JPH02237377A - Time compression recording method of video data signal and its time expansion playback device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a recording method for temporally compressing and recording a video data signal, and an apparatus for temporally decompressing and reproducing the video data signal.

2. Description of the Related Art Conventional video signal recording and reproducing devices record and reproduce only video data for the same length of time as the recording time of the medium. For example, to record 100 still images of 1 minute each, a recording medium of 100 minutes is required. Furthermore, even in playback devices that have a frame memory, data is simply output from the frame memory in order to wait for the next access.

Problems to be Solved by the Invention However, the above-mentioned configuration has a problem in that the reproduction time cannot be longer than the recording time of the medium.

SUMMARY OF THE INVENTION In view of the above, an object of the present invention is to provide a time compression recording method and a time expansion playback apparatus for a video data signal having a playback time longer than the recording time of a medium.

Means for Solving the Problems The invention of claim 1 of the present application provides a synchronization signal indicating that control information is recorded in a specific section of a video signal, and a video data signal in a frame memory in which a playback device stores the video data signal. video data separated into predetermined time units together with control information to send, control information to continue playing the same video signal section, and control information about the length of time from the current video signal section to the time when the next video signal section is played. The present invention is characterized in that different video data signals are recorded for each signal section unit.

The invention of claim 2 of the present application also provides means for separating a synchronization signal of a time-compressed input video signal, means for separating a vertical synchronization signal from the separated synchronization signal, and control information from the separated synchronization signal. means for detecting a specific section in which the video signal is recorded; and means for separating the data signal from the video signal;
means for capturing a control information part from a data signal separated based on a specific section detection output signal; means for detecting a control information synchronization signal from the data of the read control information part; and a synchronization signal detection output signal. detection means for detecting the playback information of the same section and the time information up to the next section from among the control information based on the control information, and the input video signal based on the vertical synchronization signal and the control information detected by the previous detection means. At the same time, if the reproduction information of the same section is obtained, the section should be reproduced continuously until the time set by the time information up to the next section and reproduced as the original video signal. The invention is characterized by comprising a control means for outputting.

In this manner, the present invention records the same video data signal only once when recording the same video data signal continuously, and stores the control information of the command for reproducing the same section in the control information section. The recording time of the video data signal is compressed by recording control information for reproducing the same video data up to the next interval. When the signal is played back, the video data signal and control information section are detected and the recorded commands are executed to restore the original continuous video data signal and make the playback time longer than the original recorded time. I have to.

Furthermore, if frame memory transfer information is recorded, data can be transferred to the frame memory and output from the frame memory instead of being reproduced from the medium. In this way, a playback time longer than the recording time is achieved using the same recording medium.

Embodiment FIG. 1 shows a recording format of control information in an embodiment of the present invention. In FIG. 1, a is a synchronization signal indicating recording of control information, b is control information for a command to transfer a video data signal to the frame memory, C is control information for a command to continue playing the same video signal section, and d is the current This indicates control information for the length of time from one video signal section to the next video signal section. The contents of these control information sections are recorded in a video data signal of a specific section, for example, in a data signal section of a video signal such as one frame, a non-display section at the beginning of image data, a synchronization signal section, etc.

FIG. 2 shows a block diagram of the playback device of this embodiment. 1
is an input video signal, 2 is a circuit that separates the synchronization signal of video signal 1, 3 is a circuit that separates a vertical synchronization signal from the separated synchronization signal, and 4 is a circuit in which control information is recorded from the separated synchronization signal. A circuit for detecting a specific section, 5 a circuit for separating a data signal from the video signal 1, e a circuit for taking in a control information part from the separated data signal based on the specific section detection output signal, and 7 a read signal. This is a circuit that detects a synchronization signal of control information from data in the control information section. 11, 12. 13 is a circuit that detects a specific command from control information based on the synchronization signal detection output signal, 11 is a detection unit that detects information transferred to the frame memory, and 12 is a circuit that detects playback information in the same section. Detection part, work 3
is a detection unit that detects time information up to the next section. 8 is a frame memory circuit that stores separated data signals;
9 is a data signal switching circuit for selecting the separated data signal and the data signal from the frame memory circuit 8; 1;
0 receives the selected output video data signal, 14 receives the vertical synchronization signal, transfer information to the frame memory, reproduction information of the same section, and time information until the next section, and controls the frame memory circuit and data signal switching circuit. A command control section 15 outputs an output and a control command to the drive device, and 15 is a control command output signal to the drive device.

