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Device and method for digital data recording/rendition

A technology of digital data and recording device, applied in the field of variable speed recording and reproducing system, can solve the problems of image deterioration, loss of I frame data, etc.

Inactive Publication Date: 2004-03-31
SONY CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the I frame data corresponding to a specific part of the image plane will be lost during variable speed reproduction, which will degrade the image in variable speed reproduction mode

Method used

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  • Device and method for digital data recording/rendition
  • Device and method for digital data recording/rendition
  • Device and method for digital data recording/rendition

Examples

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Embodiment Construction

[0053] Fig. 1 shows a recording system of a digital VTR. Reference numeral 1 denotes an input terminal for receiving an analog video signal such as an NTSC television signal. This video signal is referred to herein as a standard video signal. This video signal is supplied to the A / D converter 2, which converts the received analog video signal into a digital video signal.

[0054] The A / D converter 2 supplies the converted video signal to the DCT compression circuit, and compresses the input video signal according to DCT compression technology and variable length coding. Specifically, the video signal from the A / D converter 2 is divided into shuffled blocks and DCT-converted. The DCT-converted data is buffered on a predetermined buffer unit basis. The DCT compression circuit uses one buffer unit according to one quantization table so that the total code amount is equal to or smaller than a predetermined value. This data is quantized with the preferred quantization table, an...

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Abstract

A digital VTR is capable of reproducing a recorded picture image in a normal mode and a variable speed reproduction mode. During normal speed reproduction, the digital VTR reproduces a recorded picture from data that has been recorded in a normal play area of a recording medium. When the digital VTR is in a variable low speed reproduction mode, it reproduces a picture from data recorded in a first trick play area. When the digital VTR is in a variable high speed reproduction mode, it reproduces a picture from data recorded in a second trick play area. The first and second trick play areas are located at respective tracks that correspond to different azimuths.

Description

technical field [0001] The present invention relates to a variable-speed recording and reproducing system used in a digital VTR, and in particular to such a variable-speed recording and reproducing system which performs data rate conversion on program data before recording and performs rate conversion on the rate-converted program during reproduction. The original time base information is reconstructed. The variable speed recording and reproducing system of the present invention is particularly suitable for recording such video signals in accordance with the MPEG2 format. Background technique [0002] In the above-mentioned digital VTR, a digital video signal is recorded on a magnetic tape after first being compressed according to DCT (Discrete Cosine Transform) technology, and is recorded according to variable length coding technology. This digital VTR can record video signals in two different modes. In the first mode, a digital VTR records television broadcast signals su...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N5/783G11B3/58G11B5/008G11B15/12G11B15/18G11B15/467G11B15/473G11B20/10G11B27/00G11B27/28G11B27/30H04N5/782H04N5/7826H04N5/92H04N5/926H04N7/24H04N7/52H04N7/56H04N7/62H04N9/79H04N9/797H04N9/804H04N9/82H04N21/41H04N21/43H04N21/432H04N21/433H04N21/434H04N21/4402
CPCH04N9/797H04N21/4402G11B2220/90G11B15/125G11B15/4671H04N9/8227H04N5/9262G11B3/58G11B15/4678G11B27/3027H04N21/4305H04N21/4344H04N21/4325G11B27/005H04N5/9264H04N9/8042H04N21/4135G11B5/0086H04N21/4302H04N9/7921G11B15/1875H04N5/78263G11B27/3036H04N7/56G11B27/3063H04N5/783G11B15/4733H04N21/4334G11B5/008
Inventor 柳原尚史
Owner SONY CORP