1.   Infants are most responsive to other human voices.

2.   One concerns the tonality of the human voice.

3.   Suddenly I wanted to hear the sound of human voices and to feel the warmth and comfort of loved ones.

4.   We heard a human voice, screaming in pain.

5.   They are working on computer-generated speech that replicates the human voice.

6.   The cloth inside muffled the noise, but when he got close to the window he could make out a human voice.

7.   There was some clicking, and then the muffled sound of a human voice making its usual incomprehensible noises.

8.   Then she heard the distinctive sounds of a loquacious Siamese cat, and a human voice raised in exasperation.

9.   Instead of being answered instantly by a human voice, callers at busy times may just hear a recorded message.