Rane | AVA 22 | Data Sheet | Rane AVA 22 Audio / Video Delay Data Sheet

Rane AVA 22 Audio / Video Delay Data Sheet
DATA SHEET
AVA 22
AUDIO/VIDEO ALIGNMENT DELAY
8.0
9.5
General Description
The Rane AVA 22 Audio/Video Alignment Delay is a
fully balanced two Input, two Output audio alignment delay
providing a range of 0.0 to 9.5 NTSC frames (8.0 PAL/
SECAM frames) on each Output. The Delay of each Output is
independently adjustable in field (half-frame) increments.
Each Output has two nonvolatile Memories, A and B, for easy
access to previously stored Delay values.
The AVA 22 features XLR connectors. Remote terminals
on the rear accept external configuration switches, permitting
independent stereo bypassing and stereo remote recall of
Memories. An internal jumper is provided to reconfigure the
Remote terminals for independent recall of the two Channels’
stored Memories.
Housed in a single rack space the AVA 22 can be operated as two independent Channels (dual mono) or as a stereo
pair of Channels (LINK mode).
The AVA 22 employs the Dolby™ Time Link 1-bit deltasigma encode/decode circuit; the same circuit used in many
Dolby surround sound decoding units for home theater
systems. This ensures the highest possible audio quality
throughout the system.
Both NTSC and PAL/SECAM broadcast standards are
supported.
A recessed rear panel switch is available for locking out
front panel controls. In this mode, all of the front panel
pushbuttons are disabled with the exception of the Recall
buttons. The Recall buttons remain active so the user may
view the stored Delay values without risk of changing them.
Internal jumpers enable or disable Bypass while in Front
Panel Lockout mode. The default setting of these jumpers
disables Bypass in Front Panel Lockout mode.
Independent bypass relays provide a fail safe, hard-wired
bypass in case of power loss.
The AVA 22 is a unity gain device with Sensitivity
adjustment controls to provide proper internal levels for the
Dolby™ Time Link circuit. If the input signal is nominally
+4 dBu, set the Sensitivity control fully counter-clockwise
(+4 dBu). For those unable to touch a cable and determine its
signal level, Signal present and Clip LEDs provide visual
indication that the Input signal is within optimal range.
Powered from a low voltage UL listed, CSA certified
remote power supply (230 VAC model meets LVD 73/23/
EEC), the AVA 22 is exempt from safety agency requirements, and may be used in any installation mandating agency
compliance.
Dolby and the double-D symbol are trademarks of Dolby
Laboratories Licensing Corporation.
Features
•
•
•
•
•
•
1-Bit Dolby™ Time Link Conversion
Two Independent Channels (2 In - 2 Out)
0 to 9.5 NTSC Frames Delay Range per Channel
0 to 8.0 PAL/SECAM Frames Delay Range per Channel
Single Field (Half-Frame) Increments
Front Panel Lockout Switch on Rear
•
•
•
•
•
•
Independent Remote Memory Recall Interface on Rear
Active Balanced XLR Inputs & Outputs
Two EEPROM Memories per Channel (No Batteries)
Fail-Safe Bypass for Each Channel
UL/CSA Remote Power Supply (120 VAC)
CE (Low Voltage & EMC) Remote Power Supply (230 VAC)
Data Sheet-1
Parameter
Delay Range NTSC
..........PAL/SECAM
..........Increment Size
..........Readout
Propagation Delay
Sampling Frequency
Data Convertion
Input & Output Connectors
Inputs: Type
..........Impedance
..........Headroom
..........Max Nominal Level
Outputs: Type
..........Impedance
..........Max Voltage Level
..........Nominal Output Power
Overall System Gain
