Add WDF allpass generator

Closes #156 (closed)

b_asic/sfg_generator.py

@@ -3,11 +3,11 @@ B-ASIC signal flow graph generators.
 
 This module contains a number of functions generating SFGs for specific functions.
 """
-from typing import Dict, Optional, Union
+from typing import Dict, Optional, Sequence, Union
 
 import numpy as np
 
-from b_asic.core_operations import SymmetricTwoportAdaptor
+from b_asic.core_operations import Name, SymmetricTwoportAdaptor
 from b_asic.port import InputPort, OutputPort
 from b_asic.signal import Signal
 from b_asic.signal_flow_graph import SFG
@@ -15,7 +15,7 @@ from b_asic.special_operations import Delay, Input, Output
 
 
 def wdf_allpass(
-    coefficients: np.ndarray,
+    coefficients: Sequence[float],
     input_op: Optional[Union[Input, Signal, InputPort]] = None,
     output: Optional[Union[Output, Signal, OutputPort]] = None,
     name: Optional[str] = None,
@@ -108,4 +108,4 @@ def wdf_allpass(
         signal_out = Signal(adaptor1.output(0))
 
     output << signal_out
-    return SFG([input_op], [output], name=name)
+    return SFG([input_op], [output], name=Name(name))