Toshitada Doi (土井 利忠, Doi Toshitada, born February 2, 1943) is a Japanese electrical engineer, who played a significant role in the digital audio revolution.
He received a degree in electrical engineering from the Tokyo Institute of Technology in 1964, and a PhD from Tohoku University in 1972.
He was the driving force behind the PCM adaptor, and was a prominent member of the Sony/Philips taskforce responsible for the design of the Compact Disc.
[2] He, with Kees Immink, refutes the myth that the Compact Disc's playing time was determined by Beethoven's Ninth Symphony.
[3] He was the lead engineer of the DASH multi-track digital audio tape recorder.