| The data collects and mean that temperature, pressure, discharge and's moving to etc. amount of emulation to collect to convert into a number is again carried on by calculator after measuring saving, processing, show or print of process.Correspond of fastenning and knowing together as the data collect system.Heart electricity data's collecting system is the key part that the electrocardiogram checks an instrument.The human body heart telecommunication is very weak, solid, doing not lose really must withdraw cardiac telecommunication, is very meaningful and lay the foundation for studying the contact of various disease and the heart telecommunication.The purpose and meaning of this selected works dirty disease has become to endanger mankind one of the main disease of health.Therefore, accurately carry on the heart telecommunication to withdraw, it is an important but meaningful topic to provide effective assistance analysis means for the doctor.This text makes use of an appropriative instrument gauge enlarger AD620,89C54RD single-chip microprocessoror , high-speed A/D conversion the machine ADC0809 and many roads imitated a switch to design a kind of meet the above-mentioned request of many road heart electricity the data collect system.This text designs the heart telecommunication to collect a mold piece first and includes heart to place big electric circuit before the electricity and takes to filter an electric circuit, the 50 Hzs sinks an electric circuit, the lord enlarges electric circuit and give or get an electric shock even lift to rise electric circuit, A/D conversion electric circuit, list slice machine processing the cents such as electric circuit and place of honor machine etc. constitute.Place before passing first the big electric circuit carries on a class to enlarge to original heart telecommunication, again will first of originality enlarge the signal has been taken to filter an electric circuit with filter in addition to useful heart telecommunication repeatedly takes of interference signal, because of 50 Hz work repeatedly the signal exist strong interference to the heart telecommunication, and repeatedly take in useful heart telecommunication in, therefore have to pass work to repeatedly sink an electric circuit to filter the interference's signal to remove.Because the form picks up from the human body body of the heart telecommunication is very weak, generally only have a 0~5 mVs, but A/D conversion the electric circuit input of signal request for the 0～2.5 Vs, so the whole signal enlarges multiple to request to 500 times or so, but ex- place enlarging of enlarger multiple only have 10times or so, therefore have to through a lord enlarge electric circuit to enlarge the heart telecommunication further.Signal through after adjusting a reason, from sink an electric circuit output's heart telecommunication in order to hand over to change signal, is sending into a mold|number the conversion machine before still need to carry on to give or get an electric shock even lift to rise.List slice machine can identify number signal, but after the heart telecommunication of enlarger imitate quantity, so at send the heart telecommunication into list the slice have to also devote a mold to it before machine handle|few conversion, with creation list slice function over identify and handle of number signal.End list slice the machine connect to input the place of honor machine to carry on through a RS-232 to the heart telecommunication result after handling further of of handle and show. |
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