What current was required to transmit the complex waveforms of human speech?

Answer

Continuous undulating currents

Unlike the traditional make-and-break signals used in Morse code telegraphy, the transmission of human speech required a mechanism that could replicate the continuous nature of vocal vibrations. Bell identified that creating continuous, undulating electrical currents was the necessary solution to capture and transmit the complex waveforms of the human voice.

What current was required to transmit the complex waveforms of human speech?
inventionAlexander Graham BellinventorMotivation