Audio Routing And Filtering - XMOS VocalFusion XVF3510 User Manual

4.4. AUDIO ROUTING AND FILTERING

Many of the parameters and functions of the XVF3510 may be controlled via the control interface. This
control extends to being able to configure signal routing through the pipeline itself, providing flexibility
useful in:
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Hardware testing of mics by monitoring the raw mic signal.
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Improving pipeline performance by filtering known noise sources at the raw mic input.
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Monitoring and debugging of reference signals and mic signals during development.
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Compensating for gain offset in reference signal.
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Supporting specific audio connectivity such as obtaining the reference signal from I
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Inserting audio filtering where a speaker is connected downstream of the XVF3510 via I
The blocks supported are as follows:
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Signal Multiplexers. These allow dynamic selection (switching) of signals. The signals available
depend on the multiplexer position.
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Gain Blocks. These are blocks that apply a variable bit shift (left or right) and, in the case of left
shift, saturate in the case of overflow. Because they are shifters, the gain applied is a power of
two.
}
Filter Blocks. The filter blocks consist of two cascaded biquad units. Each of the five coefficients
per stage is directly manipulated via the control utility.
The arrangement of the blocks, with respect to the device Input & Output and the XVF3510 audio
processing pipeline, is shown in the below diagram:
Figure 4-9 Input and output options for the 3510 Audio pipeline
XM-014232-PC
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