Variable transfer rate data reproduction apparatus
First Claim
1. A data reproduction apparatus comprising:
- data reproducing means for reproducing data, which is recorded in a sequence of sectors defined on a recording medium at a variable transfer rate, at intermittent cycles and providing signals indicative thereof;
data storage means, responsive to the signals from said data reproducing means, for storing therein the data reproduced by said data reproducing means;
decoding means for decoding data read out of said data storage means to provide a reproduction signal in sequence;
reproduction controlling means for controlling operations of said data storage means and said decoding means, said reproduction controlling means transferring the reproduced data stored in said data storage means to said decoding means so as to allow said decoding means to provide the reproduction signal in sequence,said reproduction controlling means controls a data reproduction operation of said data reproducing means so as to hold an amount of the reproduced data stored in said data storage means within a given range allowing said decoding means to decode the data read out of said data storage means to provide the reproduction signals continuously, anddata storage monitoring means for monitoring the amount of the reproduced data stored in a memory installed in said data storage means to compare the monitored amount of the reproduced data with an upper storage level, a middle storage level, and lower storage level and providing a signal indicative thereof,wherein said reproduction controlling means being responsive to the signal from said data storage monitoring means to inhibit the reproduced data stored in the memory from being read therefrom when the amount of the reproduced data stored in the memory is lower than the lower storage level, to inhibit the data reproduced by said data reproducing means from being stored in the memory and to store one of the sectors of the recording medium from which the data is being reproduced when the amount of the reproduced data stored in the memory exceeds the upper storage level, and to allow the data reproduced by said data reproducing means to be stored in the memory and to resume the data reproduction operation of said data reproducing means to reproduce the data from one of the sectors of the recording medium following said stored one when the reproduced data stored in the memory is decreased below the middle storage level.
2 Assignments
0 Petitions
Accused Products
Abstract
A variable transfer rate data reproduction system is provided which performs a reproduction operation and a reproduction inhibit operation cyclically to reproduce data recorded on a recording disc. A pickup traces a spiral track formed on the recording disc during the reproduction operation and is also controlled to continue to trace a following portion of the track over a plurality of track turns during the reproduction inhibit operation without a track jump. Upon resumption of the reproduction operation, the pickup jumps over the plurality of tracks to return back to a portion of the track where the reproduction operation has been interrupted previously. This results in decreased mechanical stress acting on mechanical parts for moving the pickup.
18 Citations
9 Claims
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1. A data reproduction apparatus comprising:
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data reproducing means for reproducing data, which is recorded in a sequence of sectors defined on a recording medium at a variable transfer rate, at intermittent cycles and providing signals indicative thereof; data storage means, responsive to the signals from said data reproducing means, for storing therein the data reproduced by said data reproducing means; decoding means for decoding data read out of said data storage means to provide a reproduction signal in sequence; reproduction controlling means for controlling operations of said data storage means and said decoding means, said reproduction controlling means transferring the reproduced data stored in said data storage means to said decoding means so as to allow said decoding means to provide the reproduction signal in sequence, said reproduction controlling means controls a data reproduction operation of said data reproducing means so as to hold an amount of the reproduced data stored in said data storage means within a given range allowing said decoding means to decode the data read out of said data storage means to provide the reproduction signals continuously, and data storage monitoring means for monitoring the amount of the reproduced data stored in a memory installed in said data storage means to compare the monitored amount of the reproduced data with an upper storage level, a middle storage level, and lower storage level and providing a signal indicative thereof, wherein said reproduction controlling means being responsive to the signal from said data storage monitoring means to inhibit the reproduced data stored in the memory from being read therefrom when the amount of the reproduced data stored in the memory is lower than the lower storage level, to inhibit the data reproduced by said data reproducing means from being stored in the memory and to store one of the sectors of the recording medium from which the data is being reproduced when the amount of the reproduced data stored in the memory exceeds the upper storage level, and to allow the data reproduced by said data reproducing means to be stored in the memory and to resume the data reproduction operation of said data reproducing means to reproduce the data from one of the sectors of the recording medium following said stored one when the reproduced data stored in the memory is decreased below the middle storage level. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A data reproduction apparatus comprising:
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data reproducing means for reproducing data, which is recorded on a recording medium at a variable transfer rate, at intermittent cycles and providing a signal indicative thereof; data storage means, responsive to the signal from said data reproducing means, for storing therein the data reproduced by said data reproducing means; decoding means for decoding the data reproduced by said data reproducing means to provide a reproduction signal in sequence; reproduction controlling means for controlling operations of said data storage means and said decoding means, said reproduction controlling means transferring the reproduced data stored in said data storage means to said decoding means so as to allow said decoding means to provide the reproduction signal in sequence; said reproduction controlling means controlling a data reproduction operation of said data reproducing means so as to hold an amount of the reproduced data stored in said data storage means within a given range required for said decoding means to decode the reproduced data continuously, data storage monitoring means for monitoring the amount of the reproduced data stored in a memory installed in said data storage means to compare the monitored amount of the reproduced data with an upper storage level, a middle storage level, and lower storage level and providing a signal indicative thereof, said reproduction controlling means being responsive to the signal from said data storage monitoring means to inhibit the reproduced data stored in the memory from being read therefrom when the amount of the reproduced data stored in the memory is lower than the lower storage level, to inhibit the data reproduced by said data reproducing means from being stored in the memory when the amount of the reproduced data stored in the memory exceeds the upper storage level, and to allow the data reproduced by said data reproducing means to be stored in the memory when the reproduced data stored in the memory is decreased below the middle storage level, and middle storage level changing means for changing the middle storage level, said middle storage level changing means detecting a transfer rate of the reproduced data read out of the memory to change the middle storage level to a higher level when the transfer rate is greater than a given threshold value and to change the middle storage level to a lower level when the transfer rate is smaller than the given threshold value.
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Specification