sjg
27de75cf79
Add coherent FT2 sync and likelihood extraction. Align FT2 frequency and DT reporting with the reference decoder. Fix vendored monitor phase-mode type mismatches. Co-authored-by: OpenAI Codex <codex@openai.com> Signed-off-by: Stanislaw Grams <stanislawgrams@gmail.com>
63 lines
2.2 KiB
C
63 lines
2.2 KiB
C
#ifndef _INCLUDE_MONITOR_H_
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#define _INCLUDE_MONITOR_H_
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#ifdef __cplusplus
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extern "C"
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{
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#endif
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#include <ft8/decode.h>
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#include <fft/kiss_fftr.h>
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/// Configuration options for FT4/FT8 monitor
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typedef struct
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{
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float f_min; ///< Lower frequency bound for analysis
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float f_max; ///< Upper frequency bound for analysis
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int sample_rate; ///< Sample rate in Hertz
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int time_osr; ///< Number of time subdivisions
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int freq_osr; ///< Number of frequency subdivisions
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ftx_protocol_t protocol; ///< Protocol: FT4 or FT8
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} monitor_config_t;
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/// FT4/FT8 monitor object that manages DSP processing of incoming audio data
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/// and prepares a waterfall object
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typedef struct
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{
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float symbol_period; ///< FT4/FT8 symbol period in seconds
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int min_bin; ///< First FFT bin in the frequency range (begin)
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int max_bin; ///< First FFT bin outside the frequency range (end)
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int block_size; ///< Number of samples per symbol (block)
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int subblock_size; ///< Analysis shift size (number of samples)
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int nfft; ///< FFT size
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float fft_norm; ///< FFT normalization factor
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float* window; ///< Window function for STFT analysis (nfft samples)
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float* last_frame; ///< Current STFT analysis frame (nfft samples)
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ftx_waterfall_t wf; ///< Waterfall object
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float max_mag; ///< Maximum detected magnitude (debug stats)
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// KISS FFT housekeeping variables
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void* fft_work; ///< Work area required by Kiss FFT
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kiss_fftr_cfg fft_cfg; ///< Kiss FFT housekeeping object
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#ifdef WATERFALL_USE_PHASE
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int nifft; ///< iFFT size
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void* ifft_work; ///< Work area required by inverse Kiss FFT
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kiss_fft_cfg ifft_cfg; ///< Inverse Kiss FFT housekeeping object
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#endif
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} monitor_t;
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void monitor_init(monitor_t* me, const monitor_config_t* cfg);
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void monitor_reset(monitor_t* me);
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void monitor_process(monitor_t* me, const float* frame);
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void monitor_free(monitor_t* me);
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#ifdef WATERFALL_USE_PHASE
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void monitor_resynth(const monitor_t* me, const ftx_candidate_t* candidate, float* signal);
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#endif
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#ifdef __cplusplus
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}
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#endif
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#endif // _INCLUDE_MONITOR_H_
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