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Use a lookup table for SNR calculation.

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Oliver Jowett 2014-09-22 14:53:06 +01:00
parent 2e45a59986
commit 76c958b03e
4 changed files with 30 additions and 12 deletions
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dump1090.h
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@ -88,7 +88,7 @@
#define MODES_ASYNC_BUF_SAMPLES (MODES_ASYNC_BUF_SIZE / 2) // Each sample is 2 bytes
#define MODES_AUTO_GAIN -100 // Use automatic gain
#define MODES_MAX_GAIN 999999 // Use max available gain
#define MODES_MSG_SQUELCH_FACTOR 16 // Min SNR expressed as an amplitude ratio, scaled by 10. 20log(16/10) = 4.1dB
#define MODES_MSG_SQUELCH_DB 4.0 // Minimum SNR, in dB
#define MODES_MSG_ENCODER_ERRS 3 // Maximum number of encoding errors
// When changing, change also fixBitErrors() and modesInitErrorTable() !!
@ -257,6 +257,7 @@ struct { // Internal state
int fd; // --ifile option file descriptor
uint32_t *icao_cache; // Recently seen ICAO addresses cache
uint16_t *maglut; // I/Q -> Magnitude lookup table
uint16_t *log10lut; // Magnitude -> log10 lookup table
int exit; // Exit from the main loop when true
// RTLSDR