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RTW - The Loudness family

RTW Loudness Family

A reliable and standardised method for evaluating program loudness is essential e. g. for preventing abrupt volume-level changes in radio and TV broadcasts. The evaluation of frequency, measuring of individual channels with short integration time period (production), signal summation with average integration time period (production and broadcast) and long-term measuring (broadcast and monitoring) are a few of the requirements for loudness monitoring.

Easy-to-use solutions

With the Loudness Family RTW offers easy-to-use solutions for the different requirements of monitoring the loudness of stereo and 5.1 surround signals throughout the production process. The SurroundControl 31900, SurroundControl 31960, SurroundMonitor 11900, SurroundMonitor 10600, SurroundMonitor 10660-VID and DigitalMonitor 10500X-PLUS as members of the Loudness Family now include each an integrated loudness display conforming to the ITU BS.1771 guideline as a standard feature as a complement or an alternative to conventional peakmeters.

The Loudness Display

The integrated loudness measurement display can be selected as an alternative to the usual peak program meter display, as well as presets enabling the user to switch between the two modes at any time. Selection of the loudness mode activates a scale for loudness display calibrated in dB LU (loudness units) from –21 to +9 or LKFS from –31 to 0 with selectable parameters such as reference value, integration time settings for different loudness readings, and different threshold settings. The integrating loudness display, featuring a dynamic time window, is not affected by periods of silence because signals below a user-adjustable threshold are ignored.


New Features:

• Loudness display according to ITU BS.1771 with versatile adjustable parameters • Loudness bargraphs for each channel of digital Stereo and 5.1 surround signals • Scales: –21 to +9 dB LU or –31 to 0 LKFS • Easy change between Loudness display and PPM via programmed presets • Additional peak program meter bargraphs selectable • “M” bargraph for the momentary summed loudness of all connected channels for a preset period • “I” bargraph for integrated display of the mean momentary value for a dynamic time period • “L” bargraph for the loudness value of a longterm reading • Chart recorder documents the “M” and “I” readings for a dynamic time period • Surround Sound Analyzer can be used with the Loudness Meter • extended BLITS Generator and Analyzer, in addition to the 5.1-channel surround identification advanced information about any channel swapping, delays and phase or polarity changes are given to the user