The operation of the video data signal time compression recording method and time expansion playback apparatus of this embodiment constructed as described above will be explained below.

When the video signal in which the control information is recorded is reproduced, the video signal is input to the video signal 1 in FIG. 2, and the synchronization signal of the video signal is detected in the synchronization signal separation circuit 2.

When this synchronization signal is detected, the position of a predetermined specific section recorded in the data signal portion of the video signal, such as a non-display section at the beginning of a frame or image data, or a synchronization signal section, is detected. On the other hand, in the data signal separation circuit 5, a data signal is separated from the input video signal 1.

Based on the output of the specific section detection circuit 4, data in the control information section is fetched from this data by the control information fetching circuit 6. The synchronization signal shown in FIG. 1a is detected from the data in this information section by the control information section synchronization signal detection circuit 7. Based on this detection signal, among the output data of the control information section import circuit 6, each control information of frame memory transfer control information b1, same section reproduction control information 01, time control information up to the next section d in FIG. It is read by the memory transfer information detection section 11, the same section reproduction information detection section 12, and the time information detection section 13 until the next section.

FIG. 4 is a flowchart showing the operation of the control unit 14 according to the instructions shown in FIG. First, in FIG. 4(a), the transfer information N to the frame memory circuit 8 is checked.

If there is information, a frame memory import command is given to the frame memory circuit 8 of FIG. 2 in FIG. 4(b). Thereafter, in FIG. 4(c), a command to switch to reproduction from the frame memory is given to the data signal switching circuit 9 in FIG. 2. Next, in FIG. 4(d), the reproduction information of the same section is checked. If there is information on reproduction of the same section, a reproduction command from the medium is given to the data signal switching circuit 9 of FIG. 2 in FIG. 4(e). Next,
In FIG. 4(f), time information up to the next section is checked. If there is information, the time information is set internally in FIG. 4(g).

Thereafter, the reproduction information of the same section is checked in FIG. 4(h), and if there is no information, the process proceeds to FIG. 4(j). Here, a temporary stop command is given through a control command output signal to the drive device shown in FIG. During this time, the count is counted up to the time information set in FIG. 4(j). When the count ends, a regeneration command is given to the drive device in FIG. 4(k). In the command control unit 14 of FIG. 2, (
Continue going through the flow of a), (d), and (f).

In FIG. 4(d), when a command to reproduce the same section is received, instead of reproducing the same section from the medium, the video data signal of that section is taken into the frame memory and the video data signal is sent out from the frame memory. It is also possible to issue instructions to do so. In addition, in a reproducing apparatus that does not have a frame memory, when a command to transfer a video data signal to the frame memory is received, a command to continue reproducing the same section is issued. Also, when counting up to the time information shown in Figure 4 (j), if you manage the time using the vertical synchronization signal included in the video signal, it is possible to count with 1/3o second accuracy and send a measurement end command. Ru.

FIG. 3 shows an example of arrangement of video data signals and an example of control information. FIG. 3(a) shows a configuration in which a normal video data signal before processing is played back in the order of frames v1 to v7 in chronological order, and FIG. 3(b) shows a configuration in which video data recorded by time compression is A configuration in which v1 to v7 are arranged in this order is shown. An example of the content of the control information in FIG. 3(b) is shown below. O in the frame memory transfer information indicates that the video data transfer command to the frame memory is not set, and 1 indicates that it is set. Further, O in the same section reproduction information indicates that no instruction to reproduce the same section is set, and 1, 2, . . . indicate that the same section is to be reproduced in 1, 2, .

Also, 1 in the time information until the next section is time information from the current video signal section to the next video signal section, meaning playback between one frame, and 2, 3, 4, etc. indicate the respective sections. This means that the reproduction continues for 2 frame, 3 frame, and 4 frame sections. When the control information is written as shown in FIG. 3(b), first, v1 and v2 are played back for one frame each, and then v3, v4, and v5 are played back for 3 frames, 4 frames, and 2 frames, respectively. Play for a while.

