1 E.g. 2  Text is translated into either one of two character codes: ASCII or EBCDIC (Appendix A). 3  Then, since there are two types of signals digital and analog, there are 4 possible encoding techniques that can be used on the data: 4  Digital-to-digital, Digital-to-Analog, Analog-to-analog, Analog-to-digital. E.g. 2  Text is translated into either one of two character codes: ASCII or EBCDIC (Appendix A). 3  Then, since there are two types of signals digital and analog, there are 4 possible encoding techniques that can be used on the data: 4  Digital-to-digital, Digital-to-Analog, Analog-to-analog, Analog-to-digital.