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C-Netz: Improve clock speed measurements.

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Sound card's clock measurements only requires a few minutes to get sub-ppm
accuracy results.
This commit is contained in:
Andreas Eversberg
2017-02-01 17:57:09 +01:00
parent 54ed5d5f82
commit 5f1d7bc970
4 changed files with 30 additions and 43 deletions
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9
src/cnetz/cnetz.h
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@@ -50,12 +50,11 @@ struct clock_speed {
double meas_ti; /* time stamp for measurement interval */
double start_ti[4]; /* time stamp for start of counting */
double last_ti[4]; /* time stamp of last received time */
uint64_t spl_count[4]; /* sample counter for sound card */
double spl_count[4]; /* sample counter for sound card */
/* making average of measurement values */
double speed_ppm_rx[2][256]; /* history of clock speed measurements */
double speed_ppm_tx[2][256];
int idx; /* index of current value */
int num; /* total num of values so far */
double speed_ppm[4][256]; /* history of clock speed measurements */
int idx[4]; /* index of current value */
int num[4]; /* total num of values so far */
};
/* instance of cnetz sender */