Under extreme circumstances, optfir might never produce an answer (atten>300), so...

[debian/gnuradio] / gnuradio-core / src / python / gnuradio / blks2impl / pfb_interpolator.py

diff --git a/gnuradio-core/src/python/gnuradio/blks2impl/pfb_interpolator.py b/gnuradio-core/src/python/gnuradio/blks2impl/pfb_interpolator.py
index a210e3de82c53409144174ab93d1d5f7bb7e2c97..a6094f7f459f871352be2843a0ec8af54b2c0552 100644 (file)
--- a/gnuradio-core/src/python/gnuradio/blks2impl/pfb_interpolator.py
+++ b/gnuradio-core/src/python/gnuradio/blks2impl/pfb_interpolator.py
@@ -45,7 +45,7 @@ class pfb_interpolator_ccf(gr.hier_block2):
             # Create a filter that covers the full bandwidth of the input signal
             bw = 0.4
             tb = 0.2
-            ripple = 0.1
+            ripple = 0.99
             made = False
             while not made:
                 try:
@@ -56,6 +56,10 @@ class pfb_interpolator_ccf(gr.hier_block2):
                     made = False
                     print("Warning: set ripple to %.4f dB. If this is a problem, adjust the attenuation or create your own filter taps." % (ripple))
 
+                    # Build in an exit strategy; if we've come this far, it ain't working.
+                    if(ripple >= 1.0):
+                        raise RuntimeError("optfir could not generate an appropriate filter.")
+
         self.pfb = gr.pfb_interpolator_ccf(self._interp, self._taps)
 
         self.connect(self, self.pfb)