restore audio chopper decoding

csdr/chain/digimodes.py

@@ -0,0 +1,14 @@
+from csdr.chain.demodulator import SecondaryDemodulator, FixedAudioRateChain
+from owrx.audio.chopper import AudioChopper
+from pycsdr.modules import Agc, Convert
+from pycsdr.types import Format
+
+
+class AudioChopperDemodulator(SecondaryDemodulator, FixedAudioRateChain):
+    # TODO parser typing
+    def __init__(self, mode: str, parser):
+        workers = [Convert(Format.FLOAT, Format.SHORT), AudioChopper(mode, parser)]
+        super().__init__(workers)
+
+    def getFixedAudioRate(self):
+        return 12000