Collaboration diagram for SSTV frequency specifications.:

Macros
#define	SSTVENC_FREQ_VIS_BIT1 (1100)

#define	SSTVENC_FREQ_SYNC (1200)

#define	SSTVENC_FREQ_VIS_BIT0 (1300)

#define	SSTVENC_FREQ_BLACK (1500)

#define	SSTVENC_FREQ_VIS_START (1900)

#define	SSTVENC_FREQ_WHITE (2300)

#define	SSTVENC_FREQ_FSKID_BIT1 (1900)

#define	SSTVENC_FREQ_FSKID_BIT0 (2100)

Functions
uint16_t	sstvenc_level_freq (uint8_t level)

Detailed Description

Macro Definition Documentation

◆ SSTVENC_FREQ_BLACK

#define SSTVENC_FREQ_BLACK (1500)

Definition at line 21 of file sstvfreq.h.

Referenced by sstvenc_level_freq().

◆ SSTVENC_FREQ_FSKID_BIT0

#define SSTVENC_FREQ_FSKID_BIT0 (2100)

Definition at line 26 of file sstvfreq.h.

Referenced by sstvenc_encoder_next_fsk_pulse().

◆ SSTVENC_FREQ_FSKID_BIT1

#define SSTVENC_FREQ_FSKID_BIT1 (1900)

Definition at line 25 of file sstvfreq.h.

Referenced by sstvenc_encoder_next_fsk_pulse().

◆ SSTVENC_FREQ_SYNC

#define SSTVENC_FREQ_SYNC (1200)

Definition at line 19 of file sstvfreq.h.

Referenced by sstvenc_encoder_next_vis_pulse(), and sstvenc_modulator_init().

◆ SSTVENC_FREQ_VIS_BIT0

#define SSTVENC_FREQ_VIS_BIT0 (1300)

Definition at line 20 of file sstvfreq.h.

Referenced by sstvenc_encoder_vis_data_freq(), and sstvenc_encoder_vis_parity_freq().

◆ SSTVENC_FREQ_VIS_BIT1

#define SSTVENC_FREQ_VIS_BIT1 (1100)

Definition at line 18 of file sstvfreq.h.

Referenced by sstvenc_encoder_vis_data_freq(), and sstvenc_encoder_vis_parity_freq().

◆ SSTVENC_FREQ_VIS_START

#define SSTVENC_FREQ_VIS_START (1900)

Definition at line 22 of file sstvfreq.h.

Referenced by sstvenc_encoder_next_vis_pulse().

◆ SSTVENC_FREQ_WHITE

#define SSTVENC_FREQ_WHITE (2300)

Definition at line 23 of file sstvfreq.h.

Referenced by sstvenc_level_freq().

Function Documentation

◆ sstvenc_level_freq()

uint16_t sstvenc_level_freq ( uint8_t level )

Compute the frequency that corresponds to the given signal level given in unsigned Q8 fixed-point.

Parameters

[in] level Signal level in Q8 fixed-point.

Returns: Output frequency in hertz.

Definition at line 13 of file sstvfreq.c.

                                           {
        double flevel = level / ((float)UINT8_MAX);
        if (flevel >= 1.0) {
                return SSTVENC_FREQ_WHITE;
        } else if (flevel <= 0.0) {
                return SSTVENC_FREQ_BLACK;
        } else {
                return (uint16_t)(SSTVENC_FREQ_BLACK
                                  + (flevel
                                     * (double)(SSTVENC_FREQ_WHITE
                                                - SSTVENC_FREQ_BLACK))
                                  + 0.5);
        }
}

References SSTVENC_FREQ_BLACK, and SSTVENC_FREQ_WHITE.

Referenced by sstvenc_encoder_next_channel_pulse().

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Macros

Functions