Output Relays
LED Threshold - Clip
LED Threshold - Signal
Present
Frequency Response
THD + Noise
Signal-to-Noise Ratio
Dynamic Range
Crosstalk
Power Supply Requirement
Maximum Current Demand
Unit: Agency Listing
..........120 VAC model
..........230 VAC model
EMI/RFI Emission Level
Power Supply: Agency Listing
..........120 VAC model
..........230 VAC model
..........100 VAC model
Unit: Construction
..........Size
..........Weight
Shipping: Size
.........Weight
Note: 0 dBu = 0.775 Vrms
Data Sheet-2
Specification
0.0 to 9.5
0.0 to 8
1 Field (½ Frame)
2 digit LED
11.3
3.2 MHz
1-bit Dolby™ Time Link
XLR
Active Balanced
20k Balanced
16 above Sensitivity setting
7 above Sensitivity setting
4
Active Balanced
200 Balanced
20 (=>600 ohm load)
12
4
0
2.5
Yes
5 before Converter Overload
Limit
1%
1%
Units Conditions/Comments
frames 33.3 msec/frame (30 frames/sec)
frames 40 msec/frame (25 frames/sec)
0.1
µsec
1%
2
2
ohms
dB
dB
dBu
1%
±1
±1
ohms
dBu
dBu
dBm
dB
dB
1
dB
20 Hz - 8 kHz, Sens@+4 dBu
at 20 kHz, Sens@+4 dBu
600 ohm load
600 ohm load
>2k ohm load
Auto-Bypass with power loss
1 kHz
-37 below Clip LED
1
dB
1 kHz
20-8 kHz
8k-20 kHz
0.1
0.2
92
82
98
90
108
>85 @ 1 kHz, >64 @ 20 kHz
18 VAC w/center tap
650
±0.5
±1.5
.05
.1
2
2
2
2
2
dB
dB
%
%
dB
dB
dB
dB
dB
dB
Vrms
mA
+4 dBu, Sens@+4
+4 dBu, Sens@+4
+4 dBu, Sens@+4, 1 kHz, 30k BW
+4 dBu, Sens@+4, 20-20k, 30k BW
+4 dBu, Sens@+4, CCIR-2k
+4 dBu, Sens@+4, 20-20 kHz
Sens@+4, 20 Hz-8 kHz
Sens@+4, 8k-20 kHz
Sens@+4, 20-20 kHz, CCIR-2k
+4 dBu, Sens@+4
RS 1 (supplied)
RMS current from remote supply
Class 2 Equipment
UL & CSA
CE-EMC
CE-Safety
Certified FCC Part 15J
UL
CSA
CE-EMC
CE-Safety
Built to JIS
All Steel
1.75"H x 19"W x 8.5"D (1U)
6 lb (w/o power supply)
4.5" x 20.3" x 13.75"
10 lb
Instrumentation type
10%
20 Hz-8 kHz
20 kHz
20-8 kHz, Sens@+4 dBu
National Electrical Code
Exempt Class 2 equipment
EMC directive 89/336/EEC
Exempt per Art. 1, LVD 73/23/EEC
Class A Device
Class 2 Equipment
File no. E88261
File no. LR58948
EMC directive 89/336/EEC
LV directive 73/23/EEC
Japan only
(4.4 cm x 48.3 cm x 21.6 cm)
(2.7 kg)
(11.5 cm x 52 cm x 35 cm)
(4.5 kg)
Block Diagram
Application Information
The AVA 22 provides a cost-effective solution to the
problem of aligning audio to video in broadcast. Modern
video processing creates unavoidable time delays between
audio and video signals. Accumulated delays can run as high
as several frames, creating objectionable synchronization
problems. Audio preceding video by even one frame is
detectable by some people. The high cost of existing audio/
video synchronizers prevents many broadcasters from
correcting all synchronization problems adequately. Satellite
links also add to the synchronization problem since the audio
can be transmitted through a separate medium than the video.
The AVA 22’s maximum delay of 9.5 NTSC (8.0 PAL/
SECAM) frames provides these complex systems with a cost
effective delay solution. Rane offers the AVA 22 to answer
the need for a low cost, high quality, audio/video alignment
delay.
The AVA 22 operates as either a dual mono or stereo
device. Link mode provides simple stereo operation, linking
both Channels together with easy one-button editing of both
Channels’ parameters. In dual mono the two Channels are
completely independent allowing simultaneous operation in
two separate mono production rooms. The Remote Recall
terminals can be internally configured allowing the remote
room to independently access the two configuration memories.
