What is one way that voice is transmitted in a pulse-width modulation system?
A standard pulse is varied in amplitude by an amount depending on the voice waveform at that instant.
The position of a standard pulse is varied by an amount depending on the voice waveform at that instant.
A standard pulse is varied in duration by an amount depending on the voice waveform at that instant.
The number of standard pulses per second varies depending on the voice waveform at that instant.
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