JP2004173070A - Video signal reproducing device and method therefor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve the problem that decoded and reproduced signals are unsuccessfully consecutive in format switching parts when reading and reproducing data from a magnetic tape on which signals encoded by different formats such as a DV format and an MPEG format are recorded together. <P>SOLUTION: A video signal reproducing device has a reproducing circuit 102 for reproducing first image signals encoded by the DV format using intra-frame encoding and second image signals encoded by the MPEG encoding system using inter-frame encoding, from a magnetic tape 101, a DV signal decoding circuit 106 for decoding the first image signals, an MPEG signal decoding circuit 107 for decoding the second image signals, and a buffer 105 which delays the first image signals reproduced by the reproducing circuit 102 for a prescribed period of time related to decoding processing in the MPEG signal decoding circuit 107 and then supplies them to the DV signal decoding circuit 106. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a video signal reproducing technique for reproducing a video signal recorded on a magnetic tape such as a DV (Digital Video) tape.
[0002]
[Prior art]
Conventionally, when a video signal and an audio signal are recorded on a magnetic tape such as a DV tape, a format called a DV format proposed by the HD Digital VCR Council has been mainly used. The encoding system in the DV format is an intra encoding system for performing compression within a frame, and is provided in the digital video camera when decoding of an encoded signal read from the magnetic tape is completed. It was possible to display and output on a video display means such as an LCD (Liquid Crystal Display) or a finder. In addition to the DV format, there is a method of encoding a video or audio signal in the MPEG format and recording the video and audio data on a magnetic tape. Such a technique is disclosed, for example, in Japanese Patent Application Laid-Open No. 10-271441.
[0003]
[Problems to be solved by the invention]
However, when reading and reproducing data recorded in these formats from a magnetic tape on which signals encoded in different formats such as the DV format and the MPEG format are both recorded, for example, as shown in FIG. As described above, there is a problem that the connection of the decoded reproduction signal is deteriorated in the format switching portion. Note that DV in FIG. 5 indicates a frame recorded in the DV format. Also, I, B, and P indicate frames recorded in the MPEG format, respectively, and indicate I, B, and P pictures, respectively.
[0004]
As described above, since the DV format is an intra-encoding method, as shown in FIG. 6, when decoding of an arbitrary frame is completed, a video signal of one decoded frame can be displayed on a display screen. It is possible. On the other hand, since the MPEG format is coded by using the inter-coding method in addition to the intra-coding, the I-picture is decoded as shown in FIG. As a result, the preceding and succeeding B pictures are decoded and displayed. Therefore, the decoding time of the MPEG format signal has a larger delay amount than the decoding time of the DV format signal.
[0005]
Therefore, if a signal compressed in the MPEG format is mixedly recorded after a signal compressed in the DV format on the same magnetic tape, the amount of delay for decoding the MPEG format signal is longer than that for decoding the DV format signal. It is larger than the delay amount. Therefore, at the connection portion, a decoded signal of data recorded in the DV format on the display screen is displayed in a frozen state, for example, as indicated by 501 in FIG. Conversely, if a signal compressed in the DV format is recorded after a signal compressed in the MPEG format, the frame indicated by “2DV” in the DV format is decoded first at the connection portion, As shown by 502 in FIG. 5, the display is switched to the display of the DV format signal before displaying all the frames in the signal of the MPEG format, and a frame that is not displayed occurs in the signal of the MPEG format. .
[0006]
SUMMARY OF THE INVENTION The present invention has been made in view of the above-described conventional example, and provides a video signal reproducing apparatus and a method thereof that eliminate the inconvenience of a connected portion in a format switching unit when reproducing an image signal encoded in a different format. The purpose is to provide.
