DOWNLOAD Sharp DV-560H (serv.man6) Service Manual ↓ Size: 432.55 KB | Pages: 48 in PDF or view online for FREE

Model
DV-560H (serv.man6)
Pages
48
Size
432.55 KB
Type
PDF
Document
Service Manual
Brand
Device
DVD / DVD Technical Manual (Based on the DV560H)
File
dv-560h-sm6.pdf
Date

Sharp DV-560H (serv.man6) Service Manual ▷ View online

7
DVD-Series
λ
2. Comparison of CDs and DVDs
Item
CD
DVD
DVD(CD)
Track Pitch
1.60
µ
m
0.74
µ
m
1.60
µ
m
Minimum Pit
0.87
µ
m
0.40
µ
m
0.87
µ
m
 Laser Beam Wavelength
780nm
 (Infrared Light)
650nm
(Red)
650nm
(Red)
Opening of the Object Lens
0.45
0.6
0.38
Laser Focus
1.8
µ
m
1.0
µ
m
1.7
µ
m
*CD mode of DVD
3. Decreasing the Laser Beam Focus Wavelength
The size of the laser beam focus 
Φ
 has small 
λ
, When NA increases, it becomes smaller.
 It is determined using the following formul:
NA (Opening of the object lens) = DVD : 0.6
CD(DVD) : 0.38
Φ
 =  
NA
λ 
(laser beam wavelength) = 650nm
DVD
 Φ
 = 
 
  
0.6
 
  
 = about 1
µ
m  
 
CD(DVD) 
Φ =
 
0.38
    = about 1.7
µ
m
NA shows the brightness of the lens.  When the focal distance of the lens becomes shorter and
the diameter increases, the NA becomes bigger.  It is determined using the following formul:
4. Longer Track, Smaller Pit
650nm
650nm
NA =  
f
 a
a
Disk
f
Laser Beam Focus
0.74  Track Width
Minimum Pit
0.4  
8
DVD-Series
5. Thinner Disc
Decreasing the thickness of a disc can cause less focus movement against similar disc inclination
and less focus disorder.
6. Realization of Long Hour Reproduction
Even by making the track longer and the pit smaller to expand capacity, it is not possible to
record one whole movie on one side (1 layer) of a 12cm DVD disc if using current image data
information.  To reproduce 133 minutes on a 1 layer on 1 side disc, it is necessary to digitally
compress the image data.
Most digital compression technology of data is done is the audio field.
It is already routinely used in personal computers and MD.
To make comparisons with the audio field, digital compression technology for images, which
contain far more information, were processed by the MPEG (Moving Picture Image Coding
Expert Group) committee of ISO, and became the world standard.
First, MPEG1 (a fixed bit rate system) was standardized and made practical for use in video CDs
(karaoke, etc.).
Then, MPEG2, DVD actualization, became standardized.  MPEG2 is called “Variable Bit Rate
System”.
It compresses information while changing the amount of data, depending on the amount of data
on the image.  That means, it compares the former and latter images, then records the amount
of change as data.
2-4 Realization of High Quality Images
1. High Quality Imaging and Resolving Rate through Full Digitalization
The image performance of DVD actualizes 500 horizontal lines of resolution, an increase from
traditional recording media.
Currently, it is superior to the “the media with the highest quality image”, an LD (430 horizontal
lines of resolution).  It matches master tapes made to professional specifications.
With its high quality imaging and high number of resolution lines, image outlines are sharp.
Even in dark scenes, there is less noise and clearer perspective.
Compared with to horizontal lines of resolition / recording system of DVD and traditional media
Object Lens
Laser Beam Focus
 Horizontal Lines of Resolution 
|
Recording System
s
500
DVD
Digital (MPEG2)
400 
240
S-VHS Video Tape
/VHS Video Tape
Analogue
430
LD
Analogue
240
VideoCD
Digital (MPEG1) 
  
9
DVD-Series
DVD responds to wide sized screens
From the beginning of its development, DVD was meant to be applicable for wide sizes.
When zoom reproduced (expanding the  mage in vertical and horizontal directions) on a
wide screen monitor, the picture quality isn’t weakened.  Instead, a beautiful and delicate
image is reproduced.
[Full Mode]
[Zoom Mode]
2-5 Super Digital Sound That Surpasses CDs
1. 144dB Dynamic Range can be recorded
To use its large capacity equivalent to 7 times the time available on a CD in an effective way,
the 96kHz/24bit high sampling/high bit can record a dynamic range of 144dB super hi-fi digital
audio.  It also reproduces sounds beyond the range of human hearing, restoring subtle nuance
to original sounds.
This DVD reproduced by wide TV.
It realize of high quality images.
This video reproduced by wide TV.
But, it worries about weakness of 
picture of quality.
*This picture is image illustration 
for identification effects.
146MB
(24bit)
96dB
(16bit)
DVD Range
    20kHz              40kHz
Natural Sound
An example of a dynamic range comparison on DVD and CD
Dynamic Range
Wavelength Band Range
2. Sound Equivalent to Movie Theaters
DVD adopts Dolby AC-3, 5.1ch.
In addition to the 4 channels on front, back, right and left, a center channel used mainly for
dialogue and a heavy lower sound are included, to make 5.1 channels.
With these, fully digital sound can be recorded and reproduced with this unit.2-6
2-6 Various Advanced Functions of DVD
These functions are able to be included on DVD discs, and the content is decided on the disc side.
Therefore, there are various contents available, depending on the DVD disc used.  Only included
functions can be reproduced by remote control operation.
10
DVD-Series
1. Multi-Language Response
(1)
Sound Selection
DVD Video contains a maximum of 8 sound streams.  They flow together like traffic a
digital signal road.  Do not confuse this with “8 channels”.
Including the original language, a maximum of 8 different languages can be recorded.
Additionally, Dolby AC-3, 5.1ch can be included on all 8 streams.
For example, it is possible to put English sound 5.1ch on the first, French sound 5.1ch on
the second and non-compressed linear PCM on the third stream.
However, it requires an amount of data, so the recording time of images will be shortened.
To make the image recording time longer, there are options, such as occupying less streams,
and using 2 Dolby AC-3 channels instead of non-compressed linear PCM.
(2)
Subtitle Selection
Using the maximum 32 channel sub-image, DVD can process subtitles in a maximum of
32 languages.
Each language can be individually recorded on each channel, such as Japanese, English,
French, etc.
2. Special Mode
(1)
Multi-Angle Function
A maximum of 9 image angles from a concert,
sporting event, drama, etc. can be recorded with a
multiple numbers of cameras.  When the event is
recorded in such way on a DVD disc, you can
choose the angle that you want to see.
(2)
Parental Lock
With the multi-story application, functions that can
prevent younger viewers from seeing sex or violent
scenes that parents don’t want their children to
watch include the following:
1 Cutting the scene
2 Replace the scene with a prepared safe scene
3 Disc unable to be reproduced
* Locking function are set with the locking level
* There are a maximum of 9 locking levels.  These
levels determined and set following the laws of
the country where the product is being sold.
* DVD disc will set a certain lock level beforehand
when scenes that parents do not want their chil-
dren to watch are recorded.
* When a lock level is set on an a DVD video
player, scenes or discs that violate that level
cannot be reproduced
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