At that time, what is the playback device doing with the frame memory?
It is also possible to transfer video data to the frame memory for one frame each of v3, v4, and v5, and output the video data from the frame memory for each frame. When outputting from frame memory, there is an added advantage that the contents of the memory can be rewritten and the original image data can be edited and output. Then data v6 is 1 again
Play between frames. v7 is playback between two frames, but since the same section playback information is set, the playback is always performed from the recorded medium regardless of whether the playback device has a frame memory or not. In this way, the original image data without data processing shown in FIG. 3(a) is reproduced.

Although this embodiment describes a playback device using a frame memory, a playback device without a frame memory outputs a playback signal from the original recording medium while the playback information of the same section is obtained. shall be.

As described above, according to the present embodiment, control information for sending a video data signal to the frame memory in which the playback device stores the video data signal in a specific section of the video signal, control information for continuing to play the same video signal section, and control information for continuing to play the same video signal section, and By providing a configuration for recording control information about the length of time from one video signal section to the next video signal section, video data between 14 frames v1 to v7 in FIG. It is possible to temporally compress and record the 7 frames from v1 to V7 in FIG. 3(b).

Effects of the Invention As explained above, according to the present invention, when the same video data signal is continuously recorded, the video data signal is recorded only once, and a command for reproducing the same section is written in the control information section. Record the control information and the control information for how long the same video data is to be played until the next section.
The recording time can be compressed, making it possible to record for a longer time than the recording time of the recording medium.

Furthermore, when reproducing this signal, by detecting the video data signal and the control information part and executing the recorded commands, it is possible to perform reproduction for a longer time than the original recorded time.

Furthermore, if frame memory transfer information is recorded, data can be transferred to the frame memory and output from the frame memory instead of being reproduced from the medium.

In this way, it is possible to achieve a playback time that is longer than the recording time using the same recording medium, which has great practical effects.

[Brief explanation of drawings]

FIG. 1 is a diagram showing the recording format of control information in an embodiment of the present invention, FIG. 2 is a diagram showing the signal arrangement and control information of video data of a playback device, and FIG. 4 is a diagram showing a flowchart of command control. a... synchronization signal indicating recording of control information, b... control information of a command to transfer the video data signal to the frame memory, C... control information of a command to continue reproducing the same video signal section, d...
Control information for the length of time from the current video signal section to the reproduction of the next video signal section, 1... input video signal, 2... circuit for separating synchronization signals,
3... A circuit that separates the vertical synchronization signal, 4... A circuit that detects a specific section in which control information is recorded, 5.
...Circuit for separating data signals, 6.Circuit for taking in the control information section, 7.Circuit for detecting synchronization signals of control information, 8..Circuit for storing data signals in frame memory, 9.・Circuit for selecting and switching data signals,
DESCRIPTION OF SYMBOLS 10... Output video data signal, 11... Detection unit for transfer information to frame memory, 12... Detection unit for reproduction information of the same section, 13... Detection unit for time information up to the next section, 14... Instruction control unit, 15
...Control command output signal to the drive device.

Claims (2)

[Claims] (1) A synchronization signal that indicates that control information is recorded in a specific section of the video signal, control information that sends the video data signal to the frame memory where the playback device stores the video data signal, and continues playing the same video signal section. Recording different video data signals for each signal section of video data separated into predetermined time units together with control information and control information about the length of time from the current video signal section until the next video signal section is played. A time compression recording method for a video data signal, characterized in that: (2) means for separating the synchronization signal of the time-compressed input video signal; means for separating the vertical synchronization signal from the separated synchronization signal; and detecting a specific section in which control information is recorded from the separated synchronization signal. means for separating a data signal from the video signal; means for capturing a control information part from the data signal separated based on the specific section detection output signal; means for detecting a control information synchronization signal from the synchronization signal detection output signal; detection means for detecting reproduction information of the same section and time information up to the next section from the control information based on the synchronization signal detection output signal; and detection means for detecting the vertical synchronization signal and the previous period. By reproducing the input video signal based on the control information detected by the means, and if reproduction information of the same section is obtained, continuously reproducing that section until the time set by the time information until the next section. 1. A time expansion playback device for a video data signal, comprising: control means for outputting a control command to a drive device for playback as an original video signal.