[0007]
[Means for Solving the Problems]
In order to achieve the above object, a video signal reproducing apparatus according to the present invention has the following configuration. That is,
Reproducing a first image signal encoded by a first encoding method using intra-frame encoding and a second image signal encoded by a second encoding method using inter-frame encoding from a recording medium Playback means to
First decoding means for decoding the first image signal;
Second decoding means for decoding the second image signal;
Delay means for delaying the first image signal reproduced by the reproduction means and supplying the delayed first image signal to the first decoding means for a predetermined period related to the decoding processing by the second decoding means.
[0008]
In order to achieve the above object, a video signal reproducing method according to the present invention includes the following steps. That is,
A first image signal encoded by a first encoding method using intra-frame encoding and a second image signal encoded by a second encoding method using inter-frame encoding are recorded. A reproducing step of reproducing a signal from a recording medium;
A first decoding step of decoding the first image signal reproduced in the reproduction step;
A second decoding step of decoding the second image signal reproduced in the reproduction step;
A delay step of delaying the first image signal reproduced in the reproduction step for a predetermined period related to the decoding processing in the second decoding step;
It is characterized by having.
[0009]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.
[0010]
[Embodiment 1]
FIG. 1 is a block diagram showing a configuration of a video signal reproducing apparatus according to Embodiment 1 of the present invention. FIGS. 3 and 4 show encoded signals in a magnetic tape recorded in DV format and MPEG format, respectively. FIG. 3 is a diagram illustrating an example of a video signal decoded on the magnetic tape using the video signal reproduction device according to the present embodiment.
[0011]
In the first embodiment, first, as shown in FIG. 3, a signal encoded in the DV format is followed by a signal encoded in the MPEG format such as MP @ HL or MP @ H-14, as shown in FIG. An example will be described in which a signal encoded in the DV format is given a predetermined delay when the magnetic tape 101 on which is recorded is reproduced.
[0012]
In FIG. 1, the magnetic tape 101 records a video signal and an audio signal encoded in the MPEG format after a signal encoded in the DV format, as described above. The reproduction circuit 102 reproduces a signal recorded on the magnetic tape 101 and supplies the reproduced signal to an A / D converter (not shown) to convert an analog signal into a digital signal. The format detector 103 reads a format ID indicating the format recorded on the magnetic tape 101 from the signal digitally converted by the A / D converter. According to the format ID detected by the format detection unit 103, the signal being reproduced from the magnetic tape 101 is a signal compressed and recorded in the DV format or a signal compressed and recorded in the MPEG format. And outputs a signal 112 of the determination result to the control circuit 111. It is assumed that the format ID for determining the format recorded on the magnetic tape 101 is recorded in the ITI section or the subcode area of the magnetic tape 101 when recording a video signal.
[0013]
When the control circuit 111 determines that the currently reproduced signal is a signal recorded in the DV format according to the format ID detected by the format detection circuit 103, the control circuit 111 outputs the detection signal 112 from the format detection unit 103. , The switch 104 is controlled to supply the output of the reproduction circuit 102 to the buffer 105. Further, based on this detection signal 112, the control circuit 111 has corresponded to the delay period of the buffer 105 after the signal of the DV format is reproduced, that is, after the detection signal 112 indicating the DV format is input, as described later. The connection of the switch 108 is switched at the timing transmitted for the period, so that the output of the DV signal decoding circuit 106 is selected and output to the display circuit 109.
[0014]
On the other hand, if the control circuit 111 determines that the reproduced signal is a signal recorded in the MPEG format, the control circuit 111 controls the switch 104 according to the detection signal 112 from the format detection unit 103 to output the output of the reproduction circuit 102. The signal is switched to be supplied to the MPEG signal decoding circuit 107. Similarly, after the switch 108 is controlled to reproduce the signal in the MPEG format, that is, after the detection signal 112 indicating the MPEG format is input, a period corresponding to the delay period by the buffer 105 as will be described later. The output is switched so that the output of the MPEG signal decoding circuit 107 is output to the display circuit 109 at the timing when the data is transmitted.
