3 * Copyright 2005,2010 Free Software Foundation, Inc.
5 * This file is part of GNU Radio
7 * GNU Radio is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 3, or (at your option)
12 * GNU Radio is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
17 * You should have received a copy of the GNU General Public License
18 * along with GNU Radio; see the file COPYING. If not, write to
19 * the Free Software Foundation, Inc., 51 Franklin Street,
20 * Boston, MA 02110-1301, USA.
27 #include <gr_nlog10_ff.h>
28 #include <gr_io_signature.h>
32 gr_make_nlog10_ff (float n, unsigned vlen, float k)
34 return gnuradio::get_initial_sptr(new gr_nlog10_ff(n, vlen, k));
37 gr_nlog10_ff::gr_nlog10_ff(float n, unsigned vlen, float k)
38 : gr_sync_block("nlog10_ff",
39 gr_make_io_signature(1, 1, sizeof(float) * vlen),
40 gr_make_io_signature(1, 1, sizeof(float) * vlen)),
41 d_vlen(vlen), d_n(n), d_k(k)
45 gr_nlog10_ff::~gr_nlog10_ff()
50 gr_nlog10_ff::work (int noutput_items,
51 gr_vector_const_void_star &input_items,
52 gr_vector_void_star &output_items)
54 const float *in = (const float *) input_items[0];
55 float *out = (float *) output_items[0];
56 int noi = noutput_items * d_vlen;
60 for (int i = 0; i < noi; i++)
61 out[i] = n * log10(std::max(in[i], (float) 1e-18)) + k;