Features

Automatic lip sync correction
Single wire control from compatible video processors
Serial control from DD2100 Video Delay Detector
Delay range of 5.14 seconds for obscenity screening
Transparent performance specifications

Description

The AD2100 Stereo Audio Delay/Synchronizer can be used as a variable audio delay for automatic lip sync correction or a fixed audio delay of up to 5.14 seconds (adjustable in 1 mS increments) for obscenity screening, or other audio delay requirements.

Lip sync correction is completely automatic when the delay of the AD2100 is controlled with a control pulse from compatible video frame synchronizers, such as the Pixel Instruments DS4200, VS5200, or VS2100. As the video delay varies, the AD2100 tracks by automatically adjusting the audio delay. If your video processor does not provide a delay control pulse, the Pixel Instruments DD2100 or DD3100 Video Delay Detector can be used to measure the actual video delay and "steer" the AD2100. In addition to the automatically varying delay, a fixed offset can be added to compensate for other external video delays.

When the delay is varying, it is important that audible pitch changes be minimized or eliminated. Using advanced hardware processing and sophisticated software algorithms, the AD2100 delay changes at a controlled rate in 0.1 mS increments, ensuring maximum audio transparency.

In an obscenity screening application, the delay can be set in 1 mS increments up to a maximum of 5.14 seconds (10.28 seconds for monaural signals). Pressing the "Dump" button on the front panel, or a remote "Dump" button causes an instant zero delay, censoring the unwanted audio in memory. After the button is released, the delay is increased at a controlled rate, quickly restoring the original setting.

The front panel of the AD2100 includes an LCD mode/status display, dual bargraph audio level display and gain trim controls for the input and output. Performance specifications are exceptional as a result of the 16 bit linear PCM sampling at 48 kHz. Frequency response is flat from 20 Hz to 22 kHz, noise and distortion are extremely low, and dynamic range is greater than 95 dB.

The audio inputs and outputs use industry standard 3-pin XLRs, and the inputs are automatically bypassed to the outputs with a loss of power. Delay settings and operating mode are stored in non-volatile memory for restoration at power up.

Specifications

Delay Setting
Adjustable from 0 to 5.14 sec in 1 mS increments

Input & A/D Conversion
Connector/Configuration 2 x 3 pin XLR/Balanced
Impedance 20 k/600O, selectable
Maximum input level +27 dBu
Input gain trim 0 to -24 dB
Encoding format 16 bit linear PCM, 48 kHz sample rate
Delta-sigma modulation

D/A Conversion & Output
Connector/Configuration 2 x 3 pin XLR/Balanced
Impedance 10O
Maximum output level +24 dBu into 600O
Output gain trim 0 to -20 dB

Performance
Frequency response < + 0.1 dB - 0.5 dB, 20 Hz to 22 kHz
Dynamic range > 95 dB, 20 Hz to 22 kHz
band limited, unweighted
THD + Noise < .01%, upper 20 dB of dynamic range
SMPTE IM < .01% at +10 dBm input level
Channel separation > 80 dB
Channel phase match < +/- 1o, 20 Hz to 15 kHz
(All measurements made at fixed audio delay)

Control Inputs
Delay Pulse BNC connector accepts a TTL pulse (active high)
to control the offset delay for automatic lip sync correction.
Serial Remote 4 pin telephone jack, communicates with
DD2100
Remote Dump 1/4" stereo jack, closure to ground on tip
activates dump mode.

Front Panel Indicators
Input level Dual LED bar graph
Status and modes 20 x 2 LCD display

Power
AC Input 110-120/220-240 V, 50/60 Hz
Consumption 50 W maximum

Mechanical
Width 19.0" (48.3 cm)
Height 1.75" (4.5 cm)
Depth 19.0" (48.3 cm)
Weight 9.4 lb (4.3 kg)

Environmental
Operating Temperature 0oC to 45oC
Storage Temperature -55oC to +75oC
Humidity 10% to 95%, non-condensing

Patents
Pat. 5,202,761, 4,313,135, RE 33,535 Pat. Pending




Pixel Instruments continuing product development programs may result in changes to specifications and features without notice.