The AVA 22 supports both NTSC and PAL/SECAM
broadcast modes. This broadcast Mode is stored in configuration memory with the delay values allowing recall of NTSC
values from one memory and PAL/SECAM values from the
other. Video houses providing NTSC to PAL (and vice versa)
conversion find this feature particularly useful. (Those
working on Godzilla sequels should contact the factory for
special synchronization procedures.)
600 ohm user information
The AVA 22’s inputs are specified for a nominal +4 dBu input, which is a voltage referenced level of 1.228 Volts RMS.
(0 dBu = 0.7746 Volts). At this voltage level, the AVA 22 provides 16 dB of headroom below 8 kHz. Users who wish to operate
the AVA 22 in 600 ohm systems must provide their own 600 ohm input resistor across the input terminals. This enables the
AVA 22 to accept a +4 dBm input and allows delivery of +4 dBm to a 600 ohm load. Confusion among 600 ohm users of the
AVA 22 may occur if one assumes the input and output impedances of the AVA 22 are 600 ohms – they are not. Therefore, when
evaluating the AVA 22 do not assume that +4 dBm equals +4 dBu unless you have ensured that all input and output impedances
in your test setup are 600 ohms.
Advantages of Hi-Z in/Lo-Z out systems:
(from Audio System Design and Installation, by Phillip Giddings, Howard W. Sams, 1990, pp. 129-130.)
Less distortion in output due to smaller output current needs.
About 14 dB lower noise pickup by interconnecting lines due to lower source impedance.
Greater lengths of cable may be driven for a given high frequency roll-off.
Many pieces of equipment can be driven from one output without the use of distribution amplifiers and with no concern for
matching or level changes.
5. Better reliability resulting from less heat generation due to less power drawn from the output stage.
6. In the event that a 600 ohm load termination is used the delivered voltage will only drop by about 1 dB (20 log [R1/(R1+RS)].
7. Greater signal voltage swing as 6 dB of signal is not lost in the (600 ohm) source impedance.
8. Smaller currents reduce inductive coupling and crosstalk between cables.
1.
2.
3.
4.
Data Sheet-3
AVA 22
AUDIO/VIDEO ALIGNMENT DELAY
Rear Panel
Architectural Specifications
The digital audio delay unit shall be a single rack space,
two Input, two Output configuration. The delay adjustment
range shall be from 0.0 to 9.5 NTSC frames (8.0 PAL/
SECAM frames), adjustable via increment/decrement
pushbuttons, in field (half-frame) intervals. The method of
delay shall be the Dolby Time Link 1-bit delta-sigma encode/
decode circuit. Independent remote recall terminals shall be
provided for external stereo bypassing and stereo recall of
stored configuration memories, two per channel. A two (2)
digit LED display shall indicate delay values in frames as well
as software revision level. For each channel, individual LEDs
shall indicate Bypass status, current Memory, broadcast Mode
(NTSC or PAL/SECAM) and overall Link status.
A recessed rear-panel switch shall disable the front panel,
yet still allow viewing of stored delay values.
Independent input-output Sensitivity controls shall be
included to allow calibration of the input signal for maximum
performance. The inputs and outputs shall be active balanced,
terminated with XLR connectors. Each channel shall have
LEDs to indicate Signal present and input/output Clip
conditions.
The unit shall provide independent, fail-safe Bypass
relays requiring no power to engage. RFI filters shall also be
provided.
The unit shall have certified compliance with FCC docket
20780 Part 15J for Class A computing devices, and EMCD
89/336/EEC. The 120 VAC model shall be powered from a
UL listed, CSA certified remote power supply; the 230 VAC
model shall be powered from a remote power supply meeting
LVD 73/23/EEC & EMCD 89/336/EEC standards. The
chassis shall be constructed entirely from cold-rolled steel.
The unit shall be a Rane Corporation AVA 22.
©Rane Corporation 10802 47th Ave. W., Mukilteo WA 98275-5098 TEL (425)355-6000 FAX (425)347-7757 WEB http://www.rane.com
Data Sheet-4
All features & specifications subject to change without notice. DOC 103109 PN 08592 8-98
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