2020-06-15 07:42:16 +00:00
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# NanoVNASaver
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2020-06-25 17:52:30 +00:00
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#
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2020-06-15 07:42:16 +00:00
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# A python program to view and export Touchstone data from a NanoVNA
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2020-06-25 17:52:30 +00:00
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# Copyright (C) 2019, 2020 Rune B. Broberg
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# Copyright (C) 2020 NanoVNA-Saver Authors
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2019-10-04 10:51:20 +00:00
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#
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <https://www.gnu.org/licenses/>.
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import logging
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import math
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from PyQt5 import QtWidgets
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2020-06-15 09:28:38 +00:00
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from NanoVNASaver.Analysis import Analysis
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2020-06-21 18:54:23 +00:00
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from NanoVNASaver.Formatting import format_frequency
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2019-10-04 10:51:20 +00:00
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logger = logging.getLogger(__name__)
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2019-10-09 14:31:04 +00:00
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class BandStopAnalysis(Analysis):
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def __init__(self, app):
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super().__init__(app)
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self._widget = QtWidgets.QWidget()
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layout = QtWidgets.QFormLayout()
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self._widget.setLayout(layout)
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layout.addRow(QtWidgets.QLabel("Band stop filter analysis"))
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self.result_label = QtWidgets.QLabel()
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self.lower_cutoff_label = QtWidgets.QLabel()
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self.lower_six_db_label = QtWidgets.QLabel()
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self.lower_sixty_db_label = QtWidgets.QLabel()
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self.lower_db_per_octave_label = QtWidgets.QLabel()
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self.lower_db_per_decade_label = QtWidgets.QLabel()
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self.upper_cutoff_label = QtWidgets.QLabel()
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self.upper_six_db_label = QtWidgets.QLabel()
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self.upper_sixty_db_label = QtWidgets.QLabel()
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self.upper_db_per_octave_label = QtWidgets.QLabel()
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self.upper_db_per_decade_label = QtWidgets.QLabel()
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layout.addRow("Result:", self.result_label)
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layout.addRow(QtWidgets.QLabel(""))
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self.center_frequency_label = QtWidgets.QLabel()
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self.span_label = QtWidgets.QLabel()
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self.six_db_span_label = QtWidgets.QLabel()
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self.quality_label = QtWidgets.QLabel()
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layout.addRow("Center frequency:", self.center_frequency_label)
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layout.addRow("Bandwidth (-3 dB):", self.span_label)
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layout.addRow("Quality factor:", self.quality_label)
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layout.addRow("Bandwidth (-6 dB):", self.six_db_span_label)
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layout.addRow(QtWidgets.QLabel(""))
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layout.addRow(QtWidgets.QLabel("Lower side:"))
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layout.addRow("Cutoff frequency:", self.lower_cutoff_label)
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layout.addRow("-6 dB point:", self.lower_six_db_label)
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layout.addRow("-60 dB point:", self.lower_sixty_db_label)
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layout.addRow("Roll-off:", self.lower_db_per_octave_label)
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layout.addRow("Roll-off:", self.lower_db_per_decade_label)
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layout.addRow(QtWidgets.QLabel(""))
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layout.addRow(QtWidgets.QLabel("Upper side:"))
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layout.addRow("Cutoff frequency:", self.upper_cutoff_label)
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layout.addRow("-6 dB point:", self.upper_six_db_label)
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layout.addRow("-60 dB point:", self.upper_sixty_db_label)
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layout.addRow("Roll-off:", self.upper_db_per_octave_label)
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layout.addRow("Roll-off:", self.upper_db_per_decade_label)
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def reset(self):
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self.result_label.clear()
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self.span_label.clear()
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self.quality_label.clear()
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self.six_db_span_label.clear()
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self.upper_cutoff_label.clear()
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self.upper_six_db_label.clear()
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self.upper_sixty_db_label.clear()
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self.upper_db_per_octave_label.clear()
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self.upper_db_per_decade_label.clear()
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self.lower_cutoff_label.clear()
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self.lower_six_db_label.clear()
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self.lower_sixty_db_label.clear()
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self.lower_db_per_octave_label.clear()
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self.lower_db_per_decade_label.clear()
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def runAnalysis(self):
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self.reset()
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if len(self.app.data21) == 0:
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logger.debug("No data to analyse")
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self.result_label.setText("No data to analyse.")
