DATA SHEET
General Description
The Rane AVA 22d is a fully balanced two Input, two
Output Audio / Video Alignment Delay providing a range of
0.0 to 9.5 NTSC or PAL/SECAM frames on each Output. 24bit audio converters provide excellent sound quality.
Each Output has two nonvolatile Memories (no batteries
required), A and B, for easy access to previously stored Delay
values. Remote Recall screw terminals on the rear accept
external configuration switches, permitting independent
remote recall of the Memories.
The AVA 22d features XLR Inputs and Outputs, and is
CE certified for emissions. Housed in a single rack space, the
unit can operate as two independent channels (dual mono), or
as a stereo pair (edit both channels simultaneously using Link
Mode).
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
AVA 22d
AUDIO / VIDEO ALIGNMENT DELAY
view the Delay values without risk of changing them. Internal
jumpers are available to 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 22d is a unity gain device with Sensitivity
controls to provide proper internal levels for the audio
converters. 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 indicators provide visual acknowledgment that the Input signal is within optimal range.
Powered from a low voltage UL listed and CSA certified
remote power supply (230 VAC supply meets LVD 73/23/
EEC), the AVA 22d is exempt from safety agency requirements, and may be used in any installation mandating agency
compliance.
Features
• 0 to 9.5 NTSC or PAL/SECAM Frames Delay per Channel
• Two Independent Channels (2 In - 2 Out)
• Single-Field (half-frame) Increments
• Independent Remote Memory Recall Interface on Rear
• Two EEPROM Memories per Channel (No Batteries)
• Front Panel Lockout Switch on Rear
• Fail-Safe Bypass for Each Channel
• Active Balanced XLR Inputs & Outputs
• UL/CSA/CE and 100/120/230 VAC Remote Power Supplies
Data Sheet-1
AVA 22d
AUDIO / VIDEO ALIGNMENT DELAY
Features and Specifications
Parameter Specification Limit Units Conditions/Comments
Delay Range 0.0 to 9.5 1% frames 33.3 msec/frame, NTSC
40 msec/frame, PAL/SECAM
..........Increment Size 1 field (half-frame) frames Independently controllable
..........Readout 2 digit LED
Propagation Delay 1.42 1% msec
Sampling Frequency 50k Hz
Data Conversion 24 bit
Input & Output Connectors XLR
Inputs: Type Active balanced
..........Impedance 25k 1% ohms balanced
..........Headroom 16 above Sensitivity setting 2 dB 20 Hz - 8 kHz
..........Max Level 20 dBu 1 kHz with Sensitivity at +4 dBu
Outputs: Type Active balanced cross-coupled
..........Impedance 200 1% ohms balanced
..........Max Level 22 (>2k ohm); 20 (>600 ohm) dBu 1 kHz with Sensitivity at +4 dBu
Overall System Gain 0 ±1 dB 600 ohm balanced load
Output Relays Yes Auto-bypass with power loss
LED Thresholds: Clip 4 before converter overload 1 dB 1 kHz
..........Signal Present -34 below Clip LED 1 dB 1 kHz
Frequency Response 20 Hz - 20 kHz +0/-0.5 dB +4 dBu, Sens@+4
THD + Noise 0.05 .01 % +4 dBu, Sens@+4, 20-20k, 30k Hz BW
Signal-to-Noise Ratio 85 2 dB +4 dBu, Sens@+4, 20 Hz - 20 kHz
Dynamic Range 101 2 dB +4 dBu, Sens@+4, 20-20k, A-weighted
Crosstalk >90 dB 20-20 kHz, +4 dBu, Sens @ +4 dBu
Unit: Agency Listing
..........120 VAC model Class 2 Equipment National Electrical Code
UL & CSA Exempt Class 2 equipment
..........230 VAC model Certified FCC Part 15J Class B Device
Power Supply: Agency Listing
..........120 VAC model UL File no. E88261
CSA File no. LR58948
..........230 VAC model CE-EMC EMC directive 89/336/EEC
CE-Safety LV directive 73/23/EEC
Power Supply Requirement 18 VAC w/center tap 0.1 Vrms Rane RS 1
..........Maximum Current 650 mA RMS current from remote supply
Unit: Construction All Steel
..........Size 1.75"H x 19"W x 8.5"D (1U) (4.4 cm x 48.3 cm x 21.6 cm)
..........Weight 6 lb (w/o power supply) (2.7 kg)
Shipping: Size 4.25" x 20.3" x 13.75" (11 cm x 52 cm x 35 cm)
.........Weight 10 lb (4.5 kg)
Note: 0 dBu=0.775 Vrms
Data Sheet-2
AVA 22d Block Diagram
CH. 1 SHOWN, CH. 2 IDENTICAL
R
GRCLIPSIGNAL
SIGNAL/CLIP
SENSE
INPUT
2
1
3
Application Information
RFI
FILTER
2 CH MEM RECALL
2 CH BYPASS
GND
0dB
REMOTE
+
-
12dB
SENSITIVITY
LOCKOUT
A/D D/A
CONTROLS
EEPROM
The AVA 22d 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 22d’s maximum delay of 9.5 NTSC or PAL/
SECAM frames provides these complex systems with a cost
effective delay solution with very high quality.
The AVA 22d operates as either a dual mono or stereo
BYPASS
+
+
12dB
-
0dB
-
BYPASS
RELAY
DSP
PROM
AND
DELAYFRONT
MEMORYPANEL
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 22d 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.)
OUTPUT
3
1
2
600 ohm user information
The AVA 22d’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 22d provides 16 dB of headroom below 8 kHz. Users who wish to operate the AVA
22d in 600 ohm systems must provide their own 600 ohm input resistor across the input terminals. This enables the
AVA 22d 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 22d may
occur if one assumes the input and output impedances of the AVA 22d are 600 ohms – they are not. Therefore, when evaluating the AVA
22d 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.)
1. Less distortion in output due to smaller output current needs.
2. About 14 dB lower noise pickup by interconnecting lines due to lower source impedance.
3. Greater lengths of cable may be driven for a given high frequency roll-off.
4. 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.
Data Sheet-3
AVA 22d
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 or PAL/SECAM frames,
adjustable via increment/decrement pushbuttons, in field
(half-frame) increments. Independent remote recall terminals
shall be provided for external stereo bypassing and 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. Bypass status, current
memory, channel, and display modes shall be indicated with
individual indicators.
A recessed rear-panel switch shall disable the front panel,
yet still allow viewing of 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
with XLR connectors. Each channel shall have indicators for
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 B computing devices. The AVA 22d
shall comply with EMCD 89/336/EEC (CE approved). The
120 VAC model shall be powered from a UL listed, CSA
certified remote power supply, and the 230 VAC model shall
be powered from a remote power supply meeting LVD 73/23/
EEC and EMCD 89/336/EEC standards. The unit shall be
constructed entirely from cold-rolled steel.
The unit shall be a Rane Corporation AVA 22d.
©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 103732 PN 10940 1-00
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