Abstract
Speech and other audio output is produced from a digitally driven speaker which is turned on and off by a digital control signal derived from a digitally sampled audio input. Digitally encoded samples of an audio signal are converted to a sequence of bits, 1's and 0's, to control the application of a fixed frequency ultrasonic drive signal to a personal computer speaker. Prior to the signal conversion, the digital samples are compensated utilizing error propagation techniques for audio errors introduced by the conversion from audio levels to full on or full off speaker control bits.
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