CIRCUIT FOR GENERATING ACOUSTIC SIGNALS WITH AMPLITUDE CONTROL

摘要

For amplitude-controlled generation of an audible signal from stored digital signals, a digital-analog conversion is carried out through changeover of the base current of a bipolar transistor which is controlled with the digital signals, said transistor being connected in series with a loudspeaker. The circuit is also suitable for generating a swell and fade effect and can function with operating voltages of around 1 V due to the current-controlled analog-digital conversion. Particularly advantageous use in integrated systems is therefore possible.