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Method and device for ensuring storage time for digital broadcast

a technology of digital broadcast and storage time, applied in the field of methods and devices for ensuring storage time for digital broadcast, can solve the problems of ensuring storage and recording time, and achieve the effect of high image quality and inexpensive provision

Inactive Publication Date: 2008-07-03
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0005]An object of the present invention is to provide a method and a device for ensuring the time for digital broadcasts transmitted at various bit-rates to be recorded in a storage medium.
[0029]As described above, in accordance with the present invention, even if the bit-rate of a digitized broadcast is varied, a required capacity of a storage medium at an original bit-rate of the broadcast is successively calculated. If the required capacity of the storage medium cannot be contained within an empty or freely limited area in the storage medium, the bit-rate of the broadcast is converted into a smaller one. Thus, the capacity of the storage medium required for the broadcast can be contained within the remaining storage capacity and the broadcast can be reliably stored and recorded in the storage medium.
[0030]Especially in the present invention, if the required capacity of the storage medium can be successfully contained within the remaining storage capacity, the transmission bit-rate of the broadcast is converted into a larger one and the resultant broadcast is stored in the storage medium. Thus, the broadcast can be stored and recorded with high image quality.
[0031]The present invention can be provided inexpensively because a re-compression processing is performed for a broadcast to be newly stored by utilizing existing devices in a storage-and-playback system.
[0032]Further, in accordance with the present invention, the required capacity of the storage medium is ensured in an empty area therein by deleting or re-compressing a broadcast which has been already stored in the storage medium. Thus, while maintaining at a bit-rate required for successfully maintaining a played back image, the broadcast to be newly stored can be reliably stored and recorded in the storage medium. In accordance with the present invention, among a plurality of already stored broadcasts, a broadcast that a set period of time has passed since its storage or a broadcast that is at least decoded or copied is preferentially deleted or re-compressed. As a result, the already stored broadcast can be deleted or re-compressed depending on a degree of necessity.

Problems solved by technology

Accordingly, a problem exists in the method for ensuring a storing and recording time.

Method used

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  • Method and device for ensuring storage time for digital broadcast

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Embodiment Construction

[0036]Preferred embodiments of the present invention will be described hereinafter with reference to the attached drawings.

[0037]FIG. 1 is a block diagram illustrating the specific structure of a device for ensuring storage time for digital broadcast relating to the embodiments of the present invention.

[0038]The device for ensuring storage time for digital broadcast illustrated in FIG. 1 is mainly configured by an input section 1, an MPEG transport decoder 17, a stream controller 6, an MPEG decoder 10, an image resolution / frame rate converter 9, an MPEG encoder 11, a drive section 16 and a microcomputer 14 for entirely controlling these elements.

[0039]Inputted to the input section 1 is a broadcast signal MPEG-TS 2 obtained by multiplexing at least one broadcast program inputted from a tuner section of a satellite, cable television or ground wave digital broadcasting, such as an MPEG-TS signal. The input section 1 outputs the multiplexed TS bit stream 3 to the MPEG transport decoder ...

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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.

Description

BACKGROUND OF THE INVENTION[0001]The present invention relates to a method and a device for ensuring storage time for digital broadcast that can ensure recording time required when a digital broadcast compressed by MPEG or the like is stored and recorded in a recording medium such as an optical disk, an optomagnetic disk or a hard disk.[0002]Recently, in accordance with improvement of image signal processing techniques, a record-and-playback device for recording in a disk-shaped storage medium that is capable of freely recording / playing back a video or voice digital signal, such as a DVD-RAM or a hard disk has been developed.[0003]As a method for storing and recording analog broadcast data in such a storage medium, for example, as disclosed in Japanese Patent Application Laid-Open (JP-A) No. 8-17137, there has been known a method that a target bit-rate is calculated on the basis of the storage capacity of the storage medium and a predetermined recording time and then the data is enc...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): H04N7/173G11B20/00G11B20/10G11B20/12G11B27/034G11B27/36H04N5/76H04N5/781H04N5/85H04N5/92H04N5/926H04N7/46H04N7/50H04N9/804
CPCG11B20/00007H04N19/59G11B27/034G11B27/36G11B2020/00079G11B2220/216G11B2220/218G11B2220/2541G11B2220/2562G11B2220/2575H04N5/4401H04N5/76H04N5/781H04N5/85H04N9/8042H04N21/234363H04N21/4424H04N19/46H04N19/15H04N19/61H04N19/132H04N19/146H04N19/587G11B20/10H04N21/426
Inventor MIYAGOSHI, EIJIWATABE, AKIHIRO
Owner PANASONIC CORP
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