SI477X-EVB Datasheet, PDF (24/62 Pages) Silicon Laboratories – Complete antenna-to-audio evaluation system

Si477x-EVB
5.10.2. Blend/Hicut/Soft Mute Configuration Helper
The mitigation engines such as FM stereo/mono blend, hi-cut, hi-blend, and soft mute have configurable low- and
high-end thresholds. These thresholds may be configured numerically through the Properties page or graphically
through the Configuration Helper.
Figure 28 shows an example of the Configuration Helper set to display FM stereo/mono blend based on RSSI. This
example also provides the ability to set the Fast and Slow metrics on the same screen. If a configuration setting
does not have Fast and Slow metrics available, only one graph and column of configurable values will appear. On
both graphs the green line depicts the blend (in percent stereo). The green point shows the current operating point
of the receiver (30 dBµV RSSI which results in 18% stereo given the property settings). The cyan line reflects the
actual reported stereo value (14%) from the Si477x device which is mitigated by all the metrics (RSSI/Multipath/
USN) in this example. Since the cyan line is tracking the green point or RSSI mitigated blend, the device is limiting
stereo based on RSSI in this example.
When selecting a mitigation control item, the description text is updated automatically. The name of the property
being changed is displayed in bold. The property can then be found in the property window by finding the property
with the same name being displayed in the configuration helper.
Changes made to this page are applied to the tuner immediately, making it a useful tool in real-time configuration of
the mitigation engines.
Figure 28. Configuration Helper
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