Remaining recordable time calculation apparatus that converts amount of free area of recording medium into time
First Claim
1. A remaining recordable time calculation apparatus that calculates remaining recordable time of a recording medium, the recording medium containing one or more video streams and corresponding management information, and the one or more video streams being compressed when recorded on the recording medium, the remaining recordable time calculation apparatus comprising:
- management data read means for reading a capacity of the recording medium and data sizes of the one or more video streams;
calculation parameter holding means for holding the following calculation parameters, (1) an estimate error value for estimating at least one of;
an estimate error occurring during compression of a video stream, and a size of an unrecordable area inherent in the recording medium, (2) a standard bit rate being a bit rate used in compressing a video stream to be recorded on the recording medium; and
time calculation means for calculating the remaining recordable time by dividing a free area size of the recording medium by the standard bit rate, where the free area size is obtained by subtracting the data sizes of the one or more video streams and the estimate error value from the capacity of the recording medium.
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Accused Products
Abstract
To provide users with reliable remaining recordable time of a recording medium, calculation for the remaining recordable time is performed by dividing a free area size of the recording medium by a standard bit rate used for compressing video streams, where the free area size is obtained by subtracting an amount of already recorded stream data in the recording medium and an estimate error value from a capacity of the recording medium.
27 Citations
20 Claims
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1. A remaining recordable time calculation apparatus that calculates remaining recordable time of a recording medium, the recording medium containing one or more video streams and corresponding management information, and the one or more video streams being compressed when recorded on the recording medium,
the remaining recordable time calculation apparatus comprising: -
management data read means for reading a capacity of the recording medium and data sizes of the one or more video streams;
calculation parameter holding means for holding the following calculation parameters, (1) an estimate error value for estimating at least one of;
an estimate error occurring during compression of a video stream, and a size of an unrecordable area inherent in the recording medium,(2) a standard bit rate being a bit rate used in compressing a video stream to be recorded on the recording medium; and
time calculation means for calculating the remaining recordable time by dividing a free area size of the recording medium by the standard bit rate, where the free area size is obtained by subtracting the data sizes of the one or more video streams and the estimate error value from the capacity of the recording medium. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A remaining recordable time calculation apparatus that calculates remaining recordable time of a recording medium, the recording medium containing one or more video streams and corresponding management information, and the one or more video streams being compressed when recorded on the recording medium,
the remaining recordable time calculation apparatus comprising: -
management data read means for reading, from the recording medium, running time of the one or more video streams;
total time holding means for holding a total time period for which recording is possible on the recording medium, hereinafter referred to as ‘
the total time’
, the total time being obtained by first subtracting an estimate error value from a capacity of the recording medium, and then by dividing the subtraction result by a standard bit rate,wherein an estimate error value estimating at least one of;
an estimate error occurring during compression of a video stream, and a size of an unrecordable area inherent in the recording medium, and the standard bit rate is a bit rate used in compressing a video stream to be recorded on the recording medium; and
time calculation means for calculating the remaining recordable time by subtracting the running time of the one or more video streams from the total time. - View Dependent Claims (8, 9, 10, 11, 12, 13)
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14. A remaining recordable time calculation apparatus that calculates remaining recordable time of a recording medium, the recording medium containing one or more video streams and corresponding management information, and the one or more video streams being compressed when recorded on the recording medium,
the remaining recordable time calculation apparatus comprising: -
management data read means for reading, from the recording medium, a capacity of the recording medium and data sizes and running time of the one or more video streams;
calculation parameter holding means for holding the following calculation parameters, (1) an estimate error value estimating at least one of;
an estimate error occurring during compression of a video stream, and a size of an unrecordable area inherent in the recording medium,(2) a standard bit rate being a bit rate used in compressing a video stream to be recorded on the recording medium;
total time holding means for holding a total time period for which recording is possible on the recording medium, hereinafter referred to as ‘
the total time’
, where the total time is obtained by first subtracting the estimate error value from the capacity of the recording medium and then by dividing the subtracted result by the standard bit rate;
first time calculation means for calculating first remaining recordable time by dividing a free area size of a recording medium by the standard bit rate, where the free area size is obtained by subtracting the data sizes and the estimate error value from the capacity of the recording medium;
second time calculation means for calculating second remaining recordable time by subtracting the running time from the total time; and
select means for selecting a shorter one of the first and the second remaining recordable time, so as to present the shorter time as the remaining recordable time to users. - View Dependent Claims (15, 16, 17, 18, 19, 20)
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Specification