Robert B. Ingebretsen (30 March 1948 – 2 March 2003) was a pioneer in the development of digital sound.

As a teenager in the 1960s, Ingebretsen built robots and primitive computers that could talk.

As a University of Utah graduate student in the early 1970s, Ingebretsen assisted Dr. Thomas G. Stockham in the development of Stockham's restoration technique for sound and images.^[1] This work led to RCA's Caruso-A Legendary Performer that applied Stockham's restoration techniques to acoustic recordings of opera great Enrico Caruso.

Ingebretsen worked with Pixar co-founder Ed Catmull in 1972 to produce one of the first digital films, a 20-second portrait of a human hand.^[2]

After graduation in 1975, Ingebretsen joined Stockham at Soundstream Inc., a Utah company where Ingebretsen wrote the software for the first practical digital audio editing system. Soundstream briefly operated an editing studio at a Paramount Pictures studio lot in Los Angeles. Ingebretsen commuted from Utah to Los Angeles, where he supervised the new digital recording for the 1982 re-release of Disney’s Fantasia.

Soundstream dissolved in 1985 and Ingebretsen spent the next 15 years in near anonymity in Salt Lake City, founding a series of small high-tech companies. In 1999 Stockham and Ingebretsen received a Scientific and Engineering Award from the Academy of Motion Picture Arts and Sciences for their pioneering work in digital audio editing.^[3]

Ingebretsen also helped pioneer satellite communications technology. In recent years, he worked for a Centerville-based startup that develops software for hand-held computers.

On 2 March 2003 Ingebretsen died of heart failure at the age of 54 at his Salt Lake City home.

• Soundstream
• Thomas Stockham