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).
PCMaudiocanbesynchronizedtoareference;
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
_
+
