[Yamaha]

Outline
YMU759 is a synthesis LSI for portable telephone that is capable of playing high quality music by utilizing FMsynthesizer and ADPCM decorder that are included in this device. As a synthesis, YMU759 is equipped with Yamaha’s original FM synthesizer, with which the device is capable of simultaneously generating up to 16 voices with different tones. Since the device is capable of generating ADPCM data simultaneously synchronous with the play of the FM synthesizer, various sampled voices can be used as sound effects. Since the play data of YMU759 are interpreted at anytime through FIFO, the length of the data (playing period) is not limited, so the device can flexibly support applications such as incoming call melody distribution service. The hardware sequencer built in this device allows playing of complex music without giving excessive load to the CPU of the portable telephones. Moreover, the registers of the FM synthesizer can be operated directly for real time sound generation, allowing, for example, utilization of various sound effects when using the game software installed in the portable telephone.