Sony MDS-501 - Manual (Page 6)

What is the MiniDisc?
Preparations
Precautions
How the Shock-Resistant Memory works
One major drawback of optical read systems is that they can
skip or mute when subjected to vibration. The MD system
resolves this problem by using a buffer memory that stores
up to 10 seconds of audio data. This is possible because of a 1
second lag between the time audio data is picked up and
when it is decoded (see illustration below). Should the
optical pickup be jarred out of position, the correct audio
data plays from the buffer memory. Using a concept called
"sector repositioning/' the optical pickup has the ability to
within 13 milliseconds identify the disruption and resume
reading from the correct point. As long as the optical pickup
returns to the correct position within about 10 seconds, you
never experience mistracking or muting.
■ Shock-Resistant Memory System
When
playing
normally
Buffer
memory
ATRAC
decoder
When subjected
to vibration
Opticai'^^^
pickup
lim
Flow of
data stops
Buffer
memory
ATRAC
decoder
But
i
i
Û
1 1 1 1 1
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On safety
• As the laser beam used in this unit is harmful to the eyes,
do not attempt to disassemble the cabinet. Refer servicing
to qualified personnel only.
• Should any solid object or liquid fall into the unit, unplug
the unit and have it checked by qualified personnel before
operating it any further.
On power sources
• Unplug the unit from the wall outlet when it is not to be
used for an extended period of time.
On operation
• If the unit is brought directly from a cold to a warm
location, or is placed in a very damp room, moisture may
condettse on the lenses inside the MiniDisc recorder,
causing the MiniDisc recorder to operate improperly.
Should this occur, remove the disc and wait about an hour
for the moisture to evaporate.
On the MiniDisc cartridge
• Do not open the shutter to expose the disc.
• Do not place the cartridge where it will be subject to
extremes of sunlight, temperature, moisture or dust.
On cleaning
• Clean the casing with a soft cloth slightly moistened with
water or a mild detergent solution. Do not use any type of
abrasive pad, scouring powder or solvent such as alcohol
or benzene as it may mar the finish of the casing.
If you have any questions or problems concerning your unit,
please consult your nearest Sony dealer.