Monitoring of electric-cardio signals is the most direct method of discovering heart diseases. This article presents an
electric-cardio signal acquisition and processing system based on DSP. According to the features of electric-cardio
signals, the proposed system uses the AgCl electrode as electric-cardio signals sensor, and acquires analog signals with
AD620 as the prepositional amplifier, and the digital system equipped is with TMS320LF2407A DSP. The design of
digital filter and the analysis of heart rate variation are realized by programming in the DSP. Finally the ECG is obtained
with P and T waves along with obvious QRS multi-wave characteristics. The system has low power dissipation, low cost
and high precision, which meets the requirements for medical instruments.