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# Audio Pipeline

The audio pipeline in FFD processes two channel PDM microphone input into a single output channel, intended for use by an ASR engine.

The audio pipeline consists of 3 stages.

Table 7 FFD Audio Pipeline
Stage | Description | Input Channel Count | Output Channel Count
--- | --- | --- | ---
1 | Interference Canceller and Voice Noise Ratio | 2 | 1
2 | Noise Suppression | 1 | 1
3 | Automatic Gain Control | 1 | 1

See the Voice Framework User Guide for more information.