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Frage 321

What is the modulation envelope of an AM signal?

  1. The waveform created by connecting the peak values of the modulated signalRichtige Antwort
  2. The carrier frequency that contains the signal
  3. Spurious signals that envelop nearby frequencies
  4. The bandwidth of the modulated signal

Erklärung

The envelope is the outline traced by the peak amplitudes of the modulated RF, and for undistorted AM that outline reproduces the modulating waveform. It is a time-domain shape, not the carrier itself and not a bandwidth figure.

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Frage 321: What is the modulation envelope of an AM signal? · FCC General Class (Element 3) · Questena