kopia lustrzana https://github.com/ag1le/morse-wip
84 wiersze
2.4 KiB
C++
84 wiersze
2.4 KiB
C++
// ----------------------------------------------------------------------------
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// likhd.c -- bayesian morse code decoder
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//
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// Copyright (C) 2012-2014
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// (C) Mauri Niininen, AG1LE
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//
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// This file is part of Bayesian Morse code decoder
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// bmorse is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// bmorse is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with bmorse. If not, see <http://www.gnu.org/licenses/>.
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// ---------------------------------------------------------------------------
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#include "bmorse.h"
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#include <stdio.h>
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int morse::likhd_(real z, real rn, integer ip, integer lambda, real dur, integer ilrate)
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{
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/* Local variables */
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static integer i, j, k, n;
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static real pinr;
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static integer ilx, ixs;
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static real lkhdj;
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static integer kelem;
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static integer israte;
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/* THIS SUBROUTINE CALCULATES,FOR EACH PATH */
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/* EXTENSION TO STATE N, THE LIKELIHOOD OF THAT */
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/* TRANSITION GIVEN THE MEASUREMENTZ. IT USES */
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/* AN ARRAY OF LINEAR (KALMAN) FILTERS TO DO SO. */
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/* VARIABLES: */
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/* Z- INPUT MEASUREMENT */
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/* RN- INPUT NOISE POWER ESTIMATE */
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/* IP- INPUT SAVED PATH IDENTITY */
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/* LAMBDA- INPUT SAVED LTR STATE IDENTITY */
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/* DUR- INPUT SAVED DURATION OF ELEMENT ON PATH IP */
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/* ILRATE- INPUT SAVED DATA RATE (SPEED) */
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/* P- INPUT TRANSITION PROBABILITIES */
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/* LKHD- OUTPUT COMPUTED LIKELIHOODS FOR EACH TRANS */
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/* SUBROUTINES USED: */
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/* KALFIL-KALMAN FILTER FOR EACH NEW PATH */
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/* OBTAIN SAVED KEYSTATE: */
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/* Function Body */
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if (lambda == 0)
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return 0;
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kelem = ilami[ielmst[lambda - 1] - 1];
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/* FOR EACH STATE: */
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for (k = 1; k <= 6; ++k) {
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for (i = 1; i <= 5; ++i) {
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/* OBTAIN KEYSTATE, RATE STATE, STATE N, NEW NODE: */
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ixs = isx[k - 1];
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israte = i;
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n = (i - 1) * 6 + k;
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j = (ip ) * 30 + n;
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pinr = pin[n-1][ip];
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/* COMPUTE AND STORE LIKELIHOOD: */
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lkhd[n-1][ip] = kalfil_(z, ip, rn, ixs, kelem, j, israte, dur, ilrate, pinr);
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}
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}
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return 0;
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} /* likhd_ */
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