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return
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peak_location = -1
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2019-11-17 12:51:20 +00:00
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peak_db = self.app.data21[0].gain
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2019-10-09 14:31:04 +00:00
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for i in range(len(self.app.data21)):
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2019-11-17 12:51:20 +00:00
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db = self.app.data21[i].gain
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2019-10-09 14:31:04 +00:00
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if db > peak_db:
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peak_db = db
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peak_location = i
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2020-07-09 08:45:43 +00:00
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logger.debug("Found peak of %f at %d", peak_db, self.app.data11[peak_location].freq)
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2019-10-09 14:31:04 +00:00
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lower_cutoff_location = -1
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pass_band_db = peak_db
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for i in range(len(self.app.data21)):
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2019-11-17 12:51:20 +00:00
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if (pass_band_db - self.app.data21[i].gain) > 3:
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2019-10-09 14:31:04 +00:00
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# We found the cutoff location
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lower_cutoff_location = i
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break
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lower_cutoff_frequency = self.app.data21[lower_cutoff_location].freq
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2019-11-17 12:51:20 +00:00
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lower_cutoff_gain = self.app.data21[lower_cutoff_location].gain - pass_band_db
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2019-10-09 14:31:04 +00:00
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if lower_cutoff_gain < -4:
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2020-06-15 11:27:00 +00:00
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logger.debug("Lower cutoff frequency found at %f dB"
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" - insufficient data points for true -3 dB point.",
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2019-10-09 14:31:04 +00:00
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lower_cutoff_gain)
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logger.debug("Found true lower cutoff frequency at %d", lower_cutoff_frequency)
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2020-06-21 18:54:23 +00:00
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self.lower_cutoff_label.setText(
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f"{format_frequency(lower_cutoff_frequency)}"
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f" ({round(lower_cutoff_gain, 1)} dB)")
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2019-10-09 14:31:04 +00:00
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self.app.markers[1].setFrequency(str(lower_cutoff_frequency))
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self.app.markers[1].frequencyInput.setText(str(lower_cutoff_frequency))
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upper_cutoff_location = -1
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for i in range(len(self.app.data21)-1, -1, -1):
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2019-11-17 12:51:20 +00:00
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if (pass_band_db - self.app.data21[i].gain) > 3:
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2019-10-09 14:31:04 +00:00
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# We found the cutoff location
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upper_cutoff_location = i
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break
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upper_cutoff_frequency = self.app.data21[upper_cutoff_location].freq
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2019-11-17 12:51:20 +00:00
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upper_cutoff_gain = self.app.data21[upper_cutoff_location].gain - pass_band_db
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2019-10-09 14:31:04 +00:00
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if upper_cutoff_gain < -4:
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2020-06-15 11:27:00 +00:00
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logger.debug("Upper cutoff frequency found at %f dB"
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" - insufficient data points for true -3 dB point.",
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2019-10-09 14:31:04 +00:00
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upper_cutoff_gain)
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logger.debug("Found true upper cutoff frequency at %d", upper_cutoff_frequency)
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2020-06-21 18:54:23 +00:00
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self.upper_cutoff_label.setText(
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f"{format_frequency(upper_cutoff_frequency)}"
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f" ({round(upper_cutoff_gain, 1)} dB)")
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2019-10-09 14:31:04 +00:00
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self.app.markers[2].setFrequency(str(upper_cutoff_frequency))
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self.app.markers[2].frequencyInput.setText(str(upper_cutoff_frequency))
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span = upper_cutoff_frequency - lower_cutoff_frequency
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center_frequency = math.sqrt(lower_cutoff_frequency * upper_cutoff_frequency)
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q = center_frequency / span
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2020-06-21 18:54:23 +00:00
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self.span_label.setText(format_frequency(span))
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self.center_frequency_label.setText(
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format_frequency(center_frequency))
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2019-10-09 14:31:04 +00:00
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self.quality_label.setText(str(round(q, 2)))
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self.app.markers[0].setFrequency(str(round(center_frequency)))
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self.app.markers[0].frequencyInput.setText(str(round(center_frequency)))
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# Lower roll-off
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lower_six_db_location = -1
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for i in range(lower_cutoff_location, len(self.app.data21)):
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2019-11-17 12:51:20 +00:00
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if (pass_band_db - self.app.data21[i].gain) > 6:
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2019-10-09 14:31:04 +00:00
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# We found 6dB location
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lower_six_db_location = i
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break
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if lower_six_db_location < 0:
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self.result_label.setText("Lower 6 dB location not found.")
