Unwanted loudness variations within and between broadcast channels have been a source of audience complaints for years. The EBU recently published several documents (including EBU Technical Recommendation R-128) describing a new loudness metering and normalization practice, closer to the human way of perceiving sound, that has already been found to significantly reduce the level of audience complaints.

At IBC 2010 over 20 vendors showed support for EBU loudness metering in their products. Since then, the number of broadcasters to have started their own loudness projects has rapidly increased and the need for 'hands-on' advice became apparent which is why the EBU is holding this one-day Loudness Workshop for broadcasters on 23 February. The workshop is free and EBU membership is not required to attend. 

During the workshop, engineers will share their experience of using EBU loudness metering and normalization for television and radio. Participants will receive a thorough introduction to the loudness issue, the EBU's solution and how it can be implemented. A live mixing session on stage will demonstrate what the shift to loudness levelling really means. The afternoon will be dedicated to loudness equipment. Hardware and software solutions from a wide range of vendors will be on display. Participants will be able to discuss product details with vendor representatives. Special loudness mixing sessions will also be held for mixing engineers attending the event (a limited number of seats is available for these sessions).

Test material and EBU mode compliant logo

The EBU has developed test material that can be used to check if equipment is likely to be compliant. The test set provides a way to check a number of key parameters. If a loudness meter that is intended to be 'EBU mode' compliant does not show the expected measurement results for the test set, it is likely not to be compliant. The test material is available for free and can be downloaded here.

To signal 'EBU mode' compliance, vendors may want to use the EBU R 128 logo. The EBU allows the use of this logo for compliant products and their marketing as long as a set of basic rules is followed.