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Signed-off-by: Josh Morman <jmorman@gnuradio.org>
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All of the removed `from __future__ import` were needed in older
versions of Python (mostly 2.5.x and below) but later became mandatory
in most versions of Python 3 hence are not necessary anymore.
More specifically, according to __future__.py[1]:
- unicode_literals is part of Python since versions 2.6.0 and 3.0.0;
- print_function is part of Python since versions 2.6.0 and 3.0.0;
- absolute_import is part of Python since versions 2.5.0 and 3.0.0;
- division is part of Python since versions 2.2.0 and 3.0.0;
Get rid of those unnecessary imports to slightly clean up the codebase.
[1] https://github.com/python/cpython/blob/master/Lib/__future__.py
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An automatic conversion for python3 mangled the source and introduced a bug.
This commit fixes the conversion bug in fm_preemph. Changeset that lead to this
bug still has to be analyzed further.
Fixes #2286
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Resolves #2121 DeprecationWarning: invalid escape sequence /
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Manual merge conflict resolution has been applied to following
conflicts:
* Typos:
* gnuradio-runtime/python/gnuradio/ctrlport/GrDataPlotter.py
* gr-blocks/python/blocks/qa_wavfile.py
* gr-filter/examples/gr_filtdes_api.py
* grc/blocks/parameter.xml
* gr-uhd/python/uhd/__init__.py
* ValueError -> RuntimeError:
* gr-blocks/python/blocks/qa_hier_block2.py
* relative Imports & other Py3k:
* gr-digital/python/digital/psk_constellations.py
* gr-digital/python/digital/qam_constellations.py
* gr-digital/python/digital/test_soft_decisions.py
* gr-digital/python/digital/gfsk.py
* SequenceCompleter:
* gr-utils/python/modtool/modtool_add.py
* gr-utils/python/modtool/modtool_rename.py
* gr-utils/python/modtool/modtool_rm.py
* Updated API on next:
* gr-blocks/grc/blocks_file_source.xml
* gr-blocks/python/blocks/qa_file_source_sink.py
* gr-qtgui/grc/qtgui_time_sink_x.xml
* GRC Py3k Updates:
* grc/core/Block.py
* grc/core/Constants.py
* grc/core/Platform.py
* grc/core/utils/odict.py
* grc/gui/Actions.py
* grc/gui/Block.py
* grc/gui/Executor.py
* grc/gui/Port.py
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Luzpaz went ahead and found typos using `codespell -q 3`.
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The FM preemphasis filter design now precludes the user from
inducing a pole on the unit circle at z = -1.0 and z = 1.0.
A pole at either of these locations makes the filter unstable and
useless: feeding back "+/-inf" into an IIR filter has no good
recovery.
Also provide a reasonable, maximally safe default of 0.925*fs/2.0
for the high frequency corner, fh. This keeps the slope of the
preemphasis filter looking reasonable sane in the whole band; at
least for tau=75e-6 and fs=48000.
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In redesign of the FM emphasis filters, I fell into the gr-filter
implementation trap of the default "oldstyle=True" taps.
This caused the pole of the IIR filter to be reflected about the
z = j w axis, resulting in an incorrect filter.
Set the filters to use newstyle taps.
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Add working filters designs for the FM preemphasis Tx filter.
Rework the FM deemphasis Rx filter as it was easier to rederive
the transfer function, than to determine if the one in use was correct.
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