Lexicon is an American company that engineers, manufactures, and markets audio equipment as a brand of Harman International Industries.

The company was founded in 1971 with headquarters in Waltham, Massachusetts, and offices in Salt Lake City, Utah.

[1] Lexicon traces its history to the 1969 founding of American Data Sciences by MIT professor Dr. Francis F. Lee and engineer Chuck Bagnaschi, developers of digital audio devices for medical heart monitoring.

[3] The company is widely known for the design and development of the multi-speaker audio system for the Rolls-Royce Phantom, as well as the Hyundai Equus and the Kia K900.

The PCM series was introduced as a smaller, more economical option particularly in live situations where the 224XL was too cumbersome for a rack rider.

David Gilmour from Pink Floyd used a Lexicon PCM-70 to store the circular delay sounds in songs such as "Shine On You Crazy Diamond" and "Time" in 1994's The Division Bell Tour.

In 1988, Lexicon developed LARES, an electronic processing system intended to give performance spaces a tailored acoustic experience.

LARES uses microphones to pick up the sound, central processing units to apply time-variant anti-feedback, delay and reverberation algorithms, and banks of loudspeakers to bring the enhanced audio signal back into the performance space.

Lexicon continues to benefit from its initial LARES research and development with the company offering a scaled-down and simplified microprocessor controller, the MC-12,[10] intended for auditory enhancement within home and professional listening spaces.

[12] In addition to surround processors, Lexicon also sells the LX and CX multi-channel home theater amplifiers and the RT-20 DVD player.