Change stream naming from f{id} to DSPFilter{id}

- DSPFilter{id} more accurately represents DSP filter configurations
- Clearer naming: explicitly mentions Digital Signal Processing
- Works correctly even when filtering is disabled (DSPFilter0 = configuration 0)
- Updated tests to reflect new naming convention

The stream name format is now: stream{id}_{Hz}Hz_{mV}mVRange_DSPFilter{id}

Examples:
- stream0_32000Hz_100mVRange_DSPFilter0 (eye-tracking, low-cut disabled)
- stream1_32000Hz_1mVRange_DSPFilter1 (ephys, low-cut enabled)

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <[email protected]>

Author: h-mayorquin

neo/rawio/neuralynxrawio/neuralynxrawio.py

@@ -496,9 +496,9 @@ def _parse_header(self):
 
                 # Unpack stream_key and format stream name
                 sampling_rate, input_range, gain, input_inverted, filter_params_tuple = stream_key
-                filter_id = seen_filters[filter_params_tuple]
+                dsp_filter_id = seen_filters[filter_params_tuple]
                 voltage_mv = int(input_range / 1000) if input_range is not None else 0
-                stream_name = f"stream{stream_id}_{int(sampling_rate)}Hz_{voltage_mv}mVRange_f{filter_id}"
+                stream_name = f"stream{stream_id}_{int(sampling_rate)}Hz_{voltage_mv}mVRange_DSPFilter{dsp_filter_id}"
 
                 stream_names.append(stream_name)
                 stream_ids.append(stream_id)

neo/test/rawiotest/test_neuralynxrawio.py

@@ -233,14 +233,14 @@ def test_two_streams_different_header_encoding(self):
         # Check stream names follow the new naming convention
         stream_names = [rawio.header["signal_streams"][i][0] for i in range(rawio.signal_streams_count())]
 
-        # Stream names should include sampling rate (Hz), voltage range (mV), and filter ID
+        # Stream names should include sampling rate (Hz), voltage range (mV), and DSP filter ID
         for stream_name in stream_names:
-            self.assertRegex(stream_name, r"stream\d+_\d+Hz_\d+mVRange_f\d+")
+            self.assertRegex(stream_name, r"stream\d+_\d+Hz_\d+mVRange_DSPFilter\d+")
 
         # Verify we have the expected streams:
         # - Eye-tracking channels (CSC145, CSC146): 32000Hz, 100mV range, low-cut disabled
-        # - Ephys channel (csc23_100): 32000Hz, 1mV range, low-cut enabled
-        expected_names = {"stream0_32000Hz_100mVRange_f0", "stream1_32000Hz_1mVRange_f1"}
+        # - Ephys channel (CSC76): 32000Hz, 1mV range, low-cut enabled
+        expected_names = {"stream0_32000Hz_100mVRange_DSPFilter0", "stream1_32000Hz_1mVRange_DSPFilter1"}
         self.assertEqual(set(stream_names), expected_names)
 
         # Verify filter configurations are stored privately