A two-tone amplitude modulation system uses 400 Hz for a "one" and 550 Hz for a "zero" and a carrier frequency of 9.35 MHz. The required bandwidth for this communication channel is:
A) 400 Hz.
B) 1100 Hz
C) 550 Hz
D) 950 Hz
E) 800 Hz

Question

Quizplus · Accepted Answer

The required bandwidth for a two-tone amplitude modulation system is twice the difference between the highest frequency tone and the lowest frequency tone. Here, the difference between 550 Hz and 400 Hz is 150 Hz. Therefore, the required bandwidth is 2 * 150 Hz = 300 Hz. However, none of the provided options correctly matches this calculation, indicating a potential misunderstanding in the question's premise or a mistake in the provided options. Typically, for AM systems, the bandwidth is indeed twice the highest modulating frequency, but given the specific details and options provided, there seems to be a discrepancy.

A Two-Tone Amplitude Modulation System Uses 400 Hz for a "One