2 User Manual
The Qualis Audio Sentinel was designed to address the compound
needs of increased audio monitoring requirements, decreased person-
nel availability and shrinking budgets. It uses advanced signal process-
ing algorithms to directly answer broadcast user’s fundamental ques-
tions, rather than merely displaying information requiring further anal-
ysis by experienced personnel. The Sentinel allows significant reduc-
tions in operating costs while improving the quality of delivered audio.
Features
The Qualis Audio Sentinel monitors a surround program, up to 8 chan-
nels. Measurements include:
■Individual surround channel signal levels with user selectable ballis-
tics
■Stereo and mono downmix signal levels with user selectable ballistics
■True peak levels of the surround and downmix channels
■Loudness to ITU-R BS.1770 (LKFS)
■Surround balance
■Downmix Compatibility, directly answering “will my program change
when reproduced in stereo or mono?"
■LFE bandwidth & phase compatibility
■Spectrum with one octave resolution
■Over-level conditions
■Dead channel detection
■Hum detection on fundamental plus 2 harmonics
For digital inputs the Sentinel extracts metadata and compares it:
