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PM-ADCT-IB/PT-ADCT-IB: Audio A/D Input Modules with TDM
Capability
Operation
Note: PM- series modules operate in 5RU and 9RU frames only. PT- series modules operate
in 5RU, 9RU, 15RU, and 28RU frames.
Figure 3-26 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.
Platinum Frames and Modules
Installation, Configuration, and Operation Manual
113
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