1. A pitch interval of 2 to 1. 2. The tone whose frequency is twice that of the given tone.
"Wanted to sincerely thank the team for the work they performed. Our family had long given up hope that any useful audio was left on the recordings of my parents wedding back in 1955. I was very happy that the 78RPM records I sent to you were digitized quickly and returned to me so that I could create a home movie with the old wedding ..."