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E8B15

What is one way that voice is transmitted in a pulse-width modulation system?

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AThe position of a standard pulse is varied by an amount depending on the voice waveform at that instant
BA standard pulse is varied in amplitude by an amount depending on the voice waveform at that instant
CThe number of standard pulses per second varies depending on the voice waveform at that instant
DA standard pulse is varied in duration by an amount depending on the voice waveform at that instant