DSP chips are found in sound cards, synthesizers, effects units, playback and speech synthesis, fax machines, modems, cellular phones, high-capacity hard disks and digital TVs. It is possible that the first DSP was used in the Speak & Spell game in the late 1970s from Texas Instruments. Typically, digital signal processing provides reverb or delay effects, loud speaker processing, EQ limiting and compression as well as feedback destroyers. Other audio uses are amplifiers that simulate concert halls and surround-sound effects for music and home theater. See DSP and Merge.