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3.4.2. Audio Signal Processing & Interface
The voice codec circuitry processes analog audio components in the voice uplink (VUL) path and
applies this signal to the voice signal interface for eventual baseband modulation. In the voice
downlink (VDL) path, the codec circuitry changes voice component data received from the voice serial
interface (VSP) into analog audio.
Figure 10. Audio Interface Block Diagram
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