point N is the recording start point of the scene you want to see. In this case, in order to create the bookmark _TN at the N point, the bookmark creating unit 44 calculates the above equation (9). This bookmark _TN is stored in the bookmark storage unit 45.
After that, when the user plays the recorded image with time shift,
Jump to the scene you want to see that corresponds to the bookmark _TN and play it back. At this time, the access control unit 46 retrieves the scene to be viewed by obtaining the cumulative frame number F _N corresponding to the bookmark T _N and obtaining the physical address corresponding to the cumulative frame number F _N. Then, the image information after the desired scene is decompressed by the decompression device 8, converted into an analog video signal and an analog audio signal by the D / A conversion device 11, and reproduced through the output device 12. In addition, by telling the other viewer the bookmark _TN created by one viewer, the other viewer can also view the scene that one viewer wants to see, and one viewer wants to see The point that the scene can be shared with the other viewer is the same as in the first embodiment, and the description thereof is omitted.

Next explained is the sixth embodiment of the invention.
FIG. 12 is an explanatory diagram for explaining the operation of this embodiment.
Compared with the fifth embodiment described above, this embodiment is characterized by the cumulative number of frames from the recording start point 0 to a plurality of points S, M,... As reference points, and the recording time of each reference point. Is previously determined and stored as index information Q, and a bookmark at an arbitrary point is at a point obtained with the closest reference point as a reference.
That is, in this embodiment, as shown in the figure, the index creation unit obtains index information Q periodically, for example, every hour, and stores it in the storage device together with video information and audio information. deep. In the figure, index information Q at the recording start point 0, the point S, the point M, and the point N is described. As described above, the points 0, S, and M serve as reference points for obtaining an arbitrary point, for example, the accumulated bit number of the point N. The point 0, the point S, and the point M are selected as the predetermined predetermined screen area, but other points can also be selected.

The bookmark creation unit of the bookmark management unit of this embodiment calculates the following formula (11) when creating _N recording actual times, that is, bookmark _TN .
T _N = T _M + [F _N −F _M ] / Framerate (11)
Here, Framerate indicates the transmission rate of information. T _M is the actual recording time at the reference point M. The reference point M is a reference point closest to the point N as shown in FIG. Further, F _N represents the cumulative number of frames from the recording start point 0 to the point N, and F _M represents the cumulative number of frames from the recording start point 0 to the reference point M.
The bookmark storage unit of the bookmark management unit stores the bookmark _TN .
The access control unit detects the address of the scene to be viewed in order to time-shift based on the bookmark and jump to the scene to be viewed. The calculation unit of the access control unit calculates the cumulative number of frames at N points by calculating the following formula (12) obtained by converting the formula (11) in order to create the cumulative number of frames corresponding to the scene to be viewed. Ask for.
F _N = F _M + (T _N −T _M ) × Framerate (12)
Note that the operation of the physical address conversion unit of the access control unit to obtain the physical address from the cumulative number of frames is the same as in the fifth embodiment described above, and therefore the description thereof is omitted.

In addition, by telling the other viewer the bookmark _TN created by one viewer, the other viewer can view the scene that one viewer wants to see, and one viewer wants to see The point that the scene can be shared with the other viewer is the same as in the first embodiment, and the description thereof is omitted.

Next, the operation of this embodiment will be described with reference to FIG.
First, at the time of recording, the index information of the reference points 0, S, and M is calculated by the index creation unit and stored together with the video information and the like.
In this state, when creating a bookmark at the point N, the bookmark creating unit calculates the above equation (11). This bookmark is stored in the bookmark storage unit.
Thereafter, when the user reproduces the recorded image by time-shifting, the user jumps to the desired scene corresponding to the bookmark and reproduces it. At this time, the access control unit searches for the desired scene by obtaining the cumulative frame number F _N corresponding to the bookmark and by obtaining the physical address corresponding to the cumulative frame number F _N. Then, the image information after the desired scene is decompressed by the decompression device, converted into an analog video signal and an analog audio signal by the D / A converter, and reproduced through the output device. In addition, by telling the other viewer the bookmark _TN created by one viewer, the other viewer can view the scene that one viewer wants to see, and one viewer wants to see The point that the scene can be shared with the other viewer is the same as in the first embodiment, and the description thereof is omitted.
In this embodiment, compared with the fifth embodiment, the cumulative number of frames of a plurality of points serving as a reference and the recording time of the points are obtained and stored in advance, and the bookmark at an arbitrary point is the closest Since it is calculated | required on the basis of a reference point, the error at the time of calculating | requiring a bookmark can be reduced as much as possible.

