Compressed data recording method using integral logical block size and physical block size ratios

DETAILED DESCRIPTION It is therefore an object of the present invention to provide a method of recording compressed and coded data, which is advantageous in improving the speed and ease of random accessing, and reducing the buffer capacity and facilitating control and editing in the reproducing system.
To achieve the above object, according to this invention, there is provided a compressed and coded data recording method for recording video signals on a recording medium in compressed and coded form, which method comprises the steps of compressing and coding video signals for every predetermined number of frames with an amount of codes per the predetermined number of frames being constant; storing the predetermined number of frames of compressed and coded video signals into at least one video packet; storing the video packet in a pack having a time slot corresponding to the predetermined number of frames; and recording the video signals on the recording medium in a pack stream containing such packs, with a relation between a size of the pack and a size of a logical block of the recording medium being set to 1:n (n is an integer) and a relation between the size of the pack and a size of a physical block of the recording medium being set to 2:m (m is an integer).
According to this method, the correlations between a predetermined number of frames of video signals to be recorded and the sizes of the logical block and physical block of the recording medium are well organized.
The compressed and coded data recording method of the present invention has another characteristic such that the video packet is stored at the end of a pack.
Therefore, the data packet and audio packet which contain small amounts of data have only to be delayed to be synchronous with the timing of reproducing the video packet, so that a buffer memory required for accomplishing this delay can have a small capacity.