We can determine whether the normal muscle function by observing the electromyography(EMG),and it is very important for us to cure the spastic diseases using A-type toxin.Because EMG is within biological electricity,its signal is weak and prone to interference.We designed a processing circuit,which used two separate amplification and filtering to extract the EMG.The characteristics of the signal processing circuit showed the proposed circuit could effectively extract the EMG form 10Hz to 500Hz,and restrain the frequency interference.Therefore the circuit would achieve in future practice.
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