Motion video signal processing for recording or reproducing – Local trick play processing – With randomly accessible medium
Reexamination Certificate
1999-06-15
2003-07-22
Chevalier, Robert (Department: 2615)
Motion video signal processing for recording or reproducing
Local trick play processing
With randomly accessible medium
C386S349000, C386S349000
Reexamination Certificate
active
06597861
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to an information record medium such as an optical disk of a high recording density type, which is capable of recording information such as video information, audio information and the like at a high density, and which is represented by a DVD (Digital Video or Versatile Disk). The present invention also relates to a recording apparatus for recording the information onto the information record medium, and a reproducing apparatus for reproducing the information from the information record medium.
2. Description of the Related Art
Conventionally, a so-called LD (Laser Disk) and a so-called CD (Compact Disk) are generalized as optical disks, on which information such as video information, audio information and the like is recorded.
On the LD, the CD or the like, the video information and the audio information are recorded together with time information indicating a time at which each information is to be reproduced with respect to a reproduction start position, which each LD or the like has, as a standard position. Thus, other than a general normal reproduction to reproduce the recorded information in the order of recording various special reproductions are possible, such as a reproduction to extract and listen to an only desirable music out of a plurality of recorded musics, a reproduction to listen to the recorded musics in a random order and so on, in case of the CD, for example.
However, there is a problem that, according to the above mentioned CD, LD or the like, a so-called interactive and variegated reproduction is not possible in which the audience can have a plurality of selection branches as for the video or audio information to be displayed or sound-outputted and in which the audience can select them to watch or listen to it.
Namely, for example, in case of giving audience to a foreign movie on the LD, it is not possible to select one of languages to be used for a subtitle (caption) displayed on the picture plane (e.g., select one of the subtitle in Japanese and the subtitle in the original language) so as to display the subtitle in the selected language, or, in case of giving audience to a music recorded on the CD, it is not possible to select one of sound voices of the music (e.g., select one of the English lyric and the Japanese lyric).
On the other hand, various proposals and developments are being made as for the DVD, as an optical disk in which the memory capacity is improved by about ten times without changing the size of the optical disk itself as compared with the aforementioned conventional CD. According to the knowledge of the present inventors, it is anticipated that it is possible, as for the DVD having such a large memory capacity, to: divide audio information, video information or the like by an appropriate length respectively into an audio pack, a video pack or the like; add additional information such as header information to each pack; switch and multiplex these packs; and reproduced the multiplexed audio information, video information or the like.
However, in the field of the audio or video related technique, the audio information, the video information or the like is generally treated in a relatively large unit e.g. a so-called audio frame or video frame, at the time of recording, editing and reproducing by the recording apparatus and the reproducing apparatus. Thus, for example, assuming that the frequency of this audio frame is 75 Hz, which is the same as the case of CD, the compatibility in frequency of the audio frame is generally bad with the audio pack, the video pack or the like multiplexed in the aforementioned DVD. This results in that a very complicated reproduction method is estimated to be necessary. Further, in the technical art of the DVD, the actuality is such that a person having an ordinary skill in this art does not even recognize the subject or problem itself that the compatibility in frequency of the audio frame used in the conventional CD etc. is bad with the audio pack etc. which is expected to be usable in the aforementioned DVD.
SUMMARY OF THE INVENTION
It is therefore an object of the present invention to provide an information record medium, on which the audio information, which is to he recorded, edited and reproduced by the unit of audio frame, is recorded in a form of being divided by an appropriate length and multiplexed, can be relatively easily recorded, edited and reproduced, and also provide an apparatus for recording the same and an apparatus for reproducing the same.
The above object of the present invention can be achieved by an information record medium having a record track to be reproduced by an information reproducing apparatus, which is provided with a read device and reproduces audio information by a predetermined audio frame unit while relatively moving the read device along the record track recorded with at least the audio information by the audio frame unit. In the information record medium of the present invention, a plurality of audio packets are arranged along the record track, in each of which audio information pieces constructing the audio information sampled by a predetermined sampling frequency and audio control information for controlling a reproduction of the audio information pieces by the information reproducing apparatus are respectively recorded. The audio control information is provided with time management information for specifying a time, by a predetermined specification frequency, to manage a timing of outputting the audio information, which is included in the audio frame which head is positioned in the audio packet including the audio control information, in the reproduction by the information reproducing apparatus. And that, a frequency of the audio frame and a frequency of the audio packet are prescribed such that the frequency of the audio frame is 1
(n: natural number) of the sampling frequency and 1/m (m: natural number) of the specification frequency, and a data amount of the audio information included in one audio packet is more than a data amount of one audio frame.
According to the information record medium of the present invention, in each of the audio packets arranged along the record the audio information pieces constructing the audio information sampled by a predetermined sampling frequency and the audio control information are respectively recorded. The audio control information is provided with time management information. The time management information specifies a time, by a predetermined specification frequency, to manage a timing of outputting the audio information, which is included in the audio frame which head is positioned in the audio packet including the pertinent audio control information, in the reproduction. At this time, since the frequency of the audio frame is 1
of the sampling frequency, it is possible to avoid a case where the audio frame is cut in the middle of sampling. Further, since the frequency of the audio frame is 1/m of the specification frequency, the accuracy of the time specified by the time management information can be kept high. Furthermore, since the data amount of the audio information included in one audio packet is more than the data amount of one audio frame, every one of the audio packets can include the time management information respectively. As a result, such a problem is never caused that, because the time management information randomly exists or not exists in the audio packet, the recording position of the information after the time management information is shifted in a random or unknown manner. For example, it is possible to cut reading one portion of the audio control information, which is not shifted, of the bytes in the constant number in the audio packet, and to speedily read another portion of the audio control information, which is necessary for the reproduction, by use of a rather simple algorithm.
Accordingly, the construction of the information recording apparatus or the information reproducing apparatus for the DVD etc., can be
Ishii Hidehiro
Nakamura Hiroshi
Sawabe Takao
Takahashi Tokihiro
Tozaki Akihiro
Morgan & Lewis & Bockius, LLP
Pioneer Electronic Corporation
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