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Use rolling average when computing TV from flow graph

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Also, start with a guessed-at reasonable value to try to
minimized spike artifacts resulting from poor calculation
of initial breath volume.
This commit is contained in:
Guy Scharf 2021-07-17 16:22:40 -07:00
parent 0e3f669210
commit 04d7945241
1 changed files with 8 additions and 2 deletions
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10
oscar/SleepLib/calcs.cpp
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@ -480,7 +480,7 @@ void FlowParser::calc(bool calcResp, bool calcTv, bool calcTi, bool calcTe, bool
quint32 *tv_tptr = nullptr;
EventStoreType *tv_dptr = nullptr;
int tv_count = 0;
double tvlast, tvlast2, tvlast3;
double tvlast = 0, tvlast2 = 0, tvlast3 = 0;
if (calcTv) {
TV = m_session->AddEventList(CPAP_TidalVolume, EVL_Event);
@ -600,8 +600,14 @@ void FlowParser::calc(bool calcResp, bool calcTv, bool calcTi, bool calcTe, bool
//val2=x;
// Average TV over last three data points
if (tv_count == 0)
if (tv_count == 0) {
if (tv > 800) // Very much a Q&D patch to handle the first TV value not being calculated well
tv = 300; // If unreasonable, just set to a "reasonable" number.
tvlast = tvlast2 = tvlast3 = tv;
}
if (tv_count < 4) {
qDebug() << "tv" << tv << tvlast << tvlast2 << tvlast3 << "avg" << (tvlast + tvlast2 + tvlast3 + tv*2)/5;
}
tv = (tvlast + tvlast2 + tvlast3 + tv*2)/5;
tvlast3 = tvlast2;
tvlast2 = tvlast;