Data recording and reproducing methods

Claim 2

The data recording method according to claim 1 comprising using a disc-shaped recording medium as said recording medium, supplying compressed data to said recording head by means of said memory means, said compressed data being continuous data compressed in time by 1/N, rotating said disc-shaped recording medium at a notational velocity which is approximately N times the rotational velocity corresponding to the transfer rate of said compressed data, and recording data on said disc-shaped recording medium whilst said disc-shaped recording medium is rotated at a rotational velocity which is approximately N times the rotational velocity corresponding to the transfer rate of said compressed data.

Claim 3

The data recording method according to claims 1 or 2 wherein said recording head is shifted to a new recording start position on said recording medium when again performing data recording after discontinuing data recording on said recording medium.

Claim 4

The data recording method according to claim 3 wherein said recording head scans the same track during the time when the operation of data recording on said recording medium by said recording head is discontinued.

Claim 5

The data recording method according to claim 4 wherein the predetermined amount of the compressed data read out from said memory means is approximately an amount recorded on one track.

Claim 6

The data recording method according to claim 3 wherein data recorded on said recording medium are reproduced during the time when the operation of data recording on said recording medium is discontinued.

Claim 7

The data recording method according to claim 6 wherein data reproduced during the time when the operation of data recording on said recording medium are data continuously recorded immediately before said operation of data recording is discontinued

Claim 8

A data recording method for recording data on a recording medium comprising performing a data recording by switching a recording mode between a first recording mode and a second recording mode, said first recording mode being a recording mode in which compressed data which are continuous data compressed in time are stored in memory means, a predetermined amount of said compressed data stored in said memory means are read out continuously and supplied to a recording head so as to be recorded on said recording medium, and the operation of data recording on said recording medium is discontinued during the time which elapses since recording of said predetermined amount of said compressed data on said recording medium until storage of a predetermined amount of said compressed data in said memory means a second time and readout thereof, said second recording mode being a recording mode in which the compressed data which are the continuous data compressed in time are directly supplied to said recording head so as to be recorded on said recording medium, and recording identification data indicating a recording mode for each of the compressed data.

Claim 9

The data recording method according to claim 8 comprising using a disc-shaped recording medium as said recording medium, supplying compressed data to said recording head by means of said memory means, said compressed data being continuous data compressed in time by 1/N, and recording data on said disc-shaped recording medium while said disc-shaped recording medium is rotated at a rotational velocity which is approximately N times the rotational velocity corresponding to the transfer rate of said compressed data.

Claim 10

The data recording method according to claim 8 or 9 further comprising shifting said recording head to a new recording start position on said recording medium in said first recording mode when performing an operation of data recording again after the operation of data recording on said recording medium is discontinued.

Claim 11

The data recording method according to claim 10 wherein said identification data also indicate a compression ratio of said compressed data.

Claim 12

The data recording method according to claim 10 wherein said recording head scans the same track when the operation of data recording on said recording medium is discontinued in said first recording mode.

Claim 13

The data recording method according to claim 12 wherein the predetermined amount of the compressed data read out from said memory means in said first recording mode is approximately an amount recorded on one track.

Claim 14

The data recording method according to claim 10 wherein data already recorded on said recording medium are reproduced in said first recording mode during the time when the operation of data recording on said recording medium is discontinued.

Claim 15

The data recording method according to claim 14 wherein data reproduced during the time when the operation of data recording on said recording medium is discontinued in the first recording mode are data continuously recorded immediately before said operation of data recording is discontinued.

Claim 16

A data reproducing method for reproducing data from a recording medium on which compressed data compressed in time are recorded continuously, comprising scanning said recording medium by a reproducing head for reading out compressed data, expanding a predetermined amount of the compressed data thus read out in time and outputting expanded data, and discontinuing the reading operation of the compressed data from said recording medium during the time which elapses since readout of said predetermined amount of said compressed data until outputting of the compressed data from said recording medium.

Claim 17

The data reproducing method according to claim 16 comprising using as said recording medium a disc-shaped recording medium on which compressed data which are continuous data compressed by 1/N in time, are continuously recorded, reproducing data from said disc-shaped recording medium while said disc-shaped recording medium is rotated at a rotational velocity which is approximately N time the rotational velocity corresponding to the transfer rate of said compressed data.

Claim 18

The data reproducing method according to claim 16 or 17 wherein said reproducing head is shifted to a new recording start position on said recording medium when the reading operation is again performed after the reading operation from said recording medium is discontinued.

Claim 19

The reproducing method according to claim 18 wherein said reproducing head scans the same track during the time when the reading operation from said recording medium is discontinued.

Claim 20

The data reproducing method according to claim 19 wherein said predetermined amount of the compressed data read out from said recording medium is approximately an amount recorded on one track.

Claim 21

A data reproducing method for reproducing data from a recording medium on which an area of a first recording mode in which compressed data compressed in time are recorded continuously and an area of a second recording mode in which compressed data are recorded in a burst fashion exist together and on which identification data indicating the recording mode for the compressed data for these areas are recorded comprising scanning said recording medium by a reproducing head for reading out the compressed data and storing the compressed data thus read out in memory means, expanding a predetermined amount of the compressed data stored in said memory means in time and continuously outputting expanded data, detecting identification data for the compressed data thus read out, and discontinuing the operation of writing the compressed data in said memory means, during the time which elapses since said predetermined amount of said compressed data are stored in said memory means until data expanded in time are outputted, when said compressed data read out by said identification data are detected to be the data of the area of said first recording mode.

Claim 22

The data reproducing method according to claim 21 comprising using a disc-shaped recording medium on which are recorded compressed data which are continuous data compressed by 1/N as said recording medium, and reproducing data from said disc-shaped recording medium while said disc-shaped recording medium is rotated at a rotational velocity which is approximately N times the rotational velocity corresponding to the transfer rate of said compressed data.

Claim 23

The data reproducing method according to claim 21 or 22 further comprising shifting said reproducing head to a new recording start position on said recording medium when a write operation is performed again after the operation of writing the compressed data in said memory means is discontinued.