LA Audio CLK - G4 User Manual

 DIGIBOXES

USER GUIDE

December 2003

Rev 1

Digibox Range

Model Page

AES-S3 3 way AES splitter……………………….. 1
AES-D2 2 way AES channel divider……………... 3
AES-SPD AES - S/PDIF converter………………… 5
SPD-S4 4 way S/PDIF splitter …………………… 7
CLK-D4 4 way Word / Super Clock distributor.… 9
CLK-C4 4 way Word / Super Clock converter…..11

CLK-G4 Word / Super Clock generator ………....13

AES-S3 (AES splitter):

Why use an AES/EBU splitter:

Because of the high frequency content of an AES/EBU digital
signal, the connection between a transmitter and receiver needs
to be that of a transmission line. This means the cable must have
a characteristic impedance equal to the output impedance of the
transmitter and the input impedance of the receiver to avoid
reflections on the line. So, one cannot connect an AES output to
several AES inputs without changing the impedance of the line
and creating reflections.
The AES-S3 solves this problem with its ability to drive up to 3
different devices.

Using the AES-S3:

A cable with an impedance of 110 ohms (also called an AES
digital audio cable), must be used especially for long distances
(up to several hundred meters). For short distances < 10 metres,
any good microphone cable should be OK.

AES-S3 block diagram

AES in

High speed

Receiver

High speed

Driver

AES out

1

AES-S3 Connections

Input

One AES/EBU XLR Female

Outputs

Three AES/EBU XLR Male

Specifications

One Transformer balanced input on XLR Female
Input Impedance = 110 Ohms

Three Transformer balanced outputs on XLR Male
Output impedance = 110 Ohms

Sample rate : Up to 96KHz

Jitter : < 1ns

2

AES-D2 (AES/EBU channel divider):

Why use an AES/EBU channel divider:

The AES/EBU digital signal contains two audio channels (left &
right, also called A & B or 1 & 2) on the same transmission line. In
some applications you may need a mono signal. The AES-D2
enables you to extract a mono signal from an AES/EBU stereo
signal (A or B) and send it to two XLR outputs. The AES-D2 also
allows you to select each output to have any combination of input
signal. So it is possible to use the unit as a two way splitter or
reverse the Left and Right of an AES/EBU stereo signal
independently on each output.

Using the AES/EBU AES-D2 :

A cable with an impedance of 110 ohms (also called an AES/EBU
digital audio cable), must be used especially for long distances
(several hundred meters). For short distances < 10 metres any
good microphone cable should be OK.

AES-D2 block diagram

Out

Left (A)

A

AES 1

AES in

High speed

Receiver

Channel
Extractor

Right (A)

B

A

B

Combiner /
High speed

Driver

AES 2

3