[0015]
With such a configuration, the encoded signal supplied to the buffer 105 via the switch 104 is delayed by a predetermined amount, sent to the DV signal decoding circuit 106, and decoded there. The signal supplied to the MPEG signal decoding circuit 107 via the switch 104 is decoded by the MPEG signal decoding circuit 107 with almost no delay.
[0016]
The signal decoded by the DV signal decoding circuit 106 or the MPEG signal decoding circuit 107 is supplied to a display circuit 109 via a switch 108. For example, an LCD provided in a digital video camera and a display unit such as a finder are provided. Displayed at 110.
[0017]
As described above, in the first embodiment, by giving a predetermined delay amount to the encoded signal recorded in the DV format, the reproduction signal in the DV format is output as indicated by 301 and 302 in FIG. The display is delayed by a predetermined time. Also, in order to prevent the coded signal recorded in the MPEG format from being delayed as in the case of decoding the reproduced signal in the DV format, the MPEG signal is reproduced following the reproduction of the frames 301 and 302 in FIG. The encoded signal recorded in the format is reproduced and displayed. As a result, an image in which continuity is maintained in the switching unit between the DV format and the MPEG format is displayed.
[0018]
Next, as shown in FIG. 4, after the signal encoded in the MPEG format such as MP @ HL or MP @ H-14, the magnetic tape 101 on which the signal encoded in the DV format is recorded is reproduced. In this case, an example will be described in which a signal encoded in the DV format is reproduced with a predetermined delay. In this case, similarly to the above processing, by providing a delay to the DV format decoded signal, continuity in the switching unit between the MPEG format and the DV format is maintained as indicated by 401, 402 and 403 in FIG. The hit image is displayed.
[0019]
The delay amount (storage data amount) by the buffer 105 in the first embodiment is a period during which the image signal recorded in the MPEG format can be decoded by an amount that can be appropriately displayed as a moving image. For example, in the example of FIG. 3, the decoding of the image signals of 6 frames from 1B to 3P is completed at the time when the decoding of the 5B frame is completed among the image signals of the MPEG format. Therefore, the data of the DV format for six frames may be stored in the buffer 105. It is assumed that the delay time in the delay circuit 111 is equal to the delay time in the buffer 105.
[0020]
In this manner, the period during which the MPEG data can be appropriately displayed as a moving image after decoding the MPEG data varies depending on the encoding format of the MPEG format image signal, such as the arrangement of I, P, and B pictures. . Therefore, it is desirable to set the delay amount of the buffer 105 in accordance with the encoding format of the MPEG data.
[0021]
[Embodiment 2]
FIG. 2 is a block diagram illustrating a configuration of a video signal reproducing apparatus according to Embodiment 2 of the present invention, and portions common to the configuration of FIG. 1 described above are denoted by the same reference numerals.
[0022]
In the second embodiment, a magnetic tape 101 in which a signal encoded in an MPEG format such as MP @ HL or MP @ H-14 is recorded after a signal encoded in a DV format, MP @ HL or MP When playing back the magnetic tape 101 on which a signal encoded in the DV format is recorded after a signal encoded in the MPEG format such as H-14, a decoded signal encoded in the DV format is reproduced. Playback is performed with a predetermined delay.
[0023]
In FIG. 2, a reproduction circuit 102 reproduces a signal recorded on a magnetic tape 101, supplies the signal to an A / D converter (not shown), and converts an input signal from an analog signal to a digital signal. The format detection unit 103 reads a format ID indicating the format of the signal recorded on the magnetic tape 101 from the signal digitally converted by the A / D conversion unit. According to the format ID detected by the format detection unit 103, it is determined whether the signal being reproduced is a signal compressed and recorded in the DV format or a signal compressed and recorded in the MPEG format. The format detection signal 112 is output. It is assumed that the format ID for determining the format recorded on the magnetic tape 101 is recorded in the ITI section or the subcode area of the magnetic tape 101 when recording a video signal.