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return
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lower_six_db_cutoff_frequency = self.app.data21[lower_six_db_location].freq
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2020-06-21 18:54:23 +00:00
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self.lower_six_db_label.setText(
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format_frequency(lower_six_db_cutoff_frequency))
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2019-10-09 14:31:04 +00:00
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ten_db_location = -1
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for i in range(lower_cutoff_location, len(self.app.data21)):
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2019-11-17 12:51:20 +00:00
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if (pass_band_db - self.app.data21[i].gain) > 10:
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2019-10-09 14:31:04 +00:00
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# We found 6dB location
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ten_db_location = i
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break
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twenty_db_location = -1
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for i in range(lower_cutoff_location, len(self.app.data21)):
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2019-11-17 12:51:20 +00:00
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if (pass_band_db - self.app.data21[i].gain) > 20:
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2019-10-09 14:31:04 +00:00
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# We found 6dB location
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twenty_db_location = i
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break
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sixty_db_location = -1
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for i in range(lower_six_db_location, len(self.app.data21)):
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2019-11-17 12:51:20 +00:00
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if (pass_band_db - self.app.data21[i].gain) > 60:
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2019-10-09 14:31:04 +00:00
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# We found 60dB location! Wow.
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sixty_db_location = i
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2019-10-05 13:43:23 +00:00
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break
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2019-10-09 14:31:04 +00:00
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if sixty_db_location > 0:
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sixty_db_cutoff_frequency = self.app.data21[sixty_db_location].freq
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2020-06-15 11:27:00 +00:00
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self.lower_sixty_db_label.setText(
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2020-06-21 18:54:23 +00:00
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format_frequency(sixty_db_cutoff_frequency))
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2019-10-14 17:14:10 +00:00
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elif ten_db_location != -1 and twenty_db_location != -1:
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ten = self.app.data21[ten_db_location].freq
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twenty = self.app.data21[twenty_db_location].freq
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sixty_db_frequency = ten * 10 ** (5 * (math.log10(twenty) - math.log10(ten)))
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2020-06-15 11:27:00 +00:00
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self.lower_sixty_db_label.setText(
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2020-06-21 18:54:23 +00:00
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f"{format_frequency(sixty_db_frequency)} (derived)")
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2019-10-09 14:31:04 +00:00
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else:
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self.lower_sixty_db_label.setText("Not calculated")
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2020-06-15 11:27:00 +00:00
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if (ten_db_location > 0 and
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twenty_db_location > 0 and
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ten_db_location != twenty_db_location):
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octave_attenuation, decade_attenuation = self.calculateRolloff(
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ten_db_location, twenty_db_location)
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self.lower_db_per_octave_label.setText(
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f"{round(octave_attenuation, 3)} dB / octave")
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self.lower_db_per_decade_label.setText(
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f"{round(decade_attenuation, 3)} dB / decade")
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2019-10-09 14:31:04 +00:00
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else:
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self.lower_db_per_octave_label.setText("Not calculated")
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self.lower_db_per_decade_label.setText("Not calculated")
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# Upper roll-off
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upper_six_db_location = -1
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for i in range(upper_cutoff_location, -1, -1):
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2019-11-17 12:51:20 +00:00
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if (pass_band_db - self.app.data21[i].gain) > 6:
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2019-10-09 14:31:04 +00:00
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# We found 6dB location
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upper_six_db_location = i
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break
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if upper_six_db_location < 0:
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self.result_label.setText("Upper 6 dB location not found.")
