Data Encoding: A technique that requires the polar change in
the line level after each bit. To gain the control circuitry that ensures
consistent level discrimination, a level is used. The encoding is involved in
inverting the polarity of alternating bits, filtering al odd harmonics,
transmitting and receiving the waveform, and decoding the demodulated wave
form. This is done by comparing absolute value of the halt-cycle peak-to-peak
voltage gain to a predetermined table.
Modulation: Character varying process of a periodic wave with
external signals is known as modulation. Information bearing signal over
distances is sent by modulation.
Encoding is the way in which the data is represented and modulation is to alter
the characteristic of a message signal.