[0024]
When the control circuit 111 determines that the currently reproduced signal is a signal compressed and recorded in the DV format according to the format ID detection signal 112 detected by the format detection circuit 103 in this manner, the switch 104 Is controlled so that the output of the reproduction circuit 102 is supplied to the DV signal decoding circuit 106. Further, based on the detection signal 112, the control circuit 111 corresponds to a delay period by the buffer 105a after the signal of the DV format is reproduced, that is, after the detection signal 112 indicating the DV format is input, as described later. The connection of the switch 108 is switched at the timing transmitted for the period, and the output of the buffer 105 a is selected and output to the display circuit 109.
[0025]
On the other hand, if the control circuit 111 determines that the reproduced signal is a signal compressed and recorded in the MPEG format, the control circuit 111 controls the switch 104 based on the detection signal 112 to decode the output of the reproduction circuit 102 into an MPEG signal. Switching is performed so as to supply to the circuit 107. Similarly, the switch 108 is controlled to reproduce a signal in the MPEG format, that is, a period corresponding to the delay period by the buffer 105a after the detection signal 112 indicating the MPEG format is input as described later. At this time, the connection of the switch 108 is switched, and the output of the MPEG signal decoding circuit 107 is selected and output to the display circuit 109. The coded signal supplied to the DV signal decoding circuit 106 via the switch 104 is decoded in the DV signal decoding circuit 106, temporarily stored in the buffer 105a, delayed by a predetermined period, and output to the switch 108. Is done. The signal supplied to the MPEG signal decoding circuit 107 via the switch 104 is decoded by the MPEG signal decoding circuit 107.
[0026]
The signal decoded by the DV signal decoding circuit 106 and stored in the buffer 105a or the signal decoded by the MPEG signal decoding circuit 107 is supplied to the display circuit 109 via the switch 108, and is supplied to, for example, a digital video camera. The image is displayed on the display unit 110 which is an LCD and a finder provided.
[0027]
In the second embodiment, by giving a predetermined delay amount to an encoded signal recorded in the DV format, as shown by 301 and 302 in FIG. Will be displayed only late. In addition, in order to prevent the coded signal recorded in the MPEG format from being delayed as in the case of decoding the reproduced signal in the DV format, as shown by 301 and 302 in FIG. The video in which the continuity is maintained in the switching unit is displayed.
[0028]
Thus, for example, as shown in FIG. 3, when switching from the DV format playback signal to the MPEG format playback signal, the DV format playback signal is displayed with a delay of two frame periods, for example, as shown by 301 and 302 in FIG. Is done.
[0029]
Also, as shown in FIG. 4, when a DV format signal is recorded after an MPEG format signal, as in the case of the MO, as shown at 401 to 403 in FIG. It will be displayed with a delay. In addition, since a delay of a predetermined period is not given to the reproduction signal in the MPEG format as in the reproduction signal in the DV format, the reproduction signal in the MPEG format is transmitted to the 6P frame in FIG. All images can be reproduced, and a video with continuity maintained in the switching section between the DV format and the MPEG format is displayed.
[0030]
[Embodiment 3]
Note that, as in the first and second embodiments, a video signal reproducing apparatus that decodes and reproduces encoded data usually includes a buffer memory that temporarily holds a signal read from the magnetic tape 101. , FIG. 8 shows a configuration provided with such a buffer.
[0031]
FIG. 8 is a block diagram showing a configuration of a video signal reproducing apparatus according to Embodiment 3 of the present invention. Portions common to the configuration of FIG. 1 described above are denoted by the same reference numerals, and description thereof is omitted.
[0032]
In FIG. 8, a buffer 80 is a buffer for storing a signal encoded in the MPEG format and read by the reproduction circuit 102.
[0033]
FIG. 7 is a diagram for explaining a process for decoding an MPEG format signal. MPEG format video signals recorded on the magnetic tape 101 are sequentially read from the left of FIG. Are decoded in the order shown in FIG. Therefore, a buffer memory 80 for storing I, B, and P pictures encoded in the MPEG format is required.
