1. An apparatus for converting a sequence of digital words representative of speech in a time division multiplexed format into an acoustic signal, each word having a plurality of magnitude bit locations comprising: a. means for converting the magnitude bits into a plurality of voltages, each of which represents the occurrence of a bit in one of the magnitude bit locations, b. a beam made of a piezoelectric material and having a free and fixed end, c. means for applying each of the plurality of voltages across each of a plurality of elements of the beam to create a deflection of the free end of the beam related to the magnitude of the digital word, the deflection being in a direction substantially perpendicular to the length of the beam, and d. means responsive to the deflection of the free end for generating an acoustic signal related to the sequence of digital words.
3. The apparatus according to claim 1, wherein the voltage representative of the most significant bit is applied across the element of the beam closest to the fixed end and the voltage representative of the least significant bit is applied across the element of the beam closest to the free end, the beam elements having substantially equal surface areas.