In which type of modulation is a 1 distinguished from a 0 by shifting the direction in whichthe wave begins?

a. bandwidth modulation

b. amplitude modulation

c. frequency modulation

d. phase modulation

e. codec modulation

E. Codec modulation

Explanation:

Codec is used to encode digital signals for transmission.

Amplitude modulation uses the amplitude of the carrier wave to encode or modulate the information for transmission.

The phase of a wave changes with respect to the amplitude, so information is modulated with the phase angle as amplitude changes in phase modulation.

Bandwidth modulation is a form of modulation that encode the information of a fixed bit size based on the frequency of the carrier wave. It is similar to frequency modulation, but frequency modulation modulate a signal wave information.