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EN-87 8 | Instruments (Display Modes) | 8.15 | The BLITS Instrument
EN
SurroundMonitor 11900 Series
8.15 | The BLITS Instrument
The
BLITS
instrument is always displayed in window 3. To set
the focus on this instrument (indicated by a highlighted frame
around the window), simply press the
inSTR key. With the
focus on window 3, the BLITS functions are displayed in the
Toolbar (window 1).
The BLITS instrument provides a standardised form of chan-
nel identification and alignment for surround sound material to
prevent unintentional channel swapping.
Selecting the instrument with its button in the Toolbar automa-
tically starts the BLITS analyzer. It detects the BLITS informati-
on carried with an incoming signal. The running test sequence
is displayed in the lower frame of the instrument. When fini-
shed, the result is copied to the upper frame and dipslayed for
analyzing the channel alignment. A new test sequence mean-
while is started in the lower frame. The detection is stopped by
selecting another instrument (select
MODE
in the Toolbar).
The
BLITS
instrument also provides the option to generate
a BLITS signal cluster which can be routed to the digital and
analog outputs. If the BLITS sequence is broadcasted, you can
prepend a simple wave file including your broadcast station
identification sound. This wave file (maximum 500 KB) must
have the format 8 bit mono. It can be transferred from your PC
into the SurroundMonitor units using the integrated network
interface.
Alarm displays for the correspon-
ding columns:
green: o. k.
red:
needs attention
Columns for the incoming channels,
designated signal, level and diffe-
rence, phase and polarity
Previous test tone sequence of an
incoming signal for analyzing,
errors are marke red
Current time and test duration
Current checked channels
Current running test tone sequence
of incoming signals
8.15.1 | Background – The BLITs 5.1 surround Identification
The second sequence with also a level of –18 dBFS is only
present on the L and R channels and provides a continuous 1
kHz tone on the right channel and a four times interrupted 1
kHz tone on the left channel. The duration of this sequence is
of about 5.3 s. It is intended to provide an ident that looks nor-
mal when checking a stereo downmix of the surround signal.
The third sequence finally checks the phase of the chan-
nels and takes about 3.3 s. Here a 2 kHz tone is used for all
channels at a level of –24 dBFS. When the surround signal is
downmixed to stereo using default downmix values, then tones
with a level of about –18 dBFS on each channel should be
generated.
The channel idents follow the channel order configured for the
peakmeter bargraphs to identify any missing or mis-assigned
channel much easier.
The BLITS 5.1 surround identification tones have been deve-
loped by the Sky Television Sound Supervisiors Martin Black
and Keith Lane in 2005/2006 to provide a broadcast-specific
standardised form of channel identification and alignment for
broadcasted surround material. BLITS stands for Black and
Lane’s Ident Tones for Surround and is already used throug-
hout the Sky organisation and by many independent OB com-
panies.
The BLITS signal cluster consists of three sequences:
The first one with short single tones at a level of –18 dBFS
and a duration of about 5 s is for the identification of each
channel using different frequencies (L/R: 880 Hz, C: 1320 Hz,
LF: 83.5 Hz, LS/RS: 660 Hz).