The main effort in the PQRST feature extraction is finding the exact location of the waves (Figure 5.1 shows the PQRST waves and the location points). After finding the waves’ locations, the determination of the waves amplitudes and shapes is much simpler. The strategy for finding the waves’ locations is to first recognize the QRS complex, which has the highest frequency components. T wave is recognized next, and, finally, the P wave, which is usually the smallest wave. The baseline and the ST features are relatively easily estimated later.

biosig4c++
..........\biosig.pro
..........\t220
..........\....\crc4scp.c
..........\....\sopen_scp_write.c
..........\biosig.h
..........\mexSLOAD.cpp
..........\THANKS
..........\biosig.c
..........\Makefile.win32
..........\save2gdf.c
..........\save2aecg
..........\t210
..........\....\types.h
..........\....\codes.h
..........\....\sopen_famos_read.c
..........\....\structures.h
..........\....\sopen_alpha_read.c
..........\....\LICENSE
..........\....\sopen_scp_read.c
..........\....\scp-decode.cpp
..........\biosig_client.c
..........\biosig-network.h
..........\win32
..........\.....\zlib
..........\.....\....\README.txt
..........\.....\....\DLL_FAQ.txt
..........\.....\....\lib
..........\.....\....\...\zlib.def
..........\.....\....\...\zdll.exp
..........\.....\....\...\zdll.lib
..........\.....\....\USAGE.txt
..........\.....\....\zlib1.dll
..........\.....\....\include
..........\.....\....\.......\zconf.h
..........\.....\....\.......\zlib.h
..........\.....\....\test
..........\.....\....\....\example_d.exe
..........\.....\....\....\testzlib_d.exe
..........\.....\....\....\untgz_d.exe
..........\.....\....\....\minigzip_d.exe
..........\.....\README
..........\.....\mexSLOAD.mexw32
..........\.....\getlogin_r.c
..........\.....\libbiosig.dll
..........\.....\libbiosig.lib
..........\.....\eventcodes.txt
..........\.....\rec2bin.bat
..........\.....\zlib123-dll.zip
..........\.....\libbiosig.def
..........\.....\bin2rec.bat
..........\.....\libz.a
..........\.....\save2gdf.exe
..........\README
..........\INSTALL
..........\rec2bin
..........\pdp2gdf.c
..........\eventcodes.txt
..........\biosig-network.c
..........\t230
..........\....\sopen_hl7aecg.c
..........\example.py
..........\t240
..........\....\INT-I8.c
..........\....\per_encoder.c
..........\....\REAL.c
..........\....\OCTET_STRING.c
..........\....\EnumObsValue.h
..........\....\ChoiceOfEnumTimeStamp.c
..........\....\ChannelStatus.h
..........\....\MeasurementStatus.h
..........\....\VirtualMedicalDeviceSection.c
..........\....\ber_tlv_length.h
..........\....\INT-U8.c
..........\....\MetricDescriptiveDataSection.c
..........\....\constraints.c
..........\....\ContentOrReference.c
..........\....\ManufacturerSpecificEncoded.h
..........\....\EnumVal.c
..........\....\AbsoluteRange.c
..........\....\DsaRangeSpec.c
..........\....\SystemSpecEntry.h
..........\....\INT-I32.h
..........\....\asn_SEQUENCE_OF.c
..........\....\xer_support.h
..........\....\SampleArrayDescriptiveDataSection.h
..........\....\EnumerationDescriptiveDataSection.h
..........\....\SampleArrayDescriptiveDataSection.c
..........\....\SystemModel.h
..........\....\PersonNameGroup.h
..........\....\NativeEnumerated.h
..........\....\asn_SEQUENCE_OF.h
..........\....\DynamicAttributeChangeSection.h
..........\....\OBJECT_IDENTIFIER.h
..........\....\SessionArchiveSection.c
..........\....\OID-Type.h
..........\....\EnumObsValue.c
..........\....\MsmtPrinciple.h
..........\....\AlertCondition.c
..........\....\StorageDataType.h

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