OmniTek OTR 1001 User Guide, v3.1a
K-1
K
: Audio Monitoring
Each analyser within the OTR 1001 is able to analyse up to 16 audio channels alongside the
video images it processes. This section describes the possible sources for this audio and
describes the different analyses that may be applied. It also describes how the audio may be
played back.
The facilities described here are mainly provided as standard but the AUDIO_LOUD option is
required to display True Peak data and the various Loudness data described in Section K.4.
Note:
The AUDIO_LOUD option is automatically installed for anyone who purchased the earlier
AUDIO option.
K.1 Audio Input
There are a number of possible sources for the audio analysed by the OTR 1001:
Embedded audio
AES/EBU audio
Dolby-encoded audio, delivered alongside embedded audio
In addition, the OTR 1001 is able to interpret embedded audio and AES/EBU audio either as
simple stereo pairs or as surround sound. (With Dolby-encoded audio, the way in which the
channels are interpreted is defined within the Dolby metadata.)
These options result in a range of possible ‘Audio Inputs’ for each analyser to work with:
Embedded pairs; Embedded Surround sound; AES pairs; AES surround sound and SDI Dolby.
The OTR is also able to present the results of selected stereo mix-downs.
Which of these options are offered on any system depend on which software options are
installed. The OTR’s basic audio facilities allow embedded audio delivered via either SDI port to
be interpreted either as Pairs or as Surround sound. Analysing AES/EBU audio requires the
AUDIO_AES option to be installed. Analysing Dolby audio requires the appropriate
AUDIO_DOLBY options to be installed.
The range of Audio Inputs that are available for processing by the built-in analyser/analysers is
shown on the Audio Inputs page of the Config window (described in Section T.6). This page also
allows the user to specify how the different channels of the physical audio input are used.
The OTR 1001 offers a choice of analyses that can be applied to audio data, from PPMs to
Lissajous figures showing the phase relationship between different channels. These are described
in the following sections. The Audio Status display lists data for all the audio inputs available to
be analysed alongside the selected video input. An
Audio Input
option is offered with other
displays to allow the display to be switched to the required audio source. The selected input is
named in the title of the display and is retained (along with the selected channel pair) as you
cycle through the different Audio displays.
Note:
The special features of working with AES/EBU audio are described in Section K.8, while
the special features of working with Dolby audio are described in Section L.
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