Question

The frequency which is not transmitted in am transmission

Answer 1

Answer:Hi, This is your answer

In amplitude modulation the carrier wave amplitude is varied is varied linearly with the modulating wave (the base band signal) creating what is called the envelope signal. The envelope has the same shape as the base band signal provided that:

1. The carrier frequency fc must be much greater then the highest frequency components fm of the message signal m (t) i.e. fc >> fm

2. The modulation index must be less than unity. if the modulation index is greater than unity, the carrier wave becomes over modulated.

Once we don't have the envelope, or the envelope doesn't resemble the original baseband signal, the detection of the AM signal to restore the modulating wave m(t) can't be done with a simple envelope detector (a diode followed by a low pass filter- RC circuit). Detection may be done, however, using other AM types of the suppressed carrier types.

Hope you like my answer

Explanation:

Answer 2

Answer:

The frequency which is not transmitted in am transmission is the audio frequency.

Explanation:

• Amplitude modulation is the process in which the amplitude of the carrier signal changes in accordance with the instantaneous amplitude of modulating wave. In this process, an amplitude proportional to the amplitude of modulating signals gets added to the message signal.
• The amplitude of the message signal varies with the frequency of the modulating signal and the frequency of the modulated signal is equal to the frequency of the carrier signal.
• The frequency spectrum shows that upper side frequency, lower side frequency and carrier frequency are transmitted in am transmission not the audio frequency.

Hence the audio frequency is not transmitted in am transmission.

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