78
Laser Diode Properties
DVD unit
Material
AlGaInP
Wavelength
650 nm
Emission Duration
Continuous
Laser Output
Less than 1000 µW
* This output is the value measured at a
distance of 100 mm from the objective lens
surface on the Optical Pick-up Block.
CD unit
Material
GaAlAs
Wavelength
780 nm
Emission Duration
Continuous
Laser Output
Less than 173 µW
* This output is the value measured at a
distance of 100 mm from the objective lens
surface on the Optical Pick-up Block.
Audio characteristics
Frequency response
DVD (PCM): 20 Hz to 44 kHz (+1.0 dB
to –3.0 dB)
CD: 20 Hz to 20 kHz (+1.0 dB to –2.0
dB)
Signal-to-noise ratio (S/N)
More than 85 dB
High wave distortion rate
Less than 0.02 %
Dynamic range
More than 88 dB
Wow and flutter
Less than detected value (±0.001 % W
PEAK)
SpecificationsSpecifications
System
System
Portable DVD Unit
Laser
Semiconductor laser
Signal format system
PAL colour system
Disc
Compatible discs
• DVD-ROM
• CD-ROM (mode-1 or mode-2 form 1)
• CD-R
• PHOTO CD (multisession)
• CD EXTRA (CD+)
• DVD VIDEO (PAL/NTSC)
• VIDEO CD (PAL/NTSC)
• AUDIO CD (CD-DA)
Note
Depending on the disc, optional software or
the MPEG playing card is necessary for use.
Disc diameter
12 cm (4
3
/
4
inch), 8 cm (3 inch)
Drive performance
Data transfer rate
DVD-ROM: less than 1.352 MB/s
CD-ROM: less than 1.2 MB/s
(8× speed)
(with the AC power adapter)
less than 0.6 MB/s
(4× speed)
(with the battery pack)
These sustained rates are differ,
depending on the PC.
Averaged access time (random access)
DVD-ROM: 300 ms
CD-ROM: 250 ms
Buffer memory capacity
1024 KB (DVD)
512 KB (CD)
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