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Audio Input Module

As per high-level specifications, each audio input can be either balanced or unbalanced. Each input module consists of eight tip-ring-sleeve 1/4 inch jacks, appropriate circuitry for processing the input signals, and appropriate Pbus interface circuitry. As per specifications, a digitally-controlled gain stage shall be employed, to provide a trim adjust for each input. Figure 19 shows a block diagram of an audio input module. A standard system has four of these modules.

Figure 19: Mixer unit, audio input module diagram.

Steve Richardson 2000-07-06
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