In which type of modulation is a 1 distinguished from a 0 by shifting the direction in which the wave begins? Telecom Chapter 3 In which type of modulation is a 1 distinguished from a 0 by shifting the direction in which the wave begins? a. bandwidth modulation b. amplitude modulation c. frequency modulation d. phase modulation e. codec modulation Answer: phase modulation Learn More : Share this Share on FacebookTweet on TwitterPlus on Google+