signal concepts

Hi

 i am new to the field of signals processing. could someone explain what and why we do the following procedures once I have my recorded signals.

1.Remove DC from the signals 2. Normalize the signals regarding sound intensity 3. Window signals regarding their periods

I have tried online but could not find info that could explain me properly in a way that i can understand. So could someone help me understand the above concepts clearly.

Thanks in advance

Answer 1

[Walter Roberson]

There are times when the three things you list would be important, and there are times when any or all of those three things might destroy important information and be very much the wrong thing to do. It is not practical for anyone to detail all of the circumstances under which one might want to undertake or refrain from undertaking any of those three operations.

If, though, you were to describe a particular context -- signal characteristics and desired output -- then we might be able to explain the use of those techniques in that context.

[Padma]

i have two signals recorded from two mics simultaneously. i need to measure the time delay between them accurately.