Read Sharp DV-560H (serv.man6) Service Manual online
4
DVD-Series
1-3 Disc Structure
The first layer on the 2-layers disc (semitransparent reflection film) does not reflect unless the laser
light is focused.
light is focused.
(1) 1 layer on both sides
(2) 2 layers on 1 sides
1-4 Disc Capacity
1 layer on 1 side
2 layers on 1 side
1 layer on both sides
2 layers on both sides
12cm
4.7
8.5
9.4
17
8cm
1.4
2.6
2.9
5.3
1-5 Example of the DVD’s calculating memory capacity Condition
Condition
1. More than 3.5Mbps of average image data rate
(The compression rate changes depending on the image. This is the average value)
2. Audio is Dolby AC-3, 5.1ch digital sound
3. Dubbed in 3 languages + subtitled in 4 languages
4. 133 minutes are recorded on a 1 layer on 1 side disc
3. Dubbed in 3 languages + subtitled in 4 languages
4. 133 minutes are recorded on a 1 layer on 1 side disc
Required data rate
Image
Audio
Subtitles
Total
3,500k
+
(384k
×
3)
+
(10k)
=
4,692kbps(bit/second)
Required disc capacity
Data Rate
Recording Duration
Memory Capacity
4, 692kbps
×
(133
×
60) second
÷
8 (8bit = 1byte)
=
4.680.270kBytes
4.7 gigabytes are required to record 133 minutes on a 1 layer on 1 side disc
Type of Disc
Disc Size
,,,,,,,,,,,
,,,,,,,,,,,
0.6mm
0.6mm
Side B
(Standard reflection film)
(Standard reflection film)
Adhesive layer
Side A
(Standard reflection film)
(Standard reflection film)
,,,,,,,,,,,
,,,,,,,,,,,
0.6mm
0.6mm
Second layer
(Standard reflection film)
(Standard reflection film)
Adhesive layer
(transparent)
(transparent)
First layer
(semitransparent reflection film)
(semitransparent reflection film)
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