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| Noninvasive DC restoration to upgrade AC coupled systems |
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| Shadow visual effects wipe generator |
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| Special effect apparatus |
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| Method for the time correction of a digital switching signal |
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| Chroma-key signal generator |
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Searching a helical autoreverse magnetic tape for a desired program information from both sides of the tape
| Details |
Inventors: Sasaki, Tadao;
Assignee: Sony Corporation (Tokyo, JP)
Primary Examiner: Psitos; Aristotelis M.
Assistant Examiner: Cullen; Larry T.
Attorney, Agent or Firm: Maioli; Jay H.
In a reproducing apparatus having the capability of reproducing data in both directions from a recording medium in the form of a tape, when a program recorded on the recording medium in the form of a tape is accessed in a high speed mode, a fast forward tape travel operation or a fast reverse tape travel operation is performed while monitoring the program number recorded in the area opposite to the current reproducing position, and the searching speed is controlled when the searching position reaches a location near a reverse position so that the searching position does not go beyond the reverse position. A recording apparatus operates to record a program number on a recording medium in the form of a tape on the basis of the program number which was recorded at the end of the previous recording operation so that a correct value is given as the program number to the current recording operation. |
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DETAILED DESCRIPTION To achieve the above objective, the present invention provides a reproducing apparatus having the capability of searching for a desired data block recorded on a recording medium in the form of a tape, the recording medium having two parts separated at a substantially central line extending along the length of the recording medium, a forward track group being formed on one of the two parts, a reverse track group being formed on the other part, the reproducing apparatus comprising: a reproducing head for reading data from the forward and reverse track groups at the same time; a memory which, during an operation of searching for the desired data block, stores data number information corresponding to each data block reproduced from one of the forward and reverse track groups, and also stores data number information reproduced from the other one of the forward and reverse track groups; and a controller which, during the operation of searching the desired data block, controls the operation of switching the searching direction on the basis of the data number information associated with both forward and reverse track groups.
The present invention also provides a recording apparatus for recording a data block and a data block number corresponding to the data block on a recording medium in the form of a tape, the recording medium having two parts separated at a substantially central line extending along the length of the recording medium, a forward track group being formed on one of the two parts, a reverse track group being formed on the other part, the recording apparatus comprising: a memory for storing a data block number corresponding to the data block recorded at the end of a recording operation; and a recording unit which, at the start of a recording operation, records a data block number, which is greater by one than the data block number stored in the above-described memory, on the recording medium in the form of a tape.
In the present invention, data is read from both the forward and reverse track groups at the same time so that the shortest possible operation for getting to the target position is determined from the data number information obtained from the track group opposite to the current position
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