In the college days of Dolby Laboratories.

During his college years, Dolby still worked for Ampex. As an amateur recording enthusiast, when he was in India, he began to seriously think about a way to reduce noise without damaging the sound quality. Through research, he knows that human hearing is actually "lazy". When one big sound and one small sound coexist, people's ears will "listen but not smell" the quieter sound. For example, the neighbor's dog barks outside the house, so we turn up the stereo in the house and let the dog bark out of sight; In the shower, the sound of water will also make us unable to hear the sound of mobile phones. What if things are the other way around? What would happen if the sound of the phone drowned out the sound of water? Dolby realized that if the recording sound source greatly exceeds the tape noise, the noise can be ignored. To expand this idea, if the signal intensity of the mute track is increased in the recording, the tape noise can be "disappeared" from our hearing when playing. Specifically, through the mirroring process, the circuit device designed by Dolby can restore the enhanced mute signal during recording to the normal level during playback, thus reducing the noise.

1965, he returned to England and set up his own laboratory in London to practice the scheme he thought of when he was in India. 1968 established a company named "Dolby Lab". After 1976, the main work of the company was transferred to San Francisco. 1965, the first Dolby a noise reducer came out. The system can solve the noise generated by the tape recorder when recording the master tape in the recording studio. 1966, Decca Records recorded the Mozart Piano Concerto by Nazi Askin for the first time in Vienna with Dolby noise reduction. At the end of 1966, Deka published the first record recorded with Dolby noise reduction-Mahler's Second Symphony conducted by soldiers.

What really popularized Dolby technology was Dolby B noise reduction system. It is widely used in home tape recorders and walkman products. When the research and development of Dolby B noise reduction technology came to an end, he made a decision that Dolby Laboratories only focused on technology and did not set foot in production. By licensing Dolby's technology to manufacturers, other professional manufacturers apply it to production. Dolby and his lab have established their own business model through patents and technology authorization. This was quite avant-garde 30 years ago and set a precedent for many companies to follow suit.