Method and device for ensuring storage time for digital broadcast
First Claim
1. A method for ensuring a storage time for digital broadcast at the time of storing broadcast data transmitted in a state of being digitized and compressed, comprising the steps of:
- monitoring a predetermined recording time for the broadcast and a bit-rate of the broadcast in the compressed state and calculating, in real time, a required capacity of a storage medium;
determining whether or not said calculated required capacity of the storage medium can be contained within an empty area or a freely limited area of the storage medium;
if said calculated required capacity of the storage medium cannot be contained as the result of said determination, converting, in real time, said bit-rate of the broadcast into a smaller one by decoding and then re-compressing the broadcast data in the compressed state; and
storing said converted broadcast in said storage medium.
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Accused Products
Abstract
When a digitized broadcast is recorded in a storage medium, a required capacity of the storage medium is firstly calculated on the basis of a bit-rate of digitized broadcast data and a recording time which is known in advance. If the remaining capacity of the storage medium is smaller than the required capacity of the storage medium, for example, a frame rate decimation and pixel reduction are performed upon a broadcast to be newly stored, a re-encoding processing is performed for the broadcast and then the resultant broadcast is stored in the storage medium. If the remaining storage capacity of the storage medium is larger than the required capacity of the storage medium and thus remains, a frame interpolation and pixel interpolation are performed for the broadcast to be stored and then a re-encoding processing is performed for the resultant broadcast in order to improve its image quality. As a result, recording of the broadcast data in the storage medium can be ensured.
28 Citations
27 Claims
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1. A method for ensuring a storage time for digital broadcast at the time of storing broadcast data transmitted in a state of being digitized and compressed, comprising the steps of:
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monitoring a predetermined recording time for the broadcast and a bit-rate of the broadcast in the compressed state and calculating, in real time, a required capacity of a storage medium; determining whether or not said calculated required capacity of the storage medium can be contained within an empty area or a freely limited area of the storage medium; if said calculated required capacity of the storage medium cannot be contained as the result of said determination, converting, in real time, said bit-rate of the broadcast into a smaller one by decoding and then re-compressing the broadcast data in the compressed state; and storing said converted broadcast in said storage medium. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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22. A device for ensuring a storage time for digital broadcast at the time of storing broadcast data transmitted in a state of being digitized and compressed comprising:
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a required capacity calculation circuit for monitoring a predetermined recording time of the broadcast and a bit-rate of the broadcast in the compressed state and calculating, in real time, a required capacity of the storage medium; a determination circuit for determining whether or not the required capacity of the storage medium calculated in said required capacity calculation circuit can be contained within an empty or freely limited area in the storage medium; and a bit-rate conversion circuit for, if said calculated required capacity of the storage medium cannot be contained as the result of said determination by said determination circuit, converting, in real time, said bit-rate of the broadcast into a smaller one by decoding and then re-compressing the broadcast data in the compressed state and storing the converted broadcast in said storage medium. - View Dependent Claims (23, 24, 25, 26, 27)
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Specification