diff options
| author | ghostop14 <ghostop14@gmail.com> | 2020-02-04 18:37:41 -0500 |
|---|---|---|
| committer | Michael Dickens <michael.dickens@ettus.com> | 2020-02-15 19:20:26 -0500 |
| commit | 012870af22ae873b3b998691de8e81752179d266 (patch) | |
| tree | d294d2d83b4f94b11922cf2873ebaf473bb36df3 /gr-blocks/lib/correctiq_impl.cc | |
| parent | f6a346d8b59050b2da520c80f7fab9d85018e350 (diff) | |
Blocks: Add DC Spike Removal and IQ Swap Native Blocks
This block incorporates the OOT modules in correctiq that provide
3 different techniques to remove the DC spike inherent in IQ sampling.
The first technique mirrors SDR GUI receivers with an IIR filter
approach, the second provides a time-limited IIR approach where after
a user-configurable number of seconds locks into a basic offset
correction to eliminate the effect of the filter on the signal while
maintaining the correction, and the last is manual I and Q
configurable offsets. The Swap IQ block is a drop-in block to help
correct for inverted spectrums and just swaps I<->Q.
Diffstat (limited to 'gr-blocks/lib/correctiq_impl.cc')
| -rw-r--r-- | gr-blocks/lib/correctiq_impl.cc | 64 |
1 files changed, 64 insertions, 0 deletions
diff --git a/gr-blocks/lib/correctiq_impl.cc b/gr-blocks/lib/correctiq_impl.cc new file mode 100644 index 0000000000..d44b36ddc0 --- /dev/null +++ b/gr-blocks/lib/correctiq_impl.cc @@ -0,0 +1,64 @@ +/* -*- c++ -*- */ +/* + * Copyright 2020 Free Software Foundation, Inc. + * + * This file is part of GNU Radio + * + * SPDX-License-Identifier: GPL-3.0-or-later + * + */ + +#ifdef HAVE_CONFIG_H +#include "config.h" +#endif + +#include "correctiq_impl.h" +#include <gnuradio/io_signature.h> + +namespace gr { +namespace blocks { + +correctiq::sptr correctiq::make() +{ + return gnuradio::get_initial_sptr(new correctiq_impl()); +} + +/* + * The private constructor + */ +correctiq_impl::correctiq_impl() + : gr::sync_block("correctiq", + gr::io_signature::make(1, 1, sizeof(gr_complex)), + gr::io_signature::make(1, 1, sizeof(gr_complex))), + d_avg_real(0.0), + d_avg_img(0.0), + d_ratio(1e-05f) +{ +} + +/* + * Our virtual destructor. + */ +correctiq_impl::~correctiq_impl() {} + +int correctiq_impl::work(int noutput_items, + gr_vector_const_void_star& input_items, + gr_vector_void_star& output_items) +{ + const gr_complex* in = (const gr_complex*)input_items[0]; + gr_complex* out = (gr_complex*)output_items[0]; + + for (int i = 0; i < noutput_items; i++) { + d_avg_real = d_ratio * (in[i].real() - d_avg_real) + d_avg_real; + d_avg_img = d_ratio * (in[i].imag() - d_avg_img) + d_avg_img; + + out[i].real(in[i].real() - d_avg_real); + out[i].imag(in[i].imag() - d_avg_img); + } + + // Tell runtime system how many output items we produced. + return noutput_items; +} + +} /* namespace blocks */ +} /* namespace gr */ |