JPH07322293A - Image playback device - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide an image reproducing device capable of reproducing all encoded images without truncation and capable of instructing copy prohibition. A PAL sync signal generating means 3 generates a PAL first sync signal and a color subcarrier signal.
The NTSC sync signal generating means 4 generates a second sync signal of the NTSC system. The encoded image information is decoding means 2
Is decoded and becomes a video signal composed of luminance information Y, color information U and V. At this time, if the frame rate of the video signal decoded by the decoding means 2 matches the second sync signal, the decoding timing of the video signal is adjusted in synchronization with the second sync signal. The video signal is modulated by the encoding means 5 using the PAL color subcarrier signal, and combined with the second synchronizing signal to be output as a composite video signal.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image reproducing apparatus for decoding image information encoded by high efficiency image encoding and reproducing a video signal.

[0002]

2. Description of the Related Art In recent years, image reproducing devices have begun to be put to practical use by using a CD-ROM as a transmission medium.

A conventional image reproducing device is a CD-RO.
MPEG (Moving Picture Experts Group) / IS for M
There is one that records image information that is highly efficient image coded according to the O11172 standard and uses it as a video disc.

A conventional image reproducing apparatus will be described below. FIG. 2 shows a block diagram of this conventional image reproducing apparatus. In FIG. 2, reference numeral 21 is a disk reproducing means for reading the image information coded in the MPEG standard which is recorded on the CD-ROM, and 22 is for decoding the read image information and synchronizing with a given sync signal. Decoding means for outputting a video signal as a result of decoding, 23 is a synchronizing signal generating means for generating a synchronizing signal, and 24 is an encoding means for modulating the video signal and synthesizing with the synchronizing signal to output a composite video signal.

The operation of the image reproducing apparatus configured as described above will be described below.

First, the synchronizing signal generating means 23 is a predetermined TV.
A sync signal and a color subcarrier signal of a system such as a PAL system are generated. The disc reproducing means 21 is a CD-R
The image information recorded in the OM is read, the read image information is decoded by the decoding means 22, and the luminance information Y,
The video signal is composed of color information U and V. At this time, the decoding means 22 adjusts the decoding timing of the video signal in synchronization with the synchronizing signal from the synchronizing signal generating means 23. The video signal thus obtained is modulated by the encoding means 24 by the PAL system, which is a predetermined TV system, using the color subcarrier signal, and is combined with the synchronizing signal and output as a composite video signal.

[0007]

However, in the above-mentioned conventional configuration, if the image information recorded in the CD-ROM is encoded from the original image of the PAL system frame rate, all the recorded image information is recorded. Although video can be reproduced, when encoded from an original image with a frame rate of NTSC system, the number of display frames in the NTSC system is larger than that in the PAL system. Therefore, frame thinning processing or the like is necessary in the rate conversion process. If the contents of the images before and after the discarded frame are fast moving, there is a problem that the images appear visually discontinuous and jerky.

Further, since the composite video signal output in this manner is of the standard TV system, there is a problem in that the VTR or the like is copied against the supplier of the image information.

The present invention solves the above-mentioned conventional problems, and an object of the present invention is to provide an image reproducing apparatus which can reproduce all coded images without truncating them and can instruct copy prohibition.

[0010]

In order to achieve this object, an image reproducing apparatus of the present invention is configured to generate a color subcarrier signal and a first synchronizing signal defined by the first TV system.
Synchronization signal generating means, second synchronization signal generating means for generating a second synchronization signal defined by the second TV system, and image information encoded by high-efficiency image encoding,
Or, a decoding means for reproducing a video signal in synchronization with the second synchronizing signal, and a video signal is modulated by a modulation method defined by the first TV system by using a color subcarrier signal and selectively used by the decoding means. An image reproducing apparatus comprising an encoding means for outputting a composite video signal combined with the first or second synchronization signal, wherein the frame rate of the decoded video signal is the first or the second TV. When it matches the system, the matching TV system sync signal is used in the decoding means and the encoding means. Further, when the copy prohibition instruction signal transmitted together with the encoded image information is detected, the decoding means and the encoding means use a synchronization signal that does not match the first TV system.

[0011]

According to the present invention, according to the above-mentioned structure, the first synchronizing signal generating means generates the first synchronizing signal and the color subcarrier signal of the first TV system, for example, the PAL system. Second
The synchronizing signal generating means is a second TV system such as NTSC.
The second synchronization signal of the scheme is generated. The encoded image information is decoded by the decoding means to be a video signal composed of luminance information Y, color information U and V. At this time, when the frame rate of the video signal decoded by the decoding means matches the second sync signal, the decoding timing of the video signal is adjusted in synchronization with the second sync signal. The video signal is first encoded by the encoding means.
The PAL system color subcarrier signal, which is a TV system, is modulated, combined with the second sync signal, and output as a composite video signal.

Although the composite video signal has a frame frequency of the NTSC system, not the PAL system, it can be synchronized because the TV receiver has a wide allowable range for synchronization pull-in.
Since the modulation system is the PAL system, it can be displayed on a TV receiver.

On the other hand, when the frame rate of the video signal decoded by the decoding means matches the first sync signal, the PAL system is also selected for the sync signal, so that the PAL system standard composite video signal is obtained and the TV receiver receives it. Of course it can be displayed.

When the copy prohibition instruction signal transmitted together with the encoded image information is detected, the second synchronizing signal is used by the decoding means and the encoding means regardless of the frame rate of the decoded video signal.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows a block diagram of an image reproducing apparatus in a first embodiment of the present invention. In FIG. 1, 1
Is a disc reproducing means for reading the image information encoded in the MPEG standard recorded on the CD-ROM, 2 is for decoding the read image information, and selecting one from the given two synchronizing signals. Decoding means for synchronizing and outputting a video signal as a decoding result, 3 is a PAL synchronizing signal generating means for generating a PAL synchronizing signal and a color subcarrier signal,
4 is an NTS that generates an NTSC sync signal of the NTSC system.
C sync signal generating means 5 is an encoding means for modulating a video signal, synthesizing the sync signal with the sync signal, and outputting a composite video signal.

