What is the modulation index of an AM signal if the peak voltage goes from Emax to Emin?(a) \(\frac{E_{min}}{E_{max}}\)(b) \(\frac{E_{max}}{E_{min}}\)(c) \(\frac{E_{max} – E_{min}}{E_{max} + E_{min}}\)(d) \(\frac{E_{max} + E_{min}}{E_{max} – E_{min}}\)This question was addressed to me during a job interview.My query is from Spectrum of AM SC Waves in section Side Band Techniques of Analog Communications

What is the modulation index of an AM signal if the peak voltage goes

1.	What is the modulation index of an AM signal if the peak voltage goes from Emax to Emin?(a) \(\frac{E_{min}}{E_{max}}\)(b) \(\frac{E_{max}}{E_{min}}\)(c) \(\frac{E_{max} – E_{min}}{E_{max} + E_{min}}\)(d) \(\frac{E_{max} + E_{min}}{E_{max} – E_{min}}\)This question was addressed to me during a job interview.My query is from Spectrum of AM SC Waves in section Side Band Techniques of Analog Communications
Answer» Correct answer is (c) \(\FRAC{E_{max} – E_{min}}{E_{max} + E_{min}}\) Best explanation: Modulation INDEX TELLS us the amount by which the CARRIER wave is varied with respect to the message signal. It is defined as \(\frac{E_{max} – E_{min}}{E_{max} + E_{min}}\) where Emax and Emin are respectively the maximum and minimum voltage of the modulated wave.

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What is the modulation index of an AM signal if the peak voltage goes from Emax to Emin?(a) \(\frac{E_{min}}{E_{max}}\)(b) \(\frac{E_{max}}{E_{min}}\)(c) \(\frac{E_{max} – E_{min}}{E_{max} + E_{min}}\)(d) \(\frac{E_{max} + E_{min}}{E_{max} – E_{min}}\)This question was addressed to me during a job interview.My query is from Spectrum of AM SC Waves in section Side Band Techniques of Analog Communications
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