Lexicon 20/20 AD manual Introduction, AES/EBU Interface Professional

20/20 AD User Guide

Introduction

The 20/20 AD is an analog-to-digital converter which can be configured for two 20-bit channels, or four 18-bit channels. Twin on-board signal processors provide 20-bit to 16-bit compression in the digital domain, as well as DC removal and a choice of four dither types.

The compressor allows leeway in setting levels and provides insurance against clipping in the digital domain. In addition, it provides 195 soft compression curves and 13 time constants to allow for more creative functions, such as emulation of tape saturation or analog compression.

This manual provides some basic information on conversion, but assumes the user will be familiar with the principles of analog-to-digital conversion, as well as with the digital audio interface formats output by the 20/20 AD.

Information on specific data which may be required by any target device should be obtained from the manufacturer.

Lexicon has attempted to provide correct information and functional capability corresponding to digital audio standards known and available to us at the time of publication of this document and manufacture of this instrument. As standards evolve, Lexicon may make updates to documentation and/or system software available for purchase.

Lexicon's warranty on this product excludes consequential damages resulting from the use of this product. Local jurisdiction may extend the user additional rights.

AES/EBU Interface (Professional)

The AES/EBU interface conforms to both the AES3-1992 (ANSI S4.40-1992) specification and the EBU document, Tech 3250-E. Both inputs and outputs are balanced, transformer-coupled designs, with a female XLR input and a male XLR output, conforming to the standard convention of IEC 268, Part 12. Input and output levels comply with CCITT V.11. On this device, the professional form of the digital audio and auxiliary data has been labeled "AES" in accordance with general usage.

S/PDIF – Sony/Phillips Digital Interface Format (Consumer)

The S/PDIF interface conforms to the Channel Status Type II format, as specified in the EIAJ CP-340 Digtial Audio Interface Standard, dated September, 1987, and to IEC 958, First Edition 1989-03. As of November 20, 1991, amendments to IEC 958, which include specifications for the implementation of auxiliary data for the consumer format, were under review. Until new specifications are published, this device must conform to currently approved specifications. On this device, the consumer form of the digital audio and auxiliary data has been labeled "SPDIF" in accordance with general usage.