KEVIN SPACEY HAS an uncanny talent for celebrity impersonation. And now he’s playing the oft-mimicked not-a-crook in Elvis & Nixon, in theaters April 22. But though Spacey’s dead president and Katharine Hepburn impressions sound pitch-perfect to us, we are mere humans, with fallible ears. We wanted to know if Spacey’s vocal copies sounded good to a machine. So we asked Nuance, a company that provides biometric customer authentication for banks, insurance firms, and the like, to run some clips through FreeSpeech, its program for verifying “voiceprints.” ¶ It turns out that Spacey’s impressions are better than most, but none can fool a robot. Why? About half the characteristics that FreeSpeech tests are based on physical attributes, like vocal cord length, mouth shape, and nasal passage size. In a sense, the…
