Merge branch 'minor-enhancement-frequency-bands' into 'master'

Minor enhancement frequency bands

See merge request !961

tangostationcontrol/tangostationcontrol/common/frequency_bands.py

@@ -4,6 +4,7 @@
 from dataclasses import dataclass
 
 from .constants import CLK_160_MHZ, CLK_200_MHZ
+from .sdp import subband_frequency, are_subbands_decreasing
 
 
 @dataclass(frozen=True)
@@ -37,6 +38,17 @@ class Band:
         # return first match
         return matching_bands[0].name
 
+    @property
+    def spectral_inversion(self) -> bool:
+        """Whether the spectrum is inverted, and thus should be inverted back by SDP."""
+        return are_subbands_decreasing(self.nyquist_zone, False)
+
+    def subband_frequency(self, subband: int) -> float:
+        """The central frequency of the given subband index, if SDP is configured accordingly."""
+        return subband_frequency(
+            subband, self.clock, self.nyquist_zone, self.spectral_inversion
+        )
+
 
 # Global list of all supported frequency bands
 bands = {}