diff options
| author | Daniel Estévez <daniel@destevez.net> | 2021-06-06 11:25:57 +0200 |
|---|---|---|
| committer | mormj <34754695+mormj@users.noreply.github.com> | 2021-06-12 12:01:12 -0400 |
| commit | 51c504ebb1ca21c5f7071826c1af03e45e391a65 (patch) | |
| tree | dbabf0b0b825f834cff2067248d193fe8d951dd8 /gr-digital/lib/diff_encoder_bb_impl.h | |
| parent | 16d1b0215d59c52009b09867fbfce0b4c3585add (diff) | |
digital: Add NRZI option to differential en/decoder
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>
Diffstat (limited to 'gr-digital/lib/diff_encoder_bb_impl.h')
| -rw-r--r-- | gr-digital/lib/diff_encoder_bb_impl.h | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/gr-digital/lib/diff_encoder_bb_impl.h b/gr-digital/lib/diff_encoder_bb_impl.h index ed8ead0330..03d3f83a19 100644 --- a/gr-digital/lib/diff_encoder_bb_impl.h +++ b/gr-digital/lib/diff_encoder_bb_impl.h @@ -1,6 +1,7 @@ /* -*- c++ -*- */ /* * Copyright 2006,2012 Free Software Foundation, Inc. + * Copyright 2021 Daniel Estevez <daniel@destevez.net> * * This file is part of GNU Radio * @@ -19,7 +20,8 @@ namespace digital { class diff_encoder_bb_impl : public diff_encoder_bb { public: - diff_encoder_bb_impl(unsigned int modulus); + diff_encoder_bb_impl(unsigned int modulus, + enum diff_coding_type coding = DIFF_DIFFERENTIAL); ~diff_encoder_bb_impl() override; int work(int noutput_items, @@ -29,6 +31,7 @@ public: private: unsigned int d_last_out; const unsigned int d_modulus; + const enum diff_coding_type d_coding; }; } /* namespace digital */ |