GRASS VALLEY 8977AP-4B Datasheet

22 8977AP-4B Digital Audio Processor – Balanced I/O w/Delay
Key Features
• Eight independent channels of audio
processing
• Four AES Inputs and four AES outputs
– all balanced
• Auto tracking delay to video synchronizers
• Fixed delay for each channel up to 10s
• Smooth audio handling when adjusting
delay
• Channel routing for PCM signals, stream
routing for Dolby E
• Dolby E programmable delay and routing
• Sample rate conversion accepts 32 kHz,
44.1 kHz, 48 kHz, or 96 kHz and outputs
48 kHz
• Uses local or frame reference for
synchronization
• High density (80 PCM channels per 2 RU
frame)
• Remote control and monitoring via
Ethernet frame interface
Applications
• A companion to the 8985, 8995, and 8981
modules with video synchronization to
provide AES audio handling with tracking
delay
• To route and control PCM channels
combined with Dolby E audio streams
Specifications
Supported Frame Types
GeckoFlex with 8900NET (Net Card) for configuration
Power Rating
6.0 Watts – single slot
Audio I/O
AES: Four inputs, four outputs
Signal type: Balanced AES-3id-1997
Common mode range: Balanced 10 Vp-p DC
500 Hz to 20 kHz
Input sampling rate (FS): 32, 44.1, 48, or 96 kHz
Input resolution: 16-, 20-, or 24-bit
Input return loss: >20 dB (100 kHz – 128 FS)
Output sampling rate: 48 kHz
Output resolution: 20- or 24-bit
Output return loss: >15 dB (100 kHz – 128 FS)
Input impedance: Balanced: 110Ω
Connector type: Balanced: mini-screw terminal block
The 8977AP-4B is a compact, high-
performance, high-density digital audio
processor. It provides processing at channel
level for up to eight PCM audio channels.
It also provides sample-rate conversion
and synchronization for asynchronous and
consumer-type sources. Automatic delay
tracking synchronizes the sound to a video
synchronizer, while a user-configurable delay
can compensate for fixed latency processing.
A particularly powerful feature of the
8977AP-4B is its ability to handle Dolby E
streams. These can be both routed and
delayed while preserving the non-PCM data.
The 8977AP-4B can handle a mix of Dolby E
streams and PCM channels so that, for
example, a Dolby stream on AES input 1 can
be routed to AES output 2 and then replaced
by selected PCM channels on output 1. Audio
input and output connectors are all balanced
(see 8977AP-4U for unbalanced connectors).
PCM audio can be synchronized to a reference;
either a color black video reference, tri-level
syncs, an AES feed, or even word-clock can
be used. Reference can be fed directly to the
module by fitting the optional 8900GEN-SM
Two Channels or One Stream
Programmable
Sample Rate Programmable
AES 1 In
Synchronizer
Converter
Two Channels or One Stream
AES 2 In
Two Channels or One Stream
AES 3 In
Two Channels or One Stream
AES 4 In
Delay
Tracking
Option
External
Genlock
Ref In
Reference
Adjustment
input
Bus Bus
Reference
See 8900GEN-SM genlock submodule
Tracking Input
One wire serial interface (RS-232 type)
Format: 1200 baud
Parity: Even
Bits/word: Seven
Stop bit: One
Connector type: BNC
Electrical Length (delay)
PCM mode: 1.7 ms to 3.9 ms depending on input
sampling rate, typically 3.9 ms at 48 kHz
Non-PCM mode: 280 µs
Sync PCM mode: 280 µs
Pin 3
+
8900BA-R
_
Pin 2
G
Pin 1
Audio
Input
Audio Delay
J11
Tracking
Input
J13
Ref Input
reference input submodule or alternatively
taken from one of GeckoFlex's two internal
busses. This allows several modules in a frame
to share a reference feed, including sharing it
with a video synchronizer.
Dolby E & Non-PCM Path
Delay
Tracking Delay Gain
Channel
Delay
/
Stream
Router
Ordering Information
This module can be mounted in a GeckoFlex
frame but not in other 8900 series frames,
including Gecko-A or Gecko-V frames. As this
module has no card-edge controls, in order to
configure this module, an 8900NET (Net Card)
Network Interface module is required.
8977AP-4B
Audio processor – eight channels – balanced audio
I/O, front and rear module set
8977AP-4U
Audio processor, front and rear – eight channels –
unbalanced audio I/O (see next page)
8900GEN-SM
Reference input submodule
8900-GFA-CBL
Package of four three-terminal to dual BNC cables,
used for unbalanced outputs on 8900A-R modules in a
GeckoFlex frame
For detailed specifications, installation, and setup
instructions see:
www.grassvalley.com/docs/modular
Pin 1
G
_
Pin 2
+
Pin 3
J1
J2
J3
Audio
J4
Output
J5
J6
J7
J8
J9
J10
Not Used
J12
Not Used
J14
Mono/Stereo
AES 1 Out
Switch
AES 2 Out
M/S
AES 3 Out
M/S
AES 4 Out
M/S