Hiroshi Yoshida is a Japanese synthesizer engineer whose career spans two of the country's most important instrument manufacturers — Roland and Korg — placing him at the center of the digital synthesis revolution of the 1980s.

At Roland, Yoshida contributed to the D-50, the landmark LA (Linear Arithmetic) synthesis workstation that dominated pop and film scores with its combination of sampled transients and synthesized sustain. The D-50's preset patches and integrated digital effects made complex sounds accessible to working musicians.

At Korg, Yoshida worked on the DW-8000 and DS-8, instruments that brought digital wavetable and FM-related technologies into affordable keyboards. His cross-company experience reflects the intense innovation competition among Japanese manufacturers during the transition from analog to digital dominance.

Notable products: Roland D-50, Korg DW-8000, Korg DS-8.