The operation of the image reproducing apparatus of this embodiment constructed as described above will be described below.

First, the synchronizing signal generating means 3 generates a PAL synchronizing signal and a color subcarrier signal of the PAL system,
The NTSC sync signal generating means 4 generates an NTSC sync signal. The disc reproducing means 1 reads the image information recorded in the CD-ROM, and the read image information is decoded by the decoding means 2 to become a video signal composed of the luminance information Y and the color information U and V. At this time, when the frame rate of the decoded video signal matches the PAL system, the decoding means 2 (in the MPEG standard, the coded image information includes information indicating the frame rate and the image size. (Easy determination), and adjust the video signal decoding timing in synchronization with the PAL synchronization signal. Also, when the frame rate of the decoded video signal matches the NTSC system, the decoding timing of the video signal is adjusted in synchronization with the NTSC sync signal.

The video signal thus obtained is subjected to a predetermined PA using the color subcarrier signal in the encoding means 5.
The signal is modulated by the L system, combined with the synchronization signal selected by the decoding means 2, and output as a composite video signal.

As described above, according to this embodiment, a decoding means for selecting and synchronizing one of a plurality of synchronizing signals and outputting a video signal as a decoding result, and a video signal modulated and selected by the decoding means 2. The composite video signal can be obtained at the frame rate and the image size at the time of coding, which is coded according to the MPEG standard or the like, by using the encoding means for synthesizing the composite video signal with the generated synchronizing signal. Even if the image information encoded from the original image is displayed on the PAL system TV receiver, the frame thinning as described in the problem of the conventional example may not be performed, and the frame rate conversion process itself is unnecessary. You can

The second embodiment of the present invention has the same structure as the first embodiment, and is different from the first embodiment only in the decoding means 2.
In the process of reading and decoding the image information from the CD-ROM, when the copy inhibition instruction signal recorded together with the image information is detected, the NTSC sync signal is used by the decoding means 2 and the encoding means 5.

As described above, according to the present embodiment, when the image information encoded from the original picture of the PAL system is processed, P
Obviously, if the AL synchronization signal is used by the decoding means 2 and the encoding means 5, it can be displayed on the PAL system TV receiver, but it should be noted that the NTSC synchronization signal can also be displayed by using the decoding means 2 and the encoding means 5. However, when the copy prohibition instruction signal is detected, even if the image information is encoded from the original picture of the PAL system, by selecting the NTSC sync signal, the VT which can record only the standard TV system.
Copy protection for R can be performed.

Therefore, it is possible to prohibit copying against the intention of the image information supplier using the VTR or the like.

Although the CD-ROM is used as the image information transmission medium in the first and second embodiments, the transmission medium is not particularly limited. Further, although the composite video signal which is the final output is described as the PAL system, it can be carried out in the same manner with other systems, and the TV system is not limited.

[0025]

As described above, the present invention provides the first sync signal generating means for generating the color subcarrier signal and the first sync signal defined by the first TV system, and the second sync system defined by the second TV system. Second sync signal generating means for generating two sync signals, and image information coded by high-efficiency image coding is decoded, and a video signal is reproduced in synchronization with the first or second sync signal. And a composite video signal obtained by modulating the video signal with the color subcarrier signal by the modulation method defined by the first TV system and combining with the first or second synchronizing signal selected and used by the decoding means. When the frame rate of the encoded video signal and the frame rate of the decoded video signal match the first or second TV system, the matching TV system synchronizing signal is used in the decoding unit and the encoding unit. Further, when the copy prohibition instruction signal transmitted together with the coded image information is detected, a control method using a synchronizing signal which does not match the first TV system in the decoding means and the encoding means is provided, so that the MPEG standard etc. It is possible to obtain the composite video signal at the frame rate and the image size at the time of encoding, which is encoded, and even if the image information encoded from the original image of the NTSC system is displayed on the PAL system TV receiver, frame thinning is performed. The frame rate conversion process itself can be dispensed with.

Although it can be displayed on the TV receiver,
It is possible to realize a copy protection effect that cannot be recorded by a VTR or the like.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of an image reproducing apparatus according to an embodiment of the present invention.

FIG. 2 is a block diagram showing the configuration of a conventional image reproducing device.

[Explanation of symbols]

 1 disk reproducing means 2 decoding means 3 PAL synchronizing signal generating means 4 NTSC synchronizing signal generating means 5 encoding means

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Claims (3)

[Claims] 1. A first sync signal generating means for generating a color subcarrier signal and a first sync signal defined by the first TV system, and a second sync signal for defining a second sync signal defined by the second TV system. Two
Synchronizing signal generating means, decoding means for decoding image information coded by high-efficiency image coding, and reproducing a video signal in synchronization with the first or second synchronizing signal; Of the color subcarrier signal by the modulation method defined by the first TV system, and outputs a composite video signal synthesized with the first or second synchronizing signal selected and used by the decoding means. And an image reproducing device including means. 2. The frame rate of the decoded video signal is
2. The image reproducing apparatus according to claim 1, wherein, when the first or second TV system is matched, the matching TV system synchronization signal is used in the decoding means and the encoding means. 3. When the copy prohibition instruction signal transmitted together with the image information coded by the high-efficiency image coding is detected, the decoding means and the encoding means use the synchronization signal which is not compatible with the first TV system. The image reproducing apparatus according to claim 1, which is characterized in that.