Motion video signal processing for recording or reproducing – Local trick play processing – With randomly accessible medium
Reexamination Certificate
1995-02-08
2001-09-11
Faber, Alan T. (Department: 2651)
Motion video signal processing for recording or reproducing
Local trick play processing
With randomly accessible medium
C386S349000, C360S018000, C360S134000
Reexamination Certificate
active
06289171
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field Of The Invention
The invention relates to an arrangement for recording a digital video signal and a corresponding digital audio signal in slant tracks on a longitudinal magnetic record carrier, tracks comprising an audio signal recording sector and a video signal recording sector, for storing the digital audio signal and the digital video signal respectively, the arrangement comprising
first and second input terminals for receiving the digital audio signal and the digital video signal respectively,
conversion means for converting the digital audio- and video signals so as to obtain a composite signal which can be recorded on the record carrier,
recording means for the recording of the converted audio- and video signals in said composite signal in the audio signal recording sector and the video signal recording sector respectively of a track, the video signal recording sector in a track further comprising an auxiliary signal recording part for storing an auxiliary signal. The invention also relates to an arrangement for reproducing a digital video signal and a corresponding digital audio signal from a longitudinal magnetic record carrier, signals being recorded in slant tracks on a longitudinal magnetic record carrier, tracks comprising an audio signal recording sector and a video signal recording sector, in which a first information signal relating to the digital audio signal and a second information signal relating to the digital video signal respectively are stored, the video signal recording sector in a track further comprising an auxiliary signal recording part in which a third information signal representing an auxiliary signal can be stored, the arrangement comprising,
reading means for reading the signals recorded in the tracks, and for retrieving the first and second information signal originally stored in the audio signal recording sector and the video signal recording sector respectively in a track,
reconversion means for reconverting the first information signal and the second information signal into a reproduced digital audio- and video signal respectively,
first and second output terminals for supplying the reproduced digital audio signal and
2. Description Of The Related Art
A recording arrangement as described in the opening paragraph is known from European Patent Application EP-A 492,704, corresponding to U.S. Pat. No. 5,245,483, document (1) in the list of references.
The known arrangement records a digital audio signal and a digital video signal in audio signal recording sectors and video signal recording sectors, respectively, where, when recording a track, the video signal recording sector in a track comes first and is followed by the audio signal recording sector. The order in which the sectors occur in a track can, however, also be in the reverse order. Further, other sectors may be included in a track, such as a clock run-in area located at the beginning of a track, so as to enable a locking-in of the internal system clock on the signals read from the track, and preamble and postamble areas that are located between the various sectors and function as an edit gap. Reference is made in this respect to the earlier filed European patent applications no. 93,202,950, corresponding to U.S. patent application Ser. No. 08/127,233, filed Sep. 27, 1993, now U.S. Pat. No. 5,424,878, reference (2) in the list of references and no. 93,201,263, corresponding to U.S. patent application Ser. No. 08/185,638, filed Jan. 24, 1994, and now U.S. Pat. No. 5,400,187 reference (3) in the list of documents.
The video signal recording sector includes an auxiliary signal recording part for storing an auxiliary signal. This auxiliary signal can be teletext data or control data.
Both references (2) and (3) mentioned above mention the possibility of carrying out an editing function on the signals stored in the audio signal recording sector and/or the video signal recording sector.
SUMMARY OF THE INVENTION
The invention aims at improving the editing possibilities. To that purpose, the arrangement given in the opening paragraph is characterized in that the arrangement is further adapted to store the digital audio signal in the auxiliary signal recording parts of the video signal recording sectors in the tracks.
The invention is based on the recognition that editing of the audio signal recording sector means that the signals stored in the audio signal recording sector are overwritten by another audio signal. As a consequence, the original audio signal that corresponds to the video signal recorded in the video signal recording sector is lost. In accordance with the invention, the original audio signal is also recorded in the auxiliary signal recording part of the video signal recording sector. A subsequent editing of the audio signal, means that only the contents of the audio signal recording sector is affected, the contents of the video signal recording sector however remains unaffected. As a result, an edited version of the original recording has been obtained, while the original audio signal is still available for further editing or reviewing functions.
The recording arrangement may be further characterized in that the conversion means are further adapted to convert the digital audio signal into a second converted digital audio signal so as to obtain the composite signal and the recording means further being adapted to record the second converted audio signal included in said composite signal in said auxiliary signal recording parts of the video signal recording sectors in the tracks. More specifically, in that the conversion means comprise data compression means for data reducing the digital audio signal so as to obtain the second converted digital audio signal. This for the reason that the auxiliary signal recording part of the video signal recording sector may have an insufficient storage capacity to store the audio signal in uncompressed form. Data compression to be carried out can be done in various ways. One data compression technique that has proven to be of high quality is the data compression technique applied in the DCC digital compact cassette system. Reference is made in this respect to various publications in the literature and patent publications, such as European patent application no. 402,973 corresponding to U.S. Pat. No. 5,323,396, document (4) in the list of references, European patent application no. 457.390 corresponding to U.S. Pat. No. 5,367,608, document (5) in the list of references, and European patent application no. 457.391 corresponding to U.S. Pat. No. 5,365,553, document (6) in the list of references. Another example is the compression algorithm carried out in the 8 mm PCM audio recording system.
The recording arrangement may be further characterized in that the arrangement is adapted to generate an indicator signal indicating that the auxiliary signal recorded in the auxiliary signal recording parts of the video signal recording sectors in the tracks is an audio signal corresponding to the digital video signal recorded in the video signal recording sectors, signal combining means being present to combine the indicator signal into the composite signal for recording in the tracks. In this way, a reproducing arrangement for reproducing the information recorded on the longitudinal record carrier by means of the above described recording arrangement, is capable of retrieving the audio signal from the auxiliary signal recording part of the video signal recording sectors in the tracks.
It will be clear that the invention is of great importance in camcorders, as the loss of the original audio information of personally made recordings during editing is not wanted.
REFERENCES:
patent: 4353098 (1982-10-01), Heinz
patent: 4530015 (1985-07-01), Yanagida
patent: 5012352 (1991-04-01), Yoshimura
patent: 5121259 (1992-06-01), Yamashita
patent: 5245483 (1993-09-01), Van Gestel
patent: 5323396 (1994-06-01), Lokhoff
patent: 5359464 (1994-10-01), Wilkinson
patent: 5365553 (1994-11-01), Veldhuis et al.
patent: 5367608 (1994-11-01), Veld
Faber Alan T.
Goodman Edward W.
U. S. Philips Corporation
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