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12.2.3 MIC IN
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Characteristics
Mono microphone input: Electret type are supported by default, for dynamic
microphone utilization, please refer to the factory. The analog signal can be either line
level (Line In) or -20dB attenuated from line level, the difference is made up through a
software controlled -20dB gain stage.
The microphone input may be processed for conversion or gained/attenuated from
+12dB to 34.5dB in 1.5dB steps then mixed with left and right Line Out signals before
the volume stage.
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Connection
The microphone connects directly to the board through the J22 Jack connector located
on the edge bracket. The microphone signal can also be input via the Audio I/O
connector (J18, pin 9).
12.2.4 CD IN
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Characteristics
Stereo CD-ROM input: each analog channel can be independently gained or attenuated
from +12dB to -34.5dB in 1.5dB steps. The left and right CD In signals can be mixed
in the analog domain with left and right Line Out signals.
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Connection
The CD-ROM connects directly to the board through the J17 onboard connector.
The board provides a standard 4-pin male connector. To connect a CD-ROM use the
CD-ROM manufacturer cable.
Exploring the Multimedia Capabilities of the Board
12-11
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