Method and device for recording
AssigneeGrundig Multimedia B.V.
InventorThorsten Todtmann
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Abstract
The invention relates to a method and device for recording coded digital audio-visual data. On recording coded digital audio-visual data the problem occurred that predictions about the remaining available recording time on a mass storage medium being used were not possible because the applied coding causes the data rate of the coded digital audio-visual data to vary considerably. According to the invention, said problem may be avoided, whereby information on average data rates for programme sections is determined for the coded digital audio-visual data, which permits a prediction of the amounts of data to be expected for each programme section.
Claims18
Device for recording coded digital audiovisual data, which comprises the following:
- a mass storage medium (160) for recording coded audiovisual program data (123′) with a varying data rate, which represents a program contribution, in a storage area (123), a device (140) for continuous determination of an instantaneous data rate, to determine a mean data rate of the program data and to determine, based on the mean data rate, if the available storage capacity of the mass storage medium (160) is sufficient for the complete recording of the program data of the program contribution,
- characterized by the fact, that
- it furthermore comprises:
- a demultiplexer (120) for separation of the coded digital audiovisual program data (123′) with varying data rate, which represent a program contribution, from a transport data stream (110),
- a program information decoder (130) connected to the demultiplexer (120) for obtaining program information about the program contribution, and
- another storage area (143) provided in the mass storage medium (160), which is provided for storing the instantaneous data rates determined in the device (140).
Device according to one of the previous claims,
- characterized by the fact, that
- the storage medium (160) has another storage area (133) which is provided for storing the program information derived from the program information decoder (130).
Device according to one of the previous claims,
- characterized by the fact, that
- the device (140) is a microcomputer.
Device according to one of the previous claims,
- characterized by the fact, that
- the coded digital audiovisual data as well as the program data are coded according to MPEG.
Method for recording coded digital audiovisual data with the following steps:
- separation of coded digital audiovisual program data with a varying data rate, which represent a program contribution, from a transport data stream,
- further conducting the separated coded digital audiovisual program data with varying data rate to a mass storage medium (160),
- recording the separated coded digital audiovisual program data in a storage area (123) of the mass storage medium (160),
- decoding of program information about the program contribution derived from the transport data stream,
- continuous determination of an instantaneous data rate of the program contribution by evaluation of the program data and program information and continuous storage of the determined instantaneous data rates in another storage area (143) of the mass storage medium (160),
- determination of a mean data rate of the program contribution by evaluation of the instantaneous data rates, and
- based on the mean data rate, determination of whether the available storage capacity of mass storage medium is sufficient for complete recording of the program data of the program contribution.
Dependencies are inferred from the claim text.