Motion video signal processing for recording or reproducing – Local trick play processing – With randomly accessible medium
Patent
1995-10-06
2000-11-21
Nguyen, Huy
Motion video signal processing for recording or reproducing
Local trick play processing
With randomly accessible medium
386 96, H04N 576
Patent
active
061514411
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a data reproduction apparatus and a data storage medium that can be preferably applied to, for example, those using a storage medium with digitalized moving picture stored therein.
BACKGROUND ART
A conventional data reproduction apparatus that reproduces data from a disk as a storage medium with digitalized moving picture stored therein is described as a variable-rate-sensitive data reproduction apparatus as shown in FIG. 35 in the applicant's Japanese Patent Laid Open No. 6-124,168 (publicized on May 6, 1994). This reproduction apparatus reproduces data stored on an optical disk 101 using a pickup 102. The pickup 102 irradiates the optical disk 101 with laser beams and uses light reflected from the optic disk 101 to reproduce the data stored therein. Signals reproduced by the pickup 102 are delivered to a demodulator 103. The demodulator 103 demodulates the reproduced signals output by the optic pickup 102 to output them to a sector detector 104.
The sector detector 104 detects an address stored in each sector from the delivered data to output it to a ring buffer control circuit 106. It also outputs the data to an ECC circuit 105 located after the sector detector while maintaining sector synchronization. The sector detector 104 outputs a sector number error signal to a track jump determination circuit 118 via the ring buffer control circuit 106 if the detector fails to detect addresses or if detected addresses are not continuous.
The ECC circuit 105 detects an error in data supplied by the sector detector 104, and uses redundant bits contained in the data to correct the error to output the corrected data to a ring buffer memory (FIFO) 107 for the ring jump. Furthermore, if the ECC circuit 105 fails to correct an error in data, it outputs an error generation signal to the track jump determination circuit 118.
The ring buffer control circuit 106 controls writes to and reads from the ring buffer memory 107, and monitors a code request signal requesting data output from a multiplexed data separation circuit 108.
The track jump determination circuit 118 monitors the output of the ring buffer control circuit 106 to output a track jump signal to a tracking servo circuit 117 as required to track-jump the reproduction position of the pickup 102 relative to the optical disk 101. The track jump determination circuit 118 also detects a sector number error signal from the sector detector 104 or an error generation signal from the ECC circuit 105 to output the track jump signal to the tracking servo circuit 117 to track-jump the reproduction position of the pickup 102.
The output of the ring buffer memory 107 is supplied to the multiplexed data separation circuit 108. A header separation circuit 109 in the multiplexed data separation circuit 108 separates pack headers and packet headers from data supplied from the ring buffer memory 107 to deliver them to a separator control 111, and supplies time-division-multiplexed data to the input terminal G of a switching circuit 110. The output terminals (switched terminals) H1, H2 of the switching circuit 110 are connected to the input terminals of a video code buffer 113 and an audio code buffer 115, respectively. The output of the video code buffer 115 is connected to the input of a video decoder 114, while the output of the audio code buffer 115 is connected to the input of an audio decoder 116.
In addition, code request signals generated by a video decoder 114 are input to the video code buffer 113, while code request signals generated by the video code buffer 113 are input to the multiplexed data separation circuit 108. Similarly, code request signals issued by an audio decoder 116 are input to the audio code buffer 115, while code request signals issued by the audio code buffer 115 are input to the multiplexed data separation circuit 108.
The operation of each component of this data reproduction apparatus is described next. The pickup 102 irradiates the optical disk 101 with laser beams, and uses light reflected from th
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Fujinami Yasushi
Kawamura Makoto
Frommer William S.
Nguyen Huy
Sony Corporation
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