[0034]
In this case, it is necessary to make the delay amount of the DV signal buffer 105 (equal to the delay time of the delay circuit 111) larger than the delay amount of the MPEG signal buffer 80. Then, as described with reference to FIGS. 3 and 4, the switching timing is determined by setting the delay amount of the DV format playback signal larger than the delay amount of the MPEG format playback signal.
[0035]
FIG. 9 is a flowchart illustrating a flow of processing in the video reproduction device according to the present embodiment.
[0036]
First, in step S1, a signal stored in a recording medium (here, the magnetic tape 101) is read, and in step S2, the recording format is determined based on the format ID for determining the format recorded in the magnetic tape 101. Is a DV format or an MPEG format. If it is the DV format, the process proceeds to step S3, where the signal from the magnetic tape 101 is delayed by a predetermined amount corresponding to the time required to reproduce a frame in the MPEG format. Then, the process proceeds to step S4, where the delayed signal is subjected to DV decoding. When decoding of the signal in the DV format is completed, the process proceeds to step S5, and the decoded signal is output to the display circuit 109 and displayed on the display unit 110.
[0037]
On the other hand, if it is determined in step S2 that the format recorded on the magnetic tape 101 is the MPEG format, the process proceeds to step S6, and the read signal is decoded by MPEG decoding. The process then proceeds to step S5, where the decoded signal is output to the display circuit 109 and displayed on the display unit 110.
[0038]
In the case of FIG. 2, steps S3 and S4 in FIG. 9 are interchanged. That is, it can be realized by decoding the signal in the DV format in step S3 and delaying the decoded signal (data) in step S4.
[0039]
In the above description, the case where the DV format signal is delayed by the buffer 105 has been described. However, the present invention is not limited to this. For example, the signal may be delayed by using a delay element such as a delay line. It may be delayed.
[0040]
[Other embodiments]
Even if the present invention is applied to a system including a plurality of devices (for example, a host computer, an interface device, a reader, and a printer), the present invention can be applied to an apparatus (for example, a copier, a facsimile device, and the like) including one device. May be applied.
[0041]
Further, an object of the present invention is to supply a storage medium storing a program code of software for realizing the functions of the above-described embodiments to a system or an apparatus, and the computer (or CPU or MPU) of the system or the apparatus to store the program in the storage medium It is also achieved by reading and executing the stored program code.
[0042]
In this case, the program code itself read from the storage medium realizes the function of the above-described embodiment, and the storage medium storing the program code constitutes the present invention.
[0043]
As a storage medium for supplying the program code, for example, a floppy disk, hard disk, optical disk, magneto-optical disk, CD-ROM, CD-R, magnetic tape, nonvolatile memory card, ROM, etc. can be used.
When the computer executes the readout program code, not only the functions of the above-described embodiments are realized, but also an OS (Operating System) running on the computer based on the instruction of the program code. This includes a case where a part of the actual processing is performed and the function of the above-described embodiment is realized by the processing.
[0044]
Further, after the program code read from the storage medium is written into a memory provided in a function expansion board inserted into the computer or a function expansion unit connected to the computer, the function expansion is performed based on the instruction of the program code. This includes the case where the CPU or the like provided in the board or the function expansion unit performs part or all of the actual processing, and the processing realizes the functions of the above-described embodiments.
[0045]
As described in detail above, according to the video signal reproducing apparatus of the present embodiment, when reproducing a magnetic tape on which a DV format and an MPEG format are mixedly recorded, a predetermined format is applied to a DV format decoded signal. By outputting with a delay amount, it is possible to eliminate the inconvenience of connection in the format switching portion.
[0046]
【The invention's effect】
As described above, according to the present invention, when reproducing an image signal encoded in a different format, it is possible to eliminate the inconvenience of a connected portion in a format switching unit.
[Brief description of the drawings]
FIG. 1 is a block diagram illustrating a configuration example of a magnetic tape reproducing device to which Embodiment 1 of the present invention has been applied.
