Samples Of Telephone Greetings Explain How The Analogue Speech Signal Of A Telephone Call Is Converted To A Digital Signal;?

Explain how the analogue speech signal of a telephone call is converted to a digital signal;? - samples of telephone greetings

Explain how the signal from analog voice from a phone call, a digital signal;
the most important steps in the process and thus the bit rate is required 64 kbit / s.
Suppose the code words of the digital signal of 8 bits, but must be included
his statement about the choice of sampling frequency and the size of the code word has an impact on the quality of
resulting digital signal, and why filtering is necessary in the conversion.