Platinum™ IP3
Installation and Operation Manual
Frame Synchronizer and Demultiplexing Input Modules (PT-FSDMX-IBG/PT-FSDMXO-IBG, PT-FSDX8C1D-IBG, PT-FSDMX8O1D-IBG)
© 2016 Imagine Communications Corp.
Proprietary and Confidential.
September 2016 | Page 148
Note: If an Audio channel conveys non-PCM data, such as Dolby-E/D, and a test tone for such channel
gets enabled, the non-PCM data will be replaced with PCM data (the 'tone'). 'Mute' also works on non-
PCM data, but all other Audio processing operations (Polarity Reversal, Level Adjust, Sum, Swap/Copy)
will have no effect on non-PCM data.
Sample Rate Conversion
Non-PCM Audio data (such as Dolby-E/D) cannot be sample rate converted, and is transferred from
the input clock domain to the output clock domain by dropping or repeating a full frame of non-PCM
data, every time the Video Frame Synchronizer reaches its roll-over point.
The downstream clock for the SRCs will be locked to the applied Video reference.
The clock transfer of non-PCM data by dropping or repeating a frame worth of data works if (1)
Framesync option is installed (2) The SDI channel(s) with embedded non-PCM data qualify for
Framesync mode (frame-rate of the ingested signal(s) match the frame-rate of the Reference signal)
(3) ADS Clean is set to ‘No’.
Quiet Audio Transitions
Quiet audio transitions are “popless” transitions when two sources of the same data and frame rate
are switched upstream in the serial domain (e.g. by an upstream router).
These transitions work independent of whether the two sources are synchronous or asynchronous
to each other or with respect to the reference signal, and it works regardless of the switching point.
There are no user controllable parameters for adjusting the timing of the transition.
The transition is triggered when the video_present flag gets temporarily de-asserted because of a
discontinuity in the incoming SDI stream, caused by the asynchronous switch in the serial domain.
When this happens, the Audio De-embedder has still 32 good audio samples in its output buffer,
amounting to roughly 666us worth of audio data at a 48kHz sample rate. Those samples are being
used for a fast, yet clean fade-out of the audio data, originating from the old source.
PT-FSDMX-IBG Licensing
PT-FSDMX-IBG without Frame Sync Option
Without Framesync, the module behaves like an advanced version of the PT-DEMUX, with the following
differences over the basic PT-DEMUX:
SDI data going into the PT-FSDMX-IBG no longer has to be of a common data-rate in order to be
processed (de-embedding audio data from the SDI streams and sending processed Audio data via
TDM to the Audio crosspoint). A mix of SD, HD, and 3G operation between channels of matching
frame rate is supported.
De-embedded PCM Audio of all SDI channels, regardless of their frame and data rate is sample-rate-
converted into a common downstream Audio clock domain (locked to Video Reference) and can be
processed (Gain, Mute, Invert, Sum, Swap) before the Audio channels get combined into a single
128 channel TDM stream.
