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David Krejci, the ninth-leading scorer in Boston Bruins history, retired Monday after 16 NHL seasons, all with the Bruins.

Operator might initially hear. >> just as when you're listening to a radio station that's out of your range. >> reporter: he said because the pings come at regular intervals and known frequency, once have it, the experienced audio technician can clean it up to hear this. we asked ginsburg to show how it's done. >> a tone with an annoying tone playing. >> reporter: when he hears it back this is what he works with. >> in this case i will attempt to get rid of the tone. >> reporter: analyzes the tone and using his own software is able to zero in on it and remove the excess noise. >> in this case ...