Sharp DV-500D User manual

1
DVD-Series
SHARP CORPORATION
T58P2DV-500D/
TECHNICAL MANUAL
DVDVIDEO PLAYER
MODELS
DV-500D
DV-550
DV-550W/X
DV-550U
DV-560S
DV-560H
ON
DIGITAL
GAMMA DIGITAL
S PICTURE
DV-S100
POWER
OFF
OFF
IN MAX
LEVEL
PHONES
COMPACT
D I G I T A L
DOLBY
DIGITAL VIDEO
DVD / VIDEO CD / CD
CONTENTS
page
1. The Birth of DVD................................................................................................3
2. DVD Features ....................................................................................................6
3. Technical Point of DVDs ..................................................................................13
4. DVD Servo Circulation .....................................................................................20
5. TRAYMECHA Control......................................................................................27
6. TRAYMECHA Timing Chart .............................................................................32
DV-800D
DV-880
DV-880X/W
DV-890S

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DVD-Series

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DVD-Series
1. The Birth of DVD
1-1 Main Specifications of the DVDVideo Player
Disc Diameter 120mm
Disc Thickness 1.2mm 0.6mm x 2
Semiconductor Laser Wavelength 650nm
Lens (NA) 0.6
Pit Length 0.4~1.87µm / 0.44~2.05µm
(Single Layer) (Double Layer)
Track Pitch 0.74µm
Sector Allocation CLV
Modulation System 8/16 Modulation
Correction System RS-PC (Reed Solomon Product Code)
14.7GB (1 Layer on 1 Side)
Memory Capacity 28.5GB (2 Layers on 1 Side)
39.4GB (1 Layer on Both Sides)
417GB (2 Layers on Both Sides)
1-2 Type of Discs
There are 4 types of discs.
(1) 1 layer on 1 side disc (2) 1 layer both sides disc
(3) 2 layers on 1 side disc (4) 2 layers on both sides disc
0.6mm
0.6mm
0.6mm
0.6mm
,,,,,,,
Side A
Side B
0.6mm
0.6mm
0.6mm
0.6mm
First layer
First layer
Second layer
Second layer
First layer Second layer

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DVD-Series
1-3 Disc Structure
Thefirstlayeronthe2-layersdisc(semitransparentreflectionfilm)doesnotreflectunlessthelaser
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
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)
Adhesive layer
Side A
(Standard reflection film)
,,,,,,,,,,,
,,,,,,,,,,,
0.6mm
0.6mm
Second layer
(Standard reflection film)
Adhesive layer
(transparent)
First layer
(semitransparent reflection film)

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DVD-Series
1-6 Order and Direction of Disc Recording
There are 3 types of recording orders and directions.
1 layer disc
2 layers disc (B)
1-7 Two Discs are StackedTogether to Form DVD discs
The DVD disc structure is the stacking of two 0.6mm thin type discs, making it most suitable for
reading high density recorded data signals.
The thinner the disc, the less number of obstacles between pits notched on the optical pick up and
disc, so more precise reading can be achieved.
Additionally, stacking these same material discs together back-to-back, increases evenness,
meaningthe discwillwarp lessdueto heatandhumidity comparedtosingle 1.2mmboards. Thus,
the discs are more reliable.
Features of the 0.6mmThick Disc
1. Materialized mass capacity and high density
• Because the thickness is half that of traditional discs, it is less likely to warp or slant.
• Degree of evenness becomes much higher at assembly, with high rates of evenness and
precision.
2. Makes board-making easier and reduces production costs
• The stacked structure is highly resistant to environmental changes (heat, humidity)
• The thin structure increases the time cycle, so forming is easier stabilized
• Overall, it will cost less than 20% more than a CD.
2 layers disc (A)
,,
,,
,,,,
,,,,
2
1
Data areaLead-in area Lead-out area
Parallel track path
Center of the disc
,,
,,
Center of the disc
Lead-in area Data area Lead-out area
,,
,,,
2
1
Data areaLead-in area
Lead-out area
Middle area
Opposite track path
Center of the disc
0.6mm
0.6mm 1.2mm
Changes in temperature and humidity
DVD (stacked-together structure) CD (single board structure)

