Motion video signal processing for recording or reproducing – Local trick play processing – With randomly accessible medium
Reexamination Certificate
2000-09-29
2001-08-21
Nguyen, Huy (Department: 2615)
Motion video signal processing for recording or reproducing
Local trick play processing
With randomly accessible medium
C386S349000, C386S349000
Reexamination Certificate
active
06278834
ABSTRACT:
BACKGROUND OF THE INVENTION
(1) Field of the Invention
This invention generally relates to a rewriteable optical disc, an optical disc recording apparatus, an optical disc recording method, and a storage medium for storing optical disc recording program, and specifically to a rewriteable optical disc, an optical disc recording apparatus, and an optical disc recording method for facilitating dubbing, and a storage medium for storing an optical disc recording program for facilitating dubbing.
(2) Description of the Prior Art
Recently, DVD(Digital Video/Versatile Disc)-RAM, one of rewriteable optical discs, has been commercialized. The DVD-RAM is a phase-change-type disc having a capacity of several giga bytes. Now that MPEG and MPEG2, standards for compressing/encoding AV (Audio Visual) data, have gone into practical use, it is expected that the DVD-RAM will be used not only in computers but as an AV recording/reproducing medium. That is, the widespread expectation is that the DVD-RAM will be prevalent and replace the magnetic tape which has been a major AV recording/reproducing medium.
It is possible for users to record data onto DVD-RAMs while this is not possible with read-only DVDs (hereinafter referred to as DVD-ROMs). As a result, it is expected that DVD-RAMs provide a wide range of uses.
However, it is not so easy to perform dubbing on conventional optical discs as on the magnetic tapes.
The magnetic tapes have independent areas for recording video tracks and audio tracks. Also, video data and audio data are read/written from/onto the magnetic tapes via respectively independent magnetic heads. Accordingly, it is very easy to perform dubbing of audio data on the magnetic tapes. In case of analog video tape recorders, the time (delay) taken for starting reproducing audio or video data read from the magnetic tape via the head is nearly zero. This is the same for the time (delay) taken for starting writing input audio or video data onto the magnetic tape via the head. As a result, data can be recorded onto the magnetic tape at the same time as the data having been recorded on the magnetic tape is reproduced.
In contrast, in case of an optical disc, the video stream and audio stream are multiplexed into one MPEG stream to be recorded onto the disc. Also, only one pickup is used for both reading and writing data from/onto the optical disc. In the MPEG stream, the video stream is placed before and is processed earlier than the audio stream. This is because the amount of video data to be decoded is greater than that of audio data. Such data structure of the MPEG stream and the construction of the recording/reproducing apparatus make it difficult to perform dubbing to record dubbed data onto the optical disc.
SUMMARY OF THE INVENTION
It is therefore an object of the present invention to provide an optical disc which allows the dubbing to be performed as easily as magnetic tape medium, and an optical disc recording apparatus, an optical disc reproducing apparatus, and a program storage medium storing a program executed in the optical disc recording apparatus.
The above object is fulfilled by a recordable optical disc comprising: a data area in which one or more video objects are recorded, where a video stream, a first audio stream, and a second audio stream are multiplexed into the one or more video objects, the second audio stream being used for dubbing.
With the above-stated construction, it is possible to perform dubbing easily since the second audio stream for dubbing is recorded beforehand in the video objects. It is also possible to record the dubbing audio data together with the original audio data (the first audio stream) since the first and second audio streams are separately recorded.
As a result, it is possible to achieve new applications (e.g., applications for practicing pronunciation of some language and applications including dubbings for Karaoke) which have not been achieved conventionally in recordable optical discs. It is also possible to repeatedly record the dubbing while maintaining the original audio data.
In the above recordable optical disc, the second audio stream for dubbing may have the same reproduction time period as that of the first audio stream.
With such a construction, it is possible to ensure that the first audio stream is dubbed onto the second audio stream over the entire reproduction period.
In the above recordable optical disc, the second audio stream for dubbing may be recorded with the same bit rate as the first audio stream.
With such a construction, it is possible to ensure that the second audio stream for dubbing has the same audio quality as the first audio stream. This is achieved, for example, by using the same encoding mode and the same sampling frequency for the second audio stream as the first audio stream.
In the above recordable optical disc, the second audio stream for dubbing may include audio data which has been generated from the same source as the first audio stream.
With such a construction, the second audio stream for dubbing has the same source as the first audio stream. This enables the audio stream to be used for the performance of a partial dubbing. Furthermore, the second audio stream having had partial dubbing performed includes the same audio data as the first audio stream in a part other than the part in which the dubbing data is recorded. Therefore, the reproducing apparatus needs not switch between the first and second audio streams during the reproduction.
In the above recordable optical disc, the first audio stream may include a plurality of packs which each have a predetermined size, and the second audio stream may include a plurality of packs respectively corresponding to the plurality of packs included in the first audio stream.
Also, in the above recordable optical disc, each of the plurality of packs in the second audio stream may include the same audio data as that included in a corresponding one of the plurality of packs in the first audio stream.
With such a construction, the second audio stream for dubbing corresponds to the first audio stream in units of packs and has the same audio data. As a result, in addition to the above-described partial dubbing, it is possible to return the second audio stream to the state before dubbing. This is achieved by copying the audio data of packs of the first audio stream to the corresponding packs of the second audio stream.
The above recordable optical disc may further comprise: a management area for storing one or more pieces of management information which respectively correspond to the one or more video objects, each of the one or more pieces of management information shows a state of the second audio stream in a corresponding video object and indicates whether dubbing has been performed on the second audio stream in the corresponding video object.
With the above construction, it is possible for the recording apparatus and the reproducing apparatus to manage whether the dubbing stream has had dubbing performed by referring to the management information.
In the above recordable optical disc, each of the one or more pieces of management information may further indicate one of a first state, a second state, and a third state, where the first state indicates that the second audio stream includes the same audio data as the first audio stream, the second state indicates that the second audio stream includes audio data which has been generated from the same source as the first audio stream, and the third state indicates that audio data of the second audio stream is irrelevant to audio data of the first audio stream.
With such a construction, it is possible for the recording apparatus and the reproducing apparatus to manage the state of the dubbing stream by referring to the management information.
The above object is also fulfilled by a recordable optical disc comprising: a data area in which one or more video objects are recorded, where a plurality of elementary streams are multiplexed into the one or more video objects, where one of the plurality of elementary streams
Miwa Katsuhiko
Okada Tomoyuki
Tsuga Kazuhiro
Yagi Tomotaka
Matsushita Electric - Industrial Co., Ltd.
Nguyen Huy
Wenderoth , Lind & Ponack, L.L.P.
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