Two Channels or One Stream
External
Reference
input
Synchronizer
Option
Ref In
Bus
Bus
Genlock
Adjustment
Sample Rate
Converter
Programmable
Delay
Tracking Delay
Gain
Programmable
Delay
Channel
/
Stream
Router
Dolby E & Non-PCM Path
AES 1 In
AES 2 In
AES 3 In
AES 4 In
Mono/Stereo
Switch
M/S
M/S
M/S
AES 1 Out
AES 2 Out
AES 3 Out
AES 4 Out
Delay
Tracking
Two Channels or One Stream
Two Channels or One Stream
Two Channels or One Stream
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
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
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
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
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
Specifications
Ordering Information
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.
22
8977AP-4B
Digital Audio Processor – Balanced I/O w/Delay
J1
J2
J3
J4
J5
J6
J7
J8
J9
J10
J11
J13
J12
J14
8900BA-R
Audio
Input
Audio Delay
Tracking
Input
Audio
Output
Not Used
Ref Input
Not Used
Pin 3
Pin 2
Pin 1
Pin 1
Pin 2
Pin 3
+
_
G
G
_
+
