1 files changed, 48 insertions, 0 deletions
diff --git a/src/libv27/psk.h b/src/libv27/psk.h
new file mode 100644
index 0000000..1dbaa07
--- /dev/null
+++ b/src/libv27/psk.h
@@ -0,0 +1,48 @@
+#include "../libfilter/iir_filter.h"
+#include "../libfilter/fir_filter.h"
+
+typedef struct psk_mod {
+	int		(*send_bit)(void *inst);
+	void		*inst;
+
+	double		symbol_pos;		/* current position in symbol */
+	double		symbols_per_sample;	/* change of position per sample */
+	double		phase_shift;		/* carrier phase shift */
+	double		carrier_phase;		/* current carrier phase */
+	double		carrier_phaseshift;	/* shift of phase per sample */
+
+	fir_filter_t	*lp[2];			/* filter for limiting spectrum */
+
+	int		spl_count;		/* SIT: counter for 30 samples (symbol duration) */
+	int		sym_list[5];		/* SIT: list of 5 symbols */
+	int		sym_count;		/* SIT: current list index */
+} psk_mod_t;
+
+typedef struct psk_demod {
+	void		(*receive_bit)(void *inst, int bit);
+	void		*inst;
+
+	double		carrier_phase;		/* current carrier phase */
+	double		carrier_phaseshift;	/* shift of phase per sample */
+
+	fir_filter_t	*lp[2];			/* filter for limiting spectrum */
+	iir_filter_t	lp_error[2];		/* filter for phase correction */
+	iir_filter_t	lp_clock;		/* filter for symbol clock */
+
+	uint16_t	last_phase_error;	/* error phase of last sample */
+	int32_t		phase_error;		/* current phase error */
+
+	sample_t	last_amplitude;		/* clock amplitude of last sample */
+	int		sample_delay;		/* delay of quarter symbol length in samples */
+	int		sample_timer;		/* counter to wait for the symbol's sample point */
+
+	uint8_t		last_sector;		/* sector of last symbol */
+} psk_demod_t;
+
+int psk_mod_init(psk_mod_t *psk, void *inst, int (*send_bit)(void *inst), int samplerate, double symbolrate);
+void psk_mod_exit(psk_mod_t *psk);
+void psk_mod(psk_mod_t *psk, sample_t *sample, int length);
+int psk_demod_init(psk_demod_t *psk, void *inst, void (*receive_bit)(void *inst, int bit), int samplerate, double symbolrate);
+void psk_demod_exit(psk_demod_t *psk);
+void psk_demod(psk_demod_t *psk, sample_t *sample, int length);
+