A noise reduction scheme developed by dbx. Many people refer to any and all dbx noise reduction processes simply as dbx. Type 1, however, is the specific name for the type of dbx found in the higher end recording systems and stand alone encoder/decoder systems. It is designed specifically for high bandwidth media such as modern multitrack recordings. Although simple in theory, the classic 2:1:2 compander noise reduction used in the Type 1 could not be practically achieved before the development by dbx of two patented circuits, the dbx RMS detector and dbx Voltage Controlled Amplifier (VCA). The RMS detector enables optimum decode tracking and transient response despite the phase shifts typically induced by tape recorders. The dbx VCA provides precise gain control over an extremely wide dynamic range while maintaining very low noise and distortion.