FIG. 2 is a block diagram illustrating a configuration example of a magnetic tape reproducing device to which a second embodiment of the present invention has been applied;
FIG. 3 is a diagram illustrating a decoded signal when a magnetic tape on which an MPEG format signal is recorded after a DV format signal is reproduced by the apparatus of the present invention.
FIG. 4 is a diagram illustrating a decoded signal when a magnetic tape on which a DV format signal is recorded after an MPEG format signal is reproduced by the apparatus of the present invention.
FIG. 5 is a diagram illustrating a decoded signal when a magnetic tape on which a DV format and an MPEG format are mixedly recorded is reproduced by a conventional method.
FIG. 6 is a diagram illustrating a decoded signal when a magnetic tape on which a DV format is recorded is reproduced by a conventional method.
FIG. 7 is a diagram illustrating a decoded signal when a magnetic tape on which an MPEG format is recorded is reproduced by a conventional method.
FIG. 8 is a block diagram showing a configuration of a magnetic tape reproducing device according to another embodiment of the present invention.
FIG. 9 is a flowchart illustrating processing in the magnetic tape reproducing device according to the embodiment of the present invention.

Claims (17)

Reproducing a first image signal encoded by a first encoding method using intra-frame encoding and a second image signal encoded by a second encoding method using inter-frame encoding from a recording medium Playback means to
First decoding means for decoding the first image signal;
Second decoding means for decoding the second image signal;
Delay means for delaying the first image signal reproduced by the reproduction means and supplying the first image signal to the first decoding means for a predetermined period related to the decoding processing by the second decoding means;
A video signal reproducing device comprising: 2. The video signal reproducing apparatus according to claim 1, wherein said delay means includes a buffer memory. 2. The video according to claim 1, further comprising a selection unit that selects one of the signal decoded by the first decoding unit and the signal decoded by the second decoding unit and outputs the selected signal to a display device. Signal playback device. The image processing apparatus further includes a determination unit configured to determine whether the image signal reproduced by the reproduction unit is the first image signal or the second image signal. 4. The video signal reproducing device according to claim 3, wherein Reproducing a first image signal encoded by a first encoding method using intra-frame encoding and a second image signal encoded by a second encoding method using inter-frame encoding from a recording medium Playback means to
First decoding means for decoding the first image signal reproduced by the reproduction means;
Second decoding means for decoding the second image signal reproduced by the reproduction means;
Delay means for delaying and outputting the output signal of the first decoding means for a predetermined period related to the decoding processing by the second decoding means;
A video signal reproducing device comprising: Reproducing a first image signal encoded by a first encoding method using intra-frame encoding and a second image signal encoded by a second encoding method using inter-frame encoding from a recording medium Playback means to
First decoding means for decoding the first image signal;
Second decoding means for decoding the second image signal;
First delay means for delaying the first image signal reproduced by the reproduction means for a first predetermined period and supplying the delayed first image signal to the first decoding means;
A second delay unit that delays the second image signal reproduced by the reproduction unit for a second predetermined period shorter than the first predetermined period and supplies the second image signal to the second decoding unit;
A video signal reproducing device comprising: Reproducing a first image signal encoded by a first encoding method using intra-frame encoding and a second image signal encoded by a second encoding method using inter-frame encoding from a recording medium Playback means to
First decoding means for decoding the first image signal and outputting a decoded image signal;
Second decoding means for decoding the second image signal and outputting a decoded image signal;
A period from when the first image signal is reproduced by the reproducing unit to when the first image signal is decoded and output from the first decoding unit, and a period after the second image signal is reproduced by the reproducing unit after the second image signal is reproduced. Delay means for delaying the first image signal reproduced by the reproduction means and supplying the first image signal to the first decoding means so as to substantially match a period from decoding to output.
