Platinum™ IP3
Installation and Operation Manual
Analog/Digital Audio Converter Modules with TDM
© 2016 Imagine Communications Corp.
Proprietary and Confidential.
September 2016 | Page 212
Analog/Digital Audio Converter
Modules with TDM
Audio A/D Input Modules with TDM Capability
(PT-ADCT-IB)
Operation
Figure 94:
PM-ADCT-IB/PT-ADCT-IB Module
The PM-ADCT-IB/
PT-ADCT-IB
audio A/D input module provides analog audio to AES digital audio
conversion within the Platinum routing system. Two optional builds (one option with High Z inputs, the
other with 600
terminated inputs) provide 16 stereo channels of conversion with standard Platinum
I/O module features. This option will provide the user higher conversion capacity (16 stereo channels),
made available via Imagine Communications' TDM (Time Division Multiplexing) architecture.
To reduce idle channel noise in systems using A/D and D/A converters, audio level sensing circuitry is
included that will mute the output (i.e., set all sample data = 0) when the analog input is lost. The level
at which input signal presence is determined is user adjustable, and includes a minimal level which
effectively disables the function. The duration for which this minimum amplitude is maintained before
muting occurs is also user-defined.
The PM-ADCT-IB/
PT-ADCT-IB
can automatically detect an external AES reference signal (DARS), to derive
the required sampling clocks and generate AES streams that are locked in both frequency and phase to
this external reference signal. When this reference signal is absent, the PM-ADCT-IB/
PT-ADCT-IB
generates the necessary sampling clocks at one of several of the most common AES frame rates. Users
will have the ability to adjust these internally generated sampling clock frequencies within a specified
tolerance.