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DVD-Series
2. DVD Features
2-1 DVD is not a DigitalVideo Disc
“DVD” is often considereed the abbreviation for Digital Video Disc, but as the unified standard
for the next generation of high density optical fiber discs, the term “DVD” is not used in that way.
It has been adopted as the name of the unified standard.
2-2 Amazing Mega-Capacity
AlthoughtheDVD’ssizeisthesameasa12cmCD,oneDVDsidecanrecordhugecapacity,about
4.7GB, equivalent to approximately 7 CDs. This disc can be recorded to 133 minutes for full a
movie film, with high quality picture and sound which like a movie theater.
Additionally, it is only the capacity for one side. The 1 side 2 layer type can record 8.5GB, the 2
sides with 1 layer type can record 9.4 GB and an amazing maximum 17GB can be recorded on 2
side 2 layers type.
4.7 GB = 688 MB
●Comparison of DVD data capacity
DVD
(one side)
CD
X 6.8 CDs7 times as more
than a CD
DVD
(one side)
CD
2.2 (side)2.2 times as much a
s an LD
133 MIN = 60 MIN
●Comparison of DVD recording times (approximate)
The memory capacity of a disc is determined by the time of information and amount of data per
second (data rate). In the case of CDs, the number of quantization bits is 16, and the sampling
wavelength is 44.1kHz with 2 channels. So, the amount of data is 16 ×44.1k ×2 = approx.1,411k
bits/second = 1.411M bits/second.
ThemaximumlengthofaCD is74 minutes. Ifthe samesound fromaCDisrecordedontheDVD,
it comes to 4.7GB. That means, 37.6 (4.7 ×8), and it will come to 37.6 ×1,000 ÷1.411 = approx.
26,648 (seconds) for one side.
That is approximately 444 minutes (7 hours 24 minutes).
2-3 Secrets of Producing Large Capacity Recording and Long Hour Replay
1.Realization of large capacity recording
The track pitch is less than half of that of a CD, making it longer.
Also, the recorded amount of information is increased due to the smaller pit (less than half of
that of a CD)
Becausethepit is smaller, the laser focus needs to be smaller. To do this, the wavelength of the
laser beam is shortened and the opening of the object lens (NA) is increased.
This bigger NA increases the influence of the aberration of laser beam from the protection film
(thetransparentplasticpart). Thiscausesblurringofthelaserfocusagainstthediscinclination,
or its slippage when the pit becomes bigger, lowering the signal reading precision (increasing
noise).
Todecreasetheinfluenceofthislaserbeamaberrationfromprotectionfilm(transparentplastic
part), we decreased the thickness of the disc.
(one-half that of a CD, 0.6mm) Also ensure CD compatibility, we put 2 of the discs together.
Byputting2ofthese0.6mmthickdiscstogether,theevennessofthediscisincreased,warping
due to heat and humidity is decreased and the signal reading precision is improved.2.

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DVD-Series
λ
2. Comparison of CDs and DVDs
Item CD DVD DVD(CD)
Track Pitch 1.60µm 0.74µm 1.60µm
Minimum Pit 0.87µm 0.40µm 0.87µm
Laser Beam Wavelength 780nm (Infrared Light) 650nm(Red) 650nm(Red)
Opening of the Object Lens 0.45 0.6 0.38
Laser Focus 1.8µm 1.0µm 1.7µm
*CD mode of DVD
3.Decreasing the Laser Beam FocusWavelength
The size of the laser beam focus Φhas 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 1µm CD(DVD) Φ = 0.38 = about 1.7µm
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
aDisk
f
Laser Beam Focus
0.74 Track Width
Minimum Pit
0.4

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DVD-Series
5.Thinner Disc
Decreasingthethicknessofadisccancauselessfocusmovementagainstsimilardiscinclination
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(afixedbitratesystem)wasstandardizedandmadepracticalforuseinvideoCDs
(karaoke, etc.).
Then,MPEG2,DVD actualization, becamestandardized. MPEG2iscalled “Variable BitRate
System”.
Itcompresses informationwhilechanging theamountof data,dependingon theamountof 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.HighQualityImagingandResolvingRatethroughFullDigitalization
The image performance of DVD actualizes 500 horizontal lines of resolution, an increase from
traditional recording media.
Currently,itissuperiortothe“themediawiththehighestqualityimage”,anLD(430horizontal
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)

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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 SoundThat 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,
the96kHz/24bithighsampling/highbitcanrecord adynamicrangeof144dBsuperhi-fidigital
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 MovieTheaters
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.

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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.
Tomaketheimagerecordingtimelonger,thereareoptions,suchasoccupyinglessstreams,
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
preventyoungerviewersfromseeingsexorviolent
scenes that parents don’t want their children to
watch include the following:
1Cutting the scene
2Replace the scene with a prepared safe scene
3Disc unable to be reproduced
* Locking function are set with the locking level
* Therearea maximumof9 lockinglevels. These
levels determined and set following the laws of
the country where the product is being sold.
* DVDdiscwillsetacertainlocklevelbeforehand
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