Data encoding and modulation. How do they differ from one another? - Networking

What are data encoding and modulation? How do they differ from one another?

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.

Differences: Encoding is the way in which the data is represented and modulation is to alter the characteristic of a message signal.
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