Select all the statements that provide a correct relationship among modulation parameters: a. The amplitude of the recovered message decreases as the message frequency is increased. b. To improve signal demodulation, we can try increasing the message amplitude. c. To improve signal demodulation, we can try increasing the carrier amplitude. d. Modulation index is preferred to be minimized. e. Modulation index is preferred to be maximized. f. Using two diodes in series will improve the rectification process. g. Using two diodes in parallel will improve the rectification process. h. In actual implementation, there are more parameters to consider in order to ensure accurate message recovery.

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Amplitude modulation

A radio signal can carry information in the form of sound or image for broadcasting or communication. For it to be sent to a greater distance, the signal must be changed or modulated in some way. One of the easiest way is to change the amplitude of the signal with variations of the video or the audio signal. This is called Amplitude Modulaton. In this modulation information of message is carried in amplitude of carrier signal.