Actions Semiconductor Co., Ltd. is a system-on-a-chip company based in Guangdong, China. Actions develops system-on-a-chip (SoC) designs for digital audio players and photo viewers.
S1 MP3 players use chipsets designed by Actions.
At one point in time, Actions was sued by Sigmatel with Sigmatel prevailing. Finding were that Actions infringed upon Sigmatel by directly coping the ASICs designed by Sigmatel. Once a world leader in the MP3 ASIC market. Sigmatel later was sold to Freescale Semiconductor due to losing market share.