AD122-96 MX
Operations Manual
3
PART I: Introduction
The
Model AD122-96 MX Master Analog to Digital Converter
receives analog input signals at the left
and right analog input channels. The converter can receive balanced or unbalanced analog input signals.
Individual left and right analog gain adjustment can be made via the front panel adjustment pots. Fine
tuning of reference levels can be achieved by setting the front panel bar graph display (LED's) to “Fine”
mode (reference meter bridge). The digital output is available at the AES/EBU output. The AES/EBU
XLR output is compatible with coaxial SPDIF using a simple adapter or adapter cable.
Front panel selection enables setting word length between 16 and 24 bits (NI is a 20 bit setting as per
AES/EBU specifications). Redithering is available for output wordlengths of less than 24 bit using the
available
α
coustic
β
it Correction™
feature. Redithering to smaller words retains much of the acoustic
information in the full word width output.
The converter can operate with internal or external clock synchronization. Available internal crystal
frequencies are 44.1 kHz, 48 kHz, 88.2 kHz, or 96 kHz. For external synchronization, a signal is applied
to either the SYNC/WC XLR input or the Word Clock BNC input. The input types are digital audio
(AES/EBU) or word clock signals. The desired frequency lock range settings are 44.1 kHz narrow lock
range, 48 kHz narrow lock range, 40-50 kHz wide lock range, 88.2 kHz narrow lock range, 96 kHz narrow
lock range, 88/44 kHz, or 96/48 kHz (conversion rate 2X sync rate).
Vernier Transfer Function Correction™:
The exceptional performance of Lavry Engineering’s
AD122-96 MX
is due to design innovations in both
analog and digital sections. The performance of the low-noise high-linearity converter is optimized by a set
of proprietary algorithms utilizing a "digital vernier" technique which provides superior resolution and
correction for changes in circuit parameters, including component drift due to temperature and aging.
Please note that because the difference between the MkIII and MX models did not require changes to
the converter’s software, the MX model will display “Ver 2.1e” ©2000 dB tech, AD122-96MkII” in
the initialization screen of the LCD display.
Additional features:
Improved handling of input clipping: The MX model increases the maximum level that can be utilized
with clipping as a form of dynamic range control, without audible degradation.
Test Tones: a fully programmable digital test tone generator for calibration.
Polarity Inversion: changes polarity of digitized audio signal.
Soft Saturation: emulates analog tape saturation for higher recording levels.
User-Defined Power-Up Default Setting
Stereophonic Bar Graph Display: features wide dynamic range; the bar graph can be extended by 30, 60 or
90dB for viewing the noise floor. The bar graph may also be altered for use as a reference meter bridge.
Clip Indication: when digital full scale indication is enabled, the full scale “MAX” light can be set to hold
until reset by the user.
Format Control: pro or consumer data format. When in consumer mode the user can choose category,
C and L bit settings.
