A novel audio playback chip using digitally driven speaker architecture with 80%@-10dBFS power efficiency, 5.5W@3.3V supply and 100dB SNR. - Michitaka Yoshino; Mitsuhiro Iwaide; Daigo Kuniyoshi; Hajime Ohtani; Akira Yasuda; Jun-ichi Okamura (CICC, 2011)

A highly directional speaker with amplitude-phase control using a digitally direct-driven system. - Takemichi Ishikawa; Shuma Yokoyama; Noboru Harashima; Dai Takahashi; Jun Shiozawa; Michitaka Yoshino; Akira Yasuda (ICCE, 2014)

Digital direct-driven speaker architecture using segmented pulse shaping technique. - Go Harumi; Satoshi Saikatsu; Michitaka Yoshino; Akira Yasuda (NEWCAS, 2016)

Speaker system with 100-W high output power and 0.17% THD using 9-V power supply with digitally direct-driven technique. - Yuki Furuya; Masayoshi Takahashi; Satoshi Saikatsu; Michitaka Yoshino; Akira Yasuda (ICCE, 2017)

A delta-sigma DAC with feedforward jitter-shaper reducing jitter noise. - Shuta Masuda; Satoshi Saikatsu; Michitaka Yoshino; Akira Yasuda (MIXDES, 2017)