please answer those questions for me. That is the whole homework I am stuck on. The answers need to be accurate Please

6.12 What is the definition of baud 6.13 Why is an analog signal used to approximate a digital signal? 6.14 What is the bandwidth of a digital signal? Explain 6.15 What is a synchronization error? 6.16 Why do some coding techniques use multiple signal elements to represent a single bit? 6.17 What aspect of a signal does the Manchester Encoding use to represent a bit? 6.18 What is the chief advantage of a Differential Manchester Encoding? 6.19 When converting an analog signal to digital, what step follows sampling? 6.20 If the maximum frequency audible to a human ear is 20.000 Hz, at what rate must the ana- log signal from a microphone be sampled when converting it to digital? 6.21 What time elapses between each sample for the PCM encoding used in the telephone sys tem? 6.22 Describe the difference between lossy and lossless compressions, and tell when each m be used