WM8978是一个低功耗、高质量的立体声多媒体数字信号编译码器。它主要应用于便携式应用，比如数码照相机、可携式数码摄像机。
它结合了立体声差分麦克风的前置放大与扬声器、耳机和差分、立体声线输出的驱动，减少了应用时必需的外部组件，比如不需要单独的麦克风或者耳机的放大器。(WM8978 is a low power, high quality stereo multimedia digital signal encoder and decoder. It is mainly used in portable applications, such as digital cameras and portable digital cameras.

It combines the preamplifier of stereo differential microphone with speaker, headphone, differential and stereo output, and reduces the necessary external components, such as no need of separate microphone or earphone amplifier.)