A video signal reproducing device comprising: Reproducing a first image signal encoded by a first encoding method using intra-frame encoding and a second image signal encoded by a second encoding method using inter-frame encoding from a recording medium Playback means to
First decoding means for decoding the first image signal and outputting a decoded image signal;
Second decoding means for decoding the second image signal and outputting a decoded image signal;
A period from when the first image signal is reproduced by the reproducing means to when the first image signal is decoded and output by the first decoding means, and a period after the second image signal is reproduced by the reproducing means after being reproduced. Delay means for delaying and outputting an output signal of the first decoding means so as to substantially coincide with a period until the signal is decoded and output;
A video signal reproducing device comprising: 9. The video signal reproducing device according to claim 1, wherein the first image signal is an image signal in a format that conforms to a DV format defined by the HD Digital VCR Council. 9. The video signal reproducing device according to claim 1, wherein the second image signal is an image signal according to an MPEG format. A first image signal encoded by a first encoding method using intra-frame encoding and a second image signal encoded by a second encoding method using inter-frame encoding are recorded. A reproducing step of reproducing a signal from a recording medium;
A first decoding step of decoding the first image signal reproduced in the reproduction step;
A second decoding step of decoding the second image signal reproduced in the reproduction step;
A delay step of delaying the first image signal reproduced in the reproduction step for a predetermined period related to the decoding processing in the second decoding step;
A video signal reproducing method comprising: A first image signal encoded by a first encoding method using intra-frame encoding and a second image signal encoded by a second encoding method using inter-frame encoding are recorded. A reproducing step of reproducing a signal from a recording medium;
A first decoding step of decoding the first image signal reproduced in the reproduction step;
A second decoding step of decoding the second image signal reproduced in the reproduction step;
A delay step of delaying the signal decoded in the first decoding step for a predetermined period related to the decoding processing in the second decoding step;
A video signal reproducing method comprising: A first image signal encoded by a first encoding method using intra-frame encoding and a second image signal encoded by a second encoding method using inter-frame encoding are recorded. A reproducing step of reproducing a signal from a recording medium;
A first decoding step of decoding the first image signal reproduced in the reproduction step;
A second decoding step of decoding the second image signal reproduced in the reproduction step;
A first delay step of delaying the first image signal reproduced in the reproduction step for a first predetermined period and supplying the delayed first image signal to the first decoding step;
A second delay step of delaying the second image signal reproduced in the reproduction step for a second predetermined period shorter than the first predetermined period and supplying the delayed second image signal to the second decoding step;
A video signal reproducing method comprising: A first image signal encoded by a first encoding method using intra-frame encoding and a second image signal encoded by a second encoding method using inter-frame encoding are recorded. A reproducing step of reproducing a signal from a recording medium;
A first decoding step of decoding the first image signal and outputting a decoded image signal;
A second decoding step of decoding the second image signal and outputting a decoded image signal;
A period from when the first image signal is reproduced in the reproduction step to when it is decoded and output in the first decoding step, and a time period when the second image signal is reproduced in the reproduction step after the second image signal is reproduced. A delaying step of delaying the first image signal reproduced in the reproduction step and supplying the first image signal to the first decoding step so as to substantially match a period until decoding and output.
A video signal reproducing method comprising: A first image signal encoded by a first encoding method using intra-frame encoding and a second image signal encoded by a second encoding method using inter-frame encoding are recorded. A reproducing step of reproducing a signal from a recording medium;
A first decoding step of decoding the first image signal and outputting a decoded image signal;
A second decoding step of decoding the second image signal and outputting a decoded image signal;
A period from when the first image signal is reproduced in the reproduction step to when it is decoded and output in the first decoding step, and a time period when the second image signal is reproduced in the reproduction step after the second image signal is reproduced. A delaying step of delaying and outputting the output signal of the first decoding step so as to substantially match the period until decoding and output at
A video signal reproducing method comprising: The video signal reproducing method according to any one of claims 11 to 15, wherein the first image signal is an image signal in a format according to a DV format defined by the HD Digital VCR Council. 16. The video signal reproducing method according to claim 11, wherein the second image signal is an image signal according to an MPEG format.

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