The embodiment of the present invention has been described in detail with reference to the drawings. However, the specific configuration is not limited to this embodiment, and even if there is a design change or the like without departing from the gist of the present invention. Included in the invention. For example, in the above description, the television signal has been described, but a video signal, a DVD, or the like may be used. Further, one television signal may be selected from a plurality of television signals depending on the channel. In this case, any one channel can be selected by including channel information as bookmark information. Furthermore, the moving images may be supplied from a plurality of imaging units that are provided at different positions and image the same object. Also in this case, any one image pickup means can be selected by including information for selecting one image pickup means as the bookmark information.
In the above-described embodiment, the case where the recording start point 0 and the reference points S and M are used as at least a momentary scene during recording has been described. However, the present invention is not limited to these points, and arbitrary points may be used. Can do.

It is a block diagram which shows the structure of 1st Example of this invention. It is a figure which shows the structure of the recording information used for the Example. It is a figure explaining the relationship between the time code used for the Example, and a physical address. It is a block diagram which shows the structure of the compression apparatus used for the Example. It is a figure explaining transfer of the time code of the Example. It is a figure which shows the relationship between the time code of several reference points, and video recording time in 2nd Example of this invention. It is a block diagram which shows the structure of 3rd Example of this invention. It is a figure which shows the relationship between the cumulative number of bits and recording real time in the Example. It is a figure which shows the relationship between the number of accumulation bits and recording real time in 4th Example of this invention. It is a block diagram which shows the structure of 5th Example of this invention. It is a figure which shows the relationship between the number of accumulation frames and recording real time in the Example. It is a figure which shows the relationship between the number of accumulation frames and recording real time in 6th Example of this invention. It is a block diagram which shows the structure of a prior art example.

Explanation of symbols

1, 30, 40 Time-shift playback device 5 Timekeeping unit (timer unit)
7 Storage device (storage means)
10, 35, 46 Access control unit (access means)
14 Bookmark storage

Claims (6)

Using the first recording / playback apparatus, a bookmark is recorded in which the actual recording time of the scene to be viewed in the first moving image recorded on the first recording medium is recorded. After recording the actual recording time based on the same absolute time as that of the first recording / reproducing apparatus, after passing it to the second recording / reproducing apparatus,
In the second recording / playback apparatus,
Of the moving images recorded on the second recording medium, the same first moving image as recorded on the first recording medium is used by using the bookmark passed from the first recording / playback apparatus. When playing,
The actual recording time associated with the bookmark;
Of a plurality of reference moment scenes in the first moving image in which the actual recording time and position information are recorded on the second recording medium, the reference instant scene closest to the actual recording time of the scene to be viewed is selected. Based on the actual recording time and location information,
A recording / reproducing method comprising: accessing or jumping to the scene to be viewed in the first moving image by obtaining a physical address of the scene to be viewed on the second recording medium.   As the position information, a time code provided for synchronizing video and audio is used, and the scene to be viewed is specified and accessed by adding the time to the time code. The recording / reproducing method according to claim 1.   The cumulative number of bits is used as the position information, and the scene to be viewed is specified and accessed by adding a value obtained by multiplying the time by a bit rate to the cumulative number of bits. Item 2. The recording / reproducing method according to Item 1. A recording / playback device that uses a bookmark to access or jump to a specific scene when playing a recorded video,
When recording the moving image, the storage means for storing the actual recording time and position information of each of a plurality of reference instantaneous scenes that are separated from each other by a predetermined time among the plurality of instantaneous scenes constituting the moving image, and to be viewed A bookmark storage unit for storing a recording actual time of a scene in association with the bookmark, and an access unit for accessing the scene to be viewed, the access unit including the recording actual time of the scene to be viewed and the scene to be viewed A recording / playback apparatus for accessing and jumping to the desired scene based on the actual recording time and position information of the reference instantaneous scene closest to the actual recording time.   A time code provided for synchronizing video and audio is used as the position information, and the access means specifies the scene to be viewed by adding the time to the time code. The recording / reproducing apparatus according to claim 4.   The cumulative number of bits is used as the position information, and the access means identifies the scene to be viewed by adding a value obtained by multiplying the time by a bit rate to the cumulative number of bits. Item 5. The recording / reproducing apparatus according to Item 4.

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