Eventide BD600+ handleiding

Handleiding

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Understanding BD600 Profanity Delay Functions

BD600+Profanity Delay Chapter 2 Operation Page 11

Document Version 2.3

Wordclock Termination

Because a Wordclock signal is a high frequency digital signal, certain steps must be taken to be sure it

is not degraded when it is fed along a cable. These issues become more important for long cables.

1) The characteristic impedance of the cable and connectors should match that of the Wordclock

source. Wordclock cables are usually made with RG-59/U cable which has a characteristic impedance

of 75 ohms. Other cables may be made with RG-58/U “Thin Ethernet” cable which has a 50 ohm im-

pedance. Contact the manufacturer of your Wordclock source to find what impedance should be used –

75 ohm is the most common.

2) The end of the cable furthest from the Wordclock source must be terminated

with a resistance matching the Wordclock source and cable impedance. The

BD600+ has a jumper position inside (JP500, just behind the Wordclock con-

nector) where a jumper may be installed to supply a 75 ohm terminating imped-

ance – this jumper is normally not installed, meaning the input is un-terminated. It

is usually more convenient to use an external BNC T-piece and terminator, avoid-

ing the need to open up the unit to change or check the termination.

With multiple destinations only the one at the end of the cable needs to be termi-

nated – intermediate destinations need not and should not be terminated. These

should be connected by the use of a BNC “T” connector or splitter attached di-

rectly to their inputs so as to ensure the shortest possible stub length. Using mul-

tiple terminations is must be avoided, because (for example) twice 75 Ohm in

parallel gives 37.5 Ohms which is the wrong value for termination and also in-

creases loading on the source.

Understanding BD600 Profanity Delay Functions

This section uses a tape recorder delay as an analogy to describe how the Eventide digital broadcast

delay behaves when used as a profanity delay. The digital broadcast delay can be likened to a tape re-

corder with some new features. A basic tape recorder profanity delay would look like this:

When the delay is placed in line, the microphone (audio source) is connected to the record head while

the transmitter is connected to the play head. This introduces a delay determined by the speed of the

tape and the distance between the tape heads.

In our analogy the speed of the tape is

constant. The distance between the heads

is measured in seconds and there is

enough room between the tape heads for

eight seconds of delay. Factory default

values are used whenever a time or dura-

tion is mentioned – for example, while the

SAFE time is stated as four seconds, it can

be configured to a different value.

The Eventide system offers the following features:

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Bekijk gratis de handleiding van Eventide BD600+, stel vragen en lees de antwoorden op veelvoorkomende problemen, of gebruik onze assistent om sneller informatie in de handleiding te vinden of uitleg te krijgen over specifieke functies.

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