Motion video signal processing for recording or reproducing – Local trick play processing – With randomly accessible medium
Reexamination Certificate
1999-04-02
2001-01-16
Chevalier, Robert (Department: 2715)
Motion video signal processing for recording or reproducing
Local trick play processing
With randomly accessible medium
C386S349000, C386S349000
Reexamination Certificate
active
06175684
ABSTRACT:
TECHNICAL FIELD
The present invention relates to a data transmitting apparatus which temporarily transfers AV data comprising audio data and video data stored in a library etc. to a predetermined recording apparatus and performs the transmission of that AV data using that transferred data.
BACKGROUND ART
In a broadcasting station, broadcast program data, for example commercials(CM) programs, etc. is usually stored in a library. The necessary broadcast program data is successively selected, reproduced, and transmitted from that library according to a broadcast schedule. This series of processing is controlled and managed by a control means called a library management system (LMS). Using this LMS, a library having data on an enormous number of CM programs recorded in a very large number of recording media, for example, several thousand video cassette tapes, is managed and suitably used for broadcasting CM programs.
However, usually, in a broadcasting station, to prevent any interruption of the broadcast, the system is configured so that important apparatuses such as said library are duplicated, and even if one breaks down, operation by the other is possible. However, such duplex provisions require double the cost. In particular, duplication of large scale apparatus such as said library for CM programs has a great economic influence.
Further, in such a multiplexed library system, it is necessary to select one series of data for actual broadcasting from the plurality of broadcast program data output. Normally, this selection is performed by the switching operator viewing the monitor to check the quality of the video and audio at the main switcher, but this work places a heavy burden on the switching operator.
DISCLOSURE OF THE INVENTION
The present invention has as its object to provide such a data transmitting apparatus for transmitting broadcast program data such as for CM programs which can ensure the same extent of reliability as that by the duplex provisions of a library by a simpler configuration, in other words, a lower cost. Further, it has as its object the provision of an apparatus which can eliminate or reduce the checking of the AV data by the operator and thereby lighten the work load.
In recent years, AV data is also being digitalized and broadcast program data is being recorded as digital data in a library etc. in many cases. If the broadcast program data is digital data, techniques such as error detection codes (error correction codes) which are often used in data transmission etc. can be applied. Namely, by comparing the error detection codes produced with respect to AV data before and after the transfer, whether or not the AV data are equivalent can be checked. Further, it is possible the check the quality of the AV data by using the error rate and therefore upgrade the reliability.
Accordingly, a data transmitting apparatus of the present invention comprises a reproducing means for storing AV data comprised of at least one of video data and audio data and reproducing the stored AV data, a temporary recording means for temporarily recording the AV data reproduced by said reproducing means, a control means for controlling said reproducing means and said temporary recording means, a first error state detecting means for detecting an error state of the AV data reproduced by said reproducing means and outputting a first error detection signal, a second error state detecting means for detecting an error state of the AV data reproduced by said temporary recording means and outputting a second error detection signal, a transfer checking means for deciding that the transfer of the AV data from said reproducing means to said temporary recording means was suitably carried out when said first error detection signal and said second error detection signal are equal, and a data transmitting means for reproducing and transmitting the AV data suitably transferred to and recorded in said temporary recording means.
Preferably, when said transfer checking means decides that said first error detection signal and said second error detection signal are different, said control means controls said reproducing means and said temporary recording means so as to again carry out the transfer of said AV data from said reproducing means to said temporary recording means.
Specifically, it further comprises an input means for inputting transmission scheduling data showing the transmission schedule of said AV data, and said control means controls said reproducing means and said temporary recording means based on said transmission scheduling data so that said data is transferred from said reproducing means to said temporary recording means before the scheduled time of broadcast of said AV data.
More preferably, it comprises a first transmission line connecting said reproducing means and said temporary recording means and a second transmission line connecting the first error state detecting means and the transfer checking means, and the second error state detecting means and the transfer checking means each, on the first transmission line being transmitted fixed length data packets having a first data portion including the video data for each horizontal line's worth of the video data and a second data portion including the audio data corresponding to the video data and predetermined auxiliary data, and on the second transmission line being transmitted at least said first error detection signal and said second error detection signal.
Specifically, said first transmission line is a transmission line which can transmit said AV data by a first transmission rate, and said second transmission line is a transmission line which can transmit said first error detection signal and said second error detection signal at a second transmission rate slower than said first transmission rate.
More preferably, said temporary recording means comprises a plurality of recording means, said control means controls said reproducing means and said temporary recording means so that the same data reproduced by said reproducing means is recorded in each of said plurality of recording means, said second error detecting means detects said error state for each of the AV data reproduced by said plurality of recording means and outputs a plurality of second error detection signals, and said transfer checking means decides that the transfer of the AV data from said reproducing means to said temporary recording means has been suitably performed when the first error detection signal and the plurality of second error detection signals are all equal.
Preferably, said data transmitting means comprises a data selecting means for selecting and transmitting one series of AV data from a plurality of series of AV data reproduced by said plurality of recording means under the control of said control means.
More preferably, said data selecting means comprises an error rate detecting means for detecting the error rates of each of the AV data reproduced by the plurality of recording means and the AV data with the lowest error rate is selected based on the results of detection of said error rate detecting means.
In such a data transmitting apparatus of the present invention, the library means storing a plurality of types of AV data preliminarily reproduces and outputs the AV data scheduled to be transmitted and records it in the temporary recording means. At this time, a predetermined error detection code is found in the first code computing means for the AV data reproduced in the library means. Also, the AV data recorded in the temporary recording means is immediately subjected to test reproduction and a predetermined error detection code the same as that of said first code computing means is found by the second code computing means. Then, the error detection code found by said first code computing means and the error detection code found by said second code computing means are compared by the transfer check means. Where they are equal, it is decided that the transfer of the AV data from said library means to said temporary recording means
Chevalier Robert
Frommer William S.
Frommer Lawrence & Haug LLP.
Kessler Gordon
Sony Corporation
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