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implement new value bound for time variance measurement class

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This commit is contained in:
Volker Fischer 2009-08-15 14:16:51 +00:00
parent d6ec1b8978
commit e354d985bc
1 changed files with 639 additions and 619 deletions
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36
src/util.h
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@ -562,16 +562,22 @@ public:
class CCycleTimeVariance
{
public:
CCycleTimeVariance() : iBlockLengthAtSystemSampleRate ( 0 ) {}
CCycleTimeVariance() : iBlockLengthAtSystemSampleRate ( 0 ),
dIntervalTime ( 0.0 ), iNewValueBoundFactor ( 0 ) {}
virtual ~CCycleTimeVariance() {}
void Init ( const int iNewBlockLengthAtSystemSampleRate,
const int iNewSystemSampleRate,
const int iHistoryLengthTime )
const int iHistoryLengthTime,
const int iNewNewValueBoundFactor = 4 )
{
// store block size and sample rate
// store block size and new value bound factor
iBlockLengthAtSystemSampleRate = iNewBlockLengthAtSystemSampleRate;
iSystemSampleRate = iNewSystemSampleRate;
iNewValueBoundFactor = iNewNewValueBoundFactor;
// calculate interval time
dIntervalTime = static_cast<double> (
iBlockLengthAtSystemSampleRate ) * 1000 / iNewSystemSampleRate;
// calculate actual moving average length and initialize buffer
RespTimeMoAvBuf.Init ( iHistoryLengthTime *
@ -593,10 +599,23 @@ public:
// we want to calculate the standard deviation (we assume that the mean
// is correct at the block period time)
const double dCurAddVal = ( (double) ( CurTime - TimeLastBlock ) -
( iBlockLengthAtSystemSampleRate * 1000 / iSystemSampleRate ) );
const double dCurAddVal =
static_cast<double> ( CurTime - TimeLastBlock ) - dIntervalTime;
RespTimeMoAvBuf.Add ( dCurAddVal * dCurAddVal ); // add squared value
if ( iNewValueBoundFactor > 0 )
{
// check if new value is in range
if ( fabs ( dCurAddVal ) < ( iNewValueBoundFactor * dIntervalTime ) )
{
// add squared value
RespTimeMoAvBuf.Add ( dCurAddVal * dCurAddVal );
}
}
else
{
// new value bound is not used, add new value (add squared value)
RespTimeMoAvBuf.Add ( dCurAddVal * dCurAddVal );
}
// store old time value
TimeLastBlock = CurTime;
@ -613,7 +632,8 @@ protected:
CMovingAv<double> RespTimeMoAvBuf;
int TimeLastBlock;
int iBlockLengthAtSystemSampleRate;
int iSystemSampleRate;
double dIntervalTime;
int iNewValueBoundFactor;
};
#endif /* !defined ( UTIL_HOIH934256GEKJH98_3_43445KJIUHF1912__INCLUDED_ ) */