Albalá Ingenieros, S.A. AEM3000C01, Руководство пользователя

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Albalá Ingenieros | Manual AEM3000C01
4.3. The pre-processing block
The AEM3000C01 includes an audio pre-processing block that operates in the digital
domain, prior to the A/D conversion. This block provides level adjustment, phase
inversion and a small selection matrix between the four inputs and four outputs. The
following figure explains the contents of this block along with their default
configuration upon leaving the factory.
AUDIO PRE-PROCESSING BLOCK OF THE AEM3000C01
The 180
o
phase inversion circuits allow reversal of the polarity of each of the audio
signals.
The level adjust circuit can independently modify the gain of each output signal of the
matrix. The adjustment range is 127 steps of 0.5dB each, going from -39.5dB to +24dB.
The signal can also be muted. The full scale level of the output signal can be set between
15 and 24dBu using program jumpers.
The input matrix can connect any of the four inputs to the channels of the group being
embedded. The matrix is not a blocking type and can connect any one input to more
than one output.
The pre-processing block is only accessible via the communications controller. The
configuration to be performed by this block can be stored in the non-volatile EEPROM of
the module.
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