Motion video signal processing for recording or reproducing – Local trick play processing – With randomly accessible medium
Reexamination Certificate
1997-09-16
2001-08-28
Lee, Young (Department: 2613)
Motion video signal processing for recording or reproducing
Local trick play processing
With randomly accessible medium
C386S349000
Reexamination Certificate
active
06282366
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to a device for recording and reproducing a digital video signal and a digital audio signal.
2. Description of the Related Art
In a video tape recorder for recording and reproducing an analog video signal (hereinafter called as “an analog VTR”) in the prior art, composite video signals to be recorded were recorded together with the content of a vertical blanking period as they were.
At this time, a base band signal of a component with 1 MHz or less was recorded in reference to an electromagnetic converting characteristic between a magnetic head and a magnetic tape and another component having a high frequency (approximately 5.7 MHz) such as a character multiplex broadcasting signal showed a blurred state, resulting in that its recording and reproducing could not be carried out.
As related technologies, the applicant has some following EPs and U.S. Patent Applications.
EP Laid-Open No. 0541029 (corresponding U.S. Patent: pending)
EP Laid-Open No. 0553650 (corresponding U.S. Patent: U.S. Pat. No. 5,349,384)
EP Laid-Open No. 0600467 (corresponding U.S. Patent: pending)
EP Laid-Open No. 0600493 (corresponding U.S. Patent: pending)
EP Laid-Open No. 0614187 (corresponding U.S. Patent: pending)
EP Laid-Open No. 0621731 (corresponding U.S. Patent: pending)
In recent years, there has been a trend that various control signals, video-associated information (information about video) or audio-associated information (information about voice) are inserted into a broadcasting electric wave or a package media within a vertical blanking of a video signal in reference to the electromagnetic converting characteristic. For example, there are CLOSED CAPTION, VBID, WSS and EDTV2 and the like. In addition, EDS (Extended Data Service) for performing various data services under a format of CLOSED CAPTION signal is defined. In this EDS, it is planned to transmit the associated information of voice of television signal (kind of languages, stereo/monoral and the like).
In addition, these format signals include information such as an aspect ratio of a video and a wide television set decodes this information to change over an aspect ratio of a screen.
In turn, in a digital VTR using a video compression technology of which development has been remarkable in recent years, either a vertical blanking period or a horizontal blanking period is eliminated in order to reduce an amount of data of recording signal. Accordingly, recording and reproducing of the video signal including aforesaid various format signals by the digital VTR using such a video compression technology had a problem that these format signals were lost.
The present invention has been invented in order to solve such problems as described above and it is an object of the present invention to enable various associated information signals inserted in the vertical blanking period of the video signal even at the digital VTR using the video compression technology.
SUMMARY OF THE INVENTION
In order to solve the aforesaid problems, the digital video and audio signal recording and reproducing device of the present invention is characterized in that there are provided:
a recording format having a first recording area (a video data recording area) for recording a coded video signal, a second recording area (an audio data recording area) for recording a coded audio signal, and a third recording area (an auxiliary data area) for recording an audio associated data constituted in pack;
means for coding a video signal and recording it in the first recording area;
means for coding an audio signal and recording it in the second recording area;
means for constituting an audio-associated information in pack inserted in a vertical blanking period of the video signal and recording it in the third recording area;
means for reproducing the coded video signal from the first recording area and decoding the video signal;
means for reproducing the coded audio signal from the second recording area and decoding the audio signal; and
means for reproducing the audio-associated information constituted in pack from third recording area and reading out the associated information.
The third recording area is constituted to have a main zone and a sub-zone.
The audio-associated information is constituted in pack and recorded in the sub-zone of the third recording area and the audio-associated information having a high degree of importance is recorded in the main zone of the third recording area.
In this case, the main zone is defined as a zone in which the pack header in the preferred embodiment records packs of 50h and 51h and the sub-zone is defined as a zone in which the pack header in the preferred embodiment records the packs of 52h to 56h.
In addition, in the case that the content in the sub-zone can be understood during reproducing operation, the associated information within the sub-zone is superimposed to a vertical blanking period of a video signal and in turn in the case that the content in the sub-zone can not be understood, only the associated information having a high degree of importance in the main area is taken out and is superimposed to a vertical blanking period of the video signal.
A pair of tracks recorded by a pair of heads having different azimuth angles to each other are handled as a pair, thereby the kind of associated information recorded in one frame of the video information is increased. For example, in the device in which the video signals in one frame are recorded as ten tracks, it is possible to record five kinds of associated information.
In addition, the most preference associated information is recorded in the sub-zone of the final track pair within one frame, thereby a compatibility of this with another device having other associated information recorded in the sub-zone other than the final track pair is kept.
In order to solve the aforesaid problems, the digital video and audio signal recording and reproducing device of the present invention is characterized in that it includes:
a recording format having a first recording area (VIDEO DATA recording area) for recording coded video signals, a second recording area (AUDIO DATA recording area) for recording the coded audio signals and a third recording area (VAUX DATA recording area) for recording the video associated data constituted in pack;
means for coding a video signal and recording it in said first recording area, and means for coding an audio signal and recording it in said second recording area;
means for constituting in pack the video associated information and the audio associated information inserted in a vertical blanking period of a video signal as they are, and recording them in the third recording area;
means for reproducing the coded video signal from the first recording area and decoding the video signal;
means for reproducing the coded video signal from the second recording area and decoding the audio signal; and
means for reproducing the video-associated information and the audio-associated information constituted in pack from said third recording area, reading out the associated information and superposing them to a vertical blanking period of the decoded video signal.
The video-associated information and the audio-associated information are constituted to record only the data part except a clock line or a start bit, thereby an amount of use in the third recording area can be saved.
In addition, a pack having a desired discriminating data (a pack header) is applied against the associated information inserted into a desired line, thereby it is possible that the line number is not stored in the data constituted in pack.
In addition, there is provided a fourth recording area (AAUX DATA recording area) for recording the audio-associated data so as to record the audio-associated information.
Each of the third recording area and the fourth recording area is constituted to have a main zone and a sub-zone, respectively;
the video-associated information and the audio-associated information are constituted in pack
Iizuka Ken
Oguro Masaki
Frommer William S.
Frommer & Lawrence & Haug LLP
Lee Young
Polito Bruno
Sony Corporation
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