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Introduce offset correction rate

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We want to correct the offset quickly, but we also want to keep the
frequency error caused by the correction itself low.

Define correction rate as the area of the region bounded by the graph of
offset corrected in time. Set the rate so that the time needed to correct
an offset equal to the current sourcestats stddev will be equal to the
update interval (assuming linear adjustment). The offset and the
time needed to make the correction are inversely proportional.

This is only a suggestion and it's up to the system driver how the
adjustment will be executed.
This commit is contained in:
Miroslav Lichvar
2011-09-05 15:45:32 +02:00
parent 79e5f2be13
commit c7d0232bb1
13 changed files with 40 additions and 20 deletions
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5
localp.h
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@@ -41,8 +41,9 @@ typedef double (*lcl_ReadFrequencyDriver)(void);
typedef double (*lcl_SetFrequencyDriver)(double freq_ppm);
/* System driver to accrue an offset. A positive argument means slew
the clock forwards. */
typedef void (*lcl_AccrueOffsetDriver)(double offset);
the clock forwards. The suggested correction rate of time to correct the
offset is given in 'corr_rate'. */
typedef void (*lcl_AccrueOffsetDriver)(double offset, double corr_rate);
/* System driver to apply a step offset. A positive argument means step
the clock forwards. */