Motion video signal processing for recording or reproducing – Local trick play processing – With randomly accessible medium
Reexamination Certificate
1999-12-20
2002-12-24
Tran, Thai (Department: 2615)
Motion video signal processing for recording or reproducing
Local trick play processing
With randomly accessible medium
C386S349000, C360S013000, C369S083000
Reexamination Certificate
active
06498894
ABSTRACT:
BACKGROUND OF THE INVENTIONS
1. Field of the Invention
The present invention relates to an audio and/or video data recording and reproduction apparatus for recording video data of the digital format and reproducing the recorded audio and/or video data.
2. Description of the Related Art
For example, in a television broadcasting station, a video to be telecast in a news program etc. is usually produced by recording and individually managing the video (stock video) and audio serving as the basis of the video to be telecast by a TV camera etc. including a video tape recorder (VTR) on video tapes and having an editor use a VTR in the editing room according to need to reproduce one or more of the audio and/or video data (AV data) recorded on the video tapes and combining the reproduced stock videos to record the video to be actually broadcast on another tape.
However, when the stock videos are managed in the state recorded on video tapes, the work efficiency in selecting the necessary videos from among the large number of stock videos becomes poor. Further, there also exists a need to convey the tapes on which the stock videos are recorded from the storage place to the editing room. Further, it is difficult for a number of editors to use the same stock videos. Such a problem is particularly notable when a large number of stock videos are used for the production of one news video.
Further, the news video produced on the tape is generally carried to and load by hand into a VTR for transmitting the program or a cart machine containing the VTR for transmitting the program. However, since it is necessary to perform the operations such as management of the news videos or changing the order of transmission at the stage of transmitting the program by hand, the efficiency is poor and mistakes can occur due to human error, so the system lacks reliability.
In order to solve such a problem, use is made of a so-called server system as used in a computing system for enabling centralized management and use of the stock videos or the videos for broadcast and therefore shared use of stock videos.
FIG. 1
is a view of an example of the configuration of a example of a server system
8
for audio and/or video data.
As shown in
FIG. 1
, the server system
8
is basically configured by the basic component elements of the computer, that is, a CPU
401
, ROM
402
, RAM
403
, high speed bus
404
, device interfaces
405
m
, data recording and reproduction apparatuses
406
m
connected via the same, input/output interfaces
407
n
, audio and/or video data compressing means
408
n
connected via the same, and audio and/or video data expanding means
409
n
corresponding to the audio and/or video data compressing means
408
n
.
Further, where the server system
8
is realized on a computer different from the host application system, a LAN use interface
411
connecting a LAN
410
and the server system
8
is provided.
When the server system
8
records the audio and/or video data, the audio and/or video data compressing means
408
n
compress the input audio and/or video data S
40
n
to generate the compressed audio and/or video data S
41
n
and transfer the same via the input/output interfaces
407
n
to the high speed bus
404
.
The compressed audio and/or video data transferred to the high speed bus
404
are usually temporarily stored (buffered) in the RAM
403
for the data flow rate control etc. and then transferred to the bus
404
again and appropriately recorded in the data recording and reproduction apparatuses
406
m
via the device interfaces
405
m
.
Further, when the server system
8
reproduces the audio and/or video data, the compressed audio and/or video data recorded in the data recording and reproduction apparatuses
406
n
, are reproduced and then transferred via the device interfaces
405
m
to the high speed bus
404
.
The compressed audio and/or video data transferred to the high speed bus
404
are buffered in the RAM
403
for the data flow rate control etc. in the same way as that at the recording, transferred again to the high speed bus
404
, pass through the input/output interfaces
407
n
, and become the input data S
42
n
to the audio and/or video data expanding means
409
n
.
The audio and/or video data expanding means
409
n
decode the video signals S
43
n
from the input data S
42
n
and output the same from the system.
When the server system
8
records and reproduces the audio and/or video data, the operations of all of the input/output interfaces
407
n
, the high speed bus
404
, and the device interfaces
405
m
are controlled by the CPU
401
based on the commands transferred from the application system via the LAN
410
, LAN use interface
411
, high speed bus
404
, and RAM
403
.
Note that, where the operation commands are supplied from not the application system, but from the input/output side of the video signal, control lines S
44
n
connected to the input/output interfaces
407
n
as indicated by the broken lines in
FIG. 1
become necessary. In this case, the commands supplied from the control lines S
44
n
are communicated to the CPU
401
via the input/output interfaces
407
n
, the high speed bus
404
, and the RAM
403
, and the CPU
401
controls the operation of the input/output interfaces
407
n
, high speed bus
404
, and the device interfaces
405
m
based on the commands supplied from the control lines S
44
n
.
FIG. 2
is a view of the configuration of an editing system
9
using the server system
8
shown in FIG.
1
.
When audio and/or video data are edited by using the server system
8
, as shown in for example
FIG. 2
, use is made of an editing system
9
comprised of editing apparatuses
90
1
and
90
2
, connected to a server system
8
, each of which having two audio and/or video data input terminals and one audio and/or video output terminal (AV) and a control signal terminal (C) corresponding to each of these audio and/or video signal input/output terminals and performing cutting to connect a plurality of audio and/or video data or addition of special effects to the audio and/or video data. The editor edits the audio and/or video data supplied from the server system
8
by using the editing apparatuses
90
1
and
90
2
and records the result in the server system
8
again.
However, the server system
8
shown in
FIG. 1
is not always suitable for recording and reproducing the high quality audio and/or video data of a television broadcasting station. The reason for this will be explained below.
First, if the server system
8
were to handle the high quality audio and/or video data of a level as used in a television broadcasting station, the data transfer capability of its bus would be insufficient and the system size or an expansion property of the system would be limited.
That is, the data rate of the current digital format of the television audio and/or video data is 100 Mbps or more. Also, the coded audio and/or video data obtained by high efficient coding of this audio and/or video data has a data rate of about 30 Mbps (4 MBps), as disclosed in for example the CCIR recommendation
723
, taking the deterioration due to the editing into account.
For example, if trying to allow eight editors to simultaneously perform editing (so-called AB roll editing) using two stock videos of 30 Mbps (4 MBps) in the server system
8
, when taking the necessity of buffering the audio and/or video data as mentioned above into account, as much as 48 [=3 (due to the necessity of simultaneously reproducing two stock videos and recording one video after editing)×2 (reciprocation for buffering)×8 (number of editors)] series of coded audio and/or video data would be simultaneously transferred on the high speed bus
404
. Accordingly, an effective data transfer rate of 192 Mbps at the lowest would be required for just the transfer of the coded audio and/or video data to the high speed bus
404
.
Further, when transferring the audio and/or video data to the input/output interfaces
407
n
, there is a limitation inherent in the serve
Fujita Hiroyuki
Ito Norikazu
Kojima Yuichi
Frommer William S.
Frommer & Lawrence & Haug LLP
Smid Dennis M.
Sony Corporation
Tran Thai
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