Modulation is the change in the amplitude and frequency of the carrier only?

Question

True or False?

Answer 1

True. Otherwise a song would sound differently depending on what radio station you have tuned in.

AM = Amplitude Modulation
FM = Frequency Modulation

Answer 2

The other answers left out phase. A carrier can be modulated by frequency, amplitude, or phase. All modulations, even the most sophisticated and newest ones (eg OFDM) use combinations of these three.
Side note: OFDM uses multiple carriers in theory, but in practice this is implemented by generating a single carrier and modulating it with many subcarriers.

Answer 3

Frequency modulation (FM) is a form of modulation that represents information as variations in the instantaneous frequency of a carrier wave. (Contrast this with amplitude modulation, in which the amplitude of the carrier is varied while its frequency remains constant.) In analog applications, the carrier frequency is varied in direct proportion to changes in the amplitude of an input signal. Digital data can be represented by shifting the carrier frequency among a set of discrete values, a technique known as frequency-shift keying.

Answer 4

AM= amplitude modulaton//the carrier freq does not change. in FM= freq mod the carrier freq stays the same. freq mod does not change amplitude, but freq in the lateral sense. each of tese have very different types of detectors for demodulation.

Answer 5

Kinda has the ring of a trick question, but I'll go with "true". It is the carrier that is altered in order to convey information, not the info itself.