An audio CD player, which is used to play
only audio CDs, can be converted to play
the video CDs as well. Audio CD players
have all the required mechanism/functions
to play video CDs, except an MPEG card,
which is to be added to the player. This
MPEG card is readily available in the market.
This MPEG card decompresses the data
available from the audio CD player and converts
it into proper level of video signals
before feeding it to the television.
Digital signal processing is being
widely used in audio and video CDs and CD
playing equipment. These compact disks
have brought about a revolution in the
field of audio and the video technology. In
audio CDs, analogue signals are first converted
into digital signals and then stored
on the CD. During reproduction, the digital
data, read from the CD, is reconverted
into analogue signals. In case of video signals,
the process used for recording and
reproduction of data is the same as used
for audio CDs. However, there is an additional
step involved—both during recording
as well as reproduction of the digital
video signals on/from the compact disk.
This additional step relates to the compression
of data before recording on the
CD and its decompression while it is being
read. As video data requires very large
storage space, it is first compressed using
MPEG- (Motion Picture Expert Group) compatible
software and then recorded on the
CD. On reading the compressed video data
from the CD, it is decompressed and passed
to the video processor. Thus with the help
of the compression technique huge amount
of video data (for about an hour) can be
stored in one CD.
Step 1. Connection of MPEG card
to TV and step-down power transformer
to confirm proper working of
the MPEG card.
Step 2. Connections to audio CD
player after confirmation of proper
functioning of MPEG card during
Step 3. Playing audio and video CDs.
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