kg4sgp

// Goertzel Demodulator
//
// This program demodulates two tone FSK using the goertzel algorithm.

#include <stdio.h>
#include <math.h>

struct gConstants {
  float f1norm;
  float f2norm;

kg4sgp

// Arduino RTTY Modulator
// Uses Fast PWM to produce ~8kHz 8bit audio

#include "baudot.h"
#include "pwmsine.h"

// Yeah, I really need to get rid of these globals.
// Thats next on the to-do list

unsigned int sampleRate = 31250;

kg4sgp

// An ASK Demodulator
// Simplicity first. Get it working, then improve!
// gcc ask-demod.c -o askdemod -lm -Wall
// Usage: ./ask-demod ask-msg.raw ask-msg.txt

#include <stdio.h>
#include <stdlib.h>
#include <math.h>
#include <string.h>

kg4sgp

/* This produces raised cosine bpsk*/

#include <stdio.h>
#include <stdlib.h>
#include <math.h>

typedef struct {
	long sample_rate;
	long samples_per_symbol;
	long max_amp;