Information signal recording device and its reproduction device

Abstract

A video disk recorder (100) is such an apparatus as to compresses a video signal contained in a television signal at a predetermined compression rate to record it on an optical disk (1), and then play back the recorded signal. In such a video disk recorder (100), the television signal being input into a signal inputting portion is then compressed by a variable-rate encoder (4), and then sent out to a recording / playing portion (3). The signal sent out to the recording / playing portion (3) is then recorded on an optical disk (1). In particular, the video disk recorder (100) has a probability calculating portion (5) for weighting signals according to degree of importance of the contents of the television signals, and a controlling portion (6) for varying the compression rate in compliance with the weight.

Description

technical field [0001] The present invention relates to an information signal recording and reproducing device for recording and reproducing information signals composed of images and sounds on a recording medium such as a DVD, and particularly relates to compressing image information at a prescribed rate in an MPEG compression variable transmission rate method. A video disc recorder for recording and reproducing, etc. Background technique [0002] In recent years, information signal recording and reproducing devices such as DVDs that compress information signals such as television signals using, for example, an MPEG compression variable slew rate method, record and reproduce them, have appeared. The DVD records information signals on a disc with a diameter of 12CM and a recording capacity of 4.7GB through a variable rate method, which can not only record large capacity, but also has excellent random access, so it has the ability to record any part of the recording area. Ad...

AI Technical Summary

Problems solved by technology

[0009] However, these technologies only determine the compression rate through prediction, so when the prediction deviates, it may appear that even if the program is not over, the remaining amount of the disk becomes very small, and when the content of the program increases, the image becomes complicated. , when the motion of the subject is more intense, in order to reduce the bit rate, the compression rate has to be increased, which may result in deterioration of image quality

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