The LAME encoder vastly outperforms early encoders like L3enc. Both encoders and decoders employ these graphs extensively. LiVES uses a system of plugins for effects, decoders, encoders and video playback. Trellises are used in encoders and decoders for communication theory and encryption. MPEG-2 encoders and decoders are subject to $0.35 per unit. Sansui's QS Encoders and QS Vario-Matrix Decoders had a similar capability. Some Rotary Torque Sensors are equipped with built-in encoders. RS-422 line receivers are commonly used to receive signals from encoders that have differential outputs. Optical incremental rotary encoders are a form of choppers. For encoding audio, FFmpeg and FAAC encoders are banned. Magnetic linear encoders are used in yet other digital calipers. Modern servomotors use rotary encoders, either absolute or incremental. They used rotary shaft encoders to measure distance along disposable cotton reels. RealMedia uses compression similar to MPEG-4 Part 10 encoders such as x264. PSNR is also used often during video codec development in order to optimize encoders.