used primarily in the analog audio tracks of laserdiscs. This is a level sensitive audio noise reduction scheme that involves compression, on the encode side, and expansion, on the decode side. It was originally developed for CBS for noise reduction on LP records and is a Trademark of CBS Inc. The noise reduction obtained by CX was to be better than Dolby B3 for tape, but remain unnoticeable in playback if decoding didn't take place. A modified CX system was applied to the analog audio tracks of the laserdisc to compensate for interference between the audio and video carriers. The original CX system for LP records was never commercially implemented. Its implementation in laserdisc is slightly different than was being proposed for LP’s. Stand-alone CX decoders were on the market from Pioneer in the early days of laserdisc.