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return
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upper_six_db_cutoff_frequency = self.app.data21[upper_six_db_location].freq
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2020-06-21 18:54:23 +00:00
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self.upper_six_db_label.setText(
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format_frequency(upper_six_db_cutoff_frequency))
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2019-10-09 14:31:04 +00:00
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six_db_span = upper_six_db_cutoff_frequency - lower_six_db_cutoff_frequency
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2020-06-21 18:54:23 +00:00
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self.six_db_span_label.setText(
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format_frequency(six_db_span))
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2019-10-09 14:31:04 +00:00
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ten_db_location = -1
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for i in range(upper_cutoff_location, -1, -1):
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2019-11-17 12:51:20 +00:00
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if (pass_band_db - self.app.data21[i].gain) > 10:
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2019-10-09 14:31:04 +00:00
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# We found 6dB location
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ten_db_location = i
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break
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twenty_db_location = -1
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for i in range(upper_cutoff_location, -1, -1):
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2019-11-17 12:51:20 +00:00
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if (pass_band_db - self.app.data21[i].gain) > 20:
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2019-10-09 14:31:04 +00:00
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# We found 6dB location
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twenty_db_location = i
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break
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sixty_db_location = -1
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for i in range(upper_six_db_location, -1, -1):
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2019-11-17 12:51:20 +00:00
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if (pass_band_db - self.app.data21[i].gain) > 60:
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2019-10-09 14:31:04 +00:00
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# We found 60dB location! Wow.
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sixty_db_location = i
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break
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if sixty_db_location > 0:
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sixty_db_cutoff_frequency = self.app.data21[sixty_db_location].freq
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2020-06-15 11:27:00 +00:00
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self.upper_sixty_db_label.setText(
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2020-06-21 18:54:23 +00:00
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format_frequency(sixty_db_cutoff_frequency))
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2019-10-14 17:14:10 +00:00
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elif ten_db_location != -1 and twenty_db_location != -1:
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ten = self.app.data21[ten_db_location].freq
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twenty = self.app.data21[twenty_db_location].freq
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2020-06-15 11:27:00 +00:00
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sixty_db_frequency = ten * 10 ** (
|
|
|
|
5 * (math.log10(twenty) - math.log10(ten)))
|
|
|
|
self.upper_sixty_db_label.setText(
|
2020-06-21 18:54:23 +00:00
|
|
|
f"{format_frequency(sixty_db_frequency)} (derived)")
|
2019-10-09 14:31:04 +00:00
|
|
|
else:
|
2019-10-05 13:43:23 +00:00
|
|
|
self.upper_sixty_db_label.setText("Not calculated")
|
|
|
|
|
2020-06-15 11:27:00 +00:00
|
|
|
if (ten_db_location > 0 and
|
|
|
|
twenty_db_location > 0 and
|
|
|
|
ten_db_location != twenty_db_location):
|
|
|
|
octave_attenuation, decade_attenuation = self.calculateRolloff(
|
|
|
|
ten_db_location, twenty_db_location)
|
|
|
|
self.upper_db_per_octave_label.setText(
|
|
|
|
f"{round(octave_attenuation, 3)} dB / octave")
|
|
|
|
self.upper_db_per_decade_label.setText(
|
|
|
|
f"{round(decade_attenuation, 3)} dB / decade")
|
2019-10-05 13:43:23 +00:00
|
|
|
else:
|
2019-10-09 14:08:19 +00:00
|
|
|
self.upper_db_per_octave_label.setText("Not calculated")
|
|
|
|
self.upper_db_per_decade_label.setText("Not calculated")
|
2019-10-05 13:43:23 +00:00
|
|
|
|
2019-10-07 13:29:34 +00:00
|
|
|
if upper_cutoff_gain < -4 or lower_cutoff_gain < -4:
|
2020-06-15 11:27:00 +00:00
|
|
|
self.result_label.setText(
|
2020-07-09 08:45:43 +00:00
|
|
|
f"Analysis complete ({len(self.app.data11)} points)\n"
|
2020-06-15 11:27:00 +00:00
|
|
|
f"Insufficient data for analysis. Increase segment count.")
|
2019-10-07 13:29:34 +00:00
|
|
|
else:
|
2020-06-15 11:27:00 +00:00
|
|
|
self.result_label.setText(
|
2020-07-09 08:45:43 +00:00
|
|
|
f"Analysis complete ({len(self.app.data11)} points)")
|