The BLITS 5.1 tone generator was designed in conjunction with Martin Black and Keith Lane at BskyB.
Martin and Keith devised the BLITS tone sequence primarily for use with their HDTV broadcasts with associated 5.1 surround sound.

The BLITS is used on all Sky Sports surround sound outside broadcasts.

Provision is made for stereo line identification, channel phase and identification of the six 5.1 audio channels, L,R,C,LFE,Ls and Rs. These channel identification frequencies correspond to notes A5,A5,E6,E2,E5,E5 respectively.
The tone generator may be switched between 5.1 and stereo oscillator sequences and individual 5.1 sequences may be 'looped'. The unit also includes a discreet EBU tone source and may be controlled by external GPIs. An AES input is provided for sync reference.
All audio outputs are mirrored by illuminated leds on the front panel. The Blits supplies both analogue and AES/EBU outputs. Digital outputs may be specified with either 75 ohm unbalanced outputs on BNCs or 110 ohm balanced outputs on XLRs. All analogue outputs are on XLRs and electronically balanced.