Each customer could choose between a man's voice and a woman's on the announcements.

The available software can't tell the difference between voices, and even when applied to a single voice, it's only about 80 percent accurate.

Up front, the exchange between dispassionate voices and ground control continued.

"The similarity between my voice and his is due chiefly to your imagination."

She knew that the announcer was too primitive to discern the difference between voices.

The match between my natural literary "voice" and what she was looking for was extraordinary.

Each section is divided between upper and lower voices supported by a music support team drawn from the ranks.

But a consistent connection between his heart and his voice eluded him.

The story alternates between voices, but also between pictures and words.

The theme is then stated again, this time in stretto between upper and lower voices.