The normalizing functionality is developed in accordance with EBU Technical Recommendation R 128. It is designed to benefit our clients with the intention of:

Performing monitoring and control over the perceived loudness of audio sources.

Reducing loudness differences between programmes. This is applicable when the nature and content of the audio material(s) changes frequently. For example, such problem most commonly occurs at the breaks for advertising: there is a jump between audio levels.

Loudness jumps between broadcast channels and between programmes within the same channel are frequent source of audience complaints. Using the normalizing functionality, the audio levels between separate programmes will be equalized. EBU Rec. R 128 is based on ITU-R BS.1770 and defines a new way of metering and normalizing audio. It also recommends some of the following standards:



The Programme Loudness Level" shall be normalized to a Target Level of -23 LUFS. The permitted deviation from the Target Level shall generally not exceed 1 LU for programmes where an exact normalization to Target Level is not achievable practically (for example, live programmes)” – EBU Rec. R 128

“The Maximum Permitted True Peak Level" of a programme during production shall be -1 dBTP (dB True Peak)” - EBU Rec. R 128

According to EBU Tech3343, there are two ways to achieve loudness normalization for the consumer:

The first one is concerning a normalization of the source itself, so that the programmes will be “equally loud by design”.

The second method is related to the use of loudness metadata that describes how loud a programme is. In such case the average programme loudness levels don’t need to be changed to a normalized value.

NOTE: X-Pert Playout does not process the audio by applying a permanent modification (compression, peak limits, EQ) of the source content. It just changes the audio during playout by adjusting audio levels.