System for storing and reproducing multiplexed data

Details System for storing and reproducing multiplexed data System for storing and reproducing multiplexed data

1998-11-19

2001-10-23

Nguyen, Huy (Department: 2615)

Motion video signal processing for recording or reproducing

Local trick play processing

With randomly accessible medium

C386S349000

Reexamination Certificate

active

06308004

ABSTRACT:

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) H
1
, H
2
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 the optical disk to reproduce the data stored therein. Reproduced signals output by the pickup
102
are input to the demodulator
103
for demodulation. The data demodulated by the demodulator
103
is input to the ECC circuit
105
via the sector detector
104
to detect and correct an error.
A sector number error signal is output to the track jump determination circuit
118
if the sector detector
104
fails to detect sector numbers (the addresses assigned to the sectors of the optical disk
101
) correctly. The ECC circuit
105
outputs an error generation signal to the track jump determination circuit
118
if an uncorrectable error is occurring in the data. Corrected data is delivered from the ECC circuit
105
to the ring buffer memory
107
for storage.
The ring buffer control circuit
106
reads the address of each sector from the output of the sector detector
104
to designate the write address (write point (WP)) on the ring buffer memory
107
corresponding to the address of the sector. The ring buffer control
106
also designates read addresses (reproduction points (RPs)) for the data written to the ring buffer memory
107
based on a code request signal from the multiplexed data separation circuit
108
located after the ring buffer control. It then reads data from the reproduction points (RP) to supply them to the multiplexed data separation circuit
108
.
The head separation circuit
109
in the multiplexed data separation circuit
108
separates pack headers and packet headers from the data delivered by the ring buffer memory
107
to supply them to the separation circuit control circuit
111
. The separation circuit control circuit
111
sequentially connects the input terminal G of the switching circuit
110
to the output terminal (switched terminal) H
1
or H
2
thereof according to the stream ID information in the packet headers delivered from the header separation circuit
109
to separate the time-division-multiplexed data correctly. It then supplies the data to the corresponding data buffer
113
or
115
.
The video code buffer
113
issues a code request signal to the multiplexed data separation circuit
108
using the available section of its internal code buffer. The buffer
113
then stores received data. It also receives code request signals from the video decoder
114
to output data it contains. The video decoder
114
reproduces video signals from the supplied data to output them from the output terminal.
The audio code buffer
115
issues a code request signal to the multiplexed data separation circuit
108
using the available section of its internal code buffer. The buffer
115
then stores received data. It also receives code request signals from the audio decoder
116
and outputs data it contains. The audio decoder
116
reproduces audio signals from the supplied data to output them from the output terminal.
The video decoder
114
thus requests data from the video code buffer
113
, while the video code buffer
113
requests data from the multiplexed data separation circuit
108
. The multiplexed data separation circuit
108
in turn requests data from the ring buffer control circuit
106
. In this case, data flows from the ring buffer memory
107
in the direction reverse to the request.
For example, reads from the ring buffer memory
107
decrease with the decreasing amount of data consumed by the video decoder
114
per unit time due to continuous data processing for simple screens. In this case, the amount of data stored in the ring buffer memory
107
may increase, resulting in overflow. The track jump determination circuit
118
thus uses write points (WPs) and reproduction points (RPs) to calculate the amount of data currently stored in the ring buffer memory
107
and, if the data exceeds a predetermined criteria, determines that the ring buffer memory may overflow to output a track jump instruction to the t

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