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Uladzimir KarpenkaandClaude Opus 4.8
65cb3c386e
Model the pair on fmd.c / fmmod.c, but with the parts that a 75 kHz
deviation forces:
- the demodulator discriminates with arg(x[n] * conj(x[n-1])) rather
than a PLL; an omegaN in the tens of kHz cannot track 75 kHz.
- emphasis is a one-pole RC (tau 75 us) on both ends, not fmd's 1/f
fc_impulse FIR. A 1/f FIR from f_low = 20 Hz would sit ~+57 dB at
20 Hz, where broadcast FM specifies flat below the corner.
- TXA_WFM leaves the shared preemph block off; wfmmod carries its own.
- wfmmod clamps bp_fc = deviation + f_high to 0.45 * samplerate, since
+/-90 kHz exceeds Nyquist at the rates the narrowband modes use.
Scope is mono: no 19 kHz pilot, no 38 kHz stereo subcarrier, no RDS.
Both mode enums are appended to so the ABI stays stable for clients.
The JNI bindings are deliberately left alone.
Verified against a wfmmod -> wfmd loopback: the discriminator is exact,
the dc-removal one-pole tracks |H_lp(f)| * ain * sdelta to ratio 1.000,
and a 700 + 1900 Hz two-tone comes back with THD+N ~ 3e-5 % at +/-37.5
kHz deviation. Note the demodulator aliases unless samplerate exceeds
2 * deviation * |aud|max, so 192 kHz is the practical floor.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
162 lines
4.5 KiB
C
162 lines
4.5 KiB
C
/* comm.h
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This file is part of a program that implements a Software-Defined Radio.
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Copyright (C) 2013, 2024, 2025 Warren Pratt, NR0V
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License
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as published by the Free Software Foundation; either version 2
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of the License, or (at your option) any later version.
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This program 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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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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The author can be reached by email at
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warren@wpratt.com
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*/
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#if defined(linux) || defined(__APPLE__)
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#include <stdlib.h>
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#include <pthread.h>
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#include <semaphore.h>
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#include <string.h>
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#include "linux_port.h"
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#endif
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#ifdef _WIN32
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#include <Windows.h>
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#include <process.h>
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#include <intrin.h>
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#endif
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#include <math.h>
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#include <stdint.h>
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#include <time.h>
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#ifdef _WIN32
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#include <avrt.h>
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#endif
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#include "fftw3.h"
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#include "amd.h"
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#include "ammod.h"
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#include "amsq.h"
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#include "analyzer.h"
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#include "anf.h"
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#include "anr.h"
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#include "apfshadow.h"
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#include "bandpass.h"
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#include "calcc.h"
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#include "cblock.h"
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#include "cfcomp.h"
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#include "cfir.h"
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#include "channel.h"
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#include "cmath.h"
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#include "compress.h"
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#include "delay.h"
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#include "dexp.h"
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#include "div.h"
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#include "doublepole.h"
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#include "eer.h"
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#include "emnr.h"
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#include "rnnr.h" // NR3 + NR4 support
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#include "sbnr.h" // NR3 + NR4 support
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#include "emph.h"
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#include "eq.h"
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#include "fastmath.h"
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#include "fcurve.h"
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#include "fir.h"
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#include "firmin.h"
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#include "fmd.h"
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#include "fmmod.h"
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#include "fmsq.h"
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#include "wfmd.h"
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#include "wfmmod.h"
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#include "gain.h"
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#include "gaussian.h"
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#include "gen.h"
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#include "icfir.h"
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#include "iir.h"
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#include "impulse_cache.h"
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#include "iobuffs.h"
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#include "iqc.h"
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#include "lmath.h"
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#include "main.h"
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#include "matchedCW.h"
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#include "meter.h"
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#include "meterlog10.h"
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#include "nbp.h"
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#include "nob.h"
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#include "nobII.h"
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#include "osctrl.h"
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#include "patchpanel.h"
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#include "resample.h"
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#include "rmatch.h"
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#include "RXA.h"
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#include "sender.h"
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#include "shift.h"
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#include "siphon.h"
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#include "slew.h"
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#include "snb.h"
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#include "ssql.h"
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#include "syncbuffs.h"
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#include "TXA.h"
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#include "utilities.h"
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#include "varsamp.h"
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#include "wcpAGC.h"
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// manage differences among consoles
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#define _Thetis
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// channel definitions
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#define MAX_CHANNELS 32 // maximum number of supported channels
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#define DSP_MULT 2 // number of dsp_buffsizes that are held in an iobuff pseudo-ring
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#define INREAL float // data type for channel input buffer
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#define OUTREAL float // data type for channel output buffer
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// display definitions
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#define dMAX_DISPLAYS 72 // maximum number of displays = max instances
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#define dMAX_STITCH 4 // maximum number of sub-spans to stitch together
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#define dMAX_NUM_FFT 1 // maximum number of ffts for an elimination
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#define dMAX_PIXELS 16384 // maximum number of pixels that can be requested
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#define dMAX_AVERAGE 60 // maximum number of pixel frames that will be window-averaged
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#ifdef _Thetis
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#define dINREAL double
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#else
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#define dINREAL float
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#endif
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#define dOUTREAL float
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#define dSAMP_BUFF_MULT 2 // ratio of input sample buffer size to fft size (for overlap)
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#define dNUM_PIXEL_BUFFS 3 // number of pixel output buffers
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#define dMAX_M 1 // number of variables to calibrate
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#define dMAX_N 100 // maximum number of frequencies at which to calibrate
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#define dMAX_CAL_SETS 2 // maximum number of calibration data sets
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#define dMAX_PIXOUTS 4 // maximum number of det/avg/outputs per display instance
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// wisdom definitions
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#define MAX_WISDOM_SIZE_DISPLAY 262144
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#define MAX_WISDOM_SIZE_FILTER 262144 // was 32769
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// math definitions
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#define PI 3.1415926535897932
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#define TWOPI 6.2831853071795864
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// Non-aliasing qualifier for DSP buffers. Spelled __restrict rather than
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// restrict because the JNI translation unit is compiled as -std=gnu89.
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#if defined(__GNUC__) || defined(__clang__) || defined(_MSC_VER)
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#define WDSP_RESTRICT __restrict
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#else
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#define WDSP_RESTRICT
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#endif
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// miscellaneous
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typedef double complex[2];
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#define PORT __declspec( dllexport )
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