| 摘要 |
Controlling loudness during a junction between different types of broadcast content, such as a junction between programme and commercial or promotional content, is done by applying a time-varying gain control to the content before and/or after the junction in order to smooth its loudness value across the junction. Representative loudness values for content respectively before (P) and after (C) are received from a playout automation system. The audio gain is smoothly increased prior to the junction to a gain (P + C)/2P times higher than the original gain value. Then, the gain is reduced shortly before the junction to a value (P + C)/2C times lower than the original gain value. After the junction, the gain is returned smoothly to the original value. A playout automation system may be used for the gain control and advance notification of the time of the junction may also be used in smoothing the loudness value. Continuous measurement may also be applied. |
