Picture a seven-foot grand piano in a studio. The lid’s missing, so you can see all the strings. Researchers suspend a rod embedded with 32 microphones over the piano’s body.
“We played this middle C at a very soft level, a medium level, and a very loud level,” says Agnieszka Roginska, a professor in NYU’s music technology program. She says using a pianist to play middle C over and over wouldn’t be scientific. So they’re using a disklavier, a fancy player piano triggered by electronics. “So we could hit the same note, with the same velocity, thousands of times,” she says.
They’d record the piano in one spot. Then move the microphones eight inches. Record the note. Move the mics again. Record the note. Over and over and over, until they reach the back of the piano. At the end, they get “what is basically a very dense acoustical scan of the radiation pattern of the grand piano,” Roginska says.
Read the entire article here: http://www.pri.org/stories/2014-08-10/science-tries-understand-what-gives-piano-its-voice