I could tell by your voice on the phone that something was wrong.

By his voice, it was one he would rather not have heard.

And you could tell by his voice that something was wrong.

The rest of the Council did agree, at least by voice.

And he could have saved me by his single voice.

He could tell by her voice that she was really worried.

He could tell by her voice that she was crying.

Does not show surprise even by his voice that we are walking here together.

"It's a step toward the free interaction with the computer by voice."

She pulled back from him, now only touching by voice.