Grass Valley AAP-1741 - Manual (Page 5)

GUIDE TO INSTALLATION AND OPERATION
AAP-1741 | 1
1 AAP-1741 Four Channel Analog Audio Processor
1.1 Introduction
The AAP-1741 is a four-channel high quality audio processor designed to work alone or with a wide range
of video converters, frame synchronizer proc/amps of the Densité series.
The card features two distinct processing blocks: Input and Output. The input processing includes Dolby
detection, Tone generator, delay adjustments, level controls and phase correction. Delay components
include a fixed delay of up to 2 seconds as well as a video tracking delay that will automatically track the
varying saw tooth delay introduced by an associated video frame synchronizer.
The output processing block includes full channel shuffling, an additional gain/attenuation stage and
mixing. Each odd output channel is a mix of any two input channels, and a 4-channel mixing is available
on the even output channels.
Additional audio functions such as dynamic processing (compressor/limiter and expander) and/or Down
and Up mixing are proposed as options.
With a card-to-card Audio bus, the AAP-1741 provides processing for 8 channels originating from a video
card. Once processed, the signals are sent back to be embedded, and are also available at the analog
outputs.
Along with the audio channels, the Audio bus carries the timing, delay signaling and Dolby Metadata.
When combining cards together all audio processing is synchronous and in phase, ensuring proper
alignment and matched delay. The AAP-1741 can work with one video card and/or one other audio
processor card.
An input audio signal status is also available indicating the input signal presence or overload.
The card is housed in a (DENSITÉ) frame, with a single or double width rear connector panel.
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1.2 Features
• 8 channel processing of embedded audio signals.
• Stand-alone 8 channel audio processor and delay.
• Fixed delay and up to 8 video frames tracking delay
• Full channel shuffling on the outputs
• 2 and 4 channel mix-down
• Audio metering data for audio levels and phase over IP.
• Dolby E compatibility
• Analog audio inputs and outputs
• Full quality 24 bit audio converters
• Balanced AES3 or unbalanced AES3-id I/Os
• -96 to +12 dB of input and output level adjustments (0.5 dB steps)
• Separate input and output 0 dBFS adjustments (0 to +24 dBu, 1 dB steps)
• Locks to video card, frame reference or AES input