Biomedical Transducer and Instrumentation

Which of the following is the primary purpose of amplification in biosignal acquisition?
(i) To reduce the signal-to-noise ratio
(ii) To make the weak bioelectrical signals detectable and measurable
(iii) To convert analog signals to digital signals
(iv) To filter out unwanted frequencies

Discuss the various techniques used for amplification and filtering in biosignal acquisition. Explain the importance of signal amplification in obtaining high-quality biosignals and the different types of filters used to remove unwanted noise or artifacts.