Method for registration of the foetus electrocardiogram by indirect and direct method and the device for registration of the foetus electrocardiogram by indirect and direct method
the subject of the invention is the way elektrokardiogramu foetal registration method and device for direct and indirect registration elektrokardiogramu foetus by direct and indirect.a registration elektrokardiogramu foetal direct and indirect method is characterized by the fact that in part analog is five amplifiers (1) preliminary fixed ratio reinforcement, preferably equal to 20 v \/ v, system of active mass and measuring system and control the impedance of the transition (2) between the measuring electrodes and the skin of a patientthe signals are then pre reinforced block filtration, where low limit frequency filter (3) is respectively prze\u0142\u0105czana by key analogue, favourably between value 0,05 hz and 1 hz, and the frequency limit in filter lnoprzepustowym (5) is constant and is preferably 150 hz, which for the sampling frequency signalspreferably equal to 1 khz fully protects the recorder before aliasing phenomenon, then block the amplifiers a strengthening strengthens recorded signals from level of tens of microvolts to several volts.the automatic gain adjustment and respectively selected frequency low limit filter (3) prevents the entry of amplifiers in saturation state in the case of too large distortion wolnozmiennych or relatively large amplitude recorded signals, then each signal via multipleksera analogue (6) is part of the digital recorder.which contains a microcontroller (7), 16 bit converter a \/ c (8) and a dedicated voltage stabilizer (4).the mikrokontrolera (7) is to control the work device and transmission signals to an external computer for analysis elektrokardiogramu fetal qrs detection for teams and designate the frequency of fetal heart with communication through the serial port rs 232 and the fiber, which is beneficial.the control keys are only in part analog digital, with the keys from the additional voltage stabilizer (9) in part analog and for the same reason, the reference voltage of the analogue to digital converter is also cha
