Dolby Laboratories UEX/650 Installationsanleitung Handbuch - Seite 13

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impedance compromises the integrity of the bitstream and may create an unreliable

link between pieces of equipment, particularly with long cable runs.

8.3

Multiple Sources: Conversion Between Interface Standards

Although some details of the bitstreams used in the AES and S/PDIF standards are

different, the audio information is exactly the same. As a consequence, most audio

equipment accepts either standard with no need to convert the bitstream itself; this is

the case with the CP650. However, if you intend to connect sources across different

types of digital audio inputs, do not attempt to convert a digital interface type by, for

example, directly wiring an XLR connector to a BNC or RCA plug. This causes an

impedance mismatch and signal reflections, resulting in degradation of the digital

waveform. It may seem to work, but the results are unreliable and dropouts occur.

For conversion between the AES-3id and S/PDIF formats, you can use high-quality

RCA (phono plug)-to-BNC adapters because the cable and impedance are both the

same (75Ω).

For conversion between the AES/EBU and AES-3id or AES/EBU and S/PDIF

formats, a simple and economical method is to use inline transformers. These devices

perform the necessary impedance and balanced/unbalanced conversion. Table 3

shows some examples of suitable adapters. The unbalanced connector in these

examples is a BNC. BNC-to-RCA adapters can be added to connect to consumer

S/PDIF connections. The units listed use passive circuitry.

Table 3 Examples of Available Balanced ↔ Unbalanced Adapters

XLR female 110Ω in

to BNC Female 75Ω out

BNC Female 75Ω in

to male XLR 110Ω out

Higher-priced units incorporating active circuitry are also available. These offer

additional features like multiple inputs, inputs for Toslink digital connections, and

multiple outputs.

Dolby

UEX/650 Upgrade Kit Installation Instructions

Adapter Type

Neutrik

NA-BF

NA-BM

Canare

BCJ-XJ-TRA

BCJ-XP-TRA