Modulation and Carrier Waves

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Questions and Answers

What happens when the amplitude sensitivity ka of the modulator is large enough to make |ka m(t)| >1 for any t?

  • The carrier wave disappears
  • The carrier wave becomes under-modulated
  • The carrier wave remains the same
  • The carrier wave becomes over-modulated (correct)

What is the unit of measurement for the carrier amplitude Ac and the message signal m(t)?

  • Watts
  • Amps
  • Volts (correct)
  • Hz

What is the condition for the envelope to have the same shape as the message signal m(t)?

  • The amplitude of ka m(t) is always equal to unity
  • The amplitude of ka m(t) is always greater than unity
  • The amplitude of ka m(t) is always less than unity (correct)
  • The amplitude of ka m(t) is randomly varying

What is the term for the absolute maximum value of ka m(t) multiplied by 100?

<p>Percentage modulation (B)</p> Signup and view all the answers

What is the condition for the carrier frequency in relation to the message signal bandwidth?

<p>The carrier frequency is much greater than the message bandwidth (A)</p> Signup and view all the answers

What happens when the carrier frequency is not much greater than the highest frequency component W of the message signal?

<p>An envelope cannot be visualized satisfactorily (C)</p> Signup and view all the answers

What is the purpose of amplitude modulation?

<p>To transmit information pertaining to the message signal m(t) (B)</p> Signup and view all the answers

What is the term for the amplitude of the modulated wave s(t)?

<p>Envelope (C)</p> Signup and view all the answers

What is the consequence of over-modulation?

<p>Envelope distortion (B)</p> Signup and view all the answers

What is the relationship between the amplitude of ka m(t) and unity in amplitude modulation?

<p>The amplitude of ka m(t) is always less than unity (A)</p> Signup and view all the answers

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