diff --git a/Lib/aifc.py b/Lib/aifc.py
index 1916e7ef8..5254987e2 100644
--- a/Lib/aifc.py
+++ b/Lib/aifc.py
@@ -138,7 +138,11 @@ import struct
 import builtins
 import warnings
 
-__all__ = ["Error", "open", "openfp"]
+__all__ = ["Error", "open"]
+
+
+warnings._deprecated(__name__, remove=(3, 13))
+
 
 class Error(Exception):
     pass
@@ -251,7 +255,9 @@ def _write_float(f, x):
     _write_ulong(f, himant)
     _write_ulong(f, lomant)
 
-from chunk import Chunk
+with warnings.catch_warnings():
+    warnings.simplefilter("ignore", DeprecationWarning)
+    from chunk import Chunk
 from collections import namedtuple
 
 _aifc_params = namedtuple('_aifc_params',
@@ -447,21 +453,33 @@ class Aifc_read:
     #
 
     def _alaw2lin(self, data):
-        import audioop
+        with warnings.catch_warnings():
+            warnings.simplefilter('ignore', category=DeprecationWarning)
+            import audioop
         return audioop.alaw2lin(data, 2)
 
     def _ulaw2lin(self, data):
-        import audioop
+        with warnings.catch_warnings():
+            warnings.simplefilter('ignore', category=DeprecationWarning)
+            import audioop
         return audioop.ulaw2lin(data, 2)
 
     def _adpcm2lin(self, data):
-        import audioop
+        with warnings.catch_warnings():
+            warnings.simplefilter('ignore', category=DeprecationWarning)
+            import audioop
         if not hasattr(self, '_adpcmstate'):
             # first time
             self._adpcmstate = None
         data, self._adpcmstate = audioop.adpcm2lin(data, 2, self._adpcmstate)
         return data
 
+    def _sowt2lin(self, data):
+        with warnings.catch_warnings():
+            warnings.simplefilter('ignore', category=DeprecationWarning)
+            import audioop
+        return audioop.byteswap(data, 2)
+
     def _read_comm_chunk(self, chunk):
         self._nchannels = _read_short(chunk)
         self._nframes = _read_long(chunk)
@@ -497,6 +515,8 @@ class Aifc_read:
                     self._convert = self._ulaw2lin
                 elif self._comptype in (b'alaw', b'ALAW'):
                     self._convert = self._alaw2lin
+                elif self._comptype in (b'sowt', b'SOWT'):
+                    self._convert = self._sowt2lin
                 else:
                     raise Error('unsupported compression type')
                 self._sampwidth = 2
@@ -659,7 +679,7 @@ class Aifc_write:
         if self._nframeswritten:
             raise Error('cannot change parameters after starting to write')
         if comptype not in (b'NONE', b'ulaw', b'ULAW',
-                            b'alaw', b'ALAW', b'G722'):
+                            b'alaw', b'ALAW', b'G722', b'sowt', b'SOWT'):
             raise Error('unsupported compression type')
         self._comptype = comptype
         self._compname = compname
@@ -680,7 +700,7 @@ class Aifc_write:
         if self._nframeswritten:
             raise Error('cannot change parameters after starting to write')
         if comptype not in (b'NONE', b'ulaw', b'ULAW',
-                            b'alaw', b'ALAW', b'G722'):
+                            b'alaw', b'ALAW', b'G722', b'sowt', b'SOWT'):
             raise Error('unsupported compression type')
         self.setnchannels(nchannels)
         self.setsampwidth(sampwidth)
@@ -764,28 +784,43 @@ class Aifc_write:
     #
 
     def _lin2alaw(self, data):
-        import audioop
+        with warnings.catch_warnings():
+            warnings.simplefilter('ignore', category=DeprecationWarning)
+            import audioop
         return audioop.lin2alaw(data, 2)
 
     def _lin2ulaw(self, data):
-        import audioop
+        with warnings.catch_warnings():
+            warnings.simplefilter('ignore', category=DeprecationWarning)
+            import audioop
         return audioop.lin2ulaw(data, 2)
 
     def _lin2adpcm(self, data):
-        import audioop
+        with warnings.catch_warnings():
+            warnings.simplefilter('ignore', category=DeprecationWarning)
+            import audioop
         if not hasattr(self, '_adpcmstate'):
             self._adpcmstate = None
         data, self._adpcmstate = audioop.lin2adpcm(data, 2, self._adpcmstate)
         return data
 
+    def _lin2sowt(self, data):
+        with warnings.catch_warnings():
+            warnings.simplefilter('ignore', category=DeprecationWarning)
+            import audioop
+        return audioop.byteswap(data, 2)
+
     def _ensure_header_written(self, datasize):
         if not self._nframeswritten:
-            if self._comptype in (b'ULAW', b'ulaw', b'ALAW', b'alaw', b'G722'):
+            if self._comptype in (b'ULAW', b'ulaw',
+                b'ALAW', b'alaw', b'G722',
+                b'sowt', b'SOWT'):
                 if not self._sampwidth:
                     self._sampwidth = 2
                 if self._sampwidth != 2:
                     raise Error('sample width must be 2 when compressing '
-                                'with ulaw/ULAW, alaw/ALAW or G7.22 (ADPCM)')
+                                'with ulaw/ULAW, alaw/ALAW, sowt/SOWT '
+                                'or G7.22 (ADPCM)')
             if not self._nchannels:
                 raise Error('# channels not specified')
             if not self._sampwidth:
@@ -801,6 +836,8 @@ class Aifc_write:
             self._convert = self._lin2ulaw
         elif self._comptype in (b'alaw', b'ALAW'):
             self._convert = self._lin2alaw
+        elif self._comptype in (b'sowt', b'SOWT'):
+            self._convert = self._lin2sowt
 
     def _write_header(self, initlength):
         if self._aifc and self._comptype != b'NONE':
@@ -920,10 +957,6 @@ def open(f, mode=None):
     else:
         raise Error("mode must be 'r', 'rb', 'w', or 'wb'")
 
-def openfp(f, mode=None):
-    warnings.warn("aifc.openfp is deprecated since Python 3.7. "
-                  "Use aifc.open instead.", DeprecationWarning, stacklevel=2)
-    return open(f, mode=mode)
 
 if __name__ == '__main__':
     import sys