GLITS

Graham's Line Identification Tone System (GLITS) is a test signal for stereo systems devised by BBC TV Sound Supervisor and Fellow of the IPS Graham Haines in the mid-1980s.

The EBU Technical Document Multichannel Audio Line-up Tone (Tech 3304) defines stereo lineup tone as having an interruption in the left channel only, lasting 250 ms every 3 s. There is now an official EBU standard for a multichannel BLITS 5.1 channel ident tone which is also described in the Tech 3304 paper, along with an alternative film-style multichannel ident tone system for systems larger than 5.1 arrays.

The alternative EBU multichannel ident tone follows a format more closely associated with the film industry.

The ident sequence starts at Front Left and continues clockwise through each available channel.

The amount of time between the 3 second constant tone periods indicates the total number of channels in the system—e.g.