Sharp DV-500D Technical Manual page 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.
(1) 1 layer on both sides
0.6mm
0.6mm
(2) 2 layers on 1 sides
0.6mm
0.6mm
1-4 Disc Capacity
Type of Disc
Disc Size
12cm
8cm
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
Required data rate
Image
3,500k
Required disc capacity
Data Rate
4, 692kbps
4.7 gigabytes are required to record 133 minutes on a 1 layer on 1 side disc
1 layer on 1 side 2 layers on 1 side
4.7
1.4
Audio
(384k × 3)
+
Recording Duration
× (133 × 60) second ÷ 8 (8bit = 1byte) =
1 layer on both sides 2 layers on both sides
8.5 9.4
2.6 2.9
Subtitles
+ (10k)
4
Side B
(Standard reflection film)
Adhesive layer
Side A
(Standard reflection film)
Second layer
(Standard reflection film)
Adhesive layer
(transparent)
First layer
(semitransparent reflection film)
17
5.3
Total
= 4,692kbps(bit/second)
Memory Capacity
4.680.270kBytes