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Lavry AD122-96 MX User Manual

Lavry AD122-96 MX
25 pages
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Model AD122-96 MX
Master Analog to Digital
Converter
Operations Manual
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Lavry AD122-96 MX Specifications

General IconGeneral
TypeA/D Converter
Channels2
Sample Rates44.1 kHz, 48 kHz, 88.2 kHz, 96 kHz
Bit Depth24-bit
THD+N< 0.0005%
Input ConnectorsXLR
Output ConnectorsAES/EBU
Power SupplyExternal Power Supply

Summary

Operating Instructions

Push Button Switches

Explains the function of ENTER, GO, EXIT, and CURSOR buttons for unit operation.

Main Screen Operation

Part I: Introduction

Improved Input Clipping Handling

Enhances maximum usable signal level for dynamic range control without audible degradation.

Word Length and Acoustic Bit Correction

Setting Output Word Length

Selecting digital output word length from 16 to 24 bits, with recommended 22-24 bits.

Acoustic Bit Correction™ Explained

Feature for reducing distortion and noise modulation using dither and noise shaping.

Audio Control Screen

DC Offset Removal Procedure

Procedure for removing DC offset from the audio signal for normal operation.

Bar-Graph & Display Screen

Warm-up and Calibration Procedures

Hardware Interconnections

Part II: Specifications

Analog Input Specifications

Details on signal amplification, input impedance, and noise floor at different sampling rates.

Total Harmonic Distortion and Noise

Measured THD+N values for different signal levels with balanced inputs.

Appendix I: Acoustic Bit Correction

Dithering and Noise Shaping Concepts

Explanation of how dithering eliminates distortion and noise shaping shifts noise psychoacoustically.

Dither Explanation Details

Detailed explanation of dither concepts and their impact on signal quality.

Noise Shaping Curve Selection Guidance

Guidance on selecting noise shaping curves based on listening tests and material.

Dither vs. Truncation Distortion Analysis

Compares effects of dither and truncation on signal quality with examples.

16-bit Signal Dithering Analysis

Analysis of applying dither to 16-bit signals and the resulting distortion.

Noise-Shaping Curves Comparison

Compares Flat dither with NS2, NS3, NS4 shaping curves and their aggressiveness.

Appendix II: Input Considerations

Analog Signal Linearity Demands

Importance of analog signal linearity for achieving high resolution A/D conversion.

Noise in Analog Signals

How analog noise and quantization interact to affect sonic detail.

Analog Input Interconnection Methods

Discusses four methods for connecting analog input signals.

Appendix III: Soft Saturation

Soft Saturation Feature Overview

Digital emulation of ideal magnetic tape saturation characteristic with three settings.

Soft Saturation Transfer Functions

Graph showing input versus output values for OFF, +3dB, and +6dB soft saturation settings.

Soft Saturation Algorithm Operation

How the algorithm works sample-by-sample, amplifying below threshold and compressing above.

Soft Saturation Time Domain Plots

Plots showing signal transformation for +3dB and +6dB settings, detailing gain and distortion tradeoffs.

Soft Limiter Advantages Over Analog

Advantages of the digital soft saturation over conventional analog limiters.

Linearity and Distortion Compromise

How linearity is maintained up to specific thresholds for +3dB and +6dB settings.

Appendix IV: Viewing Noise Floor

Measuring Noise Floor with Bar Graph

Step-by-step guide to estimate noise floor using the bar graph display and peak readings.

Noise Floor Measurement Steps

Specific steps for setting up the unit and reading the bar graph for noise floor measurement.