question 1 what is sampling how frequent should it be what is nyquist criterion for sampling sig

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What is sampling? How frequently should it be? What is the Nyquist Criterion for sampling signals? What happens if we sample at a lower rate or a higher rate than the Nyquist rate? What will be the right sampling rate for an Audio Signal? Why do we choose the sampling rate close to the Nyquist rate and not a very high rate? What is quantization? What is the difference between linear and nonlinear quantization? How is an audio signal quantized? How do we reconstruct the original signal back from the digitized signal? What is a low-pass filter? What is Analog to Digital Conversion (ADC)? What are commercially available ADCs? What should be a good criterion for the selection of an ADC?

          What is sampling? How frequently should it be? 
What is the Nyquist Criterion for sampling signals? What happens if we sample at a lower rate or a higher rate than the Nyquist rate?
What will be the right sampling rate for an Audio Signal? Why do we choose the sampling rate close to the Nyquist rate and not a very high rate?
What is quantization? What is the difference between linear and nonlinear quantization? How is an audio signal quantized? 
How do we reconstruct the original signal back from the digitized signal? What is a low-pass filter?
What is Analog to Digital Conversion (ADC)? What are commercially available ADCs? What should be a good criterion for the selection of an ADC?

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