Data recording method and data reproducing apparatus

A data reproducing method for reproducing data by scanning a disc-shaped recording medium by a reproducing head, said method comprising the steps of:

• rotationally driving said disc-shaped recording medium at a velocity equal to N times a rotational velocity of the recording medium corresponding to a transfer rate of data recorded on said disc-shaped recording medium, N being a real number larger than unity,
• scanning a same position on said disc-shaped recording medium M times, where M is an integer (N.gtoreq.M>1), by said reproducing head for reading out data of a predetermined volume M times and writing said data in a memory,
• terminating data writing in said memory as soon as said data of the predetermined volume are stored in said memory,
• sending out data at a predetermined data transfer rate.

A data reproducing method for reproducing data by scanning a disc-shaped recording medium by a reproducing head, said method comprising the steps of:

• rotationally driving said disc-shaped recording medium at a velocity equal to N times a rotational velocity of the recording medium corresponding to a transfer rate of data recorded on said disc-shaped recording medium, N being a real number larger than unity,
• scanning a same position on said disc-shaped recording medium M times, where M is an integer (N.gtoreq.M>1), by said reproducing head for reading out data of a predetermined volume M times and writing said data in a memory,
• forming uncorrupted data of the predetermined volume by a majority operation on the data of the predetermined volume of M times of scanning stored in said memory,
• sending out the uncorrupted data at a predetermined data transfer rate.

A data reproducing method for reproducing data by scanning a disc-shaped recording medium by a reproducing head, said method comprising the steps of:

• rotationally driving said disc-shaped recording medium at a velocity equal to N times a rotational velocity of the recording medium corresponding to a transfer rate of data recorded on said disc-shaped recording medium, N being a real number larger than unity,
• scanning a same position on said disc-shaped recording medium M times, where M is an integer (N.gtoreq.M>1), by said reproducing head for reading out data of a predetermined volume M times and writing said data in a memory,
• forming uncorrupted data of said predetermined volume after at least a signal operation including an error correcting operation to data stored in said memory at a velocity more than N times a transfer velocity of the data recorded in said disc-shaped recording medium,
• sending out data at a predetermined data transfer rate.

A data reproducing apparatus for reproducing data recorded on a disc-shaped recording medium comprising

• driving means for rotationally driving said disc-shaped recording medium at a velocity equal to N times a rotational velocity of the recording medium corresponding to a transfer rate of reproduced data, N being a real number larger than unity,
• a reproducing head for scanning a same position on said disc-shaped recording medium M (N.gtoreq.M>1) times for reading out data of a predetermined volume by M times, where M is an integer,
• data forming means for forming uncorrupted playback data of the predetermined volume from data read out M times by said reproducing head,
• storage means for storing the playback data of the predetermined volume formed by said data forming means and continuously outputting said playback data at said transfer rate, and
• control means for controlling a scanning position of said reproducing head so that said reproducing head will scan a same position on said disc-shaped recording medium for a time interval necessary to read out the data of the predetermined recording medium M times and so that said reproducing head will start reading out succeeding data after the lapse of said time interval.

A data recording apparatus wherein continuously inputted input data received at a predetermined transfer rate are recorded on a disc-shaped recording medium comprising

• driving means for rotationally driving said disc-shaped recording medium at a velocity equal to N times a rotational velocity of the recording medium corresponding to said data transfer rate of said input data,
• a recording head for scanning said disc-shaped recording medium for recording data thereon,
• storage means for writing said input data in a volume not less than a predetermined volume,
• data forming means for converting the data of the predetermined volume in said storage means into record data having a data transfer rate equal to N times said data transfer rate of said input data, and for supplying resulting data to said recording head, and
• control means for controlling recording of the data of the predetermined volume stored in the storage means on said disc-shaped recording medium during the time of writing data of a next predetermined volume in said storage means.

A data reproducing method for reproducing data by scanning a disc-shaped recording medium by a reproducing head and outputting the reproduced data at a predetermined data transfer rate, the method comprising the steps of:

• rotationally driving the disc-shaped recording medium at a velocity equal to N times a conventional velocity for the recording medium when reproducing and outputting data at the predetermined data transfer rate, N being a real integer larger than unity,
• successively scanning a same position on the disc-shaped recording medium M times, where M is an integer (N.gtoreq.M>1), with a reproducing head to thereby reproduce M predetermined volumes of the same data and writing one or more of the M volumes of the data in a memory, and
• detecting an occurrence of a disturbance in the scanning of the disc-shaped recording medium by the reproducing head, interrupting data writing in the memory as a function of the
• detection of the disturbance and outputting from the memory at the predetermined data transfer rate as uncorrupted data one predetermined volume of data which was written into the memory during a period when no disturbance was detected.

A data recording apparatus wherein continuously inputted input data received at a predetermined transfer rate are recorded on a disc-shaped recording medium comprising

• driving means for rotationally driving the disc-shaped recording medium at a velocity equal to N times a predetermined rotational velocity of the recording medium conventionally used for the data transfer rate of the input data, N being a real number larger than unity,
• a recording head for scanning the disc-shaped recording medium to record data thereon,
• storage means for storing successive predetermined volumes, one at a time, of input data,
• modulation means for reading out and converting each predetermined volume of input data in the storage means into record data at a data transfer rate equal to N times the data transfer rate of the input data, and for supplying the record data to the recording head to be recorded on the disc-shaped recording medium, and
• control means for controlling recording of the record data so that the recording of each predetermined volume of data occurs entirely during the time of writing data of a next predetermined volume in the storage means.