The dialog normalization value is a Dolby Digital parameter that describes the long-term average dialog level of the associated program. It may also describe the long-term average level of programs that do not contain dialog, such as music. This level is specified on an absolute scale ranging from –1 dBFS to –31 dBFS. Dolby Digital decoders attenuate programs based on the dialog normalization value in order to achieve uniform playback level.