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This adds an option to the differential encoder an decoder blocks
to perform NRZI encoding and decoding. NRZI only makes sense with
a modulus of 2, so the blocks constructors will throw and exception
if passed nrzi = true and a modulus different from 2.
The GRC blocks handle this by hiding the modulus field if the user
selects NRZI encoding.
A new unit test for the NRZI version of the blocks is added. Besides
checking that encode plus decode gives the original, this test also
compares the C++ implementation results against a Numpy implementation.
Additionally, a faster implementation of differential encoding/
decoding for modulus 2 is included here.
Signed-off-by: Daniel Estévez <daniel@destevez.net>
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Most of this code is automated code changes:
```
set -e
SUB="s/dummy/dummy/"
for i in shared_ptr make_shared dynamic_pointer_cast weak_ptr enable_shared_from_this get_deleter; do
SUB="$SUB;s/boost::$i/std::$i/g"
done
SUB="$SUB;s^#include <boost/shared_ptr.hpp>^#include <memory>^g"
SUB="$SUB;s^namespace boost^namespace std^g"
find . \( -name "*.cc" -o -name "*.h" -o -name "*.i" -o -name "*.cxx" -o -name "*.py" \) -print0 | xargs -0 sed -i "$SUB"
```
Only one manual change. In `./gr-fec/lib/fec_mtrx_impl.cc`, add
`#include <algorithm>`.
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Found via `codespell -q 3 -L ans,sinc,hist,ist,ith,uint,fo -S ./volk`
Fix typos in gnuradio-runtime/
Fix typos in gr-digital/
Fix typos in gr-qtgui/
Fix typos in gr-channels/
Fix typos in grc/
Fix typos gr-filter/
Fix typos in gr-uhd/
Fix typos in gr-blocks/
Fix typos in gr-fec/
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