Robot voice circuit schematic

The minimum playback circuit shown in uses the A0, PD, /CE and /EOM signals interfaced to the robot microcontroller. For playback PD is reset to ‘0’ and to play the first message a low pulse is given on /CE. With A0 at ‘0’ playback occurs at normal speed but with A0 at ‘1’ the chip enters ‘fast forward’ mode where it advances through the message at 800 times its normal playback speed. When the third message needs to follow the first for example, the processor sets A0 to ‘1’ and pulses /CE low to fast-forward through the second message, waiting for the /EOM flag to go low. Once this occurs A0 is reset to ‘0’ and a low pulse on /CE plays back the third message….

Download Robot Voice Generator.Pdf