Motion video signal processing for recording or reproducing – Local trick play processing – With randomly accessible medium
Reexamination Certificate
1997-11-14
2001-11-13
Garber, Wendy R. (Department: 2615)
Motion video signal processing for recording or reproducing
Local trick play processing
With randomly accessible medium
C360S048000, C369S059160, C386S349000, C386S349000
Reexamination Certificate
active
06317558
ABSTRACT:
BACKGROUND OF THE INVENTION
The invention relates to recording of binary data sequences and, more particularly, to the recording of binary data sequences using digital video recorders.
The invention applies more particularly to the professional field in which the digital data in question are video and/or audio data.
It is possible to record binary data sequences either using digital recorders or using digital video recorders.
Digital recorders are very expensive. Digital video recorders are used in order to reduce cost.
However, the use of digital video recorders has a number of drawbacks. Specifically, if N is the number of bits over which the video and/or audio data are coded, it is known that, in digital video recorders, the end combinations, the decimal representation of which is 0 and 2
N−1
, are reserved for the synchronization words.
As is known to the person skilled in the art, this allocation of the end combinations 0 and 2
N−1
to the synchronization words is due to the 4:2:2 video format.
In the rest of the description, the end combinations will also be referred to as forbidden combinations.
According to the prior art, it is known to use digital coders in order to remove the forbidden combinations 0 and 2
N−1
on input to digital video recorders.
Prior art digital coders lead to a relatively large reduction in the information rate. By way of example, coders using 8/9 coding entail a rate reduction of the order of 10%. A rate reduction of this type very substantially reduces the number of data which the video recorder can record.
The invention does not have this drawback.
SUMMARY OF THE INVENTION
The present invention relates to a digital coder for converting a succession of video and/or audio blocks, consisting of binary combinations of N bits, into a succession of binary data blocks consisting of combinations of N bits, each binary data block corresponding to one video and/or audio block. The coder comprises means for coding each end binary combination 0 or 2
N−1
of each video and/or audio block in the form of a coded binary combination consisting of a nature information item (In) giving the nature 0 or 2
N−1
of the end binary combination and of a position information item (Ip) giving the position which the end binary combination occupies in the video block.
As will be seen below, the means for coding each end binary combination 0 or 2
N−1
of each video and/or audio block comprise a detector for detecting the presence of an end binary combination in a video and/or audio block and for generating the information item (In) giving the nature of the detected end binary combination, and a counting circuit for generating the position information item (Ip) of this end binary combination.
The coder according to the invention also comprises means for sequencing the binary combinations which it generates.
The present invention also relates to a digital decoder for reconstructing a succession of video and/or audio blocks, consisting of binary combinations of N bits, from a succession of binary data blocks consisting of binary combinations of N bits. The decoder comprises means for extracting, for each binary data block which it receives, coded binary combinations corresponding to end binary combinations 0 or 2
N−1
of a video and/or audio block, said coded binary combinations consisting of a nature information item (In) giving the nature 0 or 2
N−1
which a binary combination of a video and/or audio block must take, and a position information item (Ip) giving the position which said binary combination must occupy in said video and/or audio block.
The invention further relates to a recording/reading system consisting of the combination of a coder according to the invention, a digital video recorder and a decoder according to the invention.
One advantage of the coder according to the invention consists in reducing the rate of the data constituting the binary data sequence which it generates to a much lesser extent than according to the prior art.
Other characteristics and advantages of the invention will emerge from reading a preferred embodiment which is given with reference to the appended figures, in which:
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patent: 4729043 (1988-03-01), Worth
patent: 4853796 (1989-08-01), Suesada et al.
patent: 5333126 (1994-07-01), Fukuda et al.
patent: 5487019 (1996-01-01), Ueta et al.
patent: 5848220 (1998-12-01), Henmi et al.
Bourdon François
Chapel Claude
Quintard Jean-Yves
Boccio Vincent F.
Davenport Francis A.
Fried Harvey D.
Garber Wendy R.
